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doc: format the documentation (#57102)

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7
doc/.gitignore vendored
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@ -1,7 +1,8 @@
*.chapter.xml
*.section.xml
.version
out
manual-full.xml
highlightjs
functions/library/generated
functions/library/locations.xml
highlightjs
manual-full.xml
out

92
doc/coding-conventions.xml
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@ -197,20 +197,14 @@ args.stdenv.mkDerivation (args // {
<title>Package naming</title>
<para>
The key words
<emphasis>must</emphasis>,
<emphasis>must not</emphasis>,
<emphasis>required</emphasis>,
<emphasis>shall</emphasis>,
<emphasis>shall not</emphasis>,
<emphasis>should</emphasis>,
<emphasis>should not</emphasis>,
<emphasis>recommended</emphasis>,
<emphasis>may</emphasis>,
and <emphasis>optional</emphasis> in this section
are to be interpreted as described in
<link xlink:href="https://tools.ietf.org/html/rfc2119">RFC 2119</link>.
Only <emphasis>emphasized</emphasis> words are to be interpreted in this way.
The key words <emphasis>must</emphasis>, <emphasis>must not</emphasis>,
<emphasis>required</emphasis>, <emphasis>shall</emphasis>, <emphasis>shall
not</emphasis>, <emphasis>should</emphasis>, <emphasis>should
not</emphasis>, <emphasis>recommended</emphasis>, <emphasis>may</emphasis>,
and <emphasis>optional</emphasis> in this section are to be interpreted as
described in <link xlink:href="https://tools.ietf.org/html/rfc2119">RFC
2119</link>. Only <emphasis>emphasized</emphasis> words are to be
interpreted in this way.
</para>
<para>
@ -253,8 +247,8 @@ args.stdenv.mkDerivation (args // {
<itemizedlist>
<listitem>
<para>
The <literal>name</literal> attribute <emphasis>should</emphasis>
be identical to the upstream package name.
The <literal>name</literal> attribute <emphasis>should</emphasis> be
identical to the upstream package name.
</para>
</listitem>
<listitem>
@ -275,28 +269,29 @@ args.stdenv.mkDerivation (args // {
<para>
If a package is not a release but a commit from a repository, then the
version part of the name <emphasis>must</emphasis> be the date of that
(fetched) commit. The date <emphasis>must</emphasis> be in <literal>"YYYY-MM-DD"</literal>
format. Also append <literal>"unstable"</literal> to the name - e.g.,
(fetched) commit. The date <emphasis>must</emphasis> be in
<literal>"YYYY-MM-DD"</literal> format. Also append
<literal>"unstable"</literal> to the name - e.g.,
<literal>"pkgname-unstable-2014-09-23"</literal>.
</para>
</listitem>
<listitem>
<para>
Dashes in the package name <emphasis>should</emphasis> be preserved in new variable names,
rather than converted to underscores or camel cased — e.g.,
<varname>http-parser</varname> instead of <varname>http_parser</varname>
or <varname>httpParser</varname>. The hyphenated style is preferred in
all three package names.
Dashes in the package name <emphasis>should</emphasis> be preserved in
new variable names, rather than converted to underscores or camel cased
— e.g., <varname>http-parser</varname> instead of
<varname>http_parser</varname> or <varname>httpParser</varname>. The
hyphenated style is preferred in all three package names.
</para>
</listitem>
<listitem>
<para>
If there are multiple versions of a package, this <emphasis>should</emphasis> be reflected in
the variable names in <filename>all-packages.nix</filename>, e.g.
<varname>json-c-0-9</varname> and <varname>json-c-0-11</varname>. If
there is an obvious “default” version, make an attribute like
<literal>json-c = json-c-0-9;</literal>. See also
<xref linkend="sec-versioning" />
If there are multiple versions of a package, this
<emphasis>should</emphasis> be reflected in the variable names in
<filename>all-packages.nix</filename>, e.g. <varname>json-c-0-9</varname>
and <varname>json-c-0-11</varname>. If there is an obvious “default”
version, make an attribute like <literal>json-c = json-c-0-9;</literal>.
See also <xref linkend="sec-versioning" />
</para>
</listitem>
</itemizedlist>
@ -814,8 +809,8 @@ args.stdenv.mkDerivation (args // {
<para>
There are multiple ways to fetch a package source in nixpkgs. The general
guideline is that you should package reproducible sources with a high degree of
availability. Right now there is only one fetcher which has mirroring
guideline is that you should package reproducible sources with a high degree
of availability. Right now there is only one fetcher which has mirroring
support and that is <literal>fetchurl</literal>. Note that you should also
prefer protocols which have a corresponding proxy environment variable.
</para>
@ -869,8 +864,10 @@ src = fetchFromGitHub {
}
</programlisting>
Find the value to put as <literal>sha256</literal> by running
<literal>nix run -f '&lt;nixpkgs&gt;' nix-prefetch-github -c nix-prefetch-github --rev 1f795f9f44607cc5bec70d1300150bfefcef2aae NixOS nix</literal>
or <literal>nix-prefetch-url --unpack https://github.com/NixOS/nix/archive/1f795f9f44607cc5bec70d1300150bfefcef2aae.tar.gz</literal>.
<literal>nix run -f '&lt;nixpkgs&gt;' nix-prefetch-github -c
nix-prefetch-github --rev 1f795f9f44607cc5bec70d1300150bfefcef2aae NixOS
nix</literal> or <literal>nix-prefetch-url --unpack
https://github.com/NixOS/nix/archive/1f795f9f44607cc5bec70d1300150bfefcef2aae.tar.gz</literal>.
</para>
</listitem>
</itemizedlist>
@ -953,17 +950,23 @@ $ nix-hash --type sha256 --to-base32 <replaceable>HASH</replaceable>
would be replace hash with a fake one and rebuild. Nix build will fail and
error message will contain desired hash.
</para>
<warning><para>This method has security problems. Check below for details.</para></warning>
<warning>
<para>
This method has security problems. Check below for details.
</para>
</warning>
</listitem>
</orderedlist>
<section xml:id="sec-source-hashes-security">
<title>Obtaining hashes securely</title>
<para>
Let's say Man-in-the-Middle (MITM) sits close to your network. Then instead of fetching
source you can fetch malware, and instead of source hash you get hash of malware. Here are
security considerations for this scenario:
Let's say Man-in-the-Middle (MITM) sits close to your network. Then instead
of fetching source you can fetch malware, and instead of source hash you
get hash of malware. Here are security considerations for this scenario:
</para>
<itemizedlist>
<listitem>
<para>
@ -972,7 +975,8 @@ $ nix-hash --type sha256 --to-base32 <replaceable>HASH</replaceable>
</listitem>
<listitem>
<para>
hashes from upstream (in method 3) should be obtained via secure protocol;
hashes from upstream (in method 3) should be obtained via secure
protocol;
</para>
</listitem>
<listitem>
@ -982,12 +986,12 @@ $ nix-hash --type sha256 --to-base32 <replaceable>HASH</replaceable>
</listitem>
<listitem>
<para>
<literal>https://</literal> URLs are not secure in method 5. When obtaining hashes
with fake hash method, TLS checks are disabled. So
refetch source hash from several different networks to exclude MITM scenario.
Alternatively, use fake hash method to make Nix error, but instead of extracting
hash from error, extract <literal>https://</literal> URL and prefetch it
with method 1.
<literal>https://</literal> URLs are not secure in method 5. When
obtaining hashes with fake hash method, TLS checks are disabled. So
refetch source hash from several different networks to exclude MITM
scenario. Alternatively, use fake hash method to make Nix error, but
instead of extracting hash from error, extract
<literal>https://</literal> URL and prefetch it with method 1.
</para>
</listitem>
</itemizedlist>

19
doc/configuration.xml
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@ -132,13 +132,13 @@
</itemizedlist>
<para>
The difference between a package being unsupported on some system and
being broken is admittedly a bit fuzzy. If a program
<emphasis>ought</emphasis> to work on a certain platform, but doesn't, the
platform should be included in <literal>meta.platforms</literal>, but marked
as broken with e.g. <literal>meta.broken =
!hostPlatform.isWindows</literal>. Of course, this begs the question of what
"ought" means exactly. That is left to the package maintainer.
The difference between a package being unsupported on some system and being
broken is admittedly a bit fuzzy. If a program <emphasis>ought</emphasis> to
work on a certain platform, but doesn't, the platform should be included in
<literal>meta.platforms</literal>, but marked as broken with e.g.
<literal>meta.broken = !hostPlatform.isWindows</literal>. Of course, this
begs the question of what "ought" means exactly. That is left to the package
maintainer.
</para>
</section>
<section xml:id="sec-allow-unfree">
@ -175,9 +175,8 @@
</programlisting>
</para>
<para>
For a more useful example, try the following. This configuration
only allows unfree packages named flash player and visual studio
code:
For a more useful example, try the following. This configuration only
allows unfree packages named flash player and visual studio code:
<programlisting>
{
allowUnfreePredicate = (pkg: builtins.elem

