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Bas van Dijk 58ea28eb2c lib: allow sourceByRegex to be composed after cleanSourceWith
`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
```
2019-07-19 16:23:11 +02:00
.github Update FUNDING.yml 2019-07-17 14:22:24 +02:00
doc Merge master into staging-next 2019-07-13 09:45:40 +02:00
lib lib: allow sourceByRegex to be composed after cleanSourceWith 2019-07-19 16:23:11 +02:00
maintainers Change maintainter's name 2019-07-19 09:21:18 +02:00
nixos nixos/doc: fix build 2019-07-18 20:40:24 -04:00
pkgs gnome3.gnome-getting-started-docs: 3.32.1 -> 3.32.2 (#65073) 2019-07-19 14:45:17 +02:00
.editorconfig Revert ".version: remove final newline" 2018-04-28 14:23:13 +02:00
.gitattributes gitattributes: disable merge=union in all-packages 2018-03-27 11:03:03 -05:00
.gitignore Replace androidenv by new implementation 2018-12-18 21:16:06 +01:00
.version 19.09 is Loris. 2019-02-25 23:21:14 +01:00
COPYING COPYING: include 2019 2019-03-18 19:55:33 -07:00
default.nix Fix local path to release notes in error message 2018-10-08 05:43:15 -05:00
README.md README: add open collective badge 2019-07-17 14:27:28 +02:00

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Nixpkgs is a collection of packages for the Nix package manager. It is periodically built and tested by the Hydra build daemon as so-called channels. To get channel information via git, add nixpkgs-channels as a remote:

% git remote add channels https://github.com/NixOS/nixpkgs-channels.git

For stability and maximum binary package support, it is recommended to maintain custom changes on top of one of the channels, e.g. nixos-19.03 for the latest release and nixos-unstable for the latest successful build of master:

% git remote update channels
% git rebase channels/nixos-19.03

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