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* New primop builtins.filterSource, which can be used to filter files

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from a source directory.  All files for which a predicate function
  returns true are copied to the store.  Typical example is to leave
  out the .svn directory:

    stdenv.mkDerivation {
      ...
      src = builtins.filterSource
        (path: baseNameOf (toString path) != ".svn")
        ./source-dir;
      # as opposed to
      #   src = ./source-dir;
    }

  This is important because the .svn directory influences the hash in
  a rather unpredictable and variable way.
This commit is contained in:
Eelco Dolstra 2006-12-12 23:05:01 +00:00
parent b438d37558
commit a3e6415ba8
19 changed files with 143 additions and 68 deletions
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5
src/libutil/hash.hh
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@ -69,7 +69,10 @@ Hash hashFile(HashType ht, const Path & path);
/* Compute the hash of the given path. The hash is defined as
(essentially) hashString(ht, dumpPath(path)). */
Hash hashPath(HashType ht, const Path & path);
struct PathFilter;
extern PathFilter defaultPathFilter;
Hash hashPath(HashType ht, const Path & path,
PathFilter & filter = defaultPathFilter);
/* Compress a hash to the specified number of bytes by cyclically
XORing bytes together. */