Git Split Repository With Commit History

Andrew Bolster

Researcher at the University of Liverpool, Founder/Director at Farset Labs

Thesis submitted, Viva cleared (with minor corrections) but this post isn’t about all that…

Simple one; how do you go from one monolithic project repository to multiple respositories without losing all that tasty tasty commit history?

#! /bin/zsh
#
# git_split.sh Current_Repo username new_repo {list of files/folders you want to keep}
# Copyright (C) 2016 bolster <[email protected]>
#
# Distributed under terms of the MIT license.
#



BASEDIR=$1
INITDIR=`pwd`
NEWREPO="[email protected]:$2/$3.git"
shift 3
FILTER_ARGS=[email protected]
TMPDIR=`mktemp -d -t ${BASEDIR}_XXXXXXXXX`
echo $BASEDIR $TMPDIR $FILTER_ARGS

cp -ra $BASEDIR/. $TMPDIR
cd $TMPDIR
git filter-branch --index-filter "git rm --cached -qr --ignore-unmatch -- . && git reset -q \$GIT_COMMIT -- $FILTER_ARGS" --prune-empty -- --all && git repack -a -d -f --depth=250 --window=250 && git remote set-url origin $NEWREPO && git gc && git push -u origin master
ls -latrh
cd $INITDIR
rm -rf $TMPDIR

YMMV, IANAGG, No refunds, Safety not guaranteed

(And I’d still like a better way of cleaning up the object history of the new repos… leave a comment if you’ve got a better idea!)

Published: October 17 2016

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