[Libguestfs] [nbdkit PATCH 0/4] Fix testsuite hang with nbd-stadalone

[Eric Blake]

Either patch 1 or patch 2 in isolation is sufficient to fix the
problem that Rich forwarded on from an archlinux tester (name so I can
credit them?).  But both patches should be applied, as well as
backported to appropriate stable branches, to maximize cross-version
interoperability of nbdkit vs. plugins.  Patch 3 will let us detect
future similar bugs much faster.  I want patch 4 to ensure that we
guarantee our API in the future, but it isn't finished yet.

Then I still need to follow up with my threat to remove nbd-standalone
for 1.20 (relying on libnbd is a lot easier now than it was when we
first added optional libnbd support in 1.14).

Eric Blake (4):
  server: Normalize plugin can_* values
  nbd: Normalize return values of can_*
  tests: Don't let test-parallel-* hang on nbdkit bug
  RFC tests: Add test to cover unusual .can_flush return

 tests/Makefile.am            |  21 +++++++
 server/plugins.c             |  24 ++++---
 plugins/nbd/nbd-standalone.c |  12 ++--
 tests/test-flush.sh          |  85 +++++++++++++++++++++++++
 tests/test-parallel-file.sh  |  19 +++---
 tests/test-parallel-nbd.sh   |  13 ++--
 tests/test-parallel-sh.sh    |  19 +++---
 tests/test-flush-plugin.c    | 119 +++++++++++++++++++++++++++++++++++
 8 files changed, 275 insertions(+), 37 deletions(-)
 create mode 100755 tests/test-flush.sh
 create mode 100644 tests/test-flush-plugin.c

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2.25.1