[systemd-devel] /etc/machine-id handling in a non-initrd / embedded environment ?!?!

[Holger Schurig]

I was in error about this:

> 3. Now it tries to generate a machine ID and tries to write it into
> /run/machine-id. Again this fails, because /run is still on the same
> partition as /, and it is still not writable. FAIL !

When there is no writable or readable /etc/machine-id, then it won't
even try to generate one, as this code here bails out with a "return
-errno;":

                fd = open("/etc/machine-id",
O_RDWR|O_CREAT|O_CLOEXEC|O_NOCTTY, 0444);
                if (fd >= 0)
                        writable = true;
                else {
                        fd = open("/etc/machine-id",
O_RDONLY|O_CLOEXEC|O_NOCTTY);
                        if (fd < 0) {
                                log_error("Cannot open /etc/machine-id: %m");
                                return -errno;
                        }

                        writable = false;
                }