144
doc/cross-compilation.xml
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@ -6,17 +6,17 @@
<title>Introduction</title>
<para>
"Cross-compilation" means compiling a program on one machine for another type
of machine. For example, a typical use of cross-compilation is to compile
programs for embedded devices. These devices often don't have the computing
power and memory to compile their own programs. One might think that
cross-compilation is a fairly niche concern. However, there are significant
advantages to rigorously distinguishing between build-time and run-time
environments! This applies even when one is developing and deploying on the
same machine. Nixpkgs is increasingly adopting the opinion that packages
should be written with cross-compilation in mind, and nixpkgs should evaluate
in a similar way (by minimizing cross-compilation-specific special cases)
whether or not one is cross-compiling.
"Cross-compilation" means compiling a program on one machine for another
type of machine. For example, a typical use of cross-compilation is to
compile programs for embedded devices. These devices often don't have the
computing power and memory to compile their own programs. One might think
that cross-compilation is a fairly niche concern. However, there are
significant advantages to rigorously distinguishing between build-time and
run-time environments! This applies even when one is developing and
deploying on the same machine. Nixpkgs is increasingly adopting the opinion
that packages should be written with cross-compilation in mind, and nixpkgs
should evaluate in a similar way (by minimizing cross-compilation-specific
special cases) whether or not one is cross-compiling.
</para>
<para>
@ -34,7 +34,8 @@
<title>Platform parameters</title>
<para>
Nixpkgs follows the <link
Nixpkgs follows the
<link
xlink:href="https://gcc.gnu.org/onlinedocs/gccint/Configure-Terms.html">conventions
of GNU autoconf</link>. We distinguish between 3 types of platforms when
building a derivation: <wordasword>build</wordasword>,
@ -95,10 +96,10 @@
The build process of certain compilers is written in such a way that the
compiler resulting from a single build can itself only produce binaries
for a single platform. The task of specifying this single "target
platform" is thus pushed to build time of the compiler. The root cause of
this is that the compiler (which will be run on the host) and the standard
library/runtime (which will be run on the target) are built by a single
build process.
platform" is thus pushed to build time of the compiler. The root cause
of this is that the compiler (which will be run on the host) and the
standard library/runtime (which will be run on the target) are built by
a single build process.
</para>
<para>
There is no fundamental need to think about a single target ahead of
@ -136,9 +137,9 @@
This is a two-component shorthand for the platform. Examples of this
would be "x86_64-darwin" and "i686-linux"; see
<literal>lib.systems.doubles</literal> for more. The first component
corresponds to the CPU architecture of the platform and the second to the
operating system of the platform (<literal>[cpu]-[os]</literal>). This
format has built-in support in Nix, such as the
corresponds to the CPU architecture of the platform and the second to
the operating system of the platform (<literal>[cpu]-[os]</literal>).
This format has built-in support in Nix, such as the
<varname>builtins.currentSystem</varname> impure string.
</para>
</listitem>
@ -149,14 +150,14 @@
</term>
<listitem>
<para>
This is a 3- or 4- component shorthand for the platform. Examples of this
would be <literal>x86_64-unknown-linux-gnu</literal> and
This is a 3- or 4- component shorthand for the platform. Examples of
this would be <literal>x86_64-unknown-linux-gnu</literal> and
<literal>aarch64-apple-darwin14</literal>. This is a standard format
called the "LLVM target triple", as they are pioneered by LLVM. In the
4-part form, this corresponds to
<literal>[cpu]-[vendor]-[os]-[abi]</literal>. This format is strictly
more informative than the "Nix host double", as the previous format could
analogously be termed. This needs a better name than
more informative than the "Nix host double", as the previous format
could analogously be termed. This needs a better name than
<varname>config</varname>!
</para>
</listitem>
@ -167,11 +168,10 @@
</term>
<listitem>
<para>
This is a Nix representation of a parsed LLVM target triple
with white-listed components. This can be specified directly,
or actually parsed from the <varname>config</varname>. See
<literal>lib.systems.parse</literal> for the exact
representation.
This is a Nix representation of a parsed LLVM target triple with
white-listed components. This can be specified directly, or actually
parsed from the <varname>config</varname>. See
<literal>lib.systems.parse</literal> for the exact representation.
</para>
</listitem>
</varlistentry>
@ -253,15 +253,15 @@
<para>
Some examples will make this clearer. If a package is being built with a
<literal>(build, host, target)</literal> platform triple of <literal>(foo,
bar, bar)</literal>, then its build-time dependencies would have a triple of
<literal>(foo, foo, bar)</literal>, and <emphasis>those packages'</emphasis>
build-time dependencies would have a triple of <literal>(foo, foo,
foo)</literal>. In other words, it should take two "rounds" of following
build-time dependency edges before one reaches a fixed point where, by the
sliding window principle, the platform triple no longer changes. Indeed,
this happens with cross-compilation, where only rounds of native
dependencies starting with the second necessarily coincide with native
packages.
bar, bar)</literal>, then its build-time dependencies would have a triple
of <literal>(foo, foo, bar)</literal>, and <emphasis>those
packages'</emphasis> build-time dependencies would have a triple of
<literal>(foo, foo, foo)</literal>. In other words, it should take two
"rounds" of following build-time dependency edges before one reaches a
fixed point where, by the sliding window principle, the platform triple no
longer changes. Indeed, this happens with cross-compilation, where only
rounds of native dependencies starting with the second necessarily coincide
with native packages.
</para>
<note>
@ -273,23 +273,24 @@
</note>
<para>
How does this work in practice? Nixpkgs is now structured so that build-time
dependencies are taken from <varname>buildPackages</varname>, whereas
run-time dependencies are taken from the top level attribute set. For
example, <varname>buildPackages.gcc</varname> should be used at build-time,
while <varname>gcc</varname> should be used at run-time. Now, for most of
Nixpkgs's history, there was no <varname>buildPackages</varname>, and most
packages have not been refactored to use it explicitly. Instead, one can use
the six (<emphasis>gasp</emphasis>) attributes used for specifying
dependencies as documented in <xref linkend="ssec-stdenv-dependencies"/>. We
"splice" together the run-time and build-time package sets with
<varname>callPackage</varname>, and then <varname>mkDerivation</varname> for
each of four attributes pulls the right derivation out. This splicing can be
skipped when not cross-compiling as the package sets are the same, but is a
bit slow for cross-compiling. Because of this, a best-of-both-worlds
solution is in the works with no splicing or explicit access of
<varname>buildPackages</varname> needed. For now, feel free to use either
method.
How does this work in practice? Nixpkgs is now structured so that
build-time dependencies are taken from <varname>buildPackages</varname>,
whereas run-time dependencies are taken from the top level attribute set.
For example, <varname>buildPackages.gcc</varname> should be used at
build-time, while <varname>gcc</varname> should be used at run-time. Now,
for most of Nixpkgs's history, there was no
<varname>buildPackages</varname>, and most packages have not been
refactored to use it explicitly. Instead, one can use the six
(<emphasis>gasp</emphasis>) attributes used for specifying dependencies as
documented in <xref linkend="ssec-stdenv-dependencies"/>. We "splice"
together the run-time and build-time package sets with
<varname>callPackage</varname>, and then <varname>mkDerivation</varname>
for each of four attributes pulls the right derivation out. This splicing
can be skipped when not cross-compiling as the package sets are the same,
but is a bit slow for cross-compiling. Because of this, a
best-of-both-worlds solution is in the works with no splicing or explicit
access of <varname>buildPackages</varname> needed. For now, feel free to
use either method.
</para>
<note>
@ -311,8 +312,8 @@
should be answered here. Ideally, the information above is exhaustive, so
this section cannot provide any new information, but it is ludicrous and
cruel to expect everyone to spend effort working through the interaction of
many features just to figure out the same answer to the same common problem.
Feel free to add to this list!
many features just to figure out the same answer to the same common
problem. Feel free to add to this list!
</para>
<qandaset>
@ -434,14 +435,15 @@ nix-build &lt;nixpkgs&gt; --arg crossSystem '{ config = "&lt;arch&gt;-&lt;os&gt;
build plan or package set. A simple "build vs deploy" dichotomy is adequate:
the sliding window principle described in the previous section shows how to
interpolate between the these two "end points" to get the 3 platform triple
for each bootstrapping stage. That means for any package a given package set,
even those not bound on the top level but only reachable via dependencies or
<varname>buildPackages</varname>, the three platforms will be defined as one
of <varname>localSystem</varname> or <varname>crossSystem</varname>, with the
former replacing the latter as one traverses build-time dependencies. A last
simple difference is that <varname>crossSystem</varname> should be null when
one doesn't want to cross-compile, while the <varname>*Platform</varname>s
are always non-null. <varname>localSystem</varname> is always non-null.
for each bootstrapping stage. That means for any package a given package
set, even those not bound on the top level but only reachable via
dependencies or <varname>buildPackages</varname>, the three platforms will
be defined as one of <varname>localSystem</varname> or
<varname>crossSystem</varname>, with the former replacing the latter as one
traverses build-time dependencies. A last simple difference is that
<varname>crossSystem</varname> should be null when one doesn't want to
cross-compile, while the <varname>*Platform</varname>s are always non-null.
<varname>localSystem</varname> is always non-null.
</para>
</section>
<!--============================================================-->
@ -455,13 +457,13 @@ nix-build &lt;nixpkgs&gt; --arg crossSystem '{ config = "&lt;arch&gt;-&lt;os&gt;
<note>
<para>
If one explores Nixpkgs, they will see derivations with names like
<literal>gccCross</literal>. Such <literal>*Cross</literal> derivations is a
holdover from before we properly distinguished between the host and target
platforms—the derivation with "Cross" in the name covered the <literal>build
= host != target</literal> case, while the other covered the <literal>host =
target</literal>, with build platform the same or not based on whether one
was using its <literal>.nativeDrv</literal> or <literal>.crossDrv</literal>.
This ugliness will disappear soon.
<literal>gccCross</literal>. Such <literal>*Cross</literal> derivations is
a holdover from before we properly distinguished between the host and
target platforms—the derivation with "Cross" in the name covered the
<literal>build = host != target</literal> case, while the other covered the
<literal>host = target</literal>, with build platform the same or not based
on whether one was using its <literal>.nativeDrv</literal> or
<literal>.crossDrv</literal>. This ugliness will disappear soon.
</para>
</note>
</section>

