Git repository and branches ?

Git repository and branches ?

[Xavier Maillard]

Hi,

How can I get a specific branch of the current CVS using the git
repository ? Cloning the git repository has only fetched the
master branch.

Regards,

	Xavier
-- 
http://www.gnu.org
http://www.april.org
http://www.lolica.org

Re: Git repository and branches ?

[Miles Bader]

Xavier Maillard <xma@gnu.org> writes:
> How can I get a specific branch of the current CVS using the git
> repository ? Cloning the git repository has only fetched the
> master branch.

Cloning with git fetches _all_ branches that exist in the cloned git
repo.  They are under the "origin/" namespace.

You can see them with:

   git branch -a

To switch your working directory to one of those branches, you can use
the git-checkout command.  It's possibly to simply checkout one of the
origin branches (e.g., "git checkout origin/lexbind"), but generally you
don't want to do unless you're not going to do any modifications (the
reason is that "origin/" branches are supposed to represent the pristine
contents of the repo you cloned from, to make future interaction
easier).  So the more usual method is to create a local branch which
tracks the given origin branch, e.g.:

   git checkout -b lexbind origin/lexbind

[After that, you can switch to your local lexbind branch by just
using "git checkout lexbind"; to switch back to the trunk, use
"git checkout master".]

-Miles

-- 
Quack, n. A murderer without a license.

Re: Git repository and branches ?

[Michael Olson]

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Miles Bader <miles@gnu.org> writes:

> To switch your working directory to one of those branches, you can use
> the git-checkout command.  It's possibly to simply checkout one of the
> origin branches (e.g., "git checkout origin/lexbind"), but generally
> you don't want to do unless you're not going to do any modifications
> (the reason is that "origin/" branches are supposed to represent the
> pristine contents of the repo you cloned from, to make future
> interaction easier).  So the more usual method is to create a local
> branch which tracks the given origin branch, e.g.:
>
>    git checkout -b lexbind origin/lexbind

If you want to track changes made to that branch in the remote repo, you
can alternatively do:

git branch --track lexbind origin/lexbind

-- 
|       Michael Olson  |  FSF Associate Member #652     |
| http://mwolson.org/  |  Hobbies: Lisp, HCoop          |
| Projects: Emacs, Muse, ERC, EMMS, ErBot, DVC, Planner |
`-------------------------------------------------------'

[-- Attachment #2: Type: application/pgp-signature, Size: 188 bytes --]

Re: Git repository and branches ?

[Miles Bader]

Michael Olson <mwolson@gnu.org> writes:
>>    git checkout -b lexbind origin/lexbind
>
> If you want to track changes made to that branch in the remote repo, you
> can alternatively do:
>
> git branch --track lexbind origin/lexbind

Hmm, tracking is the default with my settings; not sure what the default
settings are these days (I have a vague memory that tracking may be the
default too).

-Miles

-- 
"Most attacks seem to take place at night, during a rainstorm, uphill,
 where four map sheets join."   -- Anon. British Officer in WW I

Re: Git repository and branches ?

[Xavier Maillard]

   Xavier Maillard <xma@gnu.org> writes:
   > How can I get a specific branch of the current CVS using the git
   > repository ? Cloning the git repository has only fetched the
   > master branch.

   Cloning with git fetches _all_ branches that exist in the cloned git
   repo.  They are under the "origin/" namespace.

Right.

      git checkout -b lexbind origin/lexbind

   [After that, you can switch to your local lexbind branch by just
   using "git checkout lexbind"; to switch back to the trunk, use
   "git checkout master".]

Will my local git repository be able to "track" the activity of
the branch I am working. In short, will git-pull also fetch
branches ? If not, how can I tell it to automatically track and
fetch any change made on a given remote branch ?

Regards,

	Xavier
-- 
http://www.gnu.org
http://www.april.org
http://www.lolica.org

Re: Git repository and branches ?

