nixpkgs/pkgs/build-support/fetchpatch/default.nix
Franz Pletz 7e8b3adb04 fetchpatch: add addPrefixes argument
Sometimes patches start without a leading prefix. We default to strip
one prefix or path component from patches (-p1) in the patchPhase in
stdenv.

As all patches should therefore be in this format, fetchpatch should
have an option to normalize patch paths. This commit introduces a new
argument to fetchpatch called addPrefixes that adds one patch prefix to
the old and new paths in a patch before putting it into the store.
2016-07-29 12:03:08 +02:00

28 lines
924 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.
{ lib, fetchurl, patchutils }:
{ stripLen ? 0, addPrefixes ? false, ... }@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} \
${lib.optionalString addPrefixes ''
--addoldprefix=a/ \
--addnewprefix=b/ \
''} \
--clean "$out" > "$tmpfile"
mv "$tmpfile" "$out"
${args.postFetch or ""}
'';
} // builtins.removeAttrs args ["stripLen" "addPrefixes"])