[libvirt] [PATCH] tests: skip systemd activation test if FDs 3/4/5 are open

With systemd activation the passed in file descriptors are required to be numbered from STDERR_FILENO + 1 onwards. The unit tests thus require FDs 3, 4 and 5 to be available. This may not be the case in all environments in which the tests run. For example on RHEL7 it was seen that a library constructor (gcrypt probably) opens /dev/urandom and leaves the file handle open. This means FD 3 is not available and the activation tests fail. The best way to deal with this would be to create a standalone helper program for the tests, but that's much more work than just skipping the tests if we notice we have the problem. Signed-off-by: Daniel P. Berrangé <berrange(a)redhat.com&gt; --- Pushed as a CI build fix tests/virsystemdtest.c | 16 ++++++++++++---- 1 file changed, 12 insertions(+), 4 deletions(-) diff --git a/tests/virsystemdtest.c b/tests/virsystemdtest.c index 586c512fca..cd031914ab 100644 --- a/tests/virsystemdtest.c +++ b/tests/virsystemdtest.c @@ -23,6 +23,7 @@ #if defined(WITH_DBUS) && defined(__linux__) # include <dbus/dbus.h> +# include <fcntl.h> # define LIBVIRT_VIRSYSTEMDPRIV_H_ALLOW # include "virsystemdpriv.h" @@ -762,10 +763,17 @@ mymain(void) if (virTestRun("Test activation empty", testActivationEmpty, NULL) < 0) ret = -1; - if (virTestRun("Test activation names", testActivationFDNames, NULL) < 0) - ret = -1; - if (virTestRun("Test activation addrs", testActivationFDAddrs, NULL) < 0) - ret = -1; + + if (fcntl(STDERR_FILENO + 1, F_GETFL) == -1 && errno == EBADF && + fcntl(STDERR_FILENO + 2, F_GETFL) == -1 && errno == EBADF && + fcntl(STDERR_FILENO + 3, F_GETFL) == -1 && errno == EBADF) { + if (virTestRun("Test activation names", testActivationFDNames, NULL) < 0) + ret = -1; + if (virTestRun("Test activation addrs", testActivationFDAddrs, NULL) < 0) + ret = -1; + } else { + VIR_INFO("Skipping activation tests as FD 3/4/5 is open"); + } return ret == 0 ? EXIT_SUCCESS : EXIT_FAILURE; } -- 2.21.0