On Tue, Jul 24, 2012 at 4:32 PM, Tom Gundersen [off-list ref] wrote:

On Tue, Jul 24, 2012 at 4:16 PM, Johannes Berg
[off-list ref] wrote:

quoted

quoted

The logic to tell udev that it runs in the initramfs could easily be
implemented by other initramfs tools than dracut, but they usually do
not really follow what we do here, so this might for now only work on
recent systems using dracut.

Ok, too bad there wasn't a generic way, but at least there's a way
now :-)

If I understand the code correctly, it should be enough to put a file
/etc/initrd-release in the initramfs for udev to do the right thing.
But please correct me if I'm wrong Kay.

The current check in udev/systemd is the existence of:
  /etc/initrd-release
and the / filesystem must be tmpfs/ramfs to get the environment
recognized as 'initrd'.

Kay