mirrors/ladybird
0
0
Fork 0
mirror of https://github.com/LadybirdBrowser/ladybird.git synced 2025-08-10 01:59:31 +00:00
Code Issues Projects Releases Packages Wiki Activity Actions 9

Meta: Provide a way to only update a file if the output changes

Browse source 
This is only useful for build commands that update their destination in all cases
and thus sometimes confuse cmake into rebuilding everything needlessly.
This commit is contained in:
Ben Wiederhake 2020-08-02 22:05:45 +02:00 • committed by Andreas Kling
commit aaa13e5739
Notes: sideshowbarker 2024-07-19 04:20:12 +09:00
1 changed files with 28 additions and 0 deletions
Download patch file Download diff file Expand all files Collapse all files

28
Meta/write-only-on-difference.sh Executable file
View file

@ -0,0 +1,28 @@
#!/bin/sh
set -e
if [ "$#" -lt "2" ]; then
echo "USAGE: $0 <file> <cmd...>"
exit 1
fi
DST_FILE="$1"
shift
# Just in case:
mkdir -p -- "$(dirname -- "${DST_FILE}")"
cleanup()
{
rm -f -- "${DST_FILE}.tmp"
}
trap cleanup 0 1 2 3 6
"$@" > "${DST_FILE}.tmp"
# If we get here, the command was successful, and we can overwrite the destination.
if ! cmp --quiet -- "${DST_FILE}.tmp" "${DST_FILE}"; then
# File changed, need to overwrite:
mv -f -- "${DST_FILE}.tmp" "${DST_FILE}"
fi