Lennart Poettering
3690bfb5b2
This creates a new dir /run/systemd/mount-rootfs/ early in PID 1 that thus always exists. It's supposed to be used by any code that creates its own mount namespace and then sets up a new root dir to switch into. So far in many cases we used a temporary dir (which needed explicit clean-up) or a purpose-specific fixed dir. Let's create a common dir instead, that always exists (as it is created in PID 1 early on, always). Besides making things more robust, as manual clean-up of the inode is not necessary anymore this also opens the door for unprivileged programs to use the same dir, since it now always exists. Set the access mode to 555 (instead of the otherwise previously used 0755, 0700 or similar), so that unprivileged programs can access it, but we make clear it's not supposed to be written directly to, by anyone, not even root.
System and Service Manager
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