debian/patches: Add 0006_util-Blacklist-some-session-specific-variables.patch. Fix systemd-logind originated problems when unlocking screen saver. (Closes: #986100).

debian/patches/0006_util-Blacklist-some-session-specific-variables.patch

@@ -0,0 +1,73 @@
+From 29bd7ce251aa617d9f93c8ed95ee7ab49c8684ef Mon Sep 17 00:00:00 2001
+From: Mike Gabriel <mike.gabriel@das-netzwerkteam.de>
+Date: Mon, 17 May 2021 00:05:16 +0200
+Forwarded: https://github.com/mate-desktop/mate-session-manager/pull/282
+Subject: [PATCH] util: Blacklist some session-specific variables
+
+Things like XDG_SESSION_ID should not be uploaded to the environment.
+For example this is broken currently:
+
+  1. SSH to your machine
+  2. Log in to MATE Shell
+  3. Log out
+  4. Log in again
+  5. Lock the screen
+  6. Try to unlock
+
+You can't, and this is because the XDG_SESSION_ID from the first session
+(step 2) has leaked through to the second one (step 4), and so MATE
+Shell is listening to the `logind` `UnlockSession` signal for the wrong
+session. The SSH session established in step 1 serves to keep the
+`systemd --user` instance alive, so that the state is not torn down
+between logins.
+
+Original patch for GNOME by Iain Lane <iainl@gnome.org>.
+
+Patch ported over to MATE's session manager by Mike Gabriel
+<sunweaver@debian.org>.
+
+---
+ mate-session/gsm-util.c | 17 ++++++++++++++++-
+ 1 file changed, 16 insertions(+), 1 deletion(-)
+
+--- a/mate-session/gsm-util.c
++++ b/mate-session/gsm-util.c
+@@ -38,6 +38,13 @@
+ 
+ static gchar *_saved_session_dir = NULL;
+ 
++static const char * const variable_blacklist[] = {
++    "XDG_SEAT",
++    "XDG_SESSION_ID",
++    "XDG_VTNR",
++    NULL
++};
++
+ char *
+ gsm_util_find_desktop_file_for_app_name (const char *name,
+                                          char      **autostart_dirs)
+@@ -509,6 +516,9 @@
+                 const char *entry_name = entry_names[i];
+                 const char *entry_value = g_getenv (entry_name);
+ 
++                if (g_strv_contains (variable_blacklist, entry_name))
++                    continue;
++
+                 if (!g_utf8_validate (entry_name, -1, NULL))
+                     continue;
+ 
+@@ -576,8 +586,13 @@
+                 return FALSE;
+         }
+ 
++        entries = g_get_environ ();
++
++        for (; variable_blacklist[i] != NULL; i++)
++                entries = g_environ_unsetenv (entries, variable_blacklist[i]);
++
+         g_variant_builder_init (&builder, G_VARIANT_TYPE ("as"));
+-        for (entries = g_get_environ (); entries[i] != NULL; i++) {
++        for (i = 0; entries[i] != NULL; i++) {
+                 const char *entry = entries[i];
+ 
+                 if (!g_utf8_validate (entry, -1, NULL))

debian/patches/series

@@ -1 +1,2 @@
 0005_lock-session-before-user-switch.patch
+0006_util-Blacklist-some-session-specific-variables.patch