trac: revision log doesn't always see commits

[davidsarah]

I committed a patch to docs/write_coordination.rst​, with description "docs/write_coordination.rst: fix formatting and add more specific warning about access via sshfs." The revision immediately before this commit was r5236. The trac source browser shows the effect of the patch on the file, but it does not show the commit, either in the revision log (global or per-file) or in the annotated rendering of the file.

I suspect that the trac notification posthook sometimes fails, although there is no indication that it did in the darcs push output:

[...]
Thu Sep  1 00:21:48 BST 2011  david-sarah@jacaranda.org
  * docs/write_coordination.rst: fix formatting and add more specific warning about access via sshfs.
Shall I push this patch? (10/10)  [ynWsfvplxdaqjk], or ? for help: y
Enter passphrase for key '/home/davidsarah/.ssh/id_rsa': 
Note: if you want to change the default remote repository to
source@tahoe-lafs.org:darcs/tahoe-lafs/trunk,
quit now and issue the same command with the --set-default flag.
now in tahoe-lafs.orgs generic-posthook.sh
about to sh notify-trac.sh
Finished applying...
Posthook ran successfully.
Finished applying...
Posthook ran successfully.
sending 1 change to buildmaster:
 20110831232148-93fa1-7405c0ec191575e135f61093ee2fe45dc45b4ce5.gz
change sent successfully
Push successful.