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feat: Speed up utimes #1108

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Nov 11, 2023
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148 changes: 108 additions & 40 deletions bin/git-utimes
Original file line number Diff line number Diff line change
@@ -1,46 +1,114 @@
#!/usr/bin/env bash
# shellcheck disable=SC2312,SC2248,SC2250,SC2064,SC2086
#
# Change files modification time to their last commit date
#
if [ "$1" = "--touch" ]; then
# Internal use option only just to parallelize things.
newer_flag=""
[ "$2" = "--newer" ] && newer_flag="true"
shift 2
bsd=$(date -j > /dev/null 2>&1 && echo 'true')
if [ -n "$bsd" ]; then
stat_flags="-f %m"
date_flags="-r"
else
stat_flags="-c %Y"
date_flags="-d@"
fi
for f; do
git_s=$(git --no-pager log --no-renames --pretty=format:%ct -1 @ -- "$f" 2>/dev/null)
# shellcheck disable=SC2086
mod_s=$(stat $stat_flags "$f" 2>/dev/null)
if [ -n "$git_s" ] && [ -n "$mod_s" ] && [ "$mod_s" -ne "$git_s" ]; then
if [ "$mod_s" -gt "$git_s" ] || [ -z "$newer_flag" ]; then
# shellcheck disable=SC2086
t=$(date $date_flags$git_s '+%Y%m%d%H%M.%S')
echo "+ touch -h -t $t $f" >&2
touch -h -t "$t" "$f"
fi
fi
done

if [[ "${1:-}" == "--newer" ]]; then
op=le
shift
else
opt_r=$(xargs -r false < /dev/null > /dev/null 2>&1 && echo '-r')

# `-n` should be limited or parallelization will not give effect,
# because all args will go into single worker.
NPROC=$(nproc 2>/dev/null || sysctl -n hw.ncpu 2>/dev/null || getconf _NPROCESSORS_ONLN 2>/dev/null)
# don't touch files that have been modified in the worktree or index
# bsd doesn't have `-z` option for `comm` and `cut`, so use `tr` as work around
prefix="$(git rev-parse --show-prefix) "
# shellcheck disable=SC2086
comm -23 <(git ls-tree -z -r --name-only --full-name @ | tr '\0' '\n' | sort) \
<(git status -z --porcelain | tr '\0' '\n' | cut -c 4- | sort) \
| cut -c ${#prefix}- \
| tr '\n' '\0' \
| xargs -0 -P"${NPROC:-1}" -n 24 $opt_r git utimes --touch "$1"
op=eq
fi

# BSD systems
if date -j &>/dev/null; then
stat_flags="-f %m"
date_flags="-r"
else
# Non-BSD systems
stat_flags="-c %Y"
date_flags="-d@"
fi

# sanity check, not required:
awk_flags=
if awk --help 2>&1 | grep -q -- '--posix'; then
awk_flags='--posix'
fi

bash_opts=
if bash --help 2>&1 | grep -q -- '--noprofile'; then
bash_opts='--noprofile'
fi
if bash --help 2>&1 | grep -q -- '--norc'; then
bash_opts="${bash_opts} --norc"
fi
# sanity check, not required:
if bash --help 2>&1 | grep -q -- '--posix'; then
bash_opts="${bash_opts} --posix"
fi

prefix="$(git rev-parse --show-prefix) "
strip="${#prefix}"

status_opts=
whatchanged_opts=
if git status --help 2>&1 | grep -q -- "--no-renames"; then
status_opts="--no-renames"
whatchanged_opts="--no-renames"
fi
if git status --help 2>&1 | grep -q -- "--untracked-files"; then
status_opts="${status_opts} --untracked-files=no"
fi
if git status --help 2>&1 | grep -q -- "--ignored"; then
status_opts="${status_opts} --ignored=no"
fi

tmpfile=$(mktemp)
trap "rm -f '${tmpfile}'" 0

# prefix is stripped:
git --no-pager status --porcelain --short ${status_opts} . |
cut -c 4- >"${tmpfile}"

# prefix is not stripped:
git --no-pager whatchanged ${whatchanged_opts} --format='%ct' . |
awk $awk_flags \
-F'\t' \
-v date_flags="${date_flags}" \
-v op="${op}" \
-v stat_flags="${stat_flags}" \
-v strip="${strip}" \
-v tmpfile="${tmpfile}" \
'BEGIN {
seen[""]=1
print "t() {"
print " test -e \"$2\" || return 0"
printf(" test \"$(stat %s \"$2\" 2>/dev/null)\" -%s \"$1\" && return 0\n", stat_flags, op)
if (date_flags == "-d@") {
print " echo \"+ touch -h -d@$1 $2\""
print " touch -h -d@$1 \"$2\""
} else {
printf(" t=$(date %s$1 \"+%Y%m%d%H%M.%S\")\n", date_flags)
print " echo \"+ touch -h -t $t $2\""
print " touch -h -t $t \"$2\""
}
print "}"
}
FILENAME==tmpfile {
skip[$1]=1
next
}
!/^$/ {
# skip deletes
if (substr($1, length($1), 1) ~ /D/) {
next
}
if (NF == 1) {
ct=$1
next
}
$2 = substr($2, strip, length($2)- strip + 1)
if ($2 in seen) {
next
}
if ($2 in skip) {
next
}
seen[$2]=1
# escape quotes:
gsub(/"/, "\\\"", $2)
printf("t %s \"%s\"\n", ct, $2)
}
' "${tmpfile}" - | BASH_ENV='' bash ${bash_opts} /dev/stdin