Re: [PATCH] submodules: don't stumble over symbolic links when cloning recursively

Am 11.07.2012 21:10, schrieb Johannes Sixt:

Am 11.07.2012 20:11, schrieb Jens Lehmann:

quoted

Since 69c305178 (submodules: refactor computation of relative gitdir path)
cloning a submodule recursively fails for recursive submodules when a
symbolic link is part of the path to the work tree of the superproject.

This happens when module_clone() tries to find the relative paths between
work tree and git dir. When a symbolic link in current $PWD points to a
directory in a different level determining the number of "../" needed to
traverse to the superprojects work tree leads to a wrong result.

As there is no portable way to say "pwd -P" use cd_to_toplevel to remove
the link from the pwd, which fixes this problem.

...

quoted

-	a=$(cd "$gitdir" && pwd)/
-	b=$(cd "$sm_path" && pwd)/
+	a=$(cd_to_toplevel && cd "$gitdir" && pwd)/
+	b=$(cd_to_toplevel && cd "$sm_path" && pwd)/

But if you cd out, how can it be correct not to cd in again if $gitdir
and/or $sm_path are relative?

I'm not sure what you mean by "cd out", but the two "cd_to_toplevel"
make sure that when $gitdir or $sm_path are relative the symbolic link
gets removed from the output of pwd. So it's rather "cd into the path
where the symlink is resolved".

And if $gitdir and/or $sm_path are absolute, how can the earlier
cd_to_toplevel make a difference?

Then it doesn't, but $sm_path is always relative while $gitdir is
sometimes (in the superproject it returns ".git"). Just drop either
of the "cd_to_toplevel" and run the test ;-)

But it looks like the commit message could use some tuning ...

quoted

+test_expect_success 'submodule update can handle symbolic links in pwd' '

Please add a SYMLINKS prerequisite.

Oops. Thanks, will add that.

Will wait some time for other comments before preparing v2.