[Miles Bader]

Xavier Maillard <xma@gnu.org> writes:
>       git checkout -b lexbind origin/lexbind
>
>    [After that, you can switch to your local lexbind branch by just
>    using "git checkout lexbind"; to switch back to the trunk, use
>    "git checkout master".]
>
> Will my local git repository be able to "track" the activity of
> the branch I am working. In short, will git-pull also fetch
> branches?

That command should set up a "tracking branch" by default (I just
checked, and indeed --track is now the default; it didn't use to be,
though, so be aware if you have an old version of git), which means
that "git pull" will fetch and merge the current branch.

[I'm a bit fuzzy on what exactly gets _fetched_ by default -- whether
all branches from the origin remote, or only the origin branch
corresponding to the current branch -- but I know only the current
branch will be _merged_ when you do "git pull" or "git merge".  So
after using "git checkout BRANCH" to switch to a new branch, it's a
good idea to use "git pull" again to make sure it's up to date.]

-Miles

-- 
Marriage, n. The state or condition of a community consisting of a master, a
mistress and two slaves, making in all, two.

Re: Git repository and branches ?

[Andreas Schwab]

Miles Bader <miles.bader@necel.com> writes:

> [I'm a bit fuzzy on what exactly gets _fetched_ by default -- whether
> all branches from the origin remote, or only the origin branch
> corresponding to the current branch

It's the former: git clone sets up the default refspec to fetch all
branches from the origin remote
(remote.origin.fetch=+refs/heads/*:refs/remotes/origin/*).

Andreas.

-- 
Andreas Schwab, SuSE Labs, schwab@suse.de
SuSE Linux Products GmbH, Maxfeldstraße 5, 90409 Nürnberg, Germany
PGP key fingerprint = 58CA 54C7 6D53 942B 1756  01D3 44D5 214B 8276 4ED5
"And now for something completely different."

Re: Git repository and branches ?

[Xavier Maillard]

   Miles Bader <miles.bader@necel.com> writes:

   > [I'm a bit fuzzy on what exactly gets _fetched_ by default -- whether
   > all branches from the origin remote, or only the origin branch
   > corresponding to the current branch

   It's the former: git clone sets up the default refspec to fetch all
   branches from the origin remote
   (remote.origin.fetch=+refs/heads/*:refs/remotes/origin/*).

Where did you see this information exactly ?

	Xavier
-- 
http://www.gnu.org
http://www.april.org
http://www.lolica.org

Re: Git repository and branches ?

[Andreas Schwab]

Xavier Maillard <xma@gnu.org> writes:

>    Miles Bader <miles.bader@necel.com> writes:
>
>    > [I'm a bit fuzzy on what exactly gets _fetched_ by default -- whether
>    > all branches from the origin remote, or only the origin branch
>    > corresponding to the current branch
>
>    It's the former: git clone sets up the default refspec to fetch all
>    branches from the origin remote
>    (remote.origin.fetch=+refs/heads/*:refs/remotes/origin/*).
>
> Where did you see this information exactly ?

$ git config -l

Andreas.

-- 
Andreas Schwab, SuSE Labs, schwab@suse.de
SuSE Linux Products GmbH, Maxfeldstraße 5, 90409 Nürnberg, Germany
PGP key fingerprint = 58CA 54C7 6D53 942B 1756  01D3 44D5 214B 8276 4ED5
"And now for something completely different."

Re: Git repository and branches ?

[Xavier Maillard]

   >    (remote.origin.fetch=+refs/heads/*:refs/remotes/origin/*).
   >
   > Where did you see this information exactly ?

   $ git config -l

So simple...

Thank you

	Xavier
-- 
http://www.gnu.org
http://www.april.org
http://www.lolica.org

Re: Git repository and branches ?

[Xavier Maillard]

   Xavier Maillard <xma@gnu.org> writes:
   >       git checkout -b lexbind origin/lexbind
   >
   >    [After that, you can switch to your local lexbind branch by just
   >    using "git checkout lexbind"; to switch back to the trunk, use
   >    "git checkout master".]
   >
   > Will my local git repository be able to "track" the activity of
   > the branch I am working. In short, will git-pull also fetch
   > branches?

