I have a backup script setup to copy various files from one machine to another over ssh. Both ends are using Ext4, though the receiving end is using it on a USB mass storage device (if that makes a difference). I have the problem that some, seemingly random, files are listed as being recopied every time I run the script even though they haven't been modified. I can look on the destination and the timestamp has been updated to whatever "now" was during the copy, though the file has not changed.
I found this post regarding a similar problem with rsyncing to/from NTFS, but the timestamp issue there shouldn't apply to Ext4. Just in case, I've tried both --modify-window (which didn't work) and -u which mysteriously did work.
The permissions shouldn't be a problem since my user on the sending end is the same as my user on the receiving end and I'm not specifying any sort of preservation. Here's my command line:
rsync -rvz --no-g --links --safe-links --delete-after --delete-excluded [source] [destination]
I've verified that the delete and compress options aren't messing with it by removing them temporarily; I still get the same random files that get recopied.
Here's an example listing of files that get recopied:
source (only pertinent files listed)
/home/lytithwyn/Documents/: -rw-rw-r-- 1 lytithwyn lytithwyn 11754 2012-08-04 13:44 family birthdays.ods -rw-rw-r-- 1 lytithwyn lytithwyn 12897 2012-08-17 09:23 youth_fund.ods
building file list ... done Documents/family birthdays.ods Documents/youth_fund.ods
destination after copy (only pertinent files listed)
/mattbackup/lithboxhome/Documents/: -rw-rw-r-- 1 lytithwyn lytithwyn 11754 Aug 17 09:49 family birthdays.ods -rwxr-xr-x 1 lytithwyn lytithwyn 12897 Aug 17 09:49 youth_fund.ods
Like in the other post, -u fixes it but that feels like a kludge. Anyone know whats really going on? Now that I look at it, I'm not sure what's up with the random execute permissions on the destination either.