284 lines
9.4 KiB
Nix
284 lines
9.4 KiB
Nix
{ lib }:
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let
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inherit (import ./internal.nix { inherit lib; })
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_coerce
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_coerceMany
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_toSourceFilter
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_unionMany
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;
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inherit (builtins)
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isList
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isPath
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pathExists
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typeOf
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;
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inherit (lib.lists)
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imap0
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;
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inherit (lib.path)
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hasPrefix
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splitRoot
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;
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inherit (lib.strings)
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isStringLike
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;
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inherit (lib.filesystem)
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pathType
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;
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inherit (lib.sources)
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cleanSourceWith
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;
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in {
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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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The result is the store path as a string-like value, making it usable e.g. as the `src` of a derivation, or in string interpolation:
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```nix
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stdenv.mkDerivation {
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src = lib.fileset.toSource { ... };
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# ...
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}
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```
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The name of the store path is always `source`.
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Type:
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toSource :: {
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root :: Path,
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fileset :: FileSet,
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} -> SourceLike
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Example:
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# Import the current directory into the store
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# but only include files under ./src
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toSource {
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root = ./.;
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fileset = ./src;
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}
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=> "/nix/store/...-source"
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# Import the current directory into the store
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# but only include ./Makefile and all files under ./src
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toSource {
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root = ./.;
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fileset = union
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./Makefile
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./src;
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}
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=> "/nix/store/...-source"
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# Trying to include a file outside the root will fail
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toSource {
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root = ./.;
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fileset = unions [
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./Makefile
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./src
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../LICENSE
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];
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}
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=> <error>
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# The root needs to point to a directory that contains all the files
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toSource {
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root = ../.;
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fileset = unions [
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./Makefile
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./src
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../LICENSE
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];
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}
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=> "/nix/store/...-source"
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# The root has to be a local filesystem path
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toSource {
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root = "/nix/store/...-source";
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fileset = ./.;
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}
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=> <error>
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*/
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toSource = {
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/*
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(required) The local directory [path](https://nixos.org/manual/nix/stable/language/values.html#type-path) that will correspond to the root of the resulting store path.
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Paths in [strings](https://nixos.org/manual/nix/stable/language/values.html#type-string), including Nix store paths, cannot be passed as `root`.
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`root` has to be a directory.
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<!-- Ignore the indentation here, this is a nixdoc rendering bug that needs to be fixed -->
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:::{.note}
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Changing `root` only affects the directory structure of the resulting store path, it does not change which files are added to the store.
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The only way to change which files get added to the store is by changing the `fileset` attribute.
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:::
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*/
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root,
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/*
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(required) The file set whose files to import into the store.
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File sets can be created using other functions in this library.
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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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<!-- Ignore the indentation here, this is a nixdoc rendering bug that needs to be fixed -->
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:::{.note}
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If a directory does not recursively contain any file, it is omitted from the store path contents.
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:::
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*/
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fileset,
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}:
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let
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# We cannot rename matched attribute arguments, so let's work around it with an extra `let in` statement
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maybeFileset = fileset;
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in
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let
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fileset = _coerce "lib.fileset.toSource: `fileset`" maybeFileset;
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rootFilesystemRoot = (splitRoot root).root;
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filesetFilesystemRoot = (splitRoot fileset._internalBase).root;
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filter = _toSourceFilter fileset;
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in
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if ! isPath root then
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if isStringLike root then
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throw ''
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lib.fileset.toSource: `root` "${toString root}" is a string-like value, but it should be a path instead.
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Paths in strings are not supported by `lib.fileset`, use `lib.sources` or derivations instead.''
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else
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throw ''
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lib.fileset.toSource: `root` is of type ${typeOf root}, but it should be a path instead.''
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# Currently all Nix paths have the same filesystem root, but this could change in the future.
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# See also ../path/README.md
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else if rootFilesystemRoot != filesetFilesystemRoot then
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throw ''
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lib.fileset.toSource: Filesystem roots are not the same for `fileset` and `root` "${toString root}":
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`root`: root "${toString rootFilesystemRoot}"
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`fileset`: root "${toString filesetFilesystemRoot}"
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Different roots are not supported.''
