Comment 0 for bug 1293811

Some time in the last year or so casper appears to have stopped wanting to boot off HDD devices. It previously was able to by setting UUID= on the command line or by having a common casper-uuid-generic.conf to the initrd that was booted.

I've tried to narrow this down a little bit, and I believe the problem is in:

is_nice_device

Previously, udev would be queried to determine if the given device matched this path:

usb|pci-[^-]*-(ide|sas|scsi|usb|virtio)|platform-sata_mv|platform-orion-ehci|platform-mmc|platform-mxsdhci|platform-omap_hsmmc|platform-sdhci-tegra|platform-tegra-ehci

Unfortunately according to bug https://bugs.launchpad.net/ubuntu/+source/systemd/+bug/1193705 the by-path mechanism used by udev no longer works.

This does match the behavior I see that the command in question in the busted initrd prompt doesn't output anything useful like it used to.