A bash script to separate directories from within a large git repository into their own repository, maintaining relevant history

export-directory-repos.sh

#!/bin/bash

# Enter the paths in the main repo to the subdirectories you want to extract
# Separate paths with spaces or newlines
repos=(
artwork
checklists
code/comingsoon
code/utility
)


echo "Total repos to export : ${#repos[*]}"

# Put the directory of the main repo here. 
master=monolith-repo-master


for repo in "${repos[@]}"
do
  
  
  subdir=$(basename $repo)

  echo "${repo} => ${subdir}"


  cp -R $master $subdir
  cd $subdir
  git filter-branch --prune-empty --subdirectory-filter $repo master
  git for-each-ref --format='delete %(refname)' refs/original | git update-ref --stdin
  git reflog expire --expire=now --all
  git gc --prune=now

  cd ../

done