[bug #43653] grub-probe fails to find ZFS VDEVs in /dev/mapper

[Bart Kus]

Follow-up Comment #2, bug #43653 (project grub):

ii  libzfs2                        0.6.3-1~wheezy                amd64       
Native ZFS filesystem library for Linux
ii  libnvpair1                     0.6.3-1~wheezy                amd64       
Solaris name-value library for Linux

Debian is reporting those libs as installed.  However, I see they're coming
from zfsonlinux.org and not from the Debian repo, whereas grub is coming from
the Debian repo, so it's not linked against these libs:

address@hidden:~# ldd /usr/sbin/grub-probe
        linux-vdso.so.1 (0x00007fffb53a1000)
        libdevmapper.so.1.02.1 => /lib/x86_64-linux-gnu/libdevmapper.so.1.02.1
(0x00007fe77abc4000)
        libc.so.6 => /lib/x86_64-linux-gnu/libc.so.6 (0x00007fe77a81b000)
        libselinux.so.1 => /lib/x86_64-linux-gnu/libselinux.so.1
(0x00007fe77a5f5000)
        libudev.so.1 => /lib/x86_64-linux-gnu/libudev.so.1
(0x00007fe77a3e6000)
        libpthread.so.0 => /lib/x86_64-linux-gnu/libpthread.so.0
(0x00007fe77a1c9000)
        /lib64/ld-linux-x86-64.so.2 (0x00007fe77ae14000)
        libpcre.so.3 => /lib/x86_64-linux-gnu/libpcre.so.3
(0x00007fe779f5a000)
        libdl.so.2 => /lib/x86_64-linux-gnu/libdl.so.2 (0x00007fe779d56000)
        librt.so.1 => /lib/x86_64-linux-gnu/librt.so.1 (0x00007fe779b4e000)

Glad to hear the support exists and will come into distros with time. 
However, I still think it'd be a good idea for grub-probe to be more thorough
about finding devices in /dev sub-dirs when it falls back to the zpool method.

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