mirror of
https://github.com/NixOS/nixpkgs.git
synced 2024-11-15 14:26:33 +01:00
95 lines
3 KiB
Nix
95 lines
3 KiB
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 }:
|
|
|
|
{ relative ? null
|
|
, stripLen ? 0
|
|
, decode ? "cat" # custom command to decode patch e.g. base64 -d
|
|
, extraPrefix ? null
|
|
, excludes ? []
|
|
, includes ? []
|
|
, 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;
|
|
};
|
|
in let
|
|
inherit (args') stripLen extraPrefix;
|
|
in
|
|
lib.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{} \
|
|
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 \
|
|
${builtins.toString (builtins.map (x: "-x ${lib.escapeShellArg x}") excludes)} \
|
|
${builtins.toString (builtins.map (x: "-i ${lib.escapeShellArg x}") includes)} \
|
|
"$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;
|
|
} // builtins.removeAttrs args [
|
|
"relative" "stripLen" "decode" "extraPrefix" "excludes" "includes" "revert"
|
|
"postFetch" "nativeBuildInputs"
|
|
])
|