contrib/dracut: 90: mount essential datasets under root
This partly mirrors what the i-t script does (though that mounts all
children, recursively) ‒ /etc, /usr, /lib*, and /bin are all essential,
if present, to successfully invoke the real init, which will then mount
everything else it might need in the right order
The following extreme-case set-up boots w/o issues now:
/ zoot zfs rw,relatime,xattr,noacl ├─/etc zoot/etc zfs rw,relatime,xattr,noacl ├─/usr zoot/usr zfs rw,relatime,xattr,noacl │ └─/usr/local zoot/usr/local zfs rw,relatime,xattr,noacl ├─/var zoot/var zfs rw,relatime,xattr,noacl │ ├─/var/lib zoot/var/lib zfs rw,relatime,xattr,noacl │ ├─/var/log zoot/var/log zfs rw,relatime,xattr,posixacl │ ├─/var/cache zoot/var/cache zfs rw,relatime,xattr,noacl │ └─/var/tmp zoot/var/tmp zfs rw,relatime,xattr,noacl ├─/home zoot/home zfs rw,relatime,xattr,noacl │ └─/home/nab zoot/home/nab zfs rw,relatime,xattr,noacl ├─/boot zoot/boot zfs rw,relatime,xattr,noacl ├─/root zoot/home/root zfs rw,relatime,xattr,noacl ├─/opt zoot/opt zfs rw,relatime,xattr,noacl └─/srv zoot/srv zfs rw,relatime,xattr,noacl
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Ahelenia Ziemiańska <nabijaczleweli@nabijaczleweli.xyz>
Closes #11898