The existing knot-tying code I felt was a bit incoherent with result, finalReturn, self, refering to different various forms of the "haskellPackages" value and often
different forms in the same place.
This commit instills some object-oriented discipline to the construction of hasekllPackages using a small number of fundamental OO concepts:
* An class is a open recursive function of the form (self : fooBody) where fooBody is a set.
* An instance of a class is the fixed point of the class.
This value is sometimes refered to as an object and the values in the resulting set are sometimes refered to as methods.
* A class, foo = self : fooBody, can be extended by an extension which is a function bar = (self : super : barBody) where barBody a set of overrides for fooBody.
The result of a class extension is a new class whose value is self : foo self // bar self (foo self).
The super parameter gives access to the original methods that barBody may be overriding.
This commit turns the haskell-packages value into a "class".
The knot-tying, a.k.a the object instanitation, is moved into haskells-defaults. The "finalReturn" is no longer needed and is eliminated from the body of
haskell-packages. All the work done by prefFun is moved to haskell-defaults, so that parameter is eliminated form haskell-packages. Notice that the old prefFun took
two pameters named "self" and "super", but both parameters got passed the same value "result". There seems to have been some confusion in the old code.
Inside haskell-defaults, the haskell-packages class is extended twice before instantiation. The first extension is done using prefFun argument.
The second extension is done the extension argument, which is a renamed version of extraPrefs.
This two stage approach means that extension's super gets access to the post "perfFun" object while previously the extraPrefs only had access to the pre "prefFun"
object. Also the extension function has access to both the super (post "perfFun") object and to self, the final object. With extraPrefs, one needed to use the
"finalReturn" of the haskell packages to get access to the final object. Due to significant changes in semantics, I thought it best to replace extraPrefs with
extension so that people using extraPrefs know to update thier cod.
Lastly, all the Prefs functions have renamed the "self" parameter to "super". This is because "self" was never actually a self-reference in the object oriented sense
of the word. For example
Cabal_1_18_1_3 = self.Cabal_1_18_1_3.override { deepseq = self.deepseq_1_3_0_2; };
doesn't actually make sense from an object oriented standpoint because, barring further method overriding, the value of Cabal_1_18_1_3 would be trying to override it's
own value which simply causes a loop exception. Thankfully all these uses of self were really uses of super:
Cabal_1_18_1_3 = super.Cabal_1_18_1_3.override { deepseq = super.deepseq_1_3_0_2; };
In this notation the overriden Cabal_1_18_1_3 method calls the Cabal_1_18_1_3 of the super-class, which is a well-founded notion.
Below is an example use of using "extension" parameter
{
packageOverrides = pkgs : {
testHaskellPackages = pkgs.haskellPackages.override {
extension = self : super : {
transformers_0_4_1_0 = self.cabal.mkDerivation (pkgs: {
pname = "transformers";
version = "0.4.1.0";
sha256 = "0jlnz86f87jndv4sifg1zpv5b2g2cxy1x2575x727az6vyaarwwg";
meta = {
description = "Concrete functor and monad transformers";
license = pkgs.stdenv.lib.licenses.bsd3;
platforms = pkgs.ghc.meta.platforms;
maintainers = [ pkgs.stdenv.lib.maintainers.andres ];
};
});
transformers = self.transformers_0_4_1_0;
lensFamilyCore = super.lensFamilyCore.override { transformers = self.transformers_0_3_0_0; };
};
};
};
}
Notice the use of self in the body of the override of the transformers method which references the newly defined transformers_0_4_1_0 method.
With the previous code, one would have to instead akwardly write
transformers = super.finalReturn.transformers_0_4_1_0;
or use a rec clause, which would prevent futher overriding of transformers_0_4_1_0.
This should make it easier to enable proprietary pepper API plugins
though nixpkgs config, so it can be easily installed using something
like:
nix-env -i chromium-stable
With something like:
{ chromium.enablePepperFlash = true; }
In ~/.nixpkgs/config.nix to enable pepper API based Flash and to avoid
the browser wrapper from Firefox entirely.
