forked from mirrors/nixpkgs
31 lines
1 KiB
Nix
31 lines
1 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, patchutils }:
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{ stripLen ? 0, addPrefixes ? false, excludes ? [], ... }@args:
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fetchurl ({
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postFetch = ''
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tmpfile="$TMPDIR/${args.sha256}"
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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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${lib.optionalString addPrefixes ''
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--addoldprefix=a/ \
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--addnewprefix=b/ \
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''} \
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--clean "$out" > "$tmpfile"
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${patchutils}/bin/filterdiff \
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-p1 \
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${builtins.toString (builtins.map (x: "-x ${x}") excludes)} \
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"$tmpfile" > "$out"
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${args.postFetch or ""}
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'';
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} // builtins.removeAttrs args ["stripLen" "addPrefixes" "excludes"])
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