From: Sebastien Bacher <seb128@ubuntu.com>
Date: Mon, 2 Apr 2018 10:52:47 -0400
Subject: Support polkit session agent running outside user session

commit a68f5dfd7662767b7b9822090b70bc5bd145c50c made
session applications that are running from a user bus
work with polkitd, by falling back to using the currently
active session.

This commit is similar, but for the polkit agent.  It allows,
a polkit agent to be run from a systemd --user service
that's not running directly in the users session.

Bug: https://bugs.freedesktop.org/show_bug.cgi?id=96977
Applied-upstream: 0.114, commit:00a663e3fb14d8023e7cb6a66d091872bf4f2851
---
 src/polkit/polkitunixsession-systemd.c | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/src/polkit/polkitunixsession-systemd.c b/src/polkit/polkitunixsession-systemd.c
index 8a8bf65..c34f36a 100644
--- a/src/polkit/polkitunixsession-systemd.c
+++ b/src/polkit/polkitunixsession-systemd.c
@@ -451,6 +451,7 @@ polkit_unix_session_initable_init (GInitable     *initable,
   PolkitUnixSession *session = POLKIT_UNIX_SESSION (initable);
   gboolean ret = FALSE;
   char *s;
+  uid_t uid;
 
   if (session->session_id != NULL)
     {
@@ -467,6 +468,19 @@ polkit_unix_session_initable_init (GInitable     *initable,
       goto out;
     }
 
+  /* Now do process -> uid -> graphical session (systemd version 213)*/
+  if (sd_pid_get_owner_uid (session->pid, &uid) < 0)
+    goto error;
+
+  if (sd_uid_get_display (uid, &s) >= 0)
+    {
+      session->session_id =  g_strdup (s);
+      free (s);
+      ret = TRUE;
+      goto out;
+    }
+
+error:
   g_set_error (error,
                POLKIT_ERROR,
                POLKIT_ERROR_FAILED,
