GIT: extracting a folder as new repo

GitExtractSubRepo.txt

# 1. cleanup working dir
git status
git reset --hard HEAD
git clean -nd
git clean -fd
# 2. remove origin refs
git remote rm origin
# 3. remove unnecessary tags and branches
## remove all tags and branches apart for your future master via GUI
## this will speed up the filtering and they need to be removed anyway
# 4. do the filtering
git filter-branch --subdirectory-filter <folder> -- --all
# 5. check if everything is ok
ls
git status
git log
# 6. remove lefovers if any
git clean -nf
git clean -df
# 7. remove backup refs
git for-each-ref --format="%(refname)" refs/original/ | xargs -n 1 git update-ref -d
# 8. run gc
git reflog expire --expire=now --all
git gc --prune=now
# 9. Remove entries for nonexistent branches
git config --local -e