Transient /etc breaks finding current booted deployment

[alexlarsson]

In ostree-sysroot.c:parse_deployment we stat the current root and /etc, and compare the dev+inode with the deploy dir to find the currently booted deployment. The stat of /etc was added to handle the composefs case, as in that case the root is not bind-mounted.

However in the case of composefs+transient_etc, even the etc subdirectory isn't a bind-mount, so we fail to detect that a deployment is current. I guess we need a different approach for this case.

[alexlarsson]

I wonder if we should just bind mount the deploy dir in /run/ostree/.private at boot and stat that.

[alexlarsson]

Surely this affects layered root as well (root is an overlayfs dir)?

[alexlarsson]

Fixed by #3164