45
doc/functions/appimagetools.xml
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@ -5,11 +5,11 @@
<title>pkgs.appimageTools</title>
<para>
<varname>pkgs.appimageTools</varname> is a set of functions for extracting and wrapping
<link xlink:href="https://appimage.org/">AppImage</link> files.
They are meant to be used if traditional packaging from source is infeasible, or it would take too long.
To quickly run an AppImage file, <literal>pkgs.appimage-run</literal> can be used as well.
<varname>pkgs.appimageTools</varname> is a set of functions for extracting
and wrapping <link xlink:href="https://appimage.org/">AppImage</link> files.
They are meant to be used if traditional packaging from source is infeasible,
or it would take too long. To quickly run an AppImage file,
<literal>pkgs.appimage-run</literal> can be used as well.
</para>
<warning>
@ -19,13 +19,13 @@
</para>
</warning>
<section xml:id="ssec-pkgs-appimageTools-formats">
<title>AppImage formats</title>
<para>
There are different formats for AppImages, see
<link xlink:href="https://github.com/AppImage/AppImageSpec/blob/74ad9ca2f94bf864a4a0dac1f369dd4f00bd1c28/draft.md#image-format">the specification</link> for details.
<link xlink:href="https://github.com/AppImage/AppImageSpec/blob/74ad9ca2f94bf864a4a0dac1f369dd4f00bd1c28/draft.md#image-format">the
specification</link> for details.
</para>
<itemizedlist>
@ -34,7 +34,6 @@
Type 1 images are ISO 9660 files that are also ELF executables.
</para>
</listitem>
<listitem>
<para>
Type 2 images are ELF executables with an appended filesystem.
@ -46,7 +45,7 @@
They can be told apart with <command>file -k</command>:
</para>
<screen>
<screen>
<prompt>$ </prompt>file -k type1.AppImage
type1.AppImage: ELF 64-bit LSB executable, x86-64, version 1 (SYSV) ISO 9660 CD-ROM filesystem data 'AppImage' (Lepton 3.x), scale 0-0,
spot sensor temperature 0.000000, unit celsius, color scheme 0, calibration: offset 0.000000, slope 0.000000, dynamically linked, interpreter /lib64/ld-linux-x86-64.so.2, for GNU/Linux 2.6.18, BuildID[sha1]=d629f6099d2344ad82818172add1d38c5e11bc6d, stripped\012- data
@ -56,7 +55,8 @@ type2.AppImage: ELF 64-bit LSB executable, x86-64, version 1 (SYSV) (Lepton 3.x)
</screen>
<para>
Note how the type 1 AppImage is described as an <literal>ISO 9660 CD-ROM filesystem</literal>, and the type 2 AppImage is not.
Note how the type 1 AppImage is described as an <literal>ISO 9660 CD-ROM
filesystem</literal>, and the type 2 AppImage is not.
</para>
</section>
@ -68,8 +68,7 @@ type2.AppImage: ELF 64-bit LSB executable, x86-64, version 1 (SYSV) (Lepton 3.x)
<varname>wrapType1</varname> or <varname>wrapType2</varname>.
</para>
<programlisting>
<programlisting>
appimageTools.wrapType2 { # or wrapType1
name = "patchwork"; <co xml:id='ex-appimageTools-wrapping-1' />
src = fetchurl { <co xml:id='ex-appimageTools-wrapping-2' />
@ -79,7 +78,6 @@ appimageTools.wrapType2 { # or wrapType1
extraPkgs = pkgs: with pkgs; [ ]; <co xml:id='ex-appimageTools-wrapping-3' />
}</programlisting>
<calloutlist>
<callout arearefs='ex-appimageTools-wrapping-1'>
<para>
@ -93,29 +91,28 @@ appimageTools.wrapType2 { # or wrapType1
</callout>
<callout arearefs='ex-appimageTools-wrapping-2'>
<para>
<varname>extraPkgs</varname> allows you to pass a function to include additional packages
inside the FHS environment your AppImage is going to run in.
There are a few ways to learn which dependencies an application needs:
<varname>extraPkgs</varname> allows you to pass a function to include
additional packages inside the FHS environment your AppImage is going to
run in. There are a few ways to learn which dependencies an application
needs:
<itemizedlist>
<listitem>
<para>
Looking through the extracted AppImage files, reading its scripts and running <command>patchelf</command> and <command>ldd</command> on its executables.
This can also be done in <command>appimage-run</command>, by setting <command>APPIMAGE_DEBUG_EXEC=bash</command>.
Looking through the extracted AppImage files, reading its scripts and
running <command>patchelf</command> and <command>ldd</command> on its
executables. This can also be done in <command>appimage-run</command>,
by setting <command>APPIMAGE_DEBUG_EXEC=bash</command>.
</para>
</listitem>
<listitem>
<para>
Running <command>strace -vfefile</command> on the wrapped executable, looking for libraries that can't be found.
Running <command>strace -vfefile</command> on the wrapped executable,
looking for libraries that can't be found.
</para>
</listitem>
</itemizedlist>
</para>
</callout>
</calloutlist>
</section>
</section>

24
doc/functions/dockertools.xml
View File

@ -24,9 +24,9 @@
<para>
This function is analogous to the <command>docker build</command> command,
in that it can be used to build a Docker-compatible repository tarball containing
a single image with one or multiple layers. As such, the result is suitable
for being loaded in Docker with <command>docker load</command>.
in that it can be used to build a Docker-compatible repository tarball
containing a single image with one or multiple layers. As such, the result
is suitable for being loaded in Docker with <command>docker load</command>.
</para>
<para>
@ -190,8 +190,8 @@ buildImage {
By default <function>buildImage</function> will use a static date of one
second past the UNIX Epoch. This allows <function>buildImage</function> to
produce binary reproducible images. When listing images with
<command>docker images</command>, the newly created images will be
listed like this:
<command>docker images</command>, the newly created images will be listed
like this:
</para>
<screen><![CDATA[
$ docker images
@ -402,9 +402,9 @@ pkgs.dockerTools.buildLayeredImage {
<para>
This function is analogous to the <command>docker pull</command> command, in
that it can be used to pull a Docker image from a Docker registry. By default
<link xlink:href="https://hub.docker.com/">Docker Hub</link> is used to pull
images.
that it can be used to pull a Docker image from a Docker registry. By
default <link xlink:href="https://hub.docker.com/">Docker Hub</link> is used
to pull images.
</para>
<para>
@ -484,10 +484,10 @@ sha256:20d9485b25ecfd89204e843a962c1bd70e9cc6858d65d7f5fadc340246e2116b
<para>
This function is analogous to the <command>docker export</command> command,
in that it can be used to flatten a Docker image that contains multiple layers. It
is in fact the result of the merge of all the layers of the image. As such,
the result is suitable for being imported in Docker with <command>docker
import</command>.
in that it can be used to flatten a Docker image that contains multiple
layers. It is in fact the result of the merge of all the layers of the
image. As such, the result is suitable for being imported in Docker with
<command>docker import</command>.
</para>
<note>

116
doc/functions/fetchers.xml
View File

@ -5,24 +5,21 @@
<title>Fetcher functions</title>
<para>
When using Nix, you will frequently need to download source code
and other files from the internet. Nixpkgs comes with a few helper
functions that allow you to fetch fixed-output derivations in a
structured way.
When using Nix, you will frequently need to download source code and other
files from the internet. Nixpkgs comes with a few helper functions that allow
you to fetch fixed-output derivations in a structured way.
</para>
<para>
The two fetcher primitives are <function>fetchurl</function> and
<function>fetchzip</function>. Both of these have two required
arguments, a URL and a hash. The hash is typically
<literal>sha256</literal>, although many more hash algorithms are
supported. Nixpkgs contributors are currently recommended to use
<literal>sha256</literal>. This hash will be used by Nix to
identify your source. A typical usage of fetchurl is provided
below.
<function>fetchzip</function>. Both of these have two required arguments, a
URL and a hash. The hash is typically <literal>sha256</literal>, although
many more hash algorithms are supported. Nixpkgs contributors are currently
recommended to use <literal>sha256</literal>. This hash will be used by Nix
to identify your source. A typical usage of fetchurl is provided below.
</para>
<programlisting><![CDATA[
<programlisting><![CDATA[
{ stdenv, fetchurl }:
stdenv.mkDerivation {
@ -37,30 +34,28 @@ stdenv.mkDerivation {
<para>
The main difference between <function>fetchurl</function> and
<function>fetchzip</function> is in how they store the contents.
<function>fetchurl</function> will store the unaltered contents of
the URL within the Nix store. <function>fetchzip</function> on the
other hand will decompress the archive for you, making files and
directories directly accessible in the future.
<function>fetchzip</function> can only be used with archives.
Despite the name, <function>fetchzip</function> is not limited to
<function>fetchurl</function> will store the unaltered contents of the URL
within the Nix store. <function>fetchzip</function> on the other hand will
decompress the archive for you, making files and directories directly
accessible in the future. <function>fetchzip</function> can only be used with
archives. Despite the name, <function>fetchzip</function> is not limited to
.zip files and can also be used with any tarball.
</para>
<para>
<function>fetchpatch</function> works very similarly to
<function>fetchurl</function> with the same arguments expected. It
expects patch files as a source and and performs normalization on
them before computing the checksum. For example it will remove
comments or other unstable parts that are sometimes added by
version control systems and can change over time.
<function>fetchurl</function> with the same arguments expected. It expects
patch files as a source and and performs normalization on them before
computing the checksum. For example it will remove comments or other unstable
parts that are sometimes added by version control systems and can change over
time.
</para>
<para>
Other fetcher functions allow you to add source code directly from
a VCS such as subversion or git. These are mostly straightforward
names based on the name of the command used with the VCS system.
Because they give you a working repository, they act most like
<function>fetchzip</function>.
Other fetcher functions allow you to add source code directly from a VCS such
as subversion or git. These are mostly straightforward names based on the
name of the command used with the VCS system. Because they give you a working
repository, they act most like <function>fetchzip</function>.
</para>
<variablelist>
@ -70,9 +65,8 @@ stdenv.mkDerivation {
</term>
<listitem>
<para>
Used with Subversion. Expects <literal>url</literal> to a
Subversion directory, <literal>rev</literal>, and
<literal>sha256</literal>.
Used with Subversion. Expects <literal>url</literal> to a Subversion
directory, <literal>rev</literal>, and <literal>sha256</literal>.
</para>
</listitem>
</varlistentry>
@ -84,9 +78,8 @@ stdenv.mkDerivation {
<para>
Used with Git. Expects <literal>url</literal> to a Git repo,
<literal>rev</literal>, and <literal>sha256</literal>.
<literal>rev</literal> in this case can be full the git commit
id (SHA1 hash) or a tag name like
<literal>refs/tags/v1.0</literal>.
<literal>rev</literal> in this case can be full the git commit id (SHA1
hash) or a tag name like <literal>refs/tags/v1.0</literal>.
</para>
</listitem>
</varlistentry>
@ -96,8 +89,8 @@ stdenv.mkDerivation {
</term>
<listitem>
<para>
Used with Fossil. Expects <literal>url</literal> to a Fossil
archive, <literal>rev</literal>, and <literal>sha256</literal>.
Used with Fossil. Expects <literal>url</literal> to a Fossil archive,
<literal>rev</literal>, and <literal>sha256</literal>.
</para>
</listitem>
</varlistentry>
@ -107,8 +100,8 @@ stdenv.mkDerivation {
</term>
<listitem>
<para>
Used with CVS. Expects <literal>cvsRoot</literal>,
<literal>tag</literal>, and <literal>sha256</literal>.
Used with CVS. Expects <literal>cvsRoot</literal>, <literal>tag</literal>,
and <literal>sha256</literal>.
</para>
</listitem>
</varlistentry>
@ -126,11 +119,10 @@ stdenv.mkDerivation {
</variablelist>
<para>
A number of fetcher functions wrap part of
<function>fetchurl</function> and <function>fetchzip</function>.
They are mainly convenience functions intended for commonly used
destinations of source code in Nixpkgs. These wrapper fetchers are
listed below.
A number of fetcher functions wrap part of <function>fetchurl</function> and
<function>fetchzip</function>. They are mainly convenience functions intended
for commonly used destinations of source code in Nixpkgs. These wrapper
fetchers are listed below.
</para>
<variablelist>
@ -141,17 +133,15 @@ stdenv.mkDerivation {
<listitem>
<para>
<function>fetchFromGitHub</function> expects four arguments.
<literal>owner</literal> is a string corresponding to the
GitHub user or organization that controls this repository.
<literal>repo</literal> corresponds to the name of the
software repository. These are located at the top of every
GitHub HTML page as
<literal>owner</literal>/<literal>repo</literal>.
<literal>rev</literal> corresponds to the Git commit hash or
tag (e.g <literal>v1.0</literal>) that will be downloaded from
Git. Finally, <literal>sha256</literal> corresponds to the
hash of the extracted directory. Again, other hash algorithms
are also available but <literal>sha256</literal> is currently
<literal>owner</literal> is a string corresponding to the GitHub user or
organization that controls this repository. <literal>repo</literal>
corresponds to the name of the software repository. These are located at
the top of every GitHub HTML page as
<literal>owner</literal>/<literal>repo</literal>. <literal>rev</literal>
corresponds to the Git commit hash or tag (e.g <literal>v1.0</literal>)
that will be downloaded from Git. Finally, <literal>sha256</literal>
corresponds to the hash of the extracted directory. Again, other hash
algorithms are also available but <literal>sha256</literal> is currently
preferred.
</para>
</listitem>
@ -162,8 +152,8 @@ stdenv.mkDerivation {
</term>
<listitem>
<para>
This is used with GitLab repositories. The arguments expected
are very similar to fetchFromGitHub above.
This is used with GitLab repositories. The arguments expected are very
similar to fetchFromGitHub above.
</para>
</listitem>
</varlistentry>
@ -173,8 +163,8 @@ stdenv.mkDerivation {
</term>
<listitem>
<para>
This is used with BitBucket repositories. The arguments expected
are very similar to fetchFromGitHub above.
This is used with BitBucket repositories. The arguments expected are very
similar to fetchFromGitHub above.
</para>
</listitem>
</varlistentry>
@ -184,8 +174,8 @@ stdenv.mkDerivation {
</term>
<listitem>
<para>
This is used with Savannah repositories. The arguments expected
are very similar to fetchFromGitHub above.
This is used with Savannah repositories. The arguments expected are very
similar to fetchFromGitHub above.
</para>
</listitem>
</varlistentry>
@ -195,12 +185,10 @@ stdenv.mkDerivation {
</term>
<listitem>
<para>
This is used with repo.or.cz repositories. The arguments
expected are very similar to fetchFromGitHub above.
This is used with repo.or.cz repositories. The arguments expected are very
similar to fetchFromGitHub above.
</para>
</listitem>
</varlistentry>
</variablelist>
</section>

