git-svn commit count vs- revision count

git-svn commit count vs- revision count

[Tobi]

Hi!

I've `git-svn clone`ed a pretty large repository, which took about 3 days
even with with local access to the SVN repository. To check that
everything went ok, I listed the root commits with `git fsck --root
--full` and verfied, that these are indeed root commits with no branch point.

So far so good... what's puzzling me is, that `git rev-list --all | wc -l`
says I have 40731 commits, but the SVN repository only has 21875 revisons.

Shouldn't these numbers be the same? The only explanation I have, is, that
git-svn imported one or more branches or tags, where it failed to find the
correct branch point in the history. Is there a way to figure out, if
there went something wrong and possibly fix it?

Thx,

Tobias

Re: git-svn commit count vs- revision count

[Michael J Gruber]

Tobi venit, vidit, dixit 27.07.2009 10:45:
> Hi!
> 
> I've `git-svn clone`ed a pretty large repository, which took about 3 days
> even with with local access to the SVN repository. To check that
> everything went ok, I listed the root commits with `git fsck --root
> --full` and verfied, that these are indeed root commits with no branch point.
> 
> So far so good... what's puzzling me is, that `git rev-list --all | wc -l`
> says I have 40731 commits, but the SVN repository only has 21875 revisons.
> 
> Shouldn't these numbers be the same? The only explanation I have, is, that
> git-svn imported one or more branches or tags, where it failed to find the
> correct branch point in the history. Is there a way to figure out, if
> there went something wrong and possibly fix it?

With svn, it is possible to commit to (or create) several branches or
tags in one go (i.e. revision), whereas with git those would be
individual commits. For example, some people always create a commit and
a tag "pointing" to it in one go in svn (commit to trunk and tags/foo).
(The same is true for "svn style subprojects", i.e. subdirs used as
subprojects.)

If that has been used to a large extent then it may explain the
difference, although it is very large. Have you checked whether git-svn
produced the (number of) branches and tags that you expect?

Michael

Re: git-svn commit count vs- revision count

[Tobi]

> With svn, it is possible to commit to (or create) several branches or
> tags in one go (i.e. revision), whereas with git those would be
> individual commits.

I don't think this explains a difference of about 20000 commits.

> difference, although it is very large. Have you checked whether git-svn
> produced the (number of) branches and tags that you expect?

I can't exactly tell, if all the branches are correct, because a lot of
the branches already have been merged and deleted in the SVN repository.

I checked the "git log --all" output with a small script to see, where
multiple commits belong to the same SVN revision (according to the
git-svn-id. Some SVN revions have up to 4 commits.

If I check some of these commits with `git branch --contains` then it
seems only one of the commits belongs to branch.

Is it possible, that a commit doesn't belong to any branch?

Tobias

Re: git-svn commit count vs- revision count

[Tobi]

> Is it possible, that a commit doesn't belong to any branch?

PS: gitk shows something like "Branches: many (43)" for such commits -
whatever this means...

Re: git-svn commit count vs- revision count

[Tobi]

Tobi wrote:

> PS: gitk shows something like "Branches: many (43)" for such commits -
> whatever this means...

PPS: Ok - 1 second of thinking - of course it means, that this commit
belongs to 43 branches and I forgot the "-r" in "git branch --contains".
So all commits belong to branch.

But there are still SVN-Revions with up to 4 commits.

I checked the SVN logs of such revisons and it indeed seems to be the
case, that these revisions update multiple branches. The number of touched
branches per SVN commit still doesn't match the number of git-commits for
this SVN revision, but it at least partially explains the high number of
git commits compared to the svn revision count.

Tobias