Signed-off-by: aszlig <aszlig@redmoonstudios.org>
This is a small wrapper around fetchzip. It allows you to say:
src = fetchGitHub {
owner = "NixOS";
repo = "nix";
rev = "924e19341a5ee488634bc9ce1ea9758ac496afc3"; # or a tag
sha256 = "1ld1jc26wy0smkg63chvdzsppfw6zy1ykf3mmc50hkx397wcbl09";
};
This function downloads and unpacks a file in one fixed-output
derivation. This is primarily useful for dynamically generated zip
files, such as GitHub's /archive URLs, where the unpacked content of
the zip file doesn't change, but the zip file itself may (e.g. due to
minor changes in the compression algorithm, or changes in timestamps).
Fetchzip is implemented by extending fetchurl with a "postFetch" hook
that is executed after the file has been downloaded. This hook can
thus perform arbitrary checks or transformations on the downloaded
file.
COPRTHR is a very excellent little SDK implementing OpenCL and related
tech for regular multicore processors, as well as things like my new
Parallella (along with remote/networked OpenCL compute support).
Signed-off-by: Austin Seipp <aseipp@pobox.com>
This allows fonts to be installed from anywhere in an unzipped file
rather than having to cd deep into the directory and come back out in
order for e.g. `forceCopy` to work correctly.
This ensures that the intermediate machine is shut down only after the
migration has finished writing the memory dump to disk, to ensure we
don't end up with empty state files depending on how fast the migration
finished before we actually shut down the VM.
Signed-off-by: aszlig <aszlig@redmoonstudios.org>
This ensures that the builder isn't waiting forever if the Windows VM
drops dead while we're waiting for the controller VM to signal that a
particular command has been executed on the Windows VM. It won't ever
happen in such cases so it doesn't make sense to wait for the timeout.
Signed-off-by: aszlig <aszlig@redmoonstudios.org>
allows to write neat expressions like (as we're still generating an
expression string):
```
{
build = haskellPackages.buildLocalCabalWithArgs {
inherit src name;
cabalDrvArgs = {
jailbreak = false;
doCheck = false;
};
};
}
```
without resorting to weird kung-fu like darcs does:
```
darcs = haskellPackages.darcs.override {
# A variant of the Darcs derivation that containts only the
# executable and
# thus has no dependencies on other Haskell packages.
cabal = { mkDerivation = x: rec { final = haskellPackages.cabal.mkDerivation (self: (x final) // {
isLibrary = false;
configureFlags = "-f-library"; }); }.final;
};
};
```
While here, move the `jailbreak = true;` as the default `cabalDrvArgs`
option.
The whole notion of per-compiler HP-compliant environments has failed
anyway and I'll try to get rid of that ASAP, so it feels pointless to
configure that stuff for GHC 7.8.2 to begin with.
This fixes build for version 36, which i accidentally broke in commit
f6e31fadd8.
The reason this happened, was that my Hydra didn't pick up the latest
commit and I actually tested and built the parent commit instead of the
update commit.
So, this commit is the real "builds fine, tested" for all channels.
Also, the sandbox client initalization has moved into
setuid_sandbox_client.cc, so we need to move the lookup of the
CHROMIUM_SANDBOX_BINARY_PATH environment variable there.
Signed-off-by: aszlig <aszlig@redmoonstudios.org>
The system attribute was already there in the function head of the
shared update helper but it actually wasn't used and thus later the
import of <nixpkgs> was done using builtins.currentSystem instead of the
system attribute inherited from the source derivation.
Now we correctly propagate the attribute, so that even when running a
64bit kernel you can run a 32bit Chromium with binary plugins.
Signed-off-by: aszlig <aszlig@redmoonstudios.org>
systemd-tmpfiles-setup.service pulls in local-fs.target, which
interferes with NixOps' send-keys feature (since sshd.service depends
indirectly on sysinit.target). Since in NixOS we don't use
systemd-tmpfiles for creating files (that's done by activation scripts
and preStart scripts), it's not a problem to start it a bit later.
Backport: 14.04
