I want to work with Git repositories or sub-repositories like in Mercurial Share extension.
So, here's what I have:
mkdir orig
cd orig
echo "osthuaosteh" > abc
git init --shared
git add abc
git commit -m 'init'
cd ..
mkdir another
How can I initialize a repo in another so that it shares the repository with orig?
I need this for a big library that I want to include as a sub-repository. The repo weighs hundreds of megs, so I want to reuse some of the folders.
Update: I want to be able to have different revisions in different working folders.
What I would ask you is: do you really need to share the repository?
Like Mercurial, git creates hard-links between repositories when you make a local clone, resulting in only little extra disk space consumption. E.g.:
git clone http://example.org/repo repo
git clone repo repo-copy1
git clone repo repo-copy2
Most files in the repo-copy1 and repo-copy2 repositories will hard-link to repo, and will not consume extra disk space. Only the files in the working copy are actual copies.
You can confirm this behaviour like this:
$ df -l
Filesystem 512-blocks Used Available Capacity Mounted on
/dev/disk0s2 976101344 217966872 757622472 23% /
$ git clone --no-checkout repo repo-copy
Cloning into repo-copy...
done.
$ du -cs repo-copy/.git
63528 .
63528 total
$ df -l
Filesystem 512-blocks Used Available Capacity Mounted on
/dev/disk0s2 976101344 217967536 757621808 23% /
As you can see, after cloning a 65880-block repository (of 512 bytes each), the block count on the file system went down by only 664 blocks.
If you clone a (sub)repository from a remote server you may have to manually create the hard links to other local clones; for Mercurial you would use the relink extension for that; the git equivalent also seems to be called that.