[Qemu-trivial] [PULL 05/22] tests/libqtest: Print error instead of aborting when env variable is missing

[Michael Tokarev]

From: Thomas Huth <address@hidden>

When you currently try to run a test directly from the command line
without setting the QTEST_QEMU_BINARY environment variable first,
you are presented with an unhelpful assertion message like this:

 ERROR:tests/libqtest.c:163:qtest_init_without_qmp_handshake:
 assertion failed: (qemu_binary != NULL)
 Aborted (core dumped)

Let's replace the assert() with a more user friendly error message
instead.

Reviewed-by: Markus Armbruster <address@hidden>
Signed-off-by: Thomas Huth <address@hidden>
Signed-off-by: Michael Tokarev <address@hidden>
---
 tests/libqtest.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/tests/libqtest.c b/tests/libqtest.c
index 84ecbd2bd8..4a5492a603 100644
--- a/tests/libqtest.c
+++ b/tests/libqtest.c
@@ -160,7 +160,10 @@ QTestState *qtest_init_without_qmp_handshake(const char 
*extra_args)
     const char *qemu_binary;
 
     qemu_binary = getenv("QTEST_QEMU_BINARY");
-    g_assert(qemu_binary != NULL);
+    if (!qemu_binary) {
+        fprintf(stderr, "Environment variable QTEST_QEMU_BINARY required\n");
+        exit(1);
+    }
 
     s = g_malloc(sizeof(*s));
 
-- 
2.11.0