Bug#810808: initramfs-tools: lvm on NVMe boot drives brakes mkinitramfs

[Bjoern Laessig <b.laessig@pengutronix.de>]

Package: initramfs-tools
Version: 0.120
Severity: normal
Tags: d-i patch

Dear Maintainer,

while trying installing debian 8.2 onto a PCIe SSD (NVMe device) the
creation of the initrd is failing.

root@holodeck10:~# apt-get install -f.                                           
Reading package lists... Done                                                    
Building dependency tree.......                                                  
Reading state information... Done                                                
0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.                   
3 not fully installed or removed.                                                
After this operation, 0 B of additional disk space will be used.                 
Setting up linux-image-3.16.0-4-amd64 (3.16.7-ckt20-1+deb8u2) ...                
/etc/kernel/postinst.d/initramfs-tools:                                          
update-initramfs: Generating /boot/initrd.img-3.16.0-4-amd64                     
mkinitramfs: for device /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-3.16.0-4-amd64 with 1.             
run-parts: /etc/kernel/postinst.d/initramfs-tools exited with return code 1      
Failed to process /etc/kernel/postinst.d at /var/lib/dpkg/info/linux-image-3.16.0-4-amd64.postinst line 634.
dpkg: error processing package linux-image-3.16.0-4-amd64 (--configure):         
 subprocess installed post-installation script returned error exit status 1      

i found the missing support in /usr/share/initramfs-tools/hook-functions

This patch fixes the problem:

--- /usr/share/initramfs-tools/hook-functions   2016-01-12 14:36:21.471588490 +0100
+++ hook-functions.orig 2016-01-12 14:28:29.675566666 +0100                      
@@ -364,10 +364,9 @@                                                             
        if [ "${block#md}" != "${block}" ]; then                                 
            block=$(sed -ne 's/multipath/[/' -e 's/linear/[/' -e 's/raid[0-9][0-9]*/[/' -e 's/\([hs]d[a-z][a-z]*\)[0-9][0-9]*/\1/g' -e '/^'${block}'
:/s/^[^[]*\[ \([^\[]*\)\[.*$/\1/p' </proc/mdstat)
        fi                                                                       
-       # luks or lvm on cciss or ida or nvme                                    
+       # luks or lvm on cciss or ida                                            
        if [ "${block#cciss}" != "${block}" ] \                                  
-       || [ "${block#ida}" != "${block}" ] \                                    
-       || [ "${block#nvme}" != "${block}" ] ; then                              
+       || [ "${block#ida}" != "${block}" ]; then                                
            block="${block%p*}"                                                  
        else                                                                     
            block=${block%%[0-9]*}