From 30b2c336d80aa08ffcc6ebba9540b15b07563a73 Mon Sep 17 00:00:00 2001
From: Lennart Poettering <lennart@poettering.net>
Date: Thu, 30 Jun 2011 04:31:49 +0200
Subject: [PATCH] pam: initialize XDG_RUNTIME_DIR

---
 src/pam-module.c | 47 ++++++++++++++++++++++++++++++++++++++++-------
 1 file changed, 40 insertions(+), 7 deletions(-)

diff --git a/src/pam-module.c b/src/pam-module.c
index 178c4694..dfeab97f 100644
--- a/src/pam-module.c
+++ b/src/pam-module.c
@@ -361,13 +361,6 @@ _public_ PAM_EXTERN int pam_sm_open_session(
         if (sd_booted() <= 0)
                 return PAM_SUCCESS;
 
-        /* Make sure we don't enter a loop by talking to
-         * systemd-logind when it is actually waiting for the
-         * background to finish start-up, */
-        pam_get_item(handle, PAM_SERVICE, (const void**) &service);
-        if (streq_ptr(service, "systemd-shared"))
-                return PAM_SUCCESS;
-
         if (parse_argv(handle,
                        argc, argv,
                        &controllers, &reset_controllers,
@@ -381,6 +374,46 @@ _public_ PAM_EXTERN int pam_sm_open_session(
         if (r != PAM_SUCCESS)
                 goto finish;
 
+        /* Make sure we don't enter a loop by talking to
+         * systemd-logind when it is actually waiting for the
+         * background to finish start-up. If the service is
+         * "systemd-shared" we simply set XDG_RUNTIME_DIR and
+         * leave. */
+
+        pam_get_item(handle, PAM_SERVICE, (const void**) &service);
+        if (streq_ptr(service, "systemd-shared")) {
+                char *p, *rt = NULL;
+
+                if (asprintf(&p, "/run/systemd/users/%lu", (unsigned long) pw->pw_uid) < 0) {
+                        r = PAM_BUF_ERR;
+                        goto finish;
+                }
+
+                r = parse_env_file(p, NEWLINE,
+                                   "RUNTIME", &rt,
+                                   NULL);
+                free(p);
+
+                if (r < 0 && r != -ENOENT) {
+                        r = PAM_SESSION_ERR;
+                        free(rt);
+                        goto finish;
+                }
+
+                if (rt)  {
+                        r = pam_misc_setenv(handle, "XDG_RUNTIME_DIR", rt, 0);
+                        free(rt);
+
+                        if (r != PAM_SUCCESS) {
+                                pam_syslog(handle, LOG_ERR, "Failed to set runtime dir.");
+                                goto finish;
+                        }
+                }
+
+                r = PAM_SUCCESS;
+                goto finish;
+        }
+
         if (kill_processes)
                 kill_processes = check_user_lists(handle, pw->pw_uid, kill_only_users, kill_exclude_users);
 
-- 
2.39.5