I'm working with two repositories on the same machine:
/code
drwxr-xr-x   18 root      admin   612 27 Jan 15:39 ./
drwxr-xr-x   16 root      admin   544  5 Jan 00:33 ../
drwxr-xr-x    7 hspencer  staff   238 27 Jan 15:38 _darcs/
drwxr-xr-x    7 hspencer  staff   238 27 Jan 15:45 working_proj/

/Darcs
drwxr-xr-x   5 hspencer  staff   170 27 Jan 15:39 ./
drwxrwxr-t  40 root      admin  1360 27 Jan 15:20 ../
drwxr-xr-x   7 hspencer  staff   238 27 Jan 15:39 _darcs/


Running "darcs push /Darcs" from the /code directory gives the following message:
darcs: Failed to create temporary file darcs: permission denied (Permission denied)

darcs 1.0.8, Revision 1
on OSX 10.3.9

This error is a bit different than that mentioned in the diagnostic messages
section of the documentation.  I have permission to write to my local
repository, and the remote repository, but am missing permission to write to the
root directory of my local repository.  I have permission to write to selected
subfolders of the root directory.  So I'm not clear why I need access to the
root of the local repository in order to push to another repository.

Sounds like a duplicate of issue76.  Moving you there.  Thanks.