[PATCH v3 00/13] Improve reliability of VM tests

[John Snow]

Note: patches 11-13 are included for testing simplicity, they shouldn't
be merged. They will be included in a forthcoming block PR.

This patch series attempts to improve the reliability of several of the
VM test targets. In particular, both CentOS 8 tests are non-functional
because CentOS 8 was EOL at the beginning of this calendar year, with
repositories and mirrors going offline.

I also remove the ubuntu.i386 test because we no longer support Ubuntu
18.04 nor do we have explicit need of an i386 build test.

After this series, I am able to successfully run every VM target on an
x86_64 host, except:

- ubuntu.aarch64: Hangs often during testing, see below.
- centos.aarch64: Hangs often during testing, see below.
- haiku.x86_64: Build failures not addressed by this series, see
  https://lists.gnu.org/archive/html/qemu-devel/2022-06/msg02103.html

The unit tests that I see fail most often under aarch64 are:

- virtio-net-failover: Seems to like to hang on openbsd
- migration-test: Tends to hang under aarch64 tcg

Future work (next version? next series?);

- Try to get centos.aarch64 working reliably under TCG
- Upgrade ubuntu.aarch64 to 20.04 after fixing centos.aarch64
- Fix the Haiku build test, if possible.
- Ensure I can reliably run and pass "make vm-build-all".
  (Remove VMs from this recipe if necessary.)

John Snow (12):
  qga: treat get-guest-fsinfo as "best effort"
  tests/vm: use 'cp' instead of 'ln' for temporary vm images
  tests/vm: switch CentOS 8 to CentOS 8 Stream
  tests/vm: switch centos.aarch64 to CentOS 8 Stream
  tests/vm: update sha256sum for ubuntu.aarch64
  tests/vm: remove ubuntu.i386 VM test
  tests/vm: remove duplicate 'centos' VM test
  tests/vm: add 1GB extra memory per core
  tests/vm: upgrade Ubuntu 18.04 VM to 20.04
  tests/vm: Remove docker cross-compile test from CentOS VM
  tests/qemu-iotests: hotfix for 307, 223 output
  tests/qemu-iotests: skip 108 when FUSE is not loaded

Vladimir Sementsov-Ogievskiy (1):
  iotests: fix copy-before-write for macOS and FreeBSD

 qga/commands-posix.c                       |   7 +-
 tests/qemu-iotests/108                     |   5 +
 tests/qemu-iotests/223.out                 |   4 +-
 tests/qemu-iotests/307.out                 |   4 +-
 tests/qemu-iotests/tests/copy-before-write |   5 +
 tests/vm/Makefile.include                  |   5 +-
 tests/vm/basevm.py                         |   5 +
 tests/vm/centos                            |   9 +-
 tests/vm/centos.aarch64                    | 174 +++------------------
 tests/vm/ubuntu.aarch64                    |  10 +-
 tests/vm/ubuntu.i386                       |  40 -----
 11 files changed, 62 insertions(+), 206 deletions(-)
 delete mode 100755 tests/vm/ubuntu.i386

-- 
2.34.3