diff options
Diffstat (limited to 'pkgs/build-support/setup-hooks/set-source-date-epoch-to-latest.sh')
-rw-r--r-- | pkgs/build-support/setup-hooks/set-source-date-epoch-to-latest.sh | 31 |
1 files changed, 31 insertions, 0 deletions
diff --git a/pkgs/build-support/setup-hooks/set-source-date-epoch-to-latest.sh b/pkgs/build-support/setup-hooks/set-source-date-epoch-to-latest.sh new file mode 100644 index 00000000000..9e325106f82 --- /dev/null +++ b/pkgs/build-support/setup-hooks/set-source-date-epoch-to-latest.sh @@ -0,0 +1,31 @@ +updateSourceDateEpoch() { + local path="$1" + + # Get the last modification time of all regular files, sort them, + # and get the most recent. Maybe we should use + # https://github.com/0-wiz-0/findnewest here. + local -a res=($(find "$path" -type f -print0 | xargs -0 -r stat -c '%Y %n' | sort -n | tail -n1)) + local time="${res[0]}" + local newestFile="${res[1]}" + + # Update $SOURCE_DATE_EPOCH if the most recent file we found is newer. + if [ "$time" -gt "$SOURCE_DATE_EPOCH" ]; then + echo "setting SOURCE_DATE_EPOCH to timestamp $time of file $newestFile" + export SOURCE_DATE_EPOCH="$time" + + # Warn if the new timestamp is too close to the present. This + # may indicate that we were being applied to a file generated + # during the build, or that an unpacker didn't restore + # timestamps properly. + local now="$(date +%s)" + if [ "$time" -gt $((now - 60)) ]; then + echo "warning: file $newestFile may be generated; SOURCE_DATE_EPOCH may be non-deterministic" + fi + fi +} + +postUnpackHooks+=(_updateSourceDateEpochFromSourceRoot) + +_updateSourceDateEpochFromSourceRoot() { + updateSourceDateEpoch "$sourceRoot" +} |