tests: turn check if manager cannot be intialized into macro

We need to check the same thing in multiple tests. Use a shared
macro to make it easier to update the list of errnos.

Change the errno code for "unitialized cgroup fs" for ENOMEDIUM.
Exec format error looks like something more serious.

This fixes test-execute invocation in mock.

1 files changed, 1 insertions, 1 deletions

diff --git a/src/cgls/cgls.c b/src/cgls/cgls.c
index e6277a9084..12537ae85b 100644
--- a/src/cgls/cgls.c
+++ b/src/cgls/cgls.c
@@ -131,7 +131,7 @@ static int get_cgroup_root(char **ret) {
 
         if (!arg_machine) {
                 r = cg_get_root_path(ret);
-                if (r == -ENOEXEC)
+                if (r == -ENOMEDIUM)
                         return log_error_errno(r, "Failed to get root control group path: No cgroup filesystem mounted on /sys/fs/cgroup");
                 else if (r < 0)
                         return log_error_errno(r, "Failed to get root control group path: %m");