nixpkgs/pkgs/build-support/fetchpatch/default.nix
Vladimír Čunát 137eae0b55 Merge #2630: add and use fetchpatch
fetchpatch is fetchurl that determinizes the patch.
Some parts of generated patches change from time to time, e.g. see #1983 and
http://comments.gmane.org/gmane.linux.distributions.nixos/12815
Using fetchpatch should prevent the hash from changing.

Conflicts (auto-solved):
	pkgs/development/libraries/haskell/gitit/default.nix
2014-05-17 07:31:03 +02:00

23 lines
702 B
Nix

# This function downloads and normalizes a patch/diff file.
# This is primarily useful for dynamically generated patches,
# such as GitHub's or cgit's, where the non-significant content parts
# often change with updating of git or cgit.
# stripLen acts as the -p parameter when applying a patch.
{ fetchurl, patchutils }:
{ stripLen ? 0, ... }@args:
fetchurl ({
postFetch = ''
tmpfile="$TMPDIR/${args.sha256}"
"${patchutils}/bin/lsdiff" "$out" \
| sort -u | sed -e 's/[*?]/\\&/g' \
| xargs -I{} \
"${patchutils}/bin/filterdiff" \
--include={} \
--strip=${toString stripLen} \
--clean "$out" > "$tmpfile"
mv "$tmpfile" "$out"
'';
} // args)