I'm trying to set up a Raspberry Pi to run BitTorrent Sync to back up my files to an external hard drive, but I'm running into some frustrating issues.
First, I need to set up the USB hard drive to auto-mount on boot, because the power frequently goes out where I live. So, I added a line to /etc/fstab
/dev/sda1 /media/josiah vfat defaults 0 0
I rebooted, and it mounted the drive, but then btsync couldn't write to it. So, I did a little reading and found that you have to specify the user option, so I tried this;
/dev/sda1 /media/josiah vfat defaults,user 0 0
That didn't seem to work either, so I tried specifying all of the defaults manually
/dev/sda1 /media/josiah vfat rw,auto,user,async,suid,dev,exec 0 0
I thought it was working, but then btsync started complaining again that it couldn't write to the drive, and when I tried to unmount it as a normal user it said that only a super user can unmount the drive.
That's confusing to me, since I thought that's what the user option was for. What am I missing, or doing wrong?
Answer
You can do a chmod after you mounted the partition, but that wouldn't be persistent accross reboots.
You should try this fstab line:
/dev/sda1 /media/josiah vfat user,umask=0000 0 0
Or this mount options:
mount -t vfat -ouser,umask=0000 /dev/sda1 /media/josiah
That will make the mounted partition world readable and writable.
If you need a less permissive setup, you should create a new group and mount as follows:
mount -t vfat -ouser,gid=1010,umask=0007 /dev/sda1 /media/josiah
It assumes your new group's gid is 1010. All users that need access to the mountpoint will need to be added to the new group.
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