[rdiff-backup-users] checking backups in progress

[David Kempe]

Hi,
how hard would it be for rdiff-backup to write the pid of the 
rdiff-backup --server process to a file (or the current_mirror_marker) 
on startup?
I have found the section of the source where rdiff-backup writes the 
current_mirror marker, but don't know enough python on how to write a 
patch to inject the pid into the file.
There is a getpid() function in the posix python module. not sure if 
thats a good idea.

dave