[Rdiff-backup-bugs] [bug #16534] Exception if you request a deleted increment

[Whitney]

Follow-up Comment #3, bug #16534 (project rdiff-backup):

I have seen this behavior as well.  It seems that rdiff-backup dies with an
exception when you call --remove-older-than with a number of sessions that is
(actual number + 1).  For instance, the system directory has 13 increments,
one increment per session:

<code># rdiff-backup -l system
Found 13 increments:
    increments.2007-03-28T04:02:13-05:00.dir   Wed Mar 28 04:02:13 2007
    increments.2007-03-29T04:04:02-05:00.dir   Thu Mar 29 04:04:02 2007
    increments.2007-03-30T04:01:33-05:00.dir   Fri Mar 30 04:01:33 2007
    increments.2007-03-31T04:01:39-05:00.dir   Sat Mar 31 04:01:39 2007
    increments.2007-04-01T04:05:27-05:00.dir   Sun Apr  1 04:05:27 2007
    increments.2007-04-02T04:01:29-05:00.dir   Mon Apr  2 04:01:29 2007
    increments.2007-04-03T04:01:32-05:00.dir   Tue Apr  3 04:01:32 2007
    increments.2007-04-04T04:12:17-05:00.dir   Wed Apr  4 04:12:17 2007
    increments.2007-04-05T04:01:08-05:00.dir   Thu Apr  5 04:01:08 2007
    increments.2007-04-06T04:23:33-05:00.dir   Fri Apr  6 04:23:33 2007
    increments.2007-04-07T04:01:18-05:00.dir   Sat Apr  7 04:01:18 2007
    increments.2007-04-08T04:01:19-05:00.dir   Sun Apr  8 04:01:19 2007
    increments.2007-04-09T04:05:28-05:00.dir   Mon Apr  9 04:05:28 2007
Current mirror: Tue Apr 10 04:01:28 2007
</code>

Here are the results of running --remove-older-than with session numbers from
13-20:

<code># rdiff-backup --remove-older-than 13B system
No increments older than Wed Mar 28 04:02:13 2007 found, exiting.

# rdiff-backup --remove-older-than 14B system
Traceback (most recent call last):
  File "/usr/bin/rdiff-backup", line 23, in ?
    rdiff_backup.Main.Main(sys.argv[1:])
  File "/usr/lib/python2.4/site-packages/rdiff_backup/Main.py", line 285, in
Main
    take_action(rps)
  File "/usr/lib/python2.4/site-packages/rdiff_backup/Main.py", line 263, in
take_action
    elif action == "remove-older-than": RemoveOlderThan(rps[0])
  File "/usr/lib/python2.4/site-packages/rdiff_backup/Main.py", line 764, in
RemoveOlderThan
    time = rot_check_time(remove_older_than_string)
  File "/usr/lib/python2.4/site-packages/rdiff_backup/Main.py", line 771, in
rot_check_time
    try: time = Time.genstrtotime(time_string)
  File "/usr/lib/python2.4/site-packages/rdiff_backup/Time.py", line 223, in
genstrtotime
    return time_from_session(int(timestr[:-1]), rp)
  File "/usr/lib/python2.4/site-packages/rdiff_backup/Time.py", line 192, in
time_from_session
    return session_times[-session_num-1]
IndexError: list index out of range

# rdiff-backup --remove-older-than 15B system
No increments older than Wed Mar 28 04:02:13 2007 found, exiting.

# rdiff-backup --remove-older-than 16B system
No increments older than Wed Mar 28 04:02:13 2007 found, exiting.

# rdiff-backup --remove-older-than 17B system
No increments older than Wed Mar 28 04:02:13 2007 found, exiting.

# rdiff-backup --remove-older-than 18B system
No increments older than Wed Mar 28 04:02:13 2007 found, exiting.

# rdiff-backup --remove-older-than 19B system
No increments older than Wed Mar 28 04:02:13 2007 found, exiting.

# rdiff-backup --remove-older-than 20B system
No increments older than Wed Mar 28 04:02:13 2007 found, exiting.
</code>

This may be fixed in later versions.  I'm running:

<code># python -V
Python 2.4.3
# rdiff-backup --version
rdiff-backup 1.0.4
</code>

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