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Nix
at master
123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127# 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,}:
{ relative ? null, stripLen ? 0, decode ? "cat", # custom command to decode patch e.g. base64 -d extraPrefix ? null, excludes ? [ ], includes ? [ ], hunks ? [ ], revert ? false, postFetch ? "", nativeBuildInputs ? [ ], ...}@args:let args' = if relative != null then { stripLen = 1 + lib.length (lib.splitString "/" relative) + stripLen; extraPrefix = lib.optionalString (extraPrefix != null) extraPrefix; } else { inherit stripLen extraPrefix; };inlet inherit (args') stripLen extraPrefix;inlib.throwIfNot (excludes == [ ] || includes == [ ]) "fetchpatch: cannot use excludes and includes simultaneously" fetchurl ( { nativeBuildInputs = [ patchutils ] ++ nativeBuildInputs; postFetch = '' tmpfile="$TMPDIR/patch"
if [ ! -s "$out" ]; then echo "error: Fetched patch file '$out' is empty!" 1>&2 exit 1 fi
set +e ${decode} < "$out" > "$tmpfile" if [ $? -ne 0 ] || [ ! -s "$tmpfile" ]; then echo 'Failed to decode patch with command "'${lib.escapeShellArg decode}'"' >&2 echo 'Fetched file was (limited to 128 bytes):' >&2 od -A x -t x1z -v -N 128 "$out" >&2 exit 1 fi set -e mv "$tmpfile" "$out"
lsdiff \ ${lib.optionalString (relative != null) "-p1 -i ${lib.escapeShellArg relative}/'*'"} \ "$out" \ | sort -u | sed -e 's/[*?]/\\&/g' \ | xargs -I{} --delimiter='\n' \ filterdiff \ --include={} \ --strip=${toString stripLen} \ ${ lib.optionalString (extraPrefix != null) '' --addoldprefix=a/${lib.escapeShellArg extraPrefix} \ --addnewprefix=b/${lib.escapeShellArg extraPrefix} \ '' } \ --clean "$out" > "$tmpfile"
if [ ! -s "$tmpfile" ]; then echo "error: Normalized patch '$tmpfile' is empty (while the fetched file was not)!" 1>&2 echo "Did you maybe fetch a HTML representation of a patch instead of a raw patch?" 1>&2 echo "Fetched file was:" 1>&2 cat "$out" 1>&2 exit 1 fi
filterdiff \ -p1 \ ${toString (map (x: "-x ${lib.escapeShellArg x}") excludes)} \ ${toString (map (x: "-i ${lib.escapeShellArg x}") includes)} \ ${ lib.optionalString (hunks != [ ]) "-# ${lib.escapeShellArg (lib.concatMapStringsSep "," toString hunks)}" } \ "$tmpfile" > "$out"
if [ ! -s "$out" ]; then echo "error: Filtered patch '$out' is empty (while the original patch file was not)!" 1>&2 echo "Check your includes and excludes." 1>&2 echo "Normalized patch file was:" 1>&2 cat "$tmpfile" 1>&2 exit 1 fi '' + lib.optionalString revert '' interdiff "$out" /dev/null > "$tmpfile" mv "$tmpfile" "$out" '' + postFetch; } // removeAttrs args [ "relative" "stripLen" "decode" "extraPrefix" "excludes" "includes" "hunks" "revert" "postFetch" "nativeBuildInputs" ] )