[Bug 1718055] [NEW] update-initramfs fails for MODULES=dep when root is on LVM wich uses nvme device

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[impact]

On a trusty system, if using MODULES=dep with lvm-on-nvme then update-
initramfs fails to rebuild the initramfs.  This prevents using
MODULES=dep for building an initramfs on trusty, with a rootfs that uses
lvm on nvme.

[test case]

install a system where the rootfs uses a LVM logical volume that is
located on a physical volume on a NVMe drive.  Edit the /etc/initramfs-
tools/initramfs.conf file and change the MODULES line to MODULES=dep and
save the file.  Then run sudo update-initramfs -u which will fail with:

$ sudo update-initramfs -u
update-initramfs: Generating /boot/initrd.img-3.13.0-129-generic
mkinitramfs: for root /dev/dm-0 missing nvme /sys/block/ entry
mkinitramfs: workaround is MODULES=most
mkinitramfs: Error please report the bug
update-initramfs: failed for /boot/initrd.img-3.13.0-129-generic with 1.


[regression potential]

This changes initramfs creation for rootfs that are on nvme or lvm, so
has the potential to break it for any system with its rootfs on either
or both of those.  It is likely to only break initramfs creation, not
system booting.

[other info]

related to bug 1532146

** Affects: initramfs-tools (Ubuntu)
     Importance: Medium
     Assignee: Dan Streetman (ddstreet)
         Status: In Progress


** Tags: patch
-- 
update-initramfs fails for MODULES=dep when root is on LVM wich uses nvme device
https://bugs.launchpad.net/bugs/1718055
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