I have been trouble getting BackupPC to do a proper tar incremental backup. The
problem seems to be with tar and the $incrDate format. my setup is all on
localhost, with no SSH, or other remote access.
Here is some sample log output:
----- SNIPPET OF LOG -----
Contents of file /var/lib/backuppc/pc/localhost/XferLOG.93.z, modified
2005-08-08\ 12:31:15
Running: /usr/bin/sudo /usr/local/bin/backuppc-tar -v -f - -C /bin --totals
--newer='2005-08-02 19:00:00' .
Xfer PIDs are now 11565,11564
/bin/tar: Substituting 1901-12-13 15:45:52 for unknown date format
`\'2005-08-02'
/bin/tar: 19\:00\:00': Cannot stat: No such file or directory
Total bytes written: 3164160 (3.1MiB, 2.1MiB/s)
/bin/tar: Error exit delayed from previous errors
Tar exited with error 512 () status
create 755 0/0 0 .
pool 755 0/0 625228 bash
pool 755 0/0 4 rbash
pool 755 0/0 4 sh
pool 755 0/0 13848 readlink
pool 755 0/0 11036 run-parts
pool 755 0/0 5620 tempfile
pool 755 0/0 5576 mktemp
pool 755 0/0 31404 chgrp
----- END SNIPPET OF LOG -----
As you can see, the tar command is confused by the date format. Here I've
modified the $Conf{TarIncrArgs} to put the date in single quotes. The specific
modification I made was to make the define look like this:
$Conf{TarIncrArgs} = '--newer=\'$incrDate\' $fileList';
This was because when I just used:
$Conf{TarIncrArgs} = '--newer=$incrDate $fileList';
The error log looked like something along these lines:
/bin/tar: Treating date `2005-08-02' as 2005-08-02 00:00:00 + 0 nanoseconds
/bin/tar: 19\:00\:00: Cannot stat: No such file or directory
Which led me to believe that the tar command was treating the hour portion of
the date as a file argument.
Unhappy that my incremental backups are broken, I started digging around in
Tar.pm and found the source of $incrDate. I am presently testing a modification
to timeStamp subroutine in the Lib.pm file. There, I changed the file as follows:
FROM: return sprintf("%04d-%02d-%02d %02d:%02d:%02d",
TO: return sprintf("%04d-%02d-%02d\\ %02d:%02d:%02d",
This way, my date string is not fully escaped, but the space that seemed to be
causing problems *is* escaped. This seems like a hack that shouldn't have been
necessary, but I can't figure out why my incremental backups are otherwise failing.
Can anyone provide some help?
Thanks.
Chris Horn.
PS - my localhost.pl conf file (line breaks malformatted due to email wrap):
# We're using tar to backup our files
$Conf{XferMethod} = 'tar';
# Which mount points/directories to backup
$Conf{TarShareName} =
['/bin','/boot','/etc','/home','/lib','/lost+found','/root','/sbin','/storage','/usr','/var','/work'];
# This specifies the specific tar command to use
#
# Defaults:
# $Conf{TarClientCmd} = '/usr/bin/env LC_ALL=C $tarPath -c -v -f - -C
$shareName' . ' --totals';
#
# $Conf{TarClientRestoreCmd} = '$sshPath -q -x -l root $host'
# . ' /usr/bin/env LC_ALL=C $tarPath -x -p --numeric-owner --same-owner'
# . ' -v -f - -C $shareName+';
#
$Conf{TarClientCmd} = '/usr/bin/sudo /usr/local/bin/backuppc-tar -v -f - -C
$shareName --totals';
$Conf{TarClientRestoreCmd} = '/usr/bin/sudo $tarPath -x -p --numeric-owner
--same-owner -v -f - -C $shareName';
# This is the non-shell escaped versions of the parameters
$Conf{TarIncrArgs} = '--newer=$incrDate $fileList';
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