shrink size of git repository

README

Source: http://stevelorek.com/how-to-shrink-a-git-repository.html

I adopted Steve's script so that you can now do:

# list top 10 
./gitsize.sh

# delete for sure
./gitsize.sh --delete file ...

# reclaim space
./gitsize.sh --reclaim

The script will prompt you before doing anything dangerous.

gitsize.sh

#!/bin/bash
#set -x 

# Shows you the largest objects in your repo's pack file.
# Written for osx.
#
# @see http://stubbisms.wordpress.com/2009/07/10/git-script-to-show-largest-pack-objects-and-trim-your-waist-line/
# @author Antony Stubbs

# set the internal field spereator to line break, so that we can iterate easily over the verify-pack output
IFS=$'\n';

list() 
{
  # list all objects including their size, sort by size, take top 10
  objects=`git verify-pack -v .git/objects/pack/pack-*.idx | grep -v chain | sort -k3nr | head`

  echo "All sizes are in kB's. The pack column is the size of the object, compressed, inside the pack file."

  output="size,pack,SHA,location"
  for y in $objects
  do
	# extract the size in bytes
	size=$((`echo $y | cut -f 5 -d ' '`/1024))
	# extract the compressed size in bytes
	compressedSize=$((`echo $y | cut -f 6 -d ' '`/1024))
	# extract the SHA
	sha=`echo $y | cut -f 1 -d ' '`
	# find the objects location in the repository tree
	other=`git rev-list --all --objects | grep $sha`
	#lineBreak=`echo -e "\n"`
	output="${output}\n${size},${compressedSize},${other}"
  done

  echo -e $output | column -t -s ', '
}

if [ "$1" == "" ]; then
  list
fi

if [ "$1" == "--delete" ]; then
  shift 1
  echo "*** ATTENTION: YOU ARE ABOUT TO DELETE $*"
  read -p "Are you sure? (yes/NO)" yn
  if [ "$yn" == "YES" ]; then
    RMCMD="'git rm -r --cached --ignore-unmatch "$*"'"
    echo $RMCMD
    CMD="git filter-branch --tag-name-filter cat --index-filter $RMCMD --prune-empty -f -- --all"
    echo Executing: $CMD
    eval $CMD
  else
    echo "Aborting, not sure what you want. You have to reply YES if you want to delete!"
    exit -1
  fi
fi

if [ "$1" == "--reclaim" ]; then
  echo "Reclaiming space"
  read -p "Are you sure? (yes/NO)" yn
  if [ "$yn" == "YES" ]; then
    rm -rf .git/refs/original/
    git reflog expire --expire=now --all
    git gc --prune=now
    git gc --aggressive --prune=now
  else
   echo "Aborting, not sure what you want. You have to reply YES if you want to reclaim space!"
   exit -1 
  fi
fi