Merge pull request #268408 from tweag/fileset.reference
This commit is contained in:
Valentin Gagarin
GitHub
commit
4ce484e288
@ -3,10 +3,52 @@
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[]{#sec-fileset}
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The [`lib.fileset`](#sec-functions-library-fileset) library allows you to work with _file sets_.
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A file set is a mathematical set of local files that can be added to the Nix store for use in Nix derivations.
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A file set is a (mathematical) set of local files that can be added to the Nix store for use in Nix derivations.
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File sets are easy and safe to use, providing obvious and composable semantics with good error messages to prevent mistakes.
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See the [function reference](#sec-functions-library-fileset) for function-specific documentation.
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## Overview {#sec-fileset-overview}
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Basics:
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- [Implicit coercion from paths to file sets](#sec-fileset-path-coercion)
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- [`lib.fileset.trace`](#function-library-lib.fileset.trace)/[`lib.fileset.traceVal`](#function-library-lib.fileset.trace):
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Pretty-print file sets for debugging.
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- [`lib.fileset.toSource`](#function-library-lib.fileset.toSource):
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Add files in file sets to the store to use as derivation sources.
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Combinators:
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- [`lib.fileset.union`](#function-library-lib.fileset.union)/[`lib.fileset.unions`](#function-library-lib.fileset.unions):
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Create a larger file set from all the files in multiple file sets.
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- [`lib.fileset.intersection`](#function-library-lib.fileset.intersection):
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Create a smaller file set from only the files in both file sets.
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- [`lib.fileset.difference`](#function-library-lib.fileset.difference):
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Create a smaller file set containing all files that are in one file set, but not another one.
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Filtering:
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- [`lib.fileset.fileFilter`](#function-library-lib.fileset.fileFilter):
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Create a file set from all files that satisisfy a predicate in a directory.
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Utilities:
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- [`lib.fileset.fromSource`](#function-library-lib.fileset.fromSource):
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Create a file set from a `lib.sources`-based value.
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- [`lib.fileset.gitTracked`](#function-library-lib.fileset.gitTracked)/[`lib.fileset.gitTrackedWith`](#function-library-lib.fileset.gitTrackedWith):
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Create a file set from all tracked files in a local Git repository.
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If you need more file set functions,
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see [this issue](https://github.com/NixOS/nixpkgs/issues/266356) to request it.
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## Implicit coercion from paths to file sets {#sec-fileset-path-coercion}
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@ -106,6 +148,96 @@ let
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in {
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/*
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Incrementally evaluate and trace a file set in a pretty way.
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This function is only intended for debugging purposes.
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The exact tracing format is unspecified and may change.
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This function takes a final argument to return.
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In comparison, [`traceVal`](#function-library-lib.fileset.traceVal) returns
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the given file set argument.
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This variant is useful for tracing file sets in the Nix repl.
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Type:
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trace :: FileSet -> Any -> Any
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Example:
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trace (unions [ ./Makefile ./src ./tests/run.sh ]) null
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=>
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trace: /home/user/src/myProject
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trace: - Makefile (regular)
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trace: - src (all files in directory)
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trace: - tests
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trace: - run.sh (regular)
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null
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*/
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trace =
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/*
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The file set to trace.
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This argument can also be a path,
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which gets [implicitly coerced to a file set](#sec-fileset-path-coercion).
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*/
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fileset:
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let
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# "fileset" would be a better name, but that would clash with the argument name,
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# and we cannot change that because of https://github.com/nix-community/nixdoc/issues/76
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actualFileset = _coerce "lib.fileset.trace: Argument" fileset;
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in
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seq
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(_printFileset actualFileset)
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(x: x);
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/*
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Incrementally evaluate and trace a file set in a pretty way.
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This function is only intended for debugging purposes.
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The exact tracing format is unspecified and may change.
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This function returns the given file set.
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In comparison, [`trace`](#function-library-lib.fileset.trace) takes another argument to return.
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This variant is useful for tracing file sets passed as arguments to other functions.
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Type:
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traceVal :: FileSet -> FileSet
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Example:
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toSource {
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root = ./.;
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fileset = traceVal (unions [
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./Makefile
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./src
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./tests/run.sh
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]);
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}
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=>
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trace: /home/user/src/myProject
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trace: - Makefile (regular)
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trace: - src (all files in directory)
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trace: - tests
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trace: - run.sh (regular)
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"/nix/store/...-source"
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*/
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traceVal =
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/*
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The file set to trace and return.
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This argument can also be a path,
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which gets [implicitly coerced to a file set](#sec-fileset-path-coercion).
