Reduce Git Repo Size -- destructive

reduceRepo.sh

#!/bin/bash

BFG_URL=http://repo1.maven.org/maven2/com/madgag/bfg/1.12.16/bfg-1.12.16.jar
DIR=$(mktemp -d)
echo $DIR
cd $DIR
curl $BFG_URL -o bfg.jar

git clone --mirror git@github.com:istio/istio.git 

# All istioctl-* binaries are bigger than this.
java -jar bfg.jar --strip-blobs-bigger-than 2M istio.git

cd istio.git
# show current size
echo "Size before cleanup"
git count-objects -v

# cleanup space
git reflog expire --expire=now --all
git gc --prune=now --aggressive

echo "Size after cleanup"
git count-objects -v
echo "cd $DIR/istio.git"
echo "Run git push if cleaned up files look ok"