Bug#839072: autopkgtest: Allow for GitHub-style PR urls

[Barry Warsaw]

Package: autopkgtest
Version: 4.0.5
Severity: wishlist

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Dear Maintainer,

As we've been discussing, it would be nice if you could run
autopkgtest against GitHub-style pull requests.  There's no direct URL
that would allow you to do this, but you can support this by doing a
git fetch after the initial clone, e.g.:

$ git clone https://github.com/CanonicalLtd/ubuntu-image.git
$ cd ubuntu-image
$ git fetch origin +refs/pull/68/merge
$ git checkout -qf FETCH_HEAD

So the idea then is to allow URLs that can additionally specify that
PR ref.  Then I could run autopkgtest like so:

$ autopkgtest https://github.com/CanonicalLtd/ubuntu-image.git+refs/pull/68/merge -- schroot yakkety-amd64

Notice the '+' separating the .git URL from the PR refspec.

I'm not sure this is the best possible syntax, and I'd like to be able
to support GitLab PRs too, which apparently don't use a + or the same
refspec for their merge requests, although the same general
implementation (clone then fetch) *should* work.  

I thought about maybe using a '@' or some other unexpected delimiter
to separate the .git URL from the PR specification.  I'll play with a
GitLab MR to see what works best, but that would be an easy change.

I have a hack that works for GitHub, which I'll send along shortly.

- -- System Information:
Debian Release: stretch/sid
  APT prefers unstable
  APT policy: (500, 'unstable')
Architecture: amd64 (x86_64)

Kernel: Linux 4.7.0-1-amd64 (SMP w/8 CPU cores)
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)

Versions of packages autopkgtest depends on:
ii  apt-utils       1.3
ii  libdpkg-perl    1.18.10
ii  procps          2:3.3.12-2
ii  python3         3.5.1-4
ii  python3-debian  0.1.29

Versions of packages autopkgtest recommends:
ii  autodep8  0.8

Versions of packages autopkgtest suggests:
pn  lxc          <none>
pn  lxd-client   <none>
pn  qemu-system  <none>
pn  qemu-utils   <none>
ii  schroot      1.6.10-2+b1

- -- no debconf information

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