Save file modification times on git repository.

git-mtime

#!/bin/bash

set -e

# check if is valid repo
git rev-parse HEAD >/dev/null

# cd to top level
cd -- "$(git rev-parse --show-toplevel)"

list_all_files() {
    # wierd way to get all files (that are not ignored by .mtimeignore)
    D=
    {
        git ls-files --exclude-per-directory .mtimeignore -x .mtimeignore -x .gitignore -zci
        git ls-files --exclude-standard -zci
    } | sort -z | comm -z23 <(git ls-files -zc | sort -z) - | while IFS= read -rd $'\0' F; do
        # add directories
        DIR=$(dirname -- "$F")
        if [ "$DIR" != "$D" ]; then
            echo -n "$DIR"
            echo -ne "\x00"
            D=$DIR
        fi
        echo -n "$F"
        echo -ne "\x00"
    done | sort -z | uniq -z
}

cmd_save() {
    {
        echo "# git-mtime v1.0"
        echo "# by goncalomb"
        echo "# https://github.com/goncalomb/dotfiles"
        list_all_files | while IFS= read -rd $'\0' F; do
            echo "touch -cmd @$(stat -c %.Y "$F") $(printf "%q" "$F")"
        done
    } >.mtimes
}

cmd_touch() {
    [ ! -f .mtimes ] && echo "'.mtimes' file not found" && exit 1
    [ "$(head -n 1 .mtimes)" != "# git-mtime v1.0" ] && echo "'.mtimes' file is invalid" && exit 1
    bash .mtimes
}

case "$1" in
    save) cmd_save ;;
    touch) cmd_touch ;;
    *)
        echo "usage: ${0##*/} save"
        echo "       ${0##*/} touch"
        ;;
esac