Split a git repo in multiple repositories, one per top-level directory.

git-split.sh

#!/bin/sh

# Split a git repo in multiple repositories, one per top-level directory.
#
# assume there are no spaces in dir names etc.
# assume the git repo is in the working directory

# Manuel Pégourié-Gonnard, 2009, WTFPLv2.
# This is gist #137698 <http://gist.github.com/137698>

REPO=$1

DOT=`pwd`
DIRS=`cd $REPO && echo *`

for DIR in $DIRS; do
    if [ -d $REPO/$DIR ]; then
        git clone file://$DOT/$REPO /tmp/$DIR;
        (cd /tmp/$DIR 
        && git filter-branch --prune-empty --subdirectory-filter $DIR)
        git clone file:///tmp/$DIR $DIR;
        rm -rf /tmp/$DIR
        (cd $DIR && git remote rm origin)
    fi
done