Infrastructure/VersionControl/dist-git

From FedoraProject

Jump to: navigation, search

Some notes regarding using git as a replacement for CVS

Contents

Conversion

Tools Used

To convert dist-cvs to git repositories, I make use of:

Layout

The current layout I'm using is rougly the same as dist-cvs: <packagename>/<release-dirs>. I've omitted the rpms/ dir for now, as it may become an alias to getting all rpms. With CVS, the package dir was basically the module, and each release directory was just a directory, even though we call it a 'branch'. For git, I've made it so that each release directory is it's own local clone of the package repo. This allows for "branch" confined logging and history, as well as making it easier to setup ACLs. Since git doesn't let you keep a repo of local repos very easily, each package 'module' is a repo itself just containing a file named 'branches' that is a list of all the release branches that exist for that package.

How to Convert

I had /cvs/extras restored from backup to the xen host under /cvs/extras.

The conversion tools need both the CVSROOT __and__ a checkout of the content to do proper conversion. I setup a directory structure as such: 

/cvs/extras/
dist-git/extras/

Basic workflow: 

cd dist-git/extras/
mkdir <packagename>
git cvsimport -v -d /cvs/extras/ -C <packagename>/<releasedir> <packagename>/<releasedir>
cd <packagename>/<releasedir>
git repack -a -d

One would loop through each releasedir of each package (or at least devel/ FC-6/ FC-5/ FC-4/ FC-3/), git init-db the <packagedir> and git add/commit the branches file. It will also repack/prune the git metadata as the import doesn't seem to do this. This saves a LOT of space. I've converted all of extras package CVS as well as the common module. The quick bash string I used was: 

for rpm in <code>ls /cvs/extras/rpms/</code>;
do mkdir ${rpm};
for branch in /cvs/extras/rpms/${rpm}/{FC-[3456] ,devel};
do git cvsimport -d /cvs/extras/ -C ${rpm}/<code>basename ${branch}</code> ${rpm}/<code>basename ${branch}</code>;
done;
pushd ${rpm};
for dir in *;
do echo ${dir} >> branches;
pushd ${dir};
git repack -a -d;
popd
done;
git init-db;
git add branches;
git commit -m 'add branches';
rm branches;
popd;
done

Time to convert all of extras was: 

real    556m51.452s
user    32m36.370s
sys     68m29.753s

Size after converstion:

3.9G /srv/git/extras

Server Setup

File system and Permissions

git can be accessed via http, ssh or the git protocol. In my test server, I created /srv/git to serve up the repositories. I created a group 'fedora' and set group sticky and write bits on /srv/git.


Work Needed

These are some of the high level items that need to be investigated or implimented. If you wish to help, please contact JesseKeating.

Done!

Currently done for cvs with /cvs/extras/CVSROOT/tag-check for CVS.

Gotchas

Retrieved from "https://fedoraproject.org/wiki/Infrastructure/VersionControl/dist-git"