7
doc/functions/library.xml
View File

@ -13,12 +13,17 @@
<xi:include href="./library/attrsets.xml" />
<!-- These docs are generated via nixdoc. To add another generated
<!-- These docs are generated via nixdoc. To add another generated
library function file to this list, the file
`lib-function-docs.nix` must also be updated. -->
<xi:include href="./library/generated/strings.xml" />
<xi:include href="./library/generated/trivial.xml" />
<xi:include href="./library/generated/lists.xml" />
<xi:include href="./library/generated/debug.xml" />
<xi:include href="./library/generated/options.xml" />
</section>

28
doc/functions/nix-gitignore.xml
View File

@ -17,12 +17,12 @@
<literal>pkgs.nix-gitignore</literal> exports a number of functions, but
you'll most likely need either <literal>gitignoreSource</literal> or
<literal>gitignoreSourcePure</literal>. As their first argument, they both
accept either 1. a file with gitignore lines or 2. a string
with gitignore lines, or 3. a list of either of the two. They will be
concatenated into a single big string.
accept either 1. a file with gitignore lines or 2. a string with gitignore
lines, or 3. a list of either of the two. They will be concatenated into a
single big string.
</para>
<programlisting><![CDATA[
<programlisting><![CDATA[
{ pkgs ? import <nixpkgs> {} }:
nix-gitignore.gitignoreSource [] ./source
@ -40,24 +40,29 @@
]]></programlisting>
<para>
These functions are derived from the <literal>Filter</literal> functions
by setting the first filter argument to <literal>(_: _: true)</literal>:
These functions are derived from the <literal>Filter</literal> functions by
setting the first filter argument to <literal>(_: _: true)</literal>:
</para>
<programlisting><![CDATA[
<programlisting><![CDATA[
gitignoreSourcePure = gitignoreFilterSourcePure (_: _: true);
gitignoreSource = gitignoreFilterSource (_: _: true);
]]></programlisting>
<para>
Those filter functions accept the same arguments the <literal>builtins.filterSource</literal> function would pass to its filters, thus <literal>fn: gitignoreFilterSourcePure fn ""</literal> should be extensionally equivalent to <literal>filterSource</literal>. The file is blacklisted iff it's blacklisted by either your filter or the gitignoreFilter.
Those filter functions accept the same arguments the
<literal>builtins.filterSource</literal> function would pass to its filters,
thus <literal>fn: gitignoreFilterSourcePure fn ""</literal> should be
extensionally equivalent to <literal>filterSource</literal>. The file is
blacklisted iff it's blacklisted by either your filter or the
gitignoreFilter.
</para>
<para>
If you want to make your own filter from scratch, you may use
</para>
<programlisting><![CDATA[
<programlisting><![CDATA[
gitignoreFilter = ign: root: filterPattern (gitignoreToPatterns ign) root;
]]></programlisting>
</section>
@ -66,10 +71,11 @@ gitignoreFilter = ign: root: filterPattern (gitignoreToPatterns ign) root;
<title>gitignore files in subdirectories</title>
<para>
If you wish to use a filter that would search for .gitignore files in subdirectories, just like git does by default, use this function:
If you wish to use a filter that would search for .gitignore files in
subdirectories, just like git does by default, use this function:
</para>
<programlisting><![CDATA[
<programlisting><![CDATA[
gitignoreFilterRecursiveSource = filter: patterns: root:
# OR
gitignoreRecursiveSource = gitignoreFilterSourcePure (_: _: true);

14
doc/functions/prefer-remote-fetch.xml
View File

@ -7,17 +7,15 @@
<para>
<function>prefer-remote-fetch</function> is an overlay that download sources
on remote builder. This is useful when the evaluating machine has a slow
upload while the builder can fetch faster directly from the source.
To use it, put the following snippet as a new overlay:
<programlisting>
upload while the builder can fetch faster directly from the source. To use
it, put the following snippet as a new overlay:
<programlisting>
self: super:
(super.prefer-remote-fetch self super)
</programlisting>
A full configuration example for that sets the overlay up for your own account,
could look like this
<programlisting>
A full configuration example for that sets the overlay up for your own
account, could look like this
<programlisting>
$ mkdir ~/.config/nixpkgs/overlays/
$ cat &gt; ~/.config/nixpkgs/overlays/prefer-remote-fetch.nix &lt;&lt;EOF
self: super: super.prefer-remote-fetch self super

89
doc/functions/trivial-builders.xml
View File

@ -5,12 +5,11 @@
<title>Trivial builders</title>
<para>
Nixpkgs provides a couple of functions that help with building
derivations. The most important one,
<function>stdenv.mkDerivation</function>, has already been
documented above. The following functions wrap
<function>stdenv.mkDerivation</function>, making it easier to use
in certain cases.
Nixpkgs provides a couple of functions that help with building derivations.
The most important one, <function>stdenv.mkDerivation</function>, has already
been documented above. The following functions wrap
<function>stdenv.mkDerivation</function>, making it easier to use in certain
cases.
</para>
<variablelist>
@ -22,23 +21,20 @@
<para>
This takes three arguments, <literal>name</literal>,
<literal>env</literal>, and <literal>buildCommand</literal>.
<literal>name</literal> is just the name that Nix will append
to the store path in the same way that
<literal>stdenv.mkDerivation</literal> uses its
<literal>name</literal> attribute. <literal>env</literal> is an
attribute set specifying environment variables that will be set
for this derivation. These attributes are then passed to the
wrapped <literal>stdenv.mkDerivation</literal>.
<literal>buildCommand</literal> specifies the commands that
will be run to create this derivation. Note that you will need
to create <literal>$out</literal> for Nix to register the
command as successful.
<literal>name</literal> is just the name that Nix will append to the store
path in the same way that <literal>stdenv.mkDerivation</literal> uses its
<literal>name</literal> attribute. <literal>env</literal> is an attribute
set specifying environment variables that will be set for this derivation.
These attributes are then passed to the wrapped
<literal>stdenv.mkDerivation</literal>. <literal>buildCommand</literal>
specifies the commands that will be run to create this derivation. Note
that you will need to create <literal>$out</literal> for Nix to register
the command as successful.
</para>
<para>
An example of using <literal>runCommand</literal> is provided
below.
An example of using <literal>runCommand</literal> is provided below.
</para>
<programlisting>
<programlisting>
(import &lt;nixpkgs&gt; {}).runCommand "my-example" {} ''
echo My example command is running
@ -66,39 +62,33 @@
</term>
<listitem>
<para>
This works just like <literal>runCommand</literal>. The only
difference is that it also provides a C compiler in
<literal>buildCommand</literal>’s environment. To minimize your
dependencies, you should only use this if you are sure you will
need a C compiler as part of running your command.
This works just like <literal>runCommand</literal>. The only difference is
that it also provides a C compiler in <literal>buildCommand</literal>’s
environment. To minimize your dependencies, you should only use this if
you are sure you will need a C compiler as part of running your command.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term>
<literal>writeTextFile</literal>, <literal>writeText</literal>,
<literal>writeTextDir</literal>, <literal>writeScript</literal>,
<literal>writeScriptBin</literal>
<literal>writeTextFile</literal>, <literal>writeText</literal>, <literal>writeTextDir</literal>, <literal>writeScript</literal>, <literal>writeScriptBin</literal>
</term>
<listitem>
<para>
These functions write <literal>text</literal> to the Nix store.
This is useful for creating scripts from Nix expressions.
<literal>writeTextFile</literal> takes an attribute set and
expects two arguments, <literal>name</literal> and
<literal>text</literal>. <literal>name</literal> corresponds to
the name used in the Nix store path. <literal>text</literal>
will be the contents of the file. You can also set
<literal>executable</literal> to true to make this file have
the executable bit set.
These functions write <literal>text</literal> to the Nix store. This is
useful for creating scripts from Nix expressions.
<literal>writeTextFile</literal> takes an attribute set and expects two
arguments, <literal>name</literal> and <literal>text</literal>.
<literal>name</literal> corresponds to the name used in the Nix store
path. <literal>text</literal> will be the contents of the file. You can
also set <literal>executable</literal> to true to make this file have the
executable bit set.
</para>
<para>
Many more commands wrap <literal>writeTextFile</literal>
including <literal>writeText</literal>,
<literal>writeTextDir</literal>,
<literal>writeScript</literal>, and
<literal>writeScriptBin</literal>. These are convenience
functions over <literal>writeTextFile</literal>.
Many more commands wrap <literal>writeTextFile</literal> including
<literal>writeText</literal>, <literal>writeTextDir</literal>,
<literal>writeScript</literal>, and <literal>writeScriptBin</literal>.
These are convenience functions over <literal>writeTextFile</literal>.
</para>
</listitem>
</varlistentry>
@ -109,16 +99,15 @@
<listitem>
<para>
This can be used to put many derivations into the same directory
structure. It works by creating a new derivation and adding
symlinks to each of the paths listed. It expects two arguments,
structure. It works by creating a new derivation and adding symlinks to
each of the paths listed. It expects two arguments,
<literal>name</literal>, and <literal>paths</literal>.
<literal>name</literal> is the name used in the Nix store path
for the created derivation. <literal>paths</literal> is a list of
paths that will be symlinked. These paths can be to Nix store
derivations or any other subdirectory contained within.
<literal>name</literal> is the name used in the Nix store path for the
created derivation. <literal>paths</literal> is a list of paths that will
be symlinked. These paths can be to Nix store derivations or any other
subdirectory contained within.
</para>
</listitem>
</varlistentry>
</variablelist>
</section>

