I use rsync to sync directories between machines but one of my machines kept screwing up the permissions, I finally get time to track the “Operation not permitted” issue and it turned out to my vfat backup drive not being mounted under the right uid.
Coming from the old school Unix background, I thought updating /etc/fstab would be enough but due to this auto mount system it is done differently 😉 …
It turns out you need to change the rules for the auto mount via file /etc/udev/rules.d/11-media-by-label-auto-mount.rules
So what did I need to change? Well it turned out to be simple uid= to match the uid of my normal user (use id xxx, where xxx is your username)
Below are the changes:
ACTION=="add", ENV{ID_FS_TYPE}=="vfat|ntfs",
ENV{mount_options}="$env{mount_options},utf8,
uid=501,gid=100,umask=002"
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