Sebastian Leske venit, vidit, dixit 18.11.2012 18:08:
> git svn will sometimes create branches with an at-sign in the name
> (branchname@revision). These branches confuse many users and it is a FAQ
> why they are created. Document when git svn will create them.
>
> Signed-off-by: Sebastian Leske
> ---
>
> I found various important features of git-svn that are not documented.
> Thus I created a series of patches to add and update documentation for
> git-svn. I am sending this as four patches (of which this mail is the
> first). I have tried my best to make the patches ready for inclusion
> into git, but if there's any feedback, I'll gladly incorporate it.
>
>
> Documentation/git-svn.txt | 26 ++
> 1 file changed, 26 insertions(+)
>
> diff --git a/Documentation/git-svn.txt b/Documentation/git-svn.txt
> index 8b0d3ad..482d60d 100644
> --- a/Documentation/git-svn.txt
> +++ b/Documentation/git-svn.txt
> @@ -881,6 +881,32 @@ different name spaces. For example:
> branches = stable/*:refs/remotes/svn/stable/*
> branches = debug/*:refs/remotes/svn/debug/*
>
> +If 'git svn' is configured to fetch branches (and --follow-branches
> +is in effect), it will sometimes create multiple branches for one SVN
> +branch, where the addtional branches have names of the form
> +'branchname@nnn' (with nnn an SVN revision number). These additional
> +branches are created if 'git svn' cannot find a parent commit for the
> +first commit in the branch, to connect the branch to the history of the
> +other branches. Normally, 'git svn' will find the git commit that
> +corresponds to the SVN revision a branch was created (copied) from and
> +use that as the parent. However, it is possible that there is no
> +suitable git commit to serve as parent. This will happen, among other
> +reasons, if the SVN branch is a copy of a revision that was not fetched
> +by 'git svn' (e.g. because it is an old revision that was skipped with
> +'--revision'), or if in SVN a directory was copied that is not tracked
> +by 'git svn' (a branch that is not tracked at all, or a subdirectory of
> +a tracked branch). In these cases, 'git svn' will still create a git
> +branch, but the branch will not be connected to the history of the other
> +branches. 'git svn' will also create a commit from the SVN revision the
> +branch was copied from, and use that as the parent commit of the branch
> +(this is indicated by the message "Initializing parent: ").
> +Additionally, it will create a special branch named
> +'@', where is the SVN revision
> +number the branch was copied from. This branch will point to the
> +specially created parent commit.
> +If in SVN the branch was deleted and later recreated from a different
> +version, there will be multiple such branches with an '@'.
> +
> BUGS
>
>
>
In fact, the most typical reason for at-branches is a botched branching
or tagging operation on the svn side: since they are simply "copy"
operations it's too easy to copy a tree into the wrong directory.
Michael
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