46
doc/languages-frameworks/ocaml.xml
View File

@ -7,36 +7,35 @@
OCaml libraries should be installed in
<literal>$(out)/lib/ocaml/${ocaml.version}/site-lib/</literal>. Such
directories are automatically added to the <literal>$OCAMLPATH</literal>
environment variable when building another package that depends on them
or when opening a <literal>nix-shell</literal>.
environment variable when building another package that depends on them or
when opening a <literal>nix-shell</literal>.
</para>
<para>
Given that most of the OCaml ecosystem is now built with dune,
nixpkgs includes a convenience build support function called
<literal>buildDunePackage</literal> that will build an OCaml package
using dune, OCaml and findlib and any additional dependencies provided
as <literal>buildInputs</literal> or <literal>propagatedBuildInputs</literal>.
Given that most of the OCaml ecosystem is now built with dune, nixpkgs
includes a convenience build support function called
<literal>buildDunePackage</literal> that will build an OCaml package using
dune, OCaml and findlib and any additional dependencies provided as
<literal>buildInputs</literal> or <literal>propagatedBuildInputs</literal>.
</para>
<para>
Here is a simple package example. It defines an (optional) attribute
<literal>minimumOCamlVersion</literal> that will be used to throw a
descriptive evaluation error if building with an older OCaml is attempted.
It uses the <literal>fetchFromGitHub</literal> fetcher to get its source.
It sets the <literal>doCheck</literal> (optional) attribute to
<literal>true</literal> which means that tests will be run with
<literal>dune runtest -p angstrom</literal> after the build
(<literal>dune build -p angstrom</literal>) is complete.
It uses <literal>alcotest</literal> as a build input (because it is needed
to run the tests) and <literal>bigstringaf</literal> and
<literal>result</literal> as propagated build inputs (thus they will also
be available to libraries depending on this library).
The library will be installed using the <literal>angstrom.install</literal>
file that dune generates.
descriptive evaluation error if building with an older OCaml is attempted. It
uses the <literal>fetchFromGitHub</literal> fetcher to get its source. It
sets the <literal>doCheck</literal> (optional) attribute to
<literal>true</literal> which means that tests will be run with <literal>dune
runtest -p angstrom</literal> after the build (<literal>dune build -p
angstrom</literal>) is complete. It uses <literal>alcotest</literal> as a
build input (because it is needed to run the tests) and
<literal>bigstringaf</literal> and <literal>result</literal> as propagated
build inputs (thus they will also be available to libraries depending on this
library). The library will be installed using the
<literal>angstrom.install</literal> file that dune generates.
</para>
<programlisting>
<programlisting>
{ stdenv, fetchFromGitHub, buildDunePackage, alcotest, result, bigstringaf }:
buildDunePackage rec {
@ -69,11 +68,11 @@ buildDunePackage rec {
Here is a second example, this time using a source archive generated with
<literal>dune-release</literal>. It is a good idea to use this archive when
it is available as it will usually contain substituted variables such as a
<literal>%%VERSION%%</literal> field. This library does not depend
on any other OCaml library and no tests are run after building it.
<literal>%%VERSION%%</literal> field. This library does not depend on any
other OCaml library and no tests are run after building it.
</para>
<programlisting>
<programlisting>
{ stdenv, fetchurl, buildDunePackage }:
buildDunePackage rec {
@ -95,5 +94,4 @@ buildDunePackage rec {
};
}
</programlisting>
</section>

9
doc/package-notes.xml
View File

@ -307,19 +307,20 @@ packageOverrides = pkgs: {
</screen>
</para>
</section>
<section xml:id="sec-elm">
<title>Elm</title>
<para>
To update Elm compiler, see <filename>nixpkgs/pkgs/development/compilers/elm/README.md</filename>.
To update Elm compiler, see
<filename>nixpkgs/pkgs/development/compilers/elm/README.md</filename>.
</para>
<para>
To package Elm applications, <link xlink:href="https://github.com/hercules-ci/elm2nix#elm2nix">read about elm2nix</link>.
To package Elm applications,
<link xlink:href="https://github.com/hercules-ci/elm2nix#elm2nix">read about
elm2nix</link>.
</para>
</section>
<section xml:id="sec-shell-helpers">
<title>Interactive shell helpers</title>

4
doc/platform-notes.xml
View File

@ -96,8 +96,8 @@
</programlisting>
<para>
The package <literal>xcbuild</literal> can be used to build projects that
really depend on Xcode. However, this replacement is not 100%
compatible with Xcode and can occasionally cause issues.
really depend on Xcode. However, this replacement is not 100% compatible
with Xcode and can occasionally cause issues.
</para>
</listitem>
</itemizedlist>

4
doc/quick-start.xml
View File

@ -148,8 +148,8 @@ $ git add pkgs/development/libraries/libfoo/default.nix</screen>
<listitem>
<para>
You can use <command>nix-prefetch-url</command>
<replaceable>url</replaceable> to get the
SHA-256 hash of source distributions. There are similar commands as
<replaceable>url</replaceable> to get the SHA-256 hash of source
distributions. There are similar commands as
<command>nix-prefetch-git</command> and
<command>nix-prefetch-hg</command> available in
<literal>nix-prefetch-scripts</literal> package.

14
doc/reviewing-contributions.xml
View File

@ -24,11 +24,13 @@
<para>
The high change rate of Nixpkgs makes any pull request that remains open for
too long subject to conflicts that will require extra work from the submitter
or the merger. Reviewing pull requests in a timely manner and being responsive
to the comments is the key to avoid this issue. GitHub provides sort filters
that can be used to see the <link
or the merger. Reviewing pull requests in a timely manner and being
responsive to the comments is the key to avoid this issue. GitHub provides
sort filters that can be used to see the
<link
xlink:href="https://github.com/NixOS/nixpkgs/pulls?q=is%3Apr+is%3Aopen+sort%3Aupdated-desc">most
recently</link> and the <link
recently</link> and the
<link
xlink:href="https://github.com/NixOS/nixpkgs/pulls?q=is%3Apr+is%3Aopen+sort%3Aupdated-asc">least
recently</link> updated pull requests. We highly encourage looking at
<link xlink:href="https://github.com/NixOS/nixpkgs/pulls?q=is%3Apr+is%3Aopen+review%3Anone+status%3Asuccess+-label%3A%222.status%3A+work-in-progress%22+no%3Aproject+no%3Aassignee+no%3Amilestone">
@ -609,8 +611,8 @@ policy.
create an issue or post on
<link
xlink:href="https://discourse.nixos.org">Discourse</link> with
references of packages and modules they maintain so the maintainership can be
taken over by other contributors.
references of packages and modules they maintain so the maintainership can
be taken over by other contributors.
</para>
</section>
</chapter>

