move subdirectory of repo to a new repo

gistfile1.sh

#!/bin/bash

# abort on any errors
set -e

# be verbose
set -x

# Move a subdir to a new repo
# http://stackoverflow.com/questions/359424/detach-subdirectory-into-separate-git-repository
oldgiturl="git@git.assembla.com:krux_interchange.3.git"
sourcerepo="krux_interchange.3"
sourcesubdir=webapp/krux
newgiturl="git@github.com:krux/dataconsole.git"
destrepo=`basename $newgiturl | sed 's/\.git//'`

if [ -d "$sourcerepo" ] ; then
    echo "$sourcerepo exists"
    exit
fi

if [ -d "$destrepo" ] ; then
    echo "$destrepo exists"
    exit
fi

git clone $oldgiturl

# Copy the directory.
# Don't use 'git clone' because we don't know what the upstream branches are
# Don't use 'cp -ra' because it doesn't get symlinks
rsync -a $sourcerepo/ $destrepo


# Pull over the existing branches
cd $destrepo
for branch in `git branch -a | grep remotes | grep -v " -> " | grep -v master | sed 's/remotes\/origin\///'`; do
    git branch -t $branch origin/$branch
done

# Commit the added branches
git commit || true

# Filter what we don't want
git filter-branch --tag-name-filter cat --prune-empty --subdirectory-filter $sourcesubdir -- --all

# Pull over the old .gitignore
cp ../$sourcerepo/.gitignore ./
git add .gitignore
git commit -m "Pull over .gitignore"

# Clean up
git gc

# Set the remote
git remote set-url origin $newgiturl

# Push to master
git push -u origin master

# Push the other branches
for branch in `git branch | grep -v master`; do
    git push origin $branch
done