Unable to successfully reset root password using rescue mode

[miabbott]

When trying to follow the instructions on resetting the root password using rescue mode, I found that I'm unable to login with my user account or root account afterwards.

1. Using a fresh Silverblue 39 install, I appended rw init=/bin/bash to the linux line in the boot entry.
2. I used passwd to configure the root password from the resulting shell.
3. Because touch /.autorelabel does not work with ostree-based hosts, I tried using /sbin/restorecon -v /etc/{passwd,shadow} (see https://github.com/coreos/fedora-coreos-docs/pull/48) to fix any SELinux labeling before using /sbin/reboot -f.
4. After rebooting, my user login and root login no longer worked.

I was unable to observe any errors on the console during the login attempts.

[miabbott]

Based on investigations in https://github.com/ublue-os/main/issues/469, one set of instructions that seem to work for resetting normal user passwords and the root password are:

1. Edit grub entry and add rd.break enforcing=0 to the end of it
2. mount -o remount rw /sysroot
3. /sysroot/usr/sbin/chroot /sysroot
4. passwd [your username here]
5. Continue booting your system
6. Run restorecon /etc/shadow as root
7. setenforce 1 to re-enable SELinux

I'm not sure if this is the best way to achieve the results, but it appears to be successful.

[noelmiller]

Thanks to Colin, there is also another option and will be simpler to execute: https://github.com/ublue-os/main/issues/469#issuecomment-1885264886