450
doc/stdenv.xml
View File

@ -228,18 +228,17 @@ genericBuild
</para>
<para>
The extension of <envar>PATH</envar> with dependencies, alluded to
above, proceeds according to the relative platforms alone. The
process is carried out only for dependencies whose host platform
matches the new derivation's build platform i.e. dependencies which
run on the platform where the new derivation will be built.
The extension of <envar>PATH</envar> with dependencies, alluded to above,
proceeds according to the relative platforms alone. The process is carried
out only for dependencies whose host platform matches the new derivation's
build platform i.e. dependencies which run on the platform where the new
derivation will be built.
<footnote xml:id="footnote-stdenv-native-dependencies-in-path">
<para>
Currently, this means for native builds all dependencies are put
on the <envar>PATH</envar>. But in the future that may not be the
case for sake of matching cross: the platforms would be assumed
to be unique for native and cross builds alike, so only the
<varname>depsBuild*</varname> and
Currently, this means for native builds all dependencies are put on the
<envar>PATH</envar>. But in the future that may not be the case for sake
of matching cross: the platforms would be assumed to be unique for native
and cross builds alike, so only the <varname>depsBuild*</varname> and
<varname>nativeBuildInputs</varname> would be added to the
<envar>PATH</envar>.
</para>
@ -252,9 +251,10 @@ genericBuild
<para>
The dependency is propagated when it forces some of its other-transitive
(non-immediate) downstream dependencies to also take it on as an immediate
dependency. Nix itself already takes a package's transitive dependencies into
account, but this propagation ensures nixpkgs-specific infrastructure like
setup hooks (mentioned above) also are run as if the propagated dependency.
dependency. Nix itself already takes a package's transitive dependencies
into account, but this propagation ensures nixpkgs-specific infrastructure
like setup hooks (mentioned above) also are run as if the propagated
dependency.
</para>
<para>
@ -270,9 +270,9 @@ genericBuild
described by the current dependency's platform offsets. This results in sort
a transitive closure of the dependency relation, with the offsets being
approximately summed when two dependency links are combined. We also prune
transitive dependencies whose combined offsets go out-of-bounds, which can be
viewed as a filter over that transitive closure removing dependencies that
are blatantly absurd.
transitive dependencies whose combined offsets go out-of-bounds, which can
be viewed as a filter over that transitive closure removing dependencies
that are blatantly absurd.
</para>
<para>
@ -287,8 +287,8 @@ genericBuild
propagation logic.
</para>
</footnote>
They're confusing in very different ways so... hopefully if something doesn't
make sense in one presentation, it will in the other!
They're confusing in very different ways so... hopefully if something
doesn't make sense in one presentation, it will in the other!
<programlisting>
let mapOffset(h, t, i) = i + (if i &lt;= 0 then h else t - 1)
@ -324,31 +324,31 @@ let f(h, h + 1, i) = i + (if i &lt;= 0 then h else (h + 1) - 1)
let f(h, h + 1, i) = i + (if i &lt;= 0 then h else h)
let f(h, h + 1, i) = i + h
</programlisting>
This is where "sum-like" comes in from above: We can just sum all of the host
offsets to get the host offset of the transitive dependency. The target
offset is the transitive dependency is simply the host offset + 1, just as it
was with the dependencies composed to make this transitive one; it can be
This is where "sum-like" comes in from above: We can just sum all of the
host offsets to get the host offset of the transitive dependency. The target
offset is the transitive dependency is simply the host offset + 1, just as
it was with the dependencies composed to make this transitive one; it can be
ignored as it doesn't add any new information.
</para>
<para>
Because of the bounds checks, the uncommon cases are <literal>h = t</literal>
and <literal>h + 2 = t</literal>. In the former case, the motivation for
<function>mapOffset</function> is that since its host and target platforms
are the same, no transitive dependency of it should be able to "discover" an
offset greater than its reduced target offsets.
Because of the bounds checks, the uncommon cases are <literal>h =
t</literal> and <literal>h + 2 = t</literal>. In the former case, the
motivation for <function>mapOffset</function> is that since its host and
target platforms are the same, no transitive dependency of it should be able
to "discover" an offset greater than its reduced target offsets.
<function>mapOffset</function> effectively "squashes" all its transitive
dependencies' offsets so that none will ever be greater than the target
offset of the original <literal>h = t</literal> package. In the other case,
<literal>h + 1</literal> is skipped over between the host and target offsets.
Instead of squashing the offsets, we need to "rip" them apart so no
<literal>h + 1</literal> is skipped over between the host and target
offsets. Instead of squashing the offsets, we need to "rip" them apart so no
transitive dependencies' offset is that one.
</para>
<para>
Overall, the unifying theme here is that propagation shouldn't be introducing
transitive dependencies involving platforms the depending package is unaware
of. The offset bounds checking and definition of
Overall, the unifying theme here is that propagation shouldn't be
introducing transitive dependencies involving platforms the depending
package is unaware of. The offset bounds checking and definition of
<function>mapOffset</function> together ensure that this is the case.
Discovering a new offset is discovering a new platform, and since those
platforms weren't in the derivation "spec" of the needing package, they
@ -381,8 +381,8 @@ let f(h, h + 1, i) = i + h
Since these packages are able to be run at build-time, they are always
added to the <envar>PATH</envar>, as described above. But since these
packages are only guaranteed to be able to run then, they shouldn't
persist as run-time dependencies. This isn't currently enforced, but could
be in the future.
persist as run-time dependencies. This isn't currently enforced, but
could be in the future.
</para>
</listitem>
</varlistentry>
@ -396,10 +396,10 @@ let f(h, h + 1, i) = i + h
platform, and target platform is the new derivation's host platform. This
means a <literal>-1</literal> host offset and <literal>0</literal> target
offset from the new derivation's platforms. These are programs and
libraries used at build-time that, if they are a compiler or similar tool,
produce code to run at run-time—i.e. tools used to build the new
derivation. If the dependency doesn't care about the target platform (i.e.
isn't a compiler or similar tool), put it here, rather than in
libraries used at build-time that, if they are a compiler or similar
tool, produce code to run at run-time—i.e. tools used to build the new
derivation. If the dependency doesn't care about the target platform
(i.e. isn't a compiler or similar tool), put it here, rather than in
<varname>depsBuildBuild</varname> or <varname>depsBuildTarget</varname>.
This could be called <varname>depsBuildHost</varname> but
<varname>nativeBuildInputs</varname> is used for historical continuity.
@ -407,8 +407,9 @@ let f(h, h + 1, i) = i + h
<para>
Since these packages are able to be run at build-time, they are added to
the <envar>PATH</envar>, as described above. But since these packages are
only guaranteed to be able to run then, they shouldn't persist as run-time
dependencies. This isn't currently enforced, but could be in the future.
only guaranteed to be able to run then, they shouldn't persist as
run-time dependencies. This isn't currently enforced, but could be in the
future.
</para>
</listitem>
</varlistentry>
@ -421,33 +422,36 @@ let f(h, h + 1, i) = i + h
A list of dependencies whose host platform is the new derivation's build
platform, and target platform is the new derivation's target platform.
This means a <literal>-1</literal> host offset and <literal>1</literal>
target offset from the new derivation's platforms. These are programs used
at build time that produce code to run with code produced by the depending
package. Most commonly, these are tools used to build the runtime or
standard library that the currently-being-built compiler will inject into
any code it compiles. In many cases, the currently-being-built-compiler is
itself employed for that task, but when that compiler won't run (i.e. its
build and host platform differ) this is not possible. Other times, the
compiler relies on some other tool, like binutils, that is always built
separately so that the dependency is unconditional.
target offset from the new derivation's platforms. These are programs
used at build time that produce code to run with code produced by the
depending package. Most commonly, these are tools used to build the
runtime or standard library that the currently-being-built compiler will
inject into any code it compiles. In many cases, the
currently-being-built-compiler is itself employed for that task, but when
that compiler won't run (i.e. its build and host platform differ) this is
not possible. Other times, the compiler relies on some other tool, like
binutils, that is always built separately so that the dependency is
unconditional.
</para>
<para>
This is a somewhat confusing concept to wrap one’s head around, and for
good reason. As the only dependency type where the platform offsets are
not adjacent integers, it requires thinking of a bootstrapping stage
<emphasis>two</emphasis> away from the current one. It and its use-case go
hand in hand and are both considered poor form: try to not need this sort
of dependency, and try to avoid building standard libraries and runtimes
in the same derivation as the compiler produces code using them. Instead
strive to build those like a normal library, using the newly-built
compiler just as a normal library would. In short, do not use this
attribute unless you are packaging a compiler and are sure it is needed.
<emphasis>two</emphasis> away from the current one. It and its use-case
go hand in hand and are both considered poor form: try to not need this
sort of dependency, and try to avoid building standard libraries and
runtimes in the same derivation as the compiler produces code using them.
Instead strive to build those like a normal library, using the
newly-built compiler just as a normal library would. In short, do not use
this attribute unless you are packaging a compiler and are sure it is
needed.
</para>
<para>
Since these packages are able to run at build time, they are added to the
<envar>PATH</envar>, as described above. But since these packages are only
guaranteed to be able to run then, they shouldn't persist as run-time
dependencies. This isn't currently enforced, but could be in the future.
<envar>PATH</envar>, as described above. But since these packages are
only guaranteed to be able to run then, they shouldn't persist as
run-time dependencies. This isn't currently enforced, but could be in the
future.
</para>
</listitem>
</varlistentry>
@ -462,11 +466,11 @@ let f(h, h + 1, i) = i + h
and <literal>0</literal> target offset from the new derivation's host
platform. These are packages used at run-time to generate code also used
at run-time. In practice, this would usually be tools used by compilers
for macros or a metaprogramming system, or libraries used by the macros or
metaprogramming code itself. It's always preferable to use a
<varname>depsBuildBuild</varname> dependency in the derivation being built
over a <varname>depsHostHost</varname> on the tool doing the building for
this purpose.
for macros or a metaprogramming system, or libraries used by the macros
or metaprogramming code itself. It's always preferable to use a
<varname>depsBuildBuild</varname> dependency in the derivation being
built over a <varname>depsHostHost</varname> on the tool doing the
building for this purpose.
</para>
</listitem>
</varlistentry>
@ -481,8 +485,8 @@ let f(h, h + 1, i) = i + h
<literal>1</literal> target offset from the new derivation's host
platform. This would be called <varname>depsHostTarget</varname> but for
historical continuity. If the dependency doesn't care about the target
platform (i.e. isn't a compiler or similar tool), put it here, rather than
in <varname>depsBuildBuild</varname>.
platform (i.e. isn't a compiler or similar tool), put it here, rather
than in <varname>depsBuildBuild</varname>.
</para>
<para>
These are often programs and libraries used by the new derivation at
@ -664,10 +668,11 @@ passthru = {
<literal>hello.baz.value1</literal>. We don't specify any usage or schema
of <literal>passthru</literal> - it is meant for values that would be
useful outside the derivation in other parts of a Nix expression (e.g. in
