[bug #42392] Build failure when ZFS support is enabled

[René Bertin]

Follow-up Comment #1, bug #42392 (project grub):

Note that even with the posted patch that allows the build to succeed, not all
FS tests succeed, in particular zfs_test. It fails with a TIME_FAIL error
(which is probably benign as it appears to concern a subsecond difference).

Worse, update-grub2 will not generate a proper grub.cfg for ZFS roots:

menuentry 'Ubuntu' --class ubuntu --class gnu-linux --class gnu --class os
$menuentry_id_option 'gnulinux-simple-b927688a3f8a6e13' {
     recordfail
     load_video
     gfxmode $linux_gfx_mode
     insmod gzio
     insmod part_msdos
     insmod btrfs
     set root='hd2,msdos4'
     if [ x$feature_platform_search_hint = xy ]; then
       search --no-floppy --fs-uuid --set=root --hint-bios=hd2,msdos4
--hint-efi=hd2,msdos4 --hint-baremetal=ahci2,msdos4 
2def3c9f-2a12-41e0-911f-7de7cc142a99
     else
       search --no-floppy --fs-uuid --set=root
2def3c9f-2a12-41e0-911f-7de7cc142a99
     fi
     linux     /vmlinuz-3.13.9-ck1-kubuntu-ck-amdf10-rjvb root=ZFS=zPatux/ ro
     initrd    /initrd.img-3.13.9-ck1-kubuntu-ck-amdf10-rjvb
}
}}}

In other words, the required zfs modules are not loaded, and the kernel isn't
informed about the fact it's booting off ZFS. A more correct entry should
read:

{{{
menuentry 'Ubuntu' --class ubuntu --class gnu-linux --class gnu --class os
$menuentry_id_option 'gnulinux-simple-b927688a3f8a6e13' {
     recordfail
     load_video
     gfxmode $linux_gfx_mode
     insmod gzio
     insmod zfsinfo
     zfs-bootfs ($root) bootfs
     insmod part_msdos
     insmod btrfs
     set root='hd2,msdos4'
     if [ x$feature_platform_search_hint = xy ]; then
       search --no-floppy --fs-uuid --set=root --hint-bios=hd2,msdos4
--hint-efi=hd2,msdos4 --hint-baremetal=ahci2,msdos4 
2def3c9f-2a12-41e0-911f-7de7cc142a99
     else
       search --no-floppy --fs-uuid --set=root
2def3c9f-2a12-41e0-911f-7de7cc142a99
     fi
     linux     /vmlinuz-3.13.9-ck1-kubuntu-ck-amdf10-rjvb root=ZFS=zPatux/ ro 
boot=zfs $bootfs
     initrd    /initrd.img-3.13.9-ck1-kubuntu-ck-amdf10-rjvb
}
}}}

but even that gives an "invalid label" error upon boot and then tries to
import the default pool name, rpool, instead of the right one.

For reference, here's a menuentry from a different system (using the exact
same kernel) which boots OK:

{{{
menuentry 'LinuxMint GNU/Linux' --class linuxmint --class gnu-linux --class
gnu --class os $menuentry_id_option 'gnulinux-simple-7c11ad880751a42a' {
        load_video
        gfxmode $linux_gfx_mode
        insmod gzio
        insmod zfsinfo
        zfs-bootfs ($root) bootfs
        insmod part_msdos
        insmod ext2
        set root='hd0,msdos7'
        if [ x$feature_platform_search_hint = xy ]; then
          search --no-floppy --fs-uuid --set=root --hint-bios=hd0,msdos7
--hint-efi=hd0,msdos7 --hint-baremetal=ahci0,msdos7 
39ff79e1-e153-490f-b302-4ba8e71fe643
        else
          search --no-floppy --fs-uuid --set=root
39ff79e1-e153-490f-b302-4ba8e71fe643
        fi
        linux   /vmlinuz-3.13.9-ck1-kubuntu-ck-amdf10-rjvb root=ZFS=Patux/ ro
boot=zfs $bootfs   
        initrd  /initrd.img-3.13.9-ck1-kubuntu-ck-amdf10-rjvb
}
}}}

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