fn get_physical_root_and_run() -> Result<(Dir, Dir, bool)>Expand description
Open the physical root (/sysroot) and /run directories for a booted system.
The returned boolean is true if /sysroot is on a physically read-only
medium (e.g. a live ISO) that cannot be remounted writable.
Note that ostree mounts /sysroot read-only by default even on writable
systems and remounts it writable on demand, so being read-only is not by
itself meaningful: we only conclude the system is read-only if a remount
attempt fails and the backing block device confirms it.