other derivations). An example would be to convey some specific dependency
of your derivation which contains a program with plugins support. Later,
others who make derivations with plugins can use passed-through dependency
to ensure that their plugin would be binary-compatible with built program.
other derivations). An example would be to convey some specific
dependency of your derivation which contains a program with plugins
support. Later, others who make derivations with plugins can use
passed-through dependency to ensure that their plugin would be
binary-compatible with built program.
</para>
</listitem>
</varlistentry>
@ -677,9 +682,9 @@ passthru = {
</term>
<listitem>
<para>
A script to be run by <filename>maintainers/scripts/update.nix</filename> when
the package is matched. It needs to be an executable file, either on the file
system:
A script to be run by <filename>maintainers/scripts/update.nix</filename>
when the package is matched. It needs to be an executable file, either on
the file system:
<programlisting>
passthru.updateScript = ./update.sh;
</programlisting>
@ -695,16 +700,24 @@ passthru.updateScript = writeScript "update-zoom-us" ''
update-source-version zoom-us "$version"
'';
</programlisting>
The attribute can also contain a list, a script followed by arguments to be passed to it:
The attribute can also contain a list, a script followed by arguments to
be passed to it:
<programlisting>
passthru.updateScript = [ ../../update.sh pname "--requested-release=unstable" ];
</programlisting>
Note that the update scripts will be run in parallel by default; you should avoid running <command>git commit</command> or any other commands that cannot handle that.
Note that the update scripts will be run in parallel by default; you
should avoid running <command>git commit</command> or any other commands
that cannot handle that.
</para>
<para>
For information about how to run the updates, execute
<cmdsynopsis><command>nix-shell</command> <arg>maintainers/scripts/update.nix</arg></cmdsynopsis>.
<cmdsynopsis>
<command>nix-shell</command>
<arg>
maintainers/scripts/update.nix
</arg>
</cmdsynopsis>
.
</para>
</listitem>
</varlistentry>
@ -1178,8 +1191,8 @@ passthru.updateScript = [ ../../update.sh pname "--requested-release=unstable" ]
By default, when cross compiling, the configure script has
<option>--build=...</option> and <option>--host=...</option> passed.
Packages can instead pass <literal>[ "build" "host" "target" ]</literal>
or a subset to control exactly which platform flags are passed. Compilers
and other tools can use this to also pass the target platform.
or a subset to control exactly which platform flags are passed.
Compilers and other tools can use this to also pass the target platform.
<footnote xml:id="footnote-stdenv-build-time-guessing-impurity">
<para>
Eventually these will be passed building natively as well, to improve
@ -1694,10 +1707,11 @@ installTargets = "install-bin install-doc";</programlisting>
</term>
<listitem>
<para>
A package can export a <link linkend="ssec-setup-hooks">setup hook</link>
by setting this variable. The setup hook, if defined, is copied to
<filename>$out/nix-support/setup-hook</filename>. Environment variables
are then substituted in it using <function
A package can export a <link linkend="ssec-setup-hooks">setup
hook</link> by setting this variable. The setup hook, if defined, is
copied to <filename>$out/nix-support/setup-hook</filename>. Environment
variables are then substituted in it using
<function
linkend="fun-substituteAll">substituteAll</function>.
</para>
</listitem>
@ -1812,8 +1826,8 @@ set debug-file-directory ~/.nix-profile/lib/debug
<listitem>
<para>
A list of dependencies used by the phase. This gets included in
<varname>nativeBuildInputs</varname> when <varname>doInstallCheck</varname> is
set.
<varname>nativeBuildInputs</varname> when
<varname>doInstallCheck</varname> is set.
</para>
</listitem>
</varlistentry>
@ -2160,10 +2174,11 @@ someVar=$(stripHash $name)
dependency derivation is already built just the same—depending is just
needing something to exist, and needing is idempotent. However, a dependency
specified twice will have its setup hook run twice, and that could easily
change the build environment (though a well-written setup hook will therefore
strive to be idempotent so this is in fact not observable). More broadly,
setup hooks are anti-modular in that multiple dependencies, whether the same
or different, should not interfere and yet their setup hooks may well do so.
change the build environment (though a well-written setup hook will
therefore strive to be idempotent so this is in fact not observable). More
broadly, setup hooks are anti-modular in that multiple dependencies, whether
the same or different, should not interfere and yet their setup hooks may
well do so.
</para>
<para>
@ -2185,11 +2200,12 @@ someVar=$(stripHash $name)
Returning to the C compiler wrapper example, if the wrapper itself is an
<literal>n</literal> dependency, then it only wants to accumulate flags from
<literal>n + 1</literal> dependencies, as only those ones match the
compiler's target platform. The <envar>hostOffset</envar> variable is defined
with the current dependency's host offset <envar>targetOffset</envar> with
its target offset, before its setup hook is sourced. Additionally, since most
environment hooks don't care about the target platform, that means the setup
hook can append to the right bash array by doing something like
compiler's target platform. The <envar>hostOffset</envar> variable is
defined with the current dependency's host offset
<envar>targetOffset</envar> with its target offset, before its setup hook is
sourced. Additionally, since most environment hooks don't care about the
target platform, that means the setup hook can append to the right bash
array by doing something like
<programlisting language="bash">
addEnvHooks "$hostOffset" myBashFunction
</programlisting>
@ -2204,11 +2220,10 @@ addEnvHooks "$hostOffset" myBashFunction
</para>
<para>
First, let’s cover some setup hooks that are part of Nixpkgs
default stdenv. This means that they are run for every package
built using <function>stdenv.mkDerivation</function>. Some of
these are platform specific, so they may run on Linux but not
Darwin or vice-versa.
First, let’s cover some setup hooks that are part of Nixpkgs default
stdenv. This means that they are run for every package built using
<function>stdenv.mkDerivation</function>. Some of these are platform
specific, so they may run on Linux but not Darwin or vice-versa.
<variablelist>
<varlistentry>
<term>
@ -2217,10 +2232,9 @@ addEnvHooks "$hostOffset" myBashFunction
<listitem>
<para>
This setup hook moves any installed documentation to the
<literal>/share</literal> subdirectory directory. This includes
the man, doc and info directories. This is needed for legacy
programs that do not know how to use the
<literal>share</literal> subdirectory.
<literal>/share</literal> subdirectory directory. This includes the man,
doc and info directories. This is needed for legacy programs that do not
know how to use the <literal>share</literal> subdirectory.
</para>
</listitem>
</varlistentry>
@ -2230,9 +2244,9 @@ addEnvHooks "$hostOffset" myBashFunction
</term>
<listitem>
<para>
This setup hook compresses any man pages that have been
installed. The compression is done using the gzip program. This
helps to reduce the installed size of packages.
This setup hook compresses any man pages that have been installed. The
compression is done using the gzip program. This helps to reduce the
installed size of packages.
</para>
</listitem>
</varlistentry>
@ -2242,10 +2256,9 @@ addEnvHooks "$hostOffset" myBashFunction
</term>
<listitem>
<para>
This runs the strip command on installed binaries and
libraries. This removes unnecessary information like debug
symbols when they are not needed. This also helps to reduce the
installed size of packages.
This runs the strip command on installed binaries and libraries. This
removes unnecessary information like debug symbols when they are not
needed. This also helps to reduce the installed size of packages.
</para>
</listitem>
</varlistentry>
@ -2255,13 +2268,12 @@ addEnvHooks "$hostOffset" myBashFunction
</term>
<listitem>
<para>
This setup hook patches installed scripts to use the full path
to the shebang interpreter. A shebang interpreter is the first
commented line of a script telling the operating system which
program will run the script (e.g <literal>#!/bin/bash</literal>). In
Nix, we want an exact path to that interpreter to be used. This
often replaces <literal>/bin/sh</literal> with a path in the
Nix store.
This setup hook patches installed scripts to use the full path to the
shebang interpreter. A shebang interpreter is the first commented line
of a script telling the operating system which program will run the
script (e.g <literal>#!/bin/bash</literal>). In Nix, we want an exact
path to that interpreter to be used. This often replaces
<literal>/bin/sh</literal> with a path in the Nix store.
</para>
</listitem>
</varlistentry>
@ -2271,10 +2283,10 @@ addEnvHooks "$hostOffset" myBashFunction
</term>
<listitem>
<para>
This verifies that no references are left from the install
binaries to the directory used to build those binaries. This
ensures that the binaries do not need things outside the Nix
store. This is currently supported in Linux only.
This verifies that no references are left from the install binaries to
the directory used to build those binaries. This ensures that the
binaries do not need things outside the Nix store. This is currently
supported in Linux only.
</para>
</listitem>
</varlistentry>
@ -2284,12 +2296,12 @@ addEnvHooks "$hostOffset" myBashFunction
</term>
<listitem>
<para>
This setup hook adds configure flags that tell packages to
install files into any one of the proper outputs listed in
<literal>outputs</literal>. This behavior can be turned off by setting
This setup hook adds configure flags that tell packages to install files
into any one of the proper outputs listed in <literal>outputs</literal>.
This behavior can be turned off by setting
<literal>setOutputFlags</literal> to false in the derivation
environment. See <xref linkend="chap-multiple-output"/> for
more information.
environment. See <xref linkend="chap-multiple-output"/> for more
information.
</para>
</listitem>
</varlistentry>
@ -2299,9 +2311,9 @@ addEnvHooks "$hostOffset" myBashFunction
</term>
<listitem>
<para>
This setup hook moves any binaries installed in the sbin
subdirectory into bin. In addition, a link is provided from
sbin to bin for compatibility.
This setup hook moves any binaries installed in the sbin subdirectory
into bin. In addition, a link is provided from sbin to bin for
compatibility.
</para>
</listitem>
</varlistentry>
@ -2311,9 +2323,9 @@ addEnvHooks "$hostOffset" myBashFunction
</term>
<listitem>
<para>
This setup hook moves any libraries installed in the lib64
subdirectory into lib. In addition, a link is provided from
lib64 to lib for compatibility.
This setup hook moves any libraries installed in the lib64 subdirectory
into lib. In addition, a link is provided from lib64 to lib for
compatibility.
</para>
</listitem>
</varlistentry>
@ -2323,8 +2335,8 @@ addEnvHooks "$hostOffset" myBashFunction
</term>
<listitem>
<para>
This sets <literal>SOURCE_DATE_EPOCH</literal> to the
modification time of the most recent file.
This sets <literal>SOURCE_DATE_EPOCH</literal> to the modification time
of the most recent file.
</para>
</listitem>
</varlistentry>
@ -2335,19 +2347,19 @@ addEnvHooks "$hostOffset" myBashFunction
<listitem>
<para>
The Bintools Wrapper wraps the binary utilities for a bunch of
miscellaneous purposes. These are GNU Binutils when targetting Linux, and
a mix of cctools and GNU binutils for Darwin. [The "Bintools" name is
supposed to be a compromise between "Binutils" and "cctools" not denoting
any specific implementation.] Specifically, the underlying bintools
package, and a C standard library (glibc or Darwin's libSystem, just for
the dynamic loader) are all fed in, and dependency finding, hardening
(see below), and purity checks for each are handled by the Bintools
Wrapper. Packages typically depend on CC Wrapper, which in turn (at run
time) depends on the Bintools Wrapper.
miscellaneous purposes. These are GNU Binutils when targetting Linux,
and a mix of cctools and GNU binutils for Darwin. [The "Bintools" name
is supposed to be a compromise between "Binutils" and "cctools" not
denoting any specific implementation.] Specifically, the underlying
bintools package, and a C standard library (glibc or Darwin's libSystem,
just for the dynamic loader) are all fed in, and dependency finding,
hardening (see below), and purity checks for each are handled by the
Bintools Wrapper. Packages typically depend on CC Wrapper, which in turn
(at run time) depends on the Bintools Wrapper.
</para>
<para>
The Bintools Wrapper was only just recently split off from CC Wrapper, so
the division of labor is still being worked out. For example, it
