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The original version of the test used netcat along with a standard
AF_UNIX socket, which caused issues across different netcat
implementations. The AF_UNIX socket was then replaced by a FIFO with a
simple echo, which, however, suffers from the same issue (some echo
implementations don't check if the write() was successful).
Let's revert back to the AF_UNIX socket, but replace netcat with socat,
which, hopefully, resolves the main issue.
Relevant commit: 9b45c2bf02
Not all distros support booting without an initrd. E.g. the Debian
kernel builds ext4 as a module and so relies on an initrd to
successfully start the QEMU-based images.
Apparently there are a myriad of netcat implementations around, and they
all behave slightly differently. The one I have on my Fedora 27
installation will cause a failure when invoked as "nc -U" on an AF_UNIX
socket whose connections are immediately disconnected, thus causing the
test to fail.
Let's avoid all ambiguities in this regard, and drop usage of netcat
altoegther. Instead let's use a FIFO in the file system, which we can
connect to with only shell commands, and is hence much simpler and
more reliable to test with.
The actual test is supposed to validate that PID 1 doesn't hang when
activation of a socket-activated service fails, hence which transport
mechanism is used ultimately doesn't matter, as long as we activate the
service, and we do here...
This catches errors like "ninja not found", missing programs etc. early,
instead of silently ignoring them and trying to boot a broken VM.
In install_config_files(), allow some distro specific files to be absent
(such as /etc/sysconfig/init).
All test/TEST* but TEST-02-CRYPTSETUP share the same check_result_qemu()
and test_cleanup(), so move them into test_functions and only override
them in TEST-02-CRYPTSETUP.
Also provide a common test_run() which by default assumes that both QEMU
and nspawn tests are run. Particular tests which don't support either
need to explicitly opt out by setting $TEST_NO_{QEMU,NSPAWN}. Do it this
way around to avoid accidentally forgetting to opt in, and to encourage
test authors to at least always support nspawn.
