journalctl: improve hint about lack of access for --user-unit=...

When running journalctl --user-unit=foo as an unprivileged user we could get
the usual hint:
Hint: You are currently not seeing messages from the system and other users.
      Users in groups 'adm', 'systemd-journal', 'wheel' can see all messages.
      ...
But with --user-unit our filter is:
(((_UID=0 OR _UID=1000) AND OBJECT_SYSTEMD_USER_UNIT=foo.service) OR
 ((_UID=0 OR _UID=1000) AND COREDUMP_USER_UNIT=foo.service) OR
 (_UID=1000 AND USER_UNIT=foo.service) OR
 (_UID=1000 AND _SYSTEMD_USER_UNIT=foo.service))
so we would never see messages from other users.

We could still see messages from the system. In fact, on my machine the
only messages with OBJECT_SYSTEMD_USER_UNIT= are from the system:
journalctl  $(journalctl -F OBJECT_SYSTEMD_USER_UNIT|sed 's/.*/OBJECT_SYSTEMD_USER_UNIT=\0/')

Thus, a more correct hint is that we cannot see messages from the system.
Make it so.

Fixes #7887.

1 files changed, 1 insertions, 1 deletions

diff --git a/src/shared/journal-util.h b/src/shared/journal-util.h
index ef5e314d37..f973729a32 100644
--- a/src/shared/journal-util.h
+++ b/src/shared/journal-util.h
@@ -26,4 +26,4 @@
 
 bool journal_field_valid(const char *p, size_t l, bool allow_protected);
 
-int journal_access_check_and_warn(sd_journal *j, bool quiet);
+int journal_access_check_and_warn(sd_journal *j, bool quiet, bool want_other_users);