[gnome-shell/wip/fmuellner/per-desktop-overrides: 9/9] tools: Migrate changed overrides settings

[Florian Müllner <fmuellner src gnome org>]

commit d57dc94d9e999594cdcab432b9222b5c25330557
Author: Florian Müllner <fmuellner gnome org>
Date:   Wed Jul 18 19:27:29 2018 +0200

    tools: Migrate changed overrides settings
    
    While the new per-desktop overrides in GIO are easier to use for
    both developers and users, it is still inconvenient for everyone
    who changed the defaults using the old overrides hack to lose
    their settings. Address this by running a small script on startup
    that migrates existing settings.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=786496

 data/gnome-shell-overrides-migration.desktop.in |  5 ++++
 data/meson.build                                |  9 ++++++
 meson.build                                     |  3 ++
 tools/gnome-shell-overrides-migration.sh        | 38 +++++++++++++++++++++++++
 tools/meson.build                               |  4 +++
 5 files changed, 59 insertions(+)
---
diff --git a/data/gnome-shell-overrides-migration.desktop.in b/data/gnome-shell-overrides-migration.desktop.in
new file mode 100644
index 000000000..8ef86ac34
--- /dev/null
+++ b/data/gnome-shell-overrides-migration.desktop.in
@@ -0,0 +1,5 @@
+[Desktop Entry]
+Type=Application
+Name=GNOME settings overrides migration
+NoDisplay=True
+Exec=@libexecdir@/gnome-shell-overrides-migration.sh
diff --git a/data/meson.build b/data/meson.build
index de2e2053c..68e3ab81f 100644
--- a/data/meson.build
+++ b/data/meson.build
@@ -94,6 +94,15 @@ schema = configure_file(
 )
 install_data('00_org.gnome.shell.gschema.override', install_dir: schemadir)
 
+overrides_migration_conf = configuration_data()
+overrides_migration_conf.set('libexecdir', libexecdir)
+overrides_migration = configure_file(
+  input: 'gnome-shell-overrides-migration.desktop.in',
+  output: 'gnome-shell-overrides-migration.desktop',
+  configuration: overrides_migration_conf,
+  install_dir: autostartdir
+)
+
 if have_systemd
   unitconf = configuration_data()
   unitconf.set('bindir', bindir)
diff --git a/meson.build b/meson.build
index ad513a665..045684902 100644
--- a/meson.build
+++ b/meson.build
@@ -44,10 +44,12 @@ datadir = join_paths(prefix, get_option('datadir'))
 libdir = join_paths(prefix, get_option('libdir'))
 libexecdir = join_paths(prefix, get_option('libexecdir'))
 mandir = join_paths(prefix, get_option('mandir'))
+sysconