fixup! [4/4] Upgrade GitLab to Amazon Linux 2023 (#6160)

Author: achave11-ucsc

scripts/resolve_container_path.py

@@ -4,6 +4,9 @@
 import sys
 
 import docker
+from more_itertools import (
+    one,
+)
 
 from azul.logging import (
     configure_script_logging,
@@ -31,19 +34,22 @@ def resolve_container_path(container_path):
     try:
         with open(mountinfo) as f:
             log.info('Found %s', mountinfo)
-            # Entries in /proc/self/mountinfo look like this:
-            # 752 744 259:2 /docker/containers/dc61d93…ID…/hosts …
+            # Entries of interest in /proc/self/mountinfo look as follows:
+            # 752 744 259:2 /docker/containers/dc61d9…CONTAINER_ID…/<variable> …
             prefix = '/docker/containers'
-            contents = csv.reader(f, delimiter=' ')
-            for line in contents:
+            log.info('cgroup v2 prefix is %s', prefix)
+            containers = set()
+            for line in csv.reader(f, delimiter=' '):
                 path = line[3]
                 if path.startswith(prefix):
-                    log.info('Extracting the container ID from %s', path)
-                    parts = path.rsplit('/', maxsplit=2)[:-1]
-                    assert len(parts) == 2 and parts[0] == prefix, parts
-                    container_id = parts[1]
+                    log.info('Extracting container ID from %s', path)
+                    prfx, id, var = path.rsplit('/', maxsplit=2)
+                    assert var in ('hosts', 'hostname', 'resolv.conf'), var
+                    assert prfx == prefix, prfx
+                    containers.add(id)
+            container_id = one(containers)
     except FileNotFoundError:
-        log.info('Did not find %s', proc_cgroup)
+        log.info('Did not find %s', mountinfo)
     else:
         api = docker.client.from_env().api
         for mount in api.inspect_container(container_id)['Mounts']: