121 lines
3.5 KiB
Nix
121 lines
3.5 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"
|
|
]
|
|
)
|