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testenv: podman.exec_cmd: better error if stopped

Testenv may try to run a comand in podman after the container was
stopped, if there is a bug in the shutdown logic. Give a meaningful
error in that case, instead of failing later on with a cryptic error in
subprocess.run() because None was passed inside cmd (for the container
name) instead of a string.

Change-Id: I29ebe200258a9a9ffb127ec8fa1260b7e2124c38
---
M _testenv/testenv/podman.py
1 file changed, 4 insertions(+), 0 deletions(-)

diff --git a/_testenv/testenv/podman.py b/_testenv/testenv/podman.py
index 6d801fa..53806a4 100644
--- a/_testenv/testenv/podman.py
+++ b/_testenv/testenv/podman.py
@@ -131,6 +131,10 @@
 
 
 def exec_cmd(cmd, podman_opts=[], cwd=None, env={}, *args, **kwargs):
+    if not container_name:
+        raise RuntimeError("Attempting to execute a command in podman, but the"
+                           f" container isn't running anymore: {cmd}")
+
     podman_opts = list(podman_opts)
     podman_opts += generate_env_podman(env)
     # Attach a fake tty (eclipse-titan won't print colored output otherwise)

