git-rev-parse --show-cdup returns a relative path instead of absolute (problem with git pull --rebase not finding the git dir)

Hi,

Im reporting this based on a conversation I had in the #git channel on freenode.

I have a setup where various subdirectories of a number of git repos are symlinked into a common directory tree. Something like what the following would create but with more repositories involved:

cd ~; mkdir foo; chdir foo; git init; mkdir bar; git add bar ; git commit -m'add bar' ; cd ~; ln -s foo/bar bar ; cd bar;

[try various git commands, not all will work]

Most git command seem perfectly happy to work on the correct repos from this symlinked tree. However at least one doesnt, git pull --rebase, in particular.

Doing a 

	git-rev-parse --git-dir 

seems to behave correctly (always finding the correct location) and 

	git-rev-parse --is-inside-work-dir

reports true. However git-pull --rebase responds with lots of "fatal: Not a git repository" messages. Example is below.

During discussion about this on #git it was suggested this was because 

	git-rev-parse --show-cdup 

returns a relative path. (../).

Im not on list so id appreciate it if anyone replying to this could cc me on the mail.

Oh, i am aware of submodules but i have to work with what i have now. 

Cheers, yves

Example of git pull --rebase failing yet git commit working:

[dmq@somewhere apps]$ echo test > test.txt
[dmq@somewhere apps]$ git add test.txt
[dmq@somewhere apps]$ git commit -m'add a test file -- will remove next
commit'
Created commit 45ab725: add a test file -- will remove next commit
 1 files changed, 1 insertions(+), 0 deletions(-)
 create mode 100644 apps/test.txt
[dmq@somewhere apps]$ git rm test.txt
rm 'apps/test.txt'
[dmq@somewhere apps]$ git commit -m'removed test file'
Created commit 2768e6d: removed test file
 1 files changed, 0 insertions(+), 1 deletions(-)
 delete mode 100644 apps/test.txt
[dmq@somewhere apps]$ git pull --rebase
fatal: Not a git repository
fatal: Not a git repository
fatal: Not a git repository
fatal: Not a git repository