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*/
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fileset:
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let
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# "fileset" would be a better name, but that would clash with the argument name,
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# and we cannot change that because of https://github.com/nix-community/nixdoc/issues/76
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actualFileset = _coerce "lib.fileset.traceVal: Argument" fileset;
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in
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seq
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(_printFileset actualFileset)
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# We could also return the original fileset argument here,
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# but that would then duplicate work for consumers of the fileset, because then they have to coerce it again
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actualFileset;
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/*
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Add the local files contained in `fileset` to the store as a single [store path](https://nixos.org/manual/nix/stable/glossary#gloss-store-path) rooted at `root`.
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@ -250,75 +382,6 @@ in {
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filter = sourceFilter;
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};
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/*
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Create a file set with the same files as a `lib.sources`-based value.
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This does not import any of the files into the store.
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This can be used to gradually migrate from `lib.sources`-based filtering to `lib.fileset`.
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A file set can be turned back into a source using [`toSource`](#function-library-lib.fileset.toSource).
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:::{.note}
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File sets cannot represent empty directories.
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Turning the result of this function back into a source using `toSource` will therefore not preserve empty directories.
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:::
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Type:
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fromSource :: SourceLike -> FileSet
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Example:
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# There's no cleanSource-like function for file sets yet,
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# but we can just convert cleanSource to a file set and use it that way
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toSource {
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root = ./.;
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fileset = fromSource (lib.sources.cleanSource ./.);
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}
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# Keeping a previous sourceByRegex (which could be migrated to `lib.fileset.unions`),
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# but removing a subdirectory using file set functions
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difference
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(fromSource (lib.sources.sourceByRegex ./. [
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"^README\.md$"
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# This regex includes everything in ./doc
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"^doc(/.*)?$"
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])
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./doc/generated
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# Use cleanSource, but limit it to only include ./Makefile and files under ./src
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intersection
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(fromSource (lib.sources.cleanSource ./.))
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(unions [
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./Makefile
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./src
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]);
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*/
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fromSource = source:
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let
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# This function uses `._isLibCleanSourceWith`, `.origSrc` and `.filter`,
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# which are technically internal to lib.sources,
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# but we'll allow this since both libraries are in the same code base
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# and this function is a bridge between them.
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isFiltered = source ? _isLibCleanSourceWith;
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path = if isFiltered then source.origSrc else source;
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in
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# We can only support sources created from paths
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if ! isPath path then
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if isStringLike path then
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throw ''
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lib.fileset.fromSource: The source origin of the argument is a string-like value ("${toString path}"), but it should be a path instead.
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Sources created from paths in strings cannot be turned into file sets, use `lib.sources` or derivations instead.''
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else
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throw ''
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lib.fileset.fromSource: The source origin of the argument is of type ${typeOf path}, but it should be a path instead.''
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else if ! pathExists path then
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throw ''
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lib.fileset.fromSource: The source origin (${toString path}) of the argument is a path that does not exist.''
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else if isFiltered then
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_fromSourceFilter path source.filter
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else
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# If there's no filter, no need to run the expensive conversion, all subpaths will be included
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_singleton path;
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/*
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The file set containing all files that are in either of two given file sets.
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This is the same as [`unions`](#function-library-lib.fileset.unions),
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@ -411,66 +474,6 @@ in {
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_unionMany
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];
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/*
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Filter a file set to only contain files matching some predicate.
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Type:
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fileFilter ::
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({
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name :: String,
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type :: String,
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...
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} -> Bool)
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-> Path
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-> FileSet
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Example:
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# Include all regular `default.nix` files in the current directory
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fileFilter (file: file.name == "default.nix") ./.
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# Include all non-Nix files from the current directory
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fileFilter (file: ! hasSuffix ".nix" file.name) ./.
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# Include all files that start with a "." in the current directory
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fileFilter (file: hasPrefix "." file.name) ./.
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# Include all regular files (not symlinks or others) in the current directory
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fileFilter (file: file.type == "regular") ./.
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*/
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fileFilter =
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/*
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The predicate function to call on all files contained in given file set.
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A file is included in the resulting file set if this function returns true for it.
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This function is called with an attribute set containing these attributes:
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- `name` (String): The name of the file
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- `type` (String, one of `"regular"`, `"symlink"` or `"unknown"`): The type of the file.
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This matches result of calling [`builtins.readFileType`](https://nixos.org/manual/nix/stable/language/builtins.html#builtins-readFileType) on the file's path.
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Other attributes may be added in the future.
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*/
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predicate:
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# The path whose files to filter
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path:
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if ! isFunction predicate then
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throw ''
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lib.fileset.fileFilter: First argument is of type ${typeOf predicate}, but it should be a function instead.''
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else if ! isPath path then
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if path._type or "" == "fileset" then
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throw ''
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lib.fileset.fileFilter: Second argument is a file set, but it should be a path instead.
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If you need to filter files in a file set, use `intersection fileset (fileFilter pred ./.)` instead.''
