There are several issues that reference this task, so I'm creating a new ticket
for it.  This is the plan Petr developed over the second darcs hacking sprint,
so I'm assuming he's still on it :-)

* Issues
    * Zooko stale remote - issue1153
    * Meaningless local paths - issue1159
    * Meaningless local paths that are accidentally meaningful (NFS automounter)
- issue1240 

* Plan
 * check for availability of repo root (that we're fetching from), and if not
available
 * remote: ignore the entry for this darcs (we want to keep the entry in case
it's just transient error)

    * "WARNING: can't use <foo> please remove it from _darcs/prefs/sources"

 * local: remove the entry
 * fix unionCaches - optional, but could be nice (issue1159)
 * long term? on timeout: disable all sources from a given host for this darcs
(URL, Ssh [transient])

Note that the reference to issue1240 here was actually meant to be to issue1210

I'm stepping in here, as he is already drowning in darcs work.

I think this goes with GSoC, sorta-kinda. One way or the other.

I suggest we bump this so we have time to give it proper testing

This was resolved by:

Sat Aug  7 01:33:39 BST 2010  builes.adolfo@googlemail.com
  * Resolve issue 1599: automatically expire unused caches

But I think the autoresolver never picked it up because of the space
between issue and the number.  Sorry, I did notice it on review, but bit
my tongue because I was expecting the script to be more flexible.

Re-opening this one after noticing that the test actually fails. Note:
you need to have lighttpd installed to reproduce, otherwise the test is
skipped.

The failing test was caused by a broken test script which is fixed 
now, see patch2245