git-compact

#!/bin/sh
# Lower size of GIT_DIR with no regard to future performance
# klg, Feb 2019
set -e

GIT_DIR=$(git rev-parse --git-dir)

# objects: prune and repack
git prune
case "$1" in
  (-[0-9])
    git -c "pack.compression=${1#-}" repack -nadF \
      --window 9000 --depth 250 --threads 1
    ;;
  (*)
    git repack -qndl --window 9000 --depth 250
    ;;
esac

# refs: pack
git pack-refs --all

# hooks: remove default samples
find "$GIT_DIR" -type f -path '*/hooks/*.sample' -exec rm '{}' +

# info: remove unused
for f in info/exclude info/attributes
do if [ -f "$GIT_DIR/$f" ]
then
  grep -qv '^#' "$GIT_DIR/$f" || rm -f "$GIT_DIR/$f"
fi done
rm -f "$GIT_DIR/info/refs" # generated by git update-server-info

# other fluff
rm -rf "$GIT_DIR/logs/"
rm -f "$GIT_DIR/gitk.cache"
rm -f "$GIT_DIR/COMMIT_EDITMSG"
if [ -f "$GIT_DIR/description" ]
then
  grep -qxF "Unnamed repository; edit this file 'description' to name the repository." "$GIT_DIR/description" &&
    rm -f "$GIT_DIR/description"
fi

# remove empty directories
find "$GIT_DIR" -depth -type d -exec rmdir '{}' + 2>/dev/null || :
mkdir -p "$GIT_DIR/refs" # this needs to exist even if everything is packed

# modules: recurse
if [ -d "$GIT_DIR/modules" ]
then for module in "$GIT_DIR/modules"/*
do
  ( cd "$module" && GIT_DIR=. "$0" "$@" )
done fi