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#!/bin/sh
# Set the checked-out files' mtimes according to their last Git revision.
# Written by Thomas Schwinge <tschwinge@gnu.org>
trap '
if [ x"$tmp_dir" = x ]; then :; else
rm -rf -- "$tmp_dir"
fi
' EXIT &&
# TODO: handle arguments meaning to only process a subset (directories / files)
# of the repository.
if [ x"$#" = x0 ]; then :; else
echo >&2 No command line arguments expected.
exit 1
fi &&
tmp_dir=$(mktemp -d) &&
tmp_ignore=$tmp_dir/ignore &&
# TODO: have to add more flags?
git ls-files \
> "$tmp_ignore" \
-d -m &&
while read file; do
echo >&2 "*** WARNING: file <$file> locally changed or deleted, not touching"
done < "$tmp_ignore" &&
tmp_known=$tmp_dir/known &&
git ls-files \
> "$tmp_known" \
-c &&
tmp_consider=$tmp_dir/consider &&
grep \
< "$tmp_known" \
> "$tmp_consider" \
-f "$tmp_ignore" -x -v &&
while read file; do
# TODO: use %ci? TODO: can we optimize this to not have to invoke git log
# individually for every single file?
date_git=$(git log -1 --pretty=format:%ai -- "$file") &&
date_git=$(date --rfc-3339=ns -d "$date_git") &&
date_file=$(date --rfc-3339=ns -r "$file") &&
if [ x"$date_git" = x"$date_file" ]; then :; else
echo >&2 "*** INFO: file $file: mtime <$date_file> -> <$date_git>"
touch -m -d "$date_git" "$file"
fi \
|| {
echo >&2 "*** ERROR: file <$file>, date_git <$date_git>, date_file <$date_file>"
exit 1
}
done < "$tmp_consider"
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