94 lines
3 KiB
Nix
94 lines
3 KiB
Nix
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# 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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{ relative ? null
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, stripLen ? 0
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, decode ? "cat" # custom command to decode patch e.g. base64 -d
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, extraPrefix ? null
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, excludes ? []
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, includes ? []
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, revert ? false
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, postFetch ? ""
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, ...
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}@args:
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let
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args' = if relative != null then {
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stripLen = 1 + lib.length (lib.splitString "/" relative) + stripLen;
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extraPrefix = lib.optionalString (extraPrefix != null) extraPrefix;
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} else {
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inherit stripLen extraPrefix;
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};
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in let
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inherit (args') stripLen extraPrefix;
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in
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lib.throwIfNot (excludes == [] || includes == [])
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"fetchpatch: cannot use excludes and includes simultaneously"
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fetchurl ({
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postFetch = ''
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tmpfile="$TMPDIR/patch"
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if [ ! -s "$out" ]; then
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echo "error: Fetched patch file '$out' is empty!" 1>&2
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exit 1
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fi
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set +e
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${decode} < "$out" > "$tmpfile"
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if [ $? -ne 0 ] || [ ! -s "$tmpfile" ]; then
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echo 'Failed to decode patch with command "'${lib.escapeShellArg decode}'"' >&2
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echo 'Fetched file was (limited to 128 bytes):' >&2
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od -A x -t x1z -v -N 128 "$out" >&2
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exit 1
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fi
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set -e
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mv "$tmpfile" "$out"
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"${patchutils}/bin/lsdiff" \
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${lib.optionalString (relative != null) "-p1 -i ${lib.escapeShellArg relative}/'*'"} \
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"$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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${lib.optionalString (extraPrefix != null) ''
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--addoldprefix=a/${lib.escapeShellArg extraPrefix} \
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--addnewprefix=b/${lib.escapeShellArg extraPrefix} \
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''} \
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--clean "$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 '$out' is empty (while the original patch file was not)!" 1>&2
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echo "Check your includes and excludes." 1>&2
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echo "Normalized patch file was:" 1>&2
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cat "$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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'' + postFetch;
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} // builtins.removeAttrs args [
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"relative" "stripLen" "decode" "extraPrefix" "excludes" "includes" "revert"
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"postFetch"
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])
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