Le 07/01/2020 à 15:28, Kenneth Parker a écrit :
As far as I know, it's mounted ro, so that initrd can check if it is okay
Nonsense. The initramfs can check the root filesystem before mounting it, so it does not need to mount it read-only.
(via fsck). And initrd is then supposed to remount it rw.
I don't think so. If you change the default final init with something like init=/bin/bash for example, you can see that the root filesystem is still mounted read-only. So something in the init system remounts it read-write. With sysvinit it is done in checkroot.sh according to mount options in fstab. I don't know about systemd.