Bug#773173: grub2: Support generating entry menus for other supported init system in advanced mode

[Didier Roche]

Source: grub2
Version: 2.02~beta2-18
Severity: wishlist

Dear Maintainer,

It would be good to have the option to other supported init system for linux
in the advanced option entry.

We should only list installed init systems that are not set as the 
default, as
well as supporting various way of being set as default (either by GRUB 
variables
or with init symlinks).

Note that OS vendor may have a different supported init system (ubuntu
would only support, and thus list, upstart and systemd for instance)

Please find attached a patch supporting that. I used git-dpm to generate 
it, but not really familiar with this tool yet (seems that it's showing 
in the main branch after git-dpm dch as if it was inline and hides 
debian/patches/<patch_name>, so I hope this is all correct.


-- System Information:
Debian Release: jessie/sid
   APT prefers vivid-updates
   APT policy: (500, 'vivid-updates'), (500, 'vivid-security'), (500, 
'vivid'), (400, 'vivid-proposed')
Architecture: amd64 (x86_64)
Foreign Architectures: i386

Kernel: Linux 3.16.0-25-generic (SMP w/4 CPU cores)
Locale: LANG=fr_FR.UTF-8, LC_CTYPE=fr_FR.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)

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