61 lines
2.3 KiB
Nix
61 lines
2.3 KiB
Nix
# This function downloads and normalizes a patch/diff file.
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# This is primarily useful for dynamically generated patches,
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# such as GitHub's or cgit's, where the non-significant content parts
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# often change with updating of git or cgit.
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# stripLen acts as the -p parameter when applying a patch.
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{ lib, fetchurl, buildPackages }:
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let
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# 0.3.4 would change hashes: https://github.com/NixOS/nixpkgs/issues/25154
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patchutils = buildPackages.patchutils_0_3_3;
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in
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{ stripLen ? 0, extraPrefix ? null, excludes ? [], includes ? [], revert ? false, ... }@args:
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let
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# Make base-64 encoded SRI hash filename-safe using RFC 4648 §5
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tmpname = lib.replaceStrings [ "+" "/" "=" ] [ "-" "_" "" ] args.sha256;
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in
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fetchurl ({
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postFetch = ''
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tmpfile="$TMPDIR/${tmpname}"
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if [ ! -s "$out" ]; then
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echo "error: Fetched patch file '$out' is empty!" 1>&2
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exit 1
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fi
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"${patchutils}/bin/lsdiff" "$out" \
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| sort -u | sed -e 's/[*?]/\\&/g' \
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| xargs -I{} \
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"${patchutils}/bin/filterdiff" \
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--include={} \
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--strip=${toString stripLen} \
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${lib.optionalString (extraPrefix != null) ''
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--addoldprefix=a/${extraPrefix} \
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--addnewprefix=b/${extraPrefix} \
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''} \
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--clean "$out" > "$tmpfile"
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if [ ! -s "$tmpfile" ]; then
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echo "error: Normalized patch '$tmpfile' is empty (while the fetched file was not)!" 1>&2
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echo "Did you maybe fetch a HTML representation of a patch instead of a raw patch?" 1>&2
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echo "Fetched file was:" 1>&2
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cat "$out" 1>&2
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exit 1
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fi
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${patchutils}/bin/filterdiff \
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-p1 \
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${builtins.toString (builtins.map (x: "-x ${lib.escapeShellArg x}") excludes)} \
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${builtins.toString (builtins.map (x: "-i ${lib.escapeShellArg x}") includes)} \
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"$tmpfile" > "$out"
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if [ ! -s "$out" ]; then
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echo "error: Filtered patch '$out$' is empty (while the original patch file was not)!" 1>&2
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echo "Check your includes and excludes." 1>&2
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echo "Normalizd patch file was:" 1>&2
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cat "$tmpfile" 1>&2
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exit 1
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fi
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'' + lib.optionalString revert ''
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${patchutils}/bin/interdiff "$out" /dev/null > "$tmpfile"
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mv "$tmpfile" "$out"
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'' + (args.postFetch or "");
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meta.broken = excludes != [] && includes != [];
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} // builtins.removeAttrs args ["stripLen" "extraPrefix" "excludes" "includes" "revert" "postFetch"])
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