Bug in svn merge url1 url2 wc

Hi,

For some time now, we got repeated reports about merges failing with
TSVN. Those could usually get resolved by deactivating virus scanners or
closing other apps. Bad thing was, we never really found out *why* the
merge was failing with the error
svn: can't open 'tmp': Access is denied.

But yesterday, someone (Andrej Ota) found out that this happens because
Subversion tries to create the 'tmp' folder where the user doesn't have
write access to.

Further investigation showed that Subversion uses the cwd instead of the
temp directory to create its temporary folders and files. This might not
be a big problem for the CL client, but it is for TSVN. You see, TSVN is
started from the explorer, and the explorer doesn't really have a cwd
because any program can change it - especially the windows media player
changes it to C:\WINDOWS\MEDIA (where a non-Admin user doesn't have
write access). So when the explorer starts TSVN, TSVN then automatically
gets the same cwd as the explorer.

Just so you see that's not a TSVN bug I created a script with the CL
client to show you the bug:

- create a directory 'D:\testreadonly', then remove write access for the
currently logged in user, only leave read access

# cd D:\testreadonly
# mkdir D:\test
# svn co
https://svn.collab.net/repos/tortoisesvn/tags/version_1.0/doc/sources/en
d:\test\en
# svn merge
https://svn.collab.net/repos/tortoisesvn/tags/version_1.0/doc/sources/en
https://svn.collab.net/repos/tortoisesvn/trunk/doc/sources/en d:\test\en

svn: can't open 'tmp': Access is denied.

I've now implemented a workaround in TSVN so the cwd always points to a
folder where the current user has write access, but Subversion really
should use the temp directory for merges too.
(FYI: both the TMP and the TEMP env variable are set on my system to a
folder in my user dir where I have full write access).

All this with svn 1.2.0.

Stefan

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