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I have a partition mounted to /home and want to mount another partition as $HOME/Steam. The /home partition is encrypted and only mounted at login (not by fstab btw), while the Steam partition is not and fstab will mount it directly at boot. When I log in, the home partition will be mounted over it and hide its content. It will appear to be empty.
How do I tell fstab to wait for the other partition?
You can't, sorry.
The encrypted filesystem is mounted by something like pam_mount or pam_ecryptfs. This happens after the boot process. This mount unit won't be part of the boot "transaction", and therefore ordering dependencies on it will have no effect on boot.
The best you can do is mount the partition, and then create a symbolic link file. (ln -s $HOME/Steam /mnt/Steam).
If you want the Steam filesystem to be more private, make the real mount point something like /mnt/$USER/Steam, and set permissions on /mnt/$USER using chmod o-rwx.
/mnt/Steam directly in that case.
– sourcejedi
Mar 21 '18 at 10:55
fstab, use.mountunits. That should also take care of your dependency problem because "If a mount unit is beneath another mount unit in the file system hierarchy, both a requirement dependency and an ordering dependency between both units are created automatically." – don_crissti Mar 19 '18 at 17:31