I have an embedded device that on extremely rare occasions will have a dirty root filesystem. System-D will halt boot with:

Give root password for maintainence
(or type control-D to continue):

These situations are very rare and can be solved by doing the following after entering the root password:

# mount -o remount,ro /
# fsck /dev/mmcblk1p3 

Is there anyway to automate this or even try to perform the cleaning when the filesystem is in use?

CodePudding user response：

You can overwrite systemd emergency mode by editing the appropriate Unit file (or just systemctl edit emergency.service).

You can then add something like this:

[Service]
ExecStartPre=/bin/sh -c "mount -o remount,ro / && fsck /dev/mmcblk1p3 && /bin/systemctl reboot"