efivar-0.21 fails to create boot entry when device min number > 127, breaks efibootmgr

[Andy Sayler]

This bug has also been reported and fixed on github, but is present in the version of libefivar0 present in Ubuntu 15.10:

https://github.com/rhinstaller/efivar/issues/33

This bug breaks efibootmgr when trying to setup an EFI boot entry for a device with a minor number > 127:

E.g.

$ sudo efibootmgr --create --disk /dev/sdk --part 1 --label "GRUB2 Shim" --loader "\\EFI\\ubuntu\\shimx64.efi"
efibootmgr: Could not set variable: No such file or directory
efibootmgr: Could not prepare boot variable: No such file or directory

$ lsblk
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
sdk 8:160 1 3.8G 0 disk
└─sdk1 8:161 1 1G 0 part /boot/efi

This also seems to break Ubuntu 15.10 upgrades and install on system where the EFI boot device has a minor number >127.

ProblemType: Bug
DistroRelease: Ubuntu 15.10
Package: libefivar0 0.21-1
ProcVersionSignature: Ubuntu 4.2.0-16.19-generic 4.2.3
Uname: Linux 4.2.0-16-generic x86_64
NonfreeKernelModules: zfs zunicode zcommon znvpair zavl
ApportVersion: 2.19.1-0ubuntu3
Architecture: amd64
Date: Fri Oct 23 17:41:28 2015
Dependencies:
 gcc-5-base 5.2.1-22ubuntu2
 libc6 2.21-0ubuntu4
 libgcc1 1:5.2.1-22ubuntu2
InstallationDate: Installed on 2014-04-27 (544 days ago)
InstallationMedia: Ubuntu-Server 14.04 LTS "Trusty Tahr" - Release amd64 (20140416.2)
ProcEnviron:
 TERM=xterm-256color
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: efivar
UpgradeStatus: Upgraded to wily on 2015-10-23 (0 days ago)

[Mario Limonciello (superm1)]

This has been fixed in the current version in 16.04 per that upstream commit. 16.04 is carrying 0.23 release.