Force new permissions on files after rsync from seedbox

Question

I have a seedbox-account which I use for torrenting. I have set up a cron job that uses rsync to download all files from the seedbox to my 14.04.1 ubuntu server. The download folder is a samba share, as I have previously used windows to organize the content into folders before moving it to a more permanent place on my server. Before upgrading to 14.04, I used 12.04 and everything worked OK.

The problem is that the files I get from the seedbox is owned by a user called "544" (this is the username generated by the seedbox, not some octal thing) and can not be deleted by my user on my server. After changing permissions on the download folder, I can delete them. Also, I have given all users permissions to read/write in the samba folder upon sharing it.

So my question is this: Is it possible through some elegant command executed to make rsync change user/permissions on the files when downloading it? Or is it possible to make the folder function in a way that all new files will automatically change user when copied/moved to it? I guess I could put the chmod command in sudo cron to run every once in a while to change the owner of the files, but since sometimes the amount of data to be downloaded can be rather large, it is difficult to know when to trigger it in relation to the rsync-job to make sure all files are downloaded.

Answer 1

rsync only preserves the owner if you ask it to with -o — otherwise files will be owned by the user running the rsync command, just like when any other files are created. -a includes -o, however, so lots of common rsync command lines include it. man rsync includes a passage on this explicitly:

For example: if you want to use -a (--archive) but don’t want -o
(--owner),  instead  of  converting  -a  into -rlptgD, you could
specify -a --no-o (or -a --no-owner).

So instead of rsync -a source dest you can use rsync -a --no-o source dest to have files be owned by the user running the command.

On the other hand, you can usually only change the owner of a file if you're root, so this doesn't come up much. If it's necessary to run this job as root for some reason, and you want the files to be owned by your normal user rather than root, you can use the --chown option:

rsync -a --chown=youruser:yourgroup ...

There is also a --usermap option for more complicated mappings, if you do want to keep some users. It takes a comma-separated list of from:to pairs.

As a final option, since you're apparently running rsync from a cron job, you can just append the owner/permissions-changing operation to the cron job with && chown ....

Answer 2

I tested some ways but in my case the result of e.g. this script

rsync -a -v --progress --modify-window=1 -c -b -i -s -m --del -vv --ignore-errors --chmod=ugo=rwx --delete --delete-excluded  --exclude='*~'  --exclude='.*' --backup-dir=.rsync_bak /home/test /media/user/usb_ext4

was that the permission cannot be wider than the permission of the partition / target where the file should be written to. (Check those permissions after mounting the device)