#!/bin/bash
 
 if [[ $# != 2 ]]; then
   echo "${0} <repo> <tag>"
   exit 1
 fi
 
 set -x
 set -e
 
 REPO="$1"
 TAG="$2"
 DIR="$(basename "$REPO")"
 DIR="${DIR%.*}"
 TMP="$(mktemp -d "/tmp/git-repo-XXXX")"
 trap "{ rm -rf "$TMP"; }" EXIT 
 
 mkdir -p "$TMP/$DIR"
 pushd "$TMP"
 #phase 1: clone the repo
 git clone "$REPO" "${DIR}-orig"
 #phase 2: clone again with the tag/commit only
 cd "$DIR"
 git init --template=/dev/null
 git remote add origin "../${DIR}-orig"
 git fetch origin "$TAG" --depth=1
 git checkout FETCH_HEAD
 git gc --aggressive --prune=now
 COMMIT="$(git rev-parse --short HEAD)"
 cd ..
 du -xhd1
 popd
 
 tar -czf "$DIR-$COMMIT.tar.gz" -C "$TMP" "$DIR"