Re: Newbie question about setting up git repository from svn (git svn)

[Neal Kreitzinger <nkreitzinger@gmail.com>]

On 3/4/2011 9:57 AM, Hillel (Sabba) Markowitz wrote:
> Please respond directly to sabbahillel@gmail.com as I do not have time
> to follow this mailing list.
>
It is standard practice on this newsgroup to reply to the sender and cc 
the original cclist along with the newgroup.  Following this newsgroup 
can be challenging when your schedule is busy, but you can learn alot of 
really cool stuff by perusing it regularly.  I try to keep up daily but 
alas I am a few days behind.

> I am attempting to set up a git repository based on an svn repository.
> The idea would be that the members of the project would be able to use
> git exclusively with the central git repository acting as the
> coordinator. This git server would be the only one capable of issuing
> the git svn dcommit and git svn rebase and the members of the project
> would not have to worry about it. Eventually, the subversion
> repository would be transferred to git.
>
I have no experience with git-svn (the svn part, that is), but your plan 
sounds good to me.  Read on to see my comments on the parts I do have 
experience with...

> I created a separate Ubuntu VM in order to set up the git repository.
> I used "git svn clone -s" to set up MyProject.git on "gitserver"
>
> The command "git branch -a" shows
> * master
>    remotes/branch1
>    remotes/branch2
>    remotes/trunk
>
>
> I then went to my main VM and used ssh to clone the repository
>
> git clone gitserver:/opt/git/MyProject
> cd MyProject
> git branch -a
> * master
>    remotes/origin/HEAD ->  origin/master
>    remotes/origin/master
>
> How do I check out the trunk or appropriate branches from the remote?
> I am probably misreading the documentation. Would it be
>
> git checkout -b branch1
>
"git checkout -b branch1" will create a new branch called branch1 based 
on whatever your current HEAD is.  HEAD is the commit that you are 
currently pointing to, ie. the tip of the branch currently checkout out. 
  (see git checkout manpage.)  By "trunk" i take it you mean the 
"master" branch, e.g. "git checkout master".  The asterisk indicates 
above that you are currently on master which is the "trunk" (assuming we 
have the same definition of "trunk").  Therefore, "git checkout -b 
branch1" will create a new branch called "branch1" that has the same 
history as master.  It sounds like you want to checkout "branch1", 
"branch2", and "trunk".  Read on...

> does the master on the remote (and here) actually point to the trunk by default?
> should I checkout the branches on "gitserver"?
>
not being familiar with git-svn, but familiar with "git", I would advise 
you to do the following:
(1) on "gitserver" perform:
(a) git branch branch1 remotes/branch1 (this will create a branch called 
branch1 that tracks remotes/branch1)
(b) git branch branch2 remotes/branch2
(c) git branch trunk remotes/trunk
Now you have the branches master, branch1, branch2, and trunk on 
"gitserver".
(2) I don't know how to push from a git repo to an svn repo so I can't 
tell you if gitserver master points to svn trunk or not.  However, read 
on for what I do know...

> I also do not see how I can get the list of branches from the remote
> location.without having to do an ssh into the gitserver, cd to the
> repository directory, and use a 'branch -a' there. Is there a way to
> ask for this information? I have not yet been successful in setting up
> gitosis yet because this is on an internal company intranet and I do
> not have a valid machine name for my accounts as everything is being
> done on VMs. Thus, my public key ends with
> "sabbahillel@desktop-ubuntu" rather than an actual machine name or
> address.
>
The way you get the list is by doing a git-fetch on MyProject (AFTER you 
create the branches on gitserver).  This will create remote tracking 
branches for all the branches on gitserver.  Notice I said "branches on 
gitserver" and not "remote tracking branches on gitserver".  You can't 
track the remote tracking branches of your remote (at least not sanely). 
  Thats why you had to create tracking branches on gitserver that track 
the remote tracking branches that track the svn repo.  Now that you have 
branches "branch1", "branch2", and "trunk" on gitserver you can track 
them in MyProject.  git-fetch will create remotes/origin/branch1, 
remotes/origin/branch2, remotes/origin/trunk in MyProject.  Now you can 
do "git branch branch1 remotes/origin/branch1" to create the branch1 
branch in MyProject.  "git checkout branch1" in MyRepo will check it 
out.  Repeat for branch2 and trunk.  (I'm not familiar with ssh details, 
but I assume your last ssh comment is made into a non-issue by what I 
just stated above.)

> Would you have a pointer to a HOW-TO that discusses this.
>
I assume these links:

http://git-scm.com/course/svn.html

https://git.wiki.kernel.org/index.php/GitSvnCrashCourse

https://git.wiki.kernel.org/index.php/GitSvnSwitch

https://git.wiki.kernel.org/index.php/SvnMigration

http://utsl.gen.nz/talks/git-svn/intro.html

http://www.tfnico.com/presentations/git-and-subversion

or the git-svn manpage:

http://www.kernel.org/pub/software/scm/git/docs/v1.7.1.4/git-svn.html

will help you. (you need to use the git version of the manual that 
corresponds to your installation.  1.7.1.4 is relevant to me, but 
perhaps not to you.)

> Thanks for any help that you can give me.
>
> --
>         Sabba     -          סבא הלל        -     Hillel
> Hillel (Sabba) Markowitz | Said the fox to the fish, "Join me ashore"
>   SabbaHillel@gmail.com | The fish are the Jews, Torah is our water
> http://sabbahillel.blogspot.com

Despite my ignorance regarding svn and git-svn, I hope my comments will 
be of some help to you or point you in the right direction.

v/r,
Neal