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else if ! pathExists root then
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throw ''
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lib.fileset.toSource: `root` ${toString root} does not exist.''
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else if pathType root != "directory" then
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throw ''
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lib.fileset.toSource: `root` ${toString root} is a file, but it should be a directory instead. Potential solutions:
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- If you want to import the file into the store _without_ a containing directory, use string interpolation or `builtins.path` instead of this function.
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- If you want to import the file into the store _with_ a containing directory, set `root` to the containing directory, such as ${toString (dirOf root)}, and set `fileset` to the file path.''
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else if ! hasPrefix root fileset._internalBase then
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throw ''
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lib.fileset.toSource: `fileset` could contain files in ${toString fileset._internalBase}, which is not under the `root` ${toString root}. Potential solutions:
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- Set `root` to ${toString fileset._internalBase} or any directory higher up. This changes the layout of the resulting store path.
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- Set `fileset` to a file set that cannot contain files outside the `root` ${toString root}. This could change the files included in the result.''
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else
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builtins.seq filter
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cleanSourceWith {
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name = "source";
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src = root;
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inherit filter;
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};
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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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but takes just two file sets instead of a list.
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See also [Union (set theory)](https://en.wikipedia.org/wiki/Union_(set_theory)).
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The given file sets are evaluated as lazily as possible,
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with the first argument being evaluated first if needed.
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Type:
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union :: FileSet -> FileSet -> FileSet
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Example:
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# Create a file set containing the file `Makefile`
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# and all files recursively in the `src` directory
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union ./Makefile ./src
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# Create a file set containing the file `Makefile`
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# and the LICENSE file from the parent directory
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union ./Makefile ../LICENSE
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*/
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union =
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# The first file set.
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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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fileset1:
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# The second file set.
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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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fileset2:
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let
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filesets = _coerceMany "lib.fileset.union" [
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{
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context = "first argument";
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value = fileset1;
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}
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{
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context = "second argument";
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value = fileset2;
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}
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];
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in
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_unionMany filesets;
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/*
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The file set containing all files that are in any of the given file sets.
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This is the same as [`union`](#function-library-lib.fileset.unions),
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but takes a list of file sets instead of just two.
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See also [Union (set theory)](https://en.wikipedia.org/wiki/Union_(set_theory)).
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The given file sets are evaluated as lazily as possible,
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with earlier elements being evaluated first if needed.
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Type:
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unions :: [ FileSet ] -> FileSet
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Example:
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# Create a file set containing selected files
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unions [
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# Include the single file `Makefile` in the current directory
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# This errors if the file doesn't exist
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./Makefile
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# Recursively include all files in the `src/code` directory
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# If this directory is empty this has no effect
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./src/code
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# Include the files `run.sh` and `unit.c` from the `tests` directory
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./tests/run.sh
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./tests/unit.c
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# Include the `LICENSE` file from the parent directory
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../LICENSE
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]
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*/
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unions =
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# A list of file sets.
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# Must contain at least 1 element.
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# The elements can also be paths,
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# which get [implicitly coerced to file sets](#sec-fileset-path-coercion).
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filesets:
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let
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# We cannot rename matched attribute arguments, so let's work around it with an extra `let in` statement
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maybeFilesets = filesets;
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in
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let
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# Annotate the elements with context, used by _coerceMany for better errors
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annotated = imap0 (i: el: {
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context = "element ${toString i} of the argument";
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value = el;
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}) maybeFilesets;
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filesets = _coerceMany "lib.fileset.unions" annotated;
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in
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if ! isList maybeFilesets then
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throw "lib.fileset.unions: Expected argument to be a list, but got a ${typeOf maybeFilesets}."
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else if maybeFilesets == [ ] then
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# TODO: This could be supported, but requires an extra internal representation for the empty file set
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throw "lib.fileset.unions: Expected argument to be a list with at least one element, but it contains no elements."
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else
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_unionMany filesets;
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}
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