detach subdir from one repo to another

detach.txt

## vim:tw=72:ai:formatoptions=tcqln:nocindent

##  This is taken from stack overflow. article titled "detach subdir" 
#    http://stackoverflow.com/questions/359424/detach-subdirectory-into-separate-git-repository

# However, it was all scattered, and no clue where to run what command.

# change REPO for each subdir. Do not run this as a script, preferably cut 
# paste each line and run it.

exoprt REPO=core

# come out of rbcurse to higher dir
# cd .. 

# rbcurse is the existing repo
# rbcurse-core is the new repo i wish to create which contains only
# lib/rbcurse/core from the old rbcurse

git clone --no-hardlinks rbcurse rbcurse-$REPO
cd rbcurse-$REPO
git remote rm origin

# this removed everything other than lib/rbcurse/core
git filter-branch --subdirectory-filter lib/rbcurse/$REPO HEAD -- --all

# everything was placed in the root folder, so i have to
# move it back into the appropriate folder

mkdir -p lib/rbcurse/$REPO
git mv include lib/rbcurse/$REPO
git mv widgets lib/rbcurse/$REPO
git mv util lib/rbcurse/$REPO
git mv system lib/rbcurse/$REPO
git commit -m "moved files to new subdirectory"
git reset --hard
/bin/rm -rf .git/refs/original/
git reflog expire --expire=now --all
git gc --aggressive --prune=now

# create a new repo for this, click this link on browser
# http://help.github.com/create-a-repo/ 
git remote add origin git@github.com:rkumar/rbcurse-$REPO.git

#git push -u origin master
# in my case 
# git commit -m "moved files to new subdirectory"
git push -u origin 1.5.0

# until now we have created a new repo, but stuff still exists in the
# old rbcurse repo for $REPO

# go back into the old repo
cd ../rbcurse
# takes a few minutes
git filter-branch -f --index-filter "git rm -q -r -f --cached --ignore-unmatch lib/rbcurse/$REPO" --prune-empty HEAD

# no need to commit. nothing to commit
# won't push, gives an error of fast_forward

#### Had to do a git push -f origin 1.5.0

# finally to update master with 1.5.0 since merge was not allowing me

# go to github admin and rename default to some other branch

git branch -m master master-old  # rename master on local
git push -f origin :master          # delete master on remote
git push origin master-old       # create master-old on remote
git checkout -b master 1.5.0 # create a new local master on top of 1.5
git push origin master           # create master on remote

# go back to admin and rename default to master

The last part about master and 1.5.0 was only because i had done all this from a branch. If you've done all this from master tiself, then skip the part about updating master with 1.5 and beyond. Just do a "git push -f" and get on with other directories you may wish to detach.