[DRE-maint] backporting vagrant to jessie

[Hans-Christoph Steiner]

Hey all,

Thanks for packaging vagrant and all that ruby stuff! I have gotten
vagrant working to set up nested QEMU-KVM instances, so that we can run
tests that set up a QEMU-KVM guest in jenkins.debian.net, which itself
is a QEMU-KVM guest instance.  I have this all working well in stretch,
but jessie does not have vagrant-libvirt, so its a showstopper.

I have already backported everything that vagrant-libvirt needs on my
machine.  I tried backporting vagrant itself, and got an error that
seems beyond me.  I don't know ruby at all.

# dpkg -i vagrant_1.8.5+dfsg-2_all.deb
Selecting previously unselected package vagrant.
(Reading database ... 24076 files and directories currently installed.)
Preparing to unpack vagrant_1.8.5+dfsg-2_all.deb ...
Unpacking vagrant (1.8.5+dfsg-2) ...
dpkg: dependency problems prevent configuration of vagrant:
 vagrant depends on ruby-bundler (>= 1.12.5); however:
  Package ruby-bundler is not installed.

dpkg: error processing package vagrant (--install):
 dependency problems - leaving unconfigured
Processing triggers for man-db (2.7.0.2-5) ...
Errors were encountered while processing:

The following packages have unmet dependencies:
 ruby-bundler : Breaks: bundler (< 1.11.2-1~) but 1.7.4-1 is to be installed
 vagrant : Depends: ruby-bundler (>= 1.12.5) but 1.11.2-1~bpo8+1 is to
be installed

Any advice on how to proceed?

.hc