From 1692d4a91d95fecd5642b0c92bc2c5b0dbcb4184 Mon Sep 17 00:00:00 2001
From: Neal Gompa <ngompa@fedoraproject.org>
Date: Fri, 29 Oct 2021 09:37:33 -0400
Subject: [PATCH] classic: Install the session for Wayland and ship override
 sessions

The regular GNOME session ships with three options:

* GNOME
* GNOME on Wayland (available when GDM starts in X11)
* GNOME on Xorg (available when GDM starts in Wayland)

The main GNOME session is set up so it works to match how GDM starts,
so GNOME is on Wayland if GDM is (or GNOME is on X11 if GDM is).

For GNOME Classic, we are missing this setup, so port this behavior
over from the GNOME session setup.

Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell-extensions/-/merge_requests/195>
---
 data/gnome-classic-wayland.desktop.in |  8 ++++++
 data/gnome-classic-xorg.desktop.in    |  8 ++++++
 data/meson.build                      | 40 +++++++++++++++++++++------
 meson.build                           |  5 ++++
 meson/session-post-install.py         | 20 ++++++++++++++
 5 files changed, 72 insertions(+), 9 deletions(-)
 create mode 100644 data/gnome-classic-wayland.desktop.in
 create mode 100644 data/gnome-classic-xorg.desktop.in
 create mode 100755 meson/session-post-install.py

diff --git a/data/gnome-classic-wayland.desktop.in b/data/gnome-classic-wayland.desktop.in
new file mode 100644
index 00000000..7287c689
--- /dev/null
+++ b/data/gnome-classic-wayland.desktop.in
@@ -0,0 +1,8 @@
+[Desktop Entry]
+Name=GNOME Classic on Wayland
+Comment=This session logs you into GNOME Classic
+Exec=env GNOME_SHELL_SESSION_MODE=classic gnome-session
+TryExec=gnome-session
+Type=Application
+DesktopNames=GNOME-Classic;GNOME;
+X-GDM-SessionRegisters=true
diff --git a/data/gnome-classic-xorg.desktop.in b/data/gnome-classic-xorg.desktop.in
new file mode 100644
index 00000000..5fb338a1
--- /dev/null
+++ b/data/gnome-classic-xorg.desktop.in
@@ -0,0 +1,8 @@
+[Desktop Entry]
+Name=GNOME Classic on Xorg
+Comment=This session logs you into GNOME Classic
+Exec=env GNOME_SHELL_SESSION_MODE=classic gnome-session
+TryExec=gnome-session
+Type=Application
+DesktopNames=GNOME-Classic;GNOME;
+X-GDM-SessionRegisters=true
diff --git a/data/meson.build b/data/meson.build
index 27f42872..47fe798e 100644
--- a/data/meson.build
+++ b/data/meson.build
@@ -1,12 +1,34 @@
-session_desktop = 'gnome-classic.desktop'
-i18n.merge_file('',
-  input:  session_desktop + '.in',
-  output: session_desktop,
-  po_dir: '../po',
-  install: true,
-  install_dir: xsessiondir,
-  type: 'desktop'
-)
+session_desktop_base = 'gnome-classic'
+
+session_desktops = [
+  session_desktop_base,
+  session_desktop_base + '-xorg',
+  session_desktop_base + '-wayland',
+]
+
+foreach name: session_desktops
+    session_desktop = name + '.desktop'
+    if name.endswith('-xorg')
+        session_instdir = xsessiondir
+    elif name.endswith('-wayland')
+        session_instdir = wlsessiondir
+    else
+        # FIXME: The same target can not be copied into two directories.
+        #        There is a workaround in meson/session-post-install.py until proper
+        #        solution arises:
+        #        https://github.com/mesonbuild/meson/issues/2416
+        session_instdir = xsessiondir
+        #session_instdir = [ xesssiondir, wlsessiondir ]
+    endif
+    i18n.merge_file('',
+      input:  session_desktop + '.in',
+      output: session_desktop,
+      po_dir: '../po',
+      install: true,
+      install_dir: session_instdir,
+      type: 'desktop'
+    )
+endforeach
 
 classic_uuids = []
 foreach e : classic_extensions
diff --git a/meson.build b/meson.build
index dda3ddac..ea8a859d 100644
--- a/meson.build
+++ b/meson.build
@@ -20,6 +20,7 @@ themedir = join_paths(shelldir, 'theme')
 schemadir = join_paths(datadir, 'glib-2.0', 'schemas')
 sessiondir = join_paths(datadir, 'gnome-session', 'sessions')
 xsessiondir = join_paths(datadir, 'xsessions')
+wlsessiondir = join_paths(datadir, 'wayland-sessions')
 
 ver_arr = meson.project_version().split('.')
 shell_version = ver_arr[0]
@@ -90,6 +91,10 @@ endforeach
 
 if classic_mode_enabled
   subdir('data')
+  meson.add_install_script(
+    'meson/session-post-install.py',
+    join_paths(get_option('prefix'), datadir)
+  )
 endif
 
 subdir('extensions')
diff --git a/meson/session-post-install.py b/meson/session-post-install.py
new file mode 100755
index 00000000..36abe5e4
--- /dev/null
+++ b/meson/session-post-install.py
@@ -0,0 +1,20 @@
+#!/usr/bin/env python3
+
+import os
+import shutil
+import sys
+
+if os.environ.get('DESTDIR'):
+  install_root = os.environ.get('DESTDIR') + os.path.abspath(sys.argv[1])
+else:
+  install_root = sys.argv[1]
+
+# FIXME: Meson is unable to copy a generated target file:
+#        https://groups.google.com/forum/#!topic/mesonbuild/3iIoYPrN4P0
+dst_dir = os.path.join(install_root, 'wayland-sessions')
+if not os.path.exists(dst_dir):
+  os.makedirs(dst_dir)
+
+src = os.path.join(install_root, 'xsessions', 'gnome-classic.desktop')
+dst = os.path.join(dst_dir, 'gnome-classic.desktop')
+shutil.copyfile(src, dst)
-- 
2.33.1