Bug#842091: autopkgtest-virt-qemu: better support for read-only rootfs

[Simon McVittie]

Package: autopkgtest
Version: 4.1
Severity: wishlist
Tags: patch

A project I'm currently working on uses a read-only root filesystem
under normal circumstances, mounting it rw only when an upgrade is
desired. This makes autopkgtest fail horribly when testing our disk
images, which is (at least mostly) addressed by the patches I've
attached here. Please consider.

Thanks,
    S

-- System Information:
Debian Release: stretch/sid
  APT prefers unstable-debug
  APT policy: (500, 'unstable-debug'), (500, 'unstable'), (500, 'testing'), (500, 'stable'), (1, 'experimental-debug'), (1, 'experimental')
Architecture: amd64 (x86_64)
Foreign Architectures: i386

Kernel: Linux 4.7.0-1-amd64 (SMP w/4 CPU cores)
Locale: LANG=en_GB.utf8, LC_CTYPE=en_GB.utf8 (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       1.3.1
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>
ii  qemu-system  1:2.7+dfsg-1
ii  qemu-utils   1:2.7+dfsg-1
ii  schroot      1.6.10-2+b1

-- no debconf information
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