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nixpkgs/pkgs/build-support/fetchpatch/default.nix
Dan Peebles dd8a42a224 fetchpatch: allow callers to specify postFetch sensibly
Before this fix, it seemed to be trying to merge our postFetch with the
patch normalization logic, but accidentally clobbering the whole thing
with the passed-in value.
2017-10-03 12:48:30 -04:00

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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, excludes ? [], ... }@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"
${patchutils}/bin/filterdiff \
-p1 \
${builtins.toString (builtins.map (x: "-x ${x}") excludes)} \
"$tmpfile" > "$out"
${args.postFetch or ""}
'';
} // builtins.removeAttrs args ["stripLen" "addPrefixes" "excludes" "postFetch"])