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else
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throw ''
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lib.fileset.fileFilter: Second argument is of type ${typeOf path}, but it should be a path instead.''
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else if ! pathExists path then
|
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throw ''
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lib.fileset.fileFilter: Second argument (${toString path}) is a path that does not exist.''
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else
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_fileFilter predicate path;
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/*
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The file set containing all files that are in both of two given file sets.
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See also [Intersection (set theory)](https://en.wikipedia.org/wiki/Intersection_(set_theory)).
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@ -563,94 +566,133 @@ in {
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(elemAt filesets 1);
|
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|
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/*
|
||||
Incrementally evaluate and trace a file set in a pretty way.
|
||||
This function is only intended for debugging purposes.
|
||||
The exact tracing format is unspecified and may change.
|
||||
|
||||
This function takes a final argument to return.
|
||||
In comparison, [`traceVal`](#function-library-lib.fileset.traceVal) returns
|
||||
the given file set argument.
|
||||
|
||||
This variant is useful for tracing file sets in the Nix repl.
|
||||
Filter a file set to only contain files matching some predicate.
|
||||
|
||||
Type:
|
||||
trace :: FileSet -> Any -> Any
|
||||
fileFilter ::
|
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({
|
||||
name :: String,
|
||||
type :: String,
|
||||
...
|
||||
} -> Bool)
|
||||
-> Path
|
||||
-> FileSet
|
||||
|
||||
Example:
|
||||
trace (unions [ ./Makefile ./src ./tests/run.sh ]) null
|
||||
=>
|
||||
trace: /home/user/src/myProject
|
||||
trace: - Makefile (regular)
|
||||
trace: - src (all files in directory)
|
||||
trace: - tests
|
||||
trace: - run.sh (regular)
|
||||
null
|
||||
*/
|
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trace =
|
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/*
|
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The file set to trace.
|
||||
# Include all regular `default.nix` files in the current directory
|
||||
fileFilter (file: file.name == "default.nix") ./.
|
||||
|
||||
This argument can also be a path,
|
||||
which gets [implicitly coerced to a file set](#sec-fileset-path-coercion).
|
||||
# Include all non-Nix files from the current directory
|
||||
fileFilter (file: ! hasSuffix ".nix" file.name) ./.
|
||||
|
||||
# Include all files that start with a "." in the current directory
|
||||
fileFilter (file: hasPrefix "." file.name) ./.
|
||||
|
||||
# Include all regular files (not symlinks or others) in the current directory
|
||||
fileFilter (file: file.type == "regular") ./.
|
||||
*/
|
||||
fileset:
|
||||
let
|
||||
# "fileset" would be a better name, but that would clash with the argument name,
|
||||
# and we cannot change that because of https://github.com/nix-community/nixdoc/issues/76
|
||||
actualFileset = _coerce "lib.fileset.trace: Argument" fileset;
|
||||
in
|
||||
seq
|
||||
(_printFileset actualFileset)
|
||||
(x: x);
|
||||
fileFilter =
|
||||
/*
|
||||
The predicate function to call on all files contained in given file set.
|
||||
A file is included in the resulting file set if this function returns true for it.
|
||||
|
||||
This function is called with an attribute set containing these attributes:
|
||||
|
||||
- `name` (String): The name of the file
|
||||
|
||||
- `type` (String, one of `"regular"`, `"symlink"` or `"unknown"`): The type of the file.
|
||||
This matches result of calling [`builtins.readFileType`](https://nixos.org/manual/nix/stable/language/builtins.html#builtins-readFileType) on the file's path.
|
||||
|
||||
Other attributes may be added in the future.
|
||||
*/
|
||||
predicate:
|
||||
# The path whose files to filter
|
||||
path:
|
||||
if ! isFunction predicate then
|
||||
throw ''
|
||||
lib.fileset.fileFilter: First argument is of type ${typeOf predicate}, but it should be a function instead.''
|
||||
else if ! isPath path then
|
||||
if path._type or "" == "fileset" then
|
||||
throw ''
|
||||
lib.fileset.fileFilter: Second argument is a file set, but it should be a path instead.
|
||||
If you need to filter files in a file set, use `intersection fileset (fileFilter pred ./.)` instead.''
|
||||
else
|
||||
throw ''
|
||||
lib.fileset.fileFilter: Second argument is of type ${typeOf path}, but it should be a path instead.''
|
||||
else if ! pathExists path then
|
||||
throw ''
|
||||
lib.fileset.fileFilter: Second argument (${toString path}) is a path that does not exist.''
|
||||
else
|
||||
_fileFilter predicate path;
|
||||
|
||||
/*
|
||||
Incrementally evaluate and trace a file set in a pretty way.
|
||||
This function is only intended for debugging purposes.
|
||||
The exact tracing format is unspecified and may change.
