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lib: allow sourceByRegex to be composed after cleanSourceWith

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`sourceByRegex src regexes` should include a source file if one of the
regular expressions `regexes` matches the path of that file relative
to `src`.

However to compute this relative path `sourceByRegex` uses:

```
relPath = lib.removePrefix (toString src + "/") (toString path);
```

Note that `toString path` evaluates to an absolute file somewhere
under `src` and not under `/nix/store`.

The problem is that this doesn't work if `src` is a `cleanSourceWith`
invocation as well because `toString src` will then evaluate to
`src.outPath` which will evaluate to `builtins.filterSource ...` which
evaluates to a path in `/nix/store` which is not a prefix of `path`.

The solution is to replace `src` with `origSrc` where

```
origSrc = if isFiltered then src.origSrc else src;
isFiltered = src ? _isLibCleanSourceWith;
```

Test this by executing the following from the nixpkgs repo:

```
(cat << 'EOI'
let
  pkgs = import ./. {};
in pkgs.runCommand "test-sourceByRegex" {
  test_sourceByRegex =
    let
      src1 = pkgs.lib.sourceByRegex ./.  [ "^test-sourceByRegex.nix$" ];
      src2 = pkgs.lib.sourceByRegex src1 [ "^test-sourceByRegex.nix$" ];
    in src2 + "/test-sourceByRegex.nix";
} ''
 cp $test_sourceByRegex $out
''
EOI
) > test-sourceByRegex.nix
nix-build test-sourceByRegex.nix
```
This commit is contained in:
Bas van Dijk 2019-07-19 16:23:11 +02:00
parent 663542ad04
commit 58ea28eb2c
1 changed files with 10 additions and 6 deletions
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16
lib/sources.nix
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@ -53,12 +53,16 @@ rec {
# Filter sources by a list of regular expressions.
#
# E.g. `src = sourceByRegex ./my-subproject [".*\.py$" "^database.sql$"]`
sourceByRegex = src: regexes: cleanSourceWith {
filter = (path: type:
let relPath = lib.removePrefix (toString src + "/") (toString path);
in lib.any (re: builtins.match re relPath != null) regexes);
inherit src;
};
sourceByRegex = src: regexes:
let
isFiltered = src ? _isLibCleanSourceWith;
origSrc = if isFiltered then src.origSrc else src;
in lib.cleanSourceWith {
filter = (path: type:
let relPath = lib.removePrefix (toString origSrc + "/") (toString path);
in lib.any (re: builtins.match re relPath != null) regexes);
inherit src;
};
# Get all files ending with the specified suffices from the given
# directory or its descendants. E.g. `sourceFilesBySuffices ./dir