Aid to reproducing libgit2 issue

gunk-up-test-repo

#! /bin/sh

set -e

usage() {
    echo "usage: $0 (--one-level | --two-level | with-ref) <git-dir> <count>"
}

make_one_level() {
    base="$1"
    mkdir -p "$base"
}

make_two_level() {
    base="$1"
    mkdir -p "$base/d"
}

make_with_ref() {
    base="$1"
    mkdir -p "$base"
    echo $sha1 >"$base/r"
}

count() {
    type="$1"
    find "$gunk_dir" -type $type -print | wc -l
}

if test $# != 3
then
    usage
    exit 1
fi

case "$1" in
--one-level)
    func=make_one_level
    ;;
--two-level)
    func=make_two_level
    ;;
--with-ref)
    func=make_with_ref
    ;;
*)
    usage
    exit 1
    ;;
esac

git_dir="$2"
count="$3"

gunk_dir="$git_dir/refs/gunk"

sha1=$(GIT_DIR="$git_dir" git rev-parse HEAD)

test -d "$gunk_dir" && rm -r "$gunk_dir"

echo "Creating approximately $count repetitions"

seq 0 $((count-1)) |
    xargs printf "%08d\n" |
    sed -Ee "s#(..)#/\1#g" |
    sed -Ee "s#(.*)#$gunk_dir\1#" |
    while read base
    do
	$func $base
    done

echo "Created $(count d) directories and $(count f) files"