The Bintools Wrapper was only just recently split off from CC Wrapper,
so the division of labor is still being worked out. For example, it
shouldn't care about about the C standard library, but just take a
derivation with the dynamic loader (which happens to be the glibc on
linux). Dependency finding however is a task both wrappers will continue
@ -2357,11 +2369,12 @@ addEnvHooks "$hostOffset" myBashFunction
<varname>nativeBuildInputs</varname>) in environment variables. The
Bintools Wrapper's setup hook causes any <filename>lib</filename> and
<filename>lib64</filename> subdirectories to be added to
<envar>NIX_LDFLAGS</envar>. Since the CC Wrapper and the Bintools Wrapper
use the same strategy, most of the Bintools Wrapper code is sparsely
commented and refers to the CC Wrapper. But the CC Wrapper's code, by
contrast, has quite lengthy comments. The Bintools Wrapper merely cites
those, rather than repeating them, to avoid falling out of sync.
<envar>NIX_LDFLAGS</envar>. Since the CC Wrapper and the Bintools
Wrapper use the same strategy, most of the Bintools Wrapper code is
sparsely commented and refers to the CC Wrapper. But the CC Wrapper's
code, by contrast, has quite lengthy comments. The Bintools Wrapper
merely cites those, rather than repeating them, to avoid falling out of
sync.
</para>
<para>
A final task of the setup hook is defining a number of standard
@ -2370,8 +2383,8 @@ addEnvHooks "$hostOffset" myBashFunction
under the assumption that the Bintools Wrapper's binaries will be on the
path. Firstly, this helps poorly-written packages, e.g. ones that look
for just <command>gcc</command> when <envar>CC</envar> isn't defined yet
<command>clang</command> is to be used. Secondly, this helps packages not
get confused when cross-compiling, in which case multiple Bintools
<command>clang</command> is to be used. Secondly, this helps packages
not get confused when cross-compiling, in which case multiple Bintools
Wrappers may simultaneously be in use.
<footnote xml:id="footnote-stdenv-per-platform-wrapper">
<para>
@ -2387,16 +2400,16 @@ addEnvHooks "$hostOffset" myBashFunction
Wrappers, properly disambiguating them.
</para>
<para>
A problem with this final task is that the Bintools Wrapper is honest and
defines <envar>LD</envar> as <command>ld</command>. Most packages,
A problem with this final task is that the Bintools Wrapper is honest
and defines <envar>LD</envar> as <command>ld</command>. Most packages,
however, firstly use the C compiler for linking, secondly use
<envar>LD</envar> anyways, defining it as the C compiler, and thirdly,
only so define <envar>LD</envar> when it is undefined as a fallback. This
triple-threat means Bintools Wrapper will break those packages, as LD is
already defined as the actual linker which the package won't override yet
doesn't want to use. The workaround is to define, just for the
problematic package, <envar>LD</envar> as the C compiler. A good way to
do this would be <command>preConfigure = "LD=$CC"</command>.
only so define <envar>LD</envar> when it is undefined as a fallback.
This triple-threat means Bintools Wrapper will break those packages, as
LD is already defined as the actual linker which the package won't
override yet doesn't want to use. The workaround is to define, just for
the problematic package, <envar>LD</envar> as the C compiler. A good way
to do this would be <command>preConfigure = "LD=$CC"</command>.
</para>
</listitem>
</varlistentry>
@ -2406,13 +2419,13 @@ addEnvHooks "$hostOffset" myBashFunction
</term>
<listitem>
<para>
The CC Wrapper wraps a C toolchain for a bunch of miscellaneous purposes.
Specifically, a C compiler (GCC or Clang), wrapped binary tools, and a C
standard library (glibc or Darwin's libSystem, just for the dynamic
loader) are all fed in, and dependency finding, hardening (see below),
and purity checks for each are handled by the CC Wrapper. Packages
typically depend on the CC Wrapper, which in turn (at run-time) depends
on the Bintools Wrapper.
The CC Wrapper wraps a C toolchain for a bunch of miscellaneous
purposes. Specifically, a C compiler (GCC or Clang), wrapped binary
tools, and a C standard library (glibc or Darwin's libSystem, just for
the dynamic loader) are all fed in, and dependency finding, hardening
(see below), and purity checks for each are handled by the CC Wrapper.
Packages typically depend on the CC Wrapper, which in turn (at run-time)
depends on the Bintools Wrapper.
</para>
<para>
Dependency finding is undoubtedly the main task of the CC Wrapper. This
@ -2438,10 +2451,9 @@ addEnvHooks "$hostOffset" myBashFunction
</para>
<para>
Here are some more packages that provide a setup hook. Since the
list of hooks is extensible, this is not an exhaustive list the
mechanism is only to be used as a last resort, it might cover most
uses.
Here are some more packages that provide a setup hook. Since the list of
hooks is extensible, this is not an exhaustive list the mechanism is only to
be used as a last resort, it might cover most uses.
<variablelist>
<varlistentry>
<term>
@ -2499,11 +2511,11 @@ addEnvHooks "$hostOffset" myBashFunction
<listitem>
<para>
The <varname>autoreconfHook</varname> derivation adds
<varname>autoreconfPhase</varname>, which runs autoreconf, libtoolize and
automake, essentially preparing the configure script in autotools-based
builds. Most autotools-based packages come with the configure script
pre-generated, but this hook is necessary for a few packages and when you
need to patch the package’s configure scripts.
<varname>autoreconfPhase</varname>, which runs autoreconf, libtoolize
and automake, essentially preparing the configure script in
autotools-based builds. Most autotools-based packages come with the
configure script pre-generated, but this hook is necessary for a few
packages and when you need to patch the package’s configure scripts.
</para>
</listitem>
</varlistentry>
@ -2547,9 +2559,9 @@ addEnvHooks "$hostOffset" myBashFunction
</term>
<listitem>
<para>
Exports <envar>GDK_PIXBUF_MODULE_FILE</envar> environment variable to the
builder. Add librsvg package to <varname>buildInputs</varname> to get svg
support.
Exports <envar>GDK_PIXBUF_MODULE_FILE</envar> environment variable to
the builder. Add librsvg package to <varname>buildInputs</varname> to
get svg support.
</para>
</listitem>
</varlistentry>
@ -2595,14 +2607,13 @@ addEnvHooks "$hostOffset" myBashFunction
<para>
This is useful for programs that use <citerefentry>
<refentrytitle>dlopen</refentrytitle>
<manvolnum>3</manvolnum>
</citerefentry> to load libraries at runtime.
<manvolnum>3</manvolnum> </citerefentry> to load libraries at runtime.
</para>
<para>
In certain situations you may want to run the main command
(<command>autoPatchelf</command>) of the setup hook on a file or a set
of directories instead of unconditionally patching all outputs. This
can be done by setting the <envar>dontAutoPatchelf</envar> environment
of directories instead of unconditionally patching all outputs. This can
be done by setting the <envar>dontAutoPatchelf</envar> environment
variable to a non-empty value.
</para>
<para>
@ -2619,22 +2630,22 @@ addEnvHooks "$hostOffset" myBashFunction
<listitem>
<para>
This hook will make a build pause instead of stopping when a failure
happens. It prevents nix from cleaning up the build environment immediately and
allows the user to attach to a build environment using the
<command>cntr</command> command. Upon build error it will print
instructions on how to use <command>cntr</command>. Installing
cntr and running the command will provide shell access to the build
sandbox of failed build. At <filename>/var/lib/cntr</filename> the
sandboxed filesystem is mounted. All commands and files of the system are
still accessible within the shell. To execute commands from the sandbox
use the cntr exec subcommand. Note that <command>cntr</command> also
needs to be executed on the machine that is doing the build, which might
not be the case when remote builders are enabled.
<command>cntr</command> is only supported on Linux-based platforms. To
use it first add <literal>cntr</literal> to your
<literal>environment.systemPackages</literal> on NixOS or alternatively to
the root user on non-NixOS systems. Then in the package that is supposed
to be inspected, add <literal>breakpointHook</literal> to
happens. It prevents nix from cleaning up the build environment
immediately and allows the user to attach to a build environment using
the <command>cntr</command> command. Upon build error it will print
instructions on how to use <command>cntr</command>. Installing cntr and
running the command will provide shell access to the build sandbox of
failed build. At <filename>/var/lib/cntr</filename> the sandboxed
filesystem is mounted. All commands and files of the system are still
accessible within the shell. To execute commands from the sandbox use
the cntr exec subcommand. Note that <command>cntr</command> also needs
to be executed on the machine that is doing the build, which might not
be the case when remote builders are enabled. <command>cntr</command> is
only supported on Linux-based platforms. To use it first add
<literal>cntr</literal> to your
<literal>environment.systemPackages</literal> on NixOS or alternatively
to the root user on non-NixOS systems. Then in the package that is
supposed to be inspected, add <literal>breakpointHook</literal> to
<literal>nativeBuildInputs</literal>.
<programlisting>
nativeBuildInputs = [ breakpointHook ];
@ -2650,14 +2661,13 @@ addEnvHooks "$hostOffset" myBashFunction
</term>
<listitem>
<para>
A few libraries automatically add to
<literal>NIX_LDFLAGS</literal> their library, making their
symbols automatically available to the linker. This includes
libiconv and libintl (gettext). This is done to provide
compatibility between GNU Linux, where libiconv and libintl
are bundled in, and other systems where that might not be the
case. Sometimes, this behavior is not desired. To disable
this behavior, set <literal>dontAddExtraLibs</literal>.
A few libraries automatically add to <literal>NIX_LDFLAGS</literal>
their library, making their symbols automatically available to the
linker. This includes libiconv and libintl (gettext). This is done to
provide compatibility between GNU Linux, where libiconv and libintl are
bundled in, and other systems where that might not be the case.
Sometimes, this behavior is not desired. To disable this behavior, set
<literal>dontAddExtraLibs</literal>.
</para>
</listitem>
</varlistentry>
@ -2668,15 +2678,15 @@ addEnvHooks "$hostOffset" myBashFunction
<listitem>
<para>
Overrides the default configure phase to run the CMake command. By
default, we use the Make generator of CMake. In
addition, dependencies are added automatically to CMAKE_PREFIX_PATH so
that packages are correctly detected by CMake. Some additional flags
are passed in to give similar behavior to configure-based packages. You
can disable this hook’s behavior by setting configurePhase to a custom
value, or by setting dontUseCmakeConfigure. cmakeFlags controls flags
passed only to CMake. By default, parallel building is enabled as CMake
supports parallel building almost everywhere. When Ninja is also in
use, CMake will detect that and use the ninja generator.
default, we use the Make generator of CMake. In addition, dependencies
are added automatically to CMAKE_PREFIX_PATH so that packages are
correctly detected by CMake. Some additional flags are passed in to give
similar behavior to configure-based packages. You can disable this
hook’s behavior by setting configurePhase to a custom value, or by
setting dontUseCmakeConfigure. cmakeFlags controls flags passed only to
CMake. By default, parallel building is enabled as CMake supports
parallel building almost everywhere. When Ninja is also in use, CMake
will detect that and use the ninja generator.
</para>
</listitem>
</varlistentry>
@ -2689,8 +2699,8 @@ addEnvHooks "$hostOffset" myBashFunction
Overrides the build and install phases to run the “xcbuild” command.
This hook is needed when a project only comes with build files for the
XCode build system. You can disable this behavior by setting buildPhase
and configurePhase to a custom value. xcbuildFlags controls flags
passed only to xcbuild.
and configurePhase to a custom value. xcbuildFlags controls flags passed
only to xcbuild.
</para>
</listitem>
</varlistentry>
@ -2703,8 +2713,8 @@ addEnvHooks "$hostOffset" myBashFunction
Overrides the configure phase to run meson to generate Ninja files. You
can disable this behavior by setting configurePhase to a custom value,
or by setting dontUseMesonConfigure. To run these files, you should
accompany meson with ninja. mesonFlags controls only the flags passed
to meson. By default, parallel building is enabled as Meson supports
accompany meson with ninja. mesonFlags controls only the flags passed to
meson. By default, parallel building is enabled as Meson supports
parallel building almost everywhere.
</para>
</listitem>