portablectl: fix detaching when an extension image has been deleted

src/portable/portablectl.c

@@ -108,7 +108,10 @@ static int attach_extensions_to_message(sd_bus_message *m, const char *method, c
         STRV_FOREACH(p, extensions) {
                 _cleanup_free_ char *resolved_extension_image = NULL;
 
-                r = determine_image(*p, false, &resolved_extension_image);
+                r = determine_image(
+                                *p,
+                                startswith_strv(method, STRV_MAKE("Get", "Detach")),
+                                &resolved_extension_image);
                 if (r < 0)
                         return r;
 

test/units/testsuite-29.sh

@@ -186,7 +186,11 @@ status="$(portablectl is-attached --extension /tmp/app10.raw /usr/share/minimal_
 
 portablectl inspect --force --cat --extension /tmp/app10.raw /usr/share/minimal_0.raw app0 | grep -q -F "Extension Release: /tmp/app10.raw"
 
-portablectl detach --force --now --runtime --extension /tmp/app10.raw /usr/share/minimal_0.raw app0
+# Ensure that we can detach even when an image has been deleted already (stop the unit manually as
+# portablectl won't find it)
+rm -f /tmp/app10.raw
+systemctl stop app0.service
+portablectl detach --force --runtime --extension /tmp/app10.raw /usr/share/minimal_0.raw app0
 
 # portablectl also accepts confexts
 portablectl "${ARGS[@]}" attach --now --runtime --extension /usr/share/app0.raw --extension /usr/share/conf0.raw /usr/share/minimal_0.raw app0