[PATCH 0/7] tests/qtest: fix the disk tests on a host with a small /tmp

["Denis V. Lunev" <den@openvz.org>]

John reported ide-test dying at startup in the NetBSD VM:

  ERROR:../src/tests/qtest/ide-test.c:1260:main: assertion failed:
  (ret == 0)

The hypothesys is that the ftruncate() of a 64 MiB scratch image. NetBSD
mounts /tmp as a tmpfs sized at 25% of RAM and charges a file its full
length themoment it is extended, so a sparse image is not free there and
the call returns ENOSPC. The assert dates to 2013, nothing regressed.

The series is designed to do two things:
* reduce the amount of space needed switching to QCOW2
* tolerate the failure skipping the test if there is not enough space

Patches 1-4 skip instead of aborting, the way hd-geo-test has since
a0d6d7454a. Patches 5-7 build the images with qemu-img where only the
virtual size matters: peak scratch space goes from 129 MiB to 1.6 MiB
for ide-test and from 4126 MiB to 1.5 MiB for hd-geo-test.

Hope this should help. John, can you give a try to this in the test?
I do not have NetBSD handy and will start with this tomorrow if you
will share guest config.

Cc: John Snow <jsnow@redhat.com>
Cc: Thomas Huth <thuth@redhat.com>
Signed-off-by: Denis V. Lunev <den@openvz.org>

Denis V. Lunev (7):
  tests/qtest/libqos: let mkqcow2() report failure
  tests/qtest/ide-test: skip when the scratch files cannot be created
  tests/qtest/ahci-test: skip when the scratch files cannot be created
  tests/qtest/hd-geo-test: skip when the scratch file cannot be created
  tests/qtest/libqtest: create images with a byte-precise size
  tests/qtest/ide-test: build the shared disks with qemu-img
  tests/qtest/hd-geo-test: build the test images with qemu-img

 tests/qtest/ahci-test.c        |  48 ++++++++---
 tests/qtest/hd-geo-test.c      | 145 ++++++++++++++++++++++-----------
 tests/qtest/ide-test.c         |  96 +++++++++++++++++-----
 tests/qtest/libqos/libqos.c    |   4 +-
 tests/qtest/libqos/libqos.h    |   2 +-
 tests/qtest/libqtest.c         |   9 +-
 tests/qtest/libqtest.h         |  12 +++
 tests/qtest/virtio-scsi-test.c |   5 +-
 8 files changed, 237 insertions(+), 84 deletions(-)

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2.53.0