journalctl: give a nice hint about group membership based on ACLs of /var/log/journal

If we notice that we unprivileged and not in any of the groups which
have access to /var/log/journal, print a nice message about which groups
do.

This checks and prints all groups that are in the default ACL for
/var/log/journal, which is not necessarily correct for all journal
files, but pretty close.

1 files changed, 1 insertions, 0 deletions

diff --git a/src/shared/strv.h b/src/shared/strv.h
index 49058f8df8..910d15337f 100644
--- a/src/shared/strv.h
+++ b/src/shared/strv.h
@@ -41,6 +41,7 @@ char **strv_merge(char **a, char **b);
 char **strv_merge_concat(char **a, char **b, const char *suffix);
 char **strv_append(char **l, const char *s);
 int strv_extend(char ***l, const char *value);
+int strv_push(char ***l, char *value);
 
 char **strv_remove(char **l, const char *s);
 char **strv_remove_prefix(char **l, const char *s);