|
||||
Create a file set with the same files as a `lib.sources`-based value.
|
||||
This does not import any of the files into the store.
|
||||
|
||||
This function returns the given file set.
|
||||
In comparison, [`trace`](#function-library-lib.fileset.trace) takes another argument to return.
|
||||
This can be used to gradually migrate from `lib.sources`-based filtering to `lib.fileset`.
|
||||
|
||||
This variant is useful for tracing file sets passed as arguments to other functions.
|
||||
A file set can be turned back into a source using [`toSource`](#function-library-lib.fileset.toSource).
|
||||
|
||||
:::{.note}
|
||||
File sets cannot represent empty directories.
|
||||
Turning the result of this function back into a source using `toSource` will therefore not preserve empty directories.
|
||||
:::
|
||||
|
||||
Type:
|
||||
traceVal :: FileSet -> FileSet
|
||||
fromSource :: SourceLike -> FileSet
|
||||
|
||||
Example:
|
||||
# There's no cleanSource-like function for file sets yet,
|
||||
# but we can just convert cleanSource to a file set and use it that way
|
||||
toSource {
|
||||
root = ./.;
|
||||
fileset = traceVal (unions [
|
||||
fileset = fromSource (lib.sources.cleanSource ./.);
|
||||
}
|
||||
|
||||
# Keeping a previous sourceByRegex (which could be migrated to `lib.fileset.unions`),
|
||||
# but removing a subdirectory using file set functions
|
||||
difference
|
||||
(fromSource (lib.sources.sourceByRegex ./. [
|
||||
"^README\.md$"
|
||||
# This regex includes everything in ./doc
|
||||
"^doc(/.*)?$"
|
||||
])
|
||||
./doc/generated
|
||||
|
||||
# Use cleanSource, but limit it to only include ./Makefile and files under ./src
|
||||
intersection
|
||||
(fromSource (lib.sources.cleanSource ./.))
|
||||
(unions [
|
||||
./Makefile
|
||||
./src
|
||||
./tests/run.sh
|
||||
]);
|
||||
}
|
||||
=>
|
||||
trace: /home/user/src/myProject
|
||||
trace: - Makefile (regular)
|
||||
trace: - src (all files in directory)
|
||||
trace: - tests
|
||||
trace: - run.sh (regular)
|
||||
"/nix/store/...-source"
|
||||
*/
|
||||
traceVal =
|
||||
/*
|
||||
The file set to trace and return.
|
||||
|
||||
This argument can also be a path,
|
||||
which gets [implicitly coerced to a file set](#sec-fileset-path-coercion).
|
||||
*/
|
||||
fileset:
|
||||
fromSource = source:
|
||||
let
|
||||
# "fileset" would be a better name, but that would clash with the argument name,
|
||||
# and we cannot change that because of https://github.com/nix-community/nixdoc/issues/76
|
||||
actualFileset = _coerce "lib.fileset.traceVal: Argument" fileset;
|
||||
# This function uses `._isLibCleanSourceWith`, `.origSrc` and `.filter`,
|
||||
# which are technically internal to lib.sources,
|
||||
# but we'll allow this since both libraries are in the same code base
|
||||
# and this function is a bridge between them.
|
||||
isFiltered = source ? _isLibCleanSourceWith;
|
||||
path = if isFiltered then source.origSrc else source;
|
||||
in
|
||||
seq
|
||||
(_printFileset actualFileset)
|
||||
# We could also return the original fileset argument here,
|
||||
# but that would then duplicate work for consumers of the fileset, because then they have to coerce it again
|
||||
actualFileset;
|
||||
# We can only support sources created from paths
|
||||
if ! isPath path then
|
||||
if isStringLike path then
|
||||
throw ''
|
||||
lib.fileset.fromSource: The source origin of the argument is a string-like value ("${toString path}"), but it should be a path instead.
|
||||
Sources created from paths in strings cannot be turned into file sets, use `lib.sources` or derivations instead.''
|
||||
else
|
||||
throw ''
|
||||
lib.fileset.fromSource: The source origin of the argument is of type ${typeOf path}, but it should be a path instead.''
|
||||
else if ! pathExists path then
|
||||
throw ''
|
||||
lib.fileset.fromSource: The source origin (${toString path}) of the argument is a path that does not exist.''
|
||||
else if isFiltered then
|
||||
_fromSourceFilter path source.filter
|
||||
else
|
||||
# If there's no filter, no need to run the expensive conversion, all subpaths will be included
|
||||
_singleton path;
|
||||
|
||||
/*
|
||||
Create a file set containing all [Git-tracked files](https://git-scm.com/book/en/v2/Git-Basics-Recording-Changes-to-the-Repository) in a repository.
|
||||
|
||||
Loading…
Reference in New Issue
Block a user