   That command should set up a "tracking branch" by default (I just
   checked, and indeed --track is now the default; it didn't use to be,
   though, so be aware if you have an old version of git), which means
   that "git pull" will fetch and merge the current branch.

   [I'm a bit fuzzy on what exactly gets _fetched_ by default -- whether
   all branches from the origin remote, or only the origin branch
   corresponding to the current branch -- but I know only the current
   branch will be _merged_ when you do "git pull" or "git merge".  So
   after using "git checkout BRANCH" to switch to a new branch, it's a
   good idea to use "git pull" again to make sure it's up to date.]

Once again, thank you very much for your help. I tested it here
and it worked like a charm. The only drawback is that switching
from a branch to master and vice versa takes very long...

I can live with that though.

	Xavier
-- 
http://www.gnu.org
http://www.april.org
http://www.lolica.org

Re: Git repository and branches ?

[Miles Bader]

Xavier Maillard <xma@gnu.org> writes:
> I tested it here and it worked like a charm. The only drawback is that
> switching from a branch to master and vice versa takes very long...

Really?  That's very surprising.  For me it's about 5 seconds to switch
between some emacs branches, with a cold FS cache (once stuff is in the
filesystem cache, switching is essentially instanteous).

Are you per-chance using windows?

-miles

-- 
=====
(^o^;
(()))
*This is the cute octopus virus, please copy it into your sig so it can spread.

Re: Git repository and branches ?

[Xavier Maillard]

   Xavier Maillard <xma@gnu.org> writes:
   > I tested it here and it worked like a charm. The only drawback is that
   > switching from a branch to master and vice versa takes very long...

   Really?  That's very surprising.  For me it's about 5 seconds to switch
   between some emacs branches, with a cold FS cache (once stuff is in the
   filesystem cache, switching is essentially instanteous).

Maybe is has to do with the hardware then; my /home is mounted
onto a SDHC card as my current laptop does not have a valid
internal HDD.

   Are you per-chance using windows?

Are you joking ? :) I am using a real GNU/linux system, more
precisely, it is a Slackware 12.0 GNU/linux system.

	Xavier
-- 
http://www.gnu.org
http://www.april.org
http://www.lolica.org

Re: Git repository and branches ?

[Xavier Maillard]

   Xavier Maillard <xma@gnu.org> writes:
   > I tested it here and it worked like a charm. The only drawback is that
   > switching from a branch to master and vice versa takes very long...

   Really?  That's very surprising.  For me it's about 5 seconds to switch
   between some emacs branches, with a cold FS cache (once stuff is in the
   filesystem cache, switching is essentially instanteous).

Maybe is has to do with the hardware then; my /home is mounted
onto a SDHC card as my current laptop does not have a valid
internal HDD.

Here are the results of consecutive git branch/git checkout:

xma@localhost> git branch                                                                                     ~/usr/src/GITed/emacs
* master
  rmail-mbox
xma@localhost> time git checkout rmail-mbox                                                                   ~/usr/src/GITed/emacs
Switched to branch "rmail-mbox"
git checkout rmail-mbox  5.97s user 1.04s system 6% cpu 1:41.16 total
xma@localhost> git branch                                                                                     ~/usr/src/GITed/emacs
  master
* rmail-mbox
xma@localhost> time git checkout master                                                                       ~/usr/src/GITed/emacs
Switched to branch "master"
git checkout master  5.16s user 0.88s system 8% cpu 1:07.25 total

As you can see, the results are really bad but I do not
switch between branch so often.
   
   Are you per-chance using windows?

Are you joking ? :) I am using a real GNU/linux system, more
precisely, it is a Slackware 12.0 GNU/linux system.

	Xavier
-- 
http://www.gnu.org
http://www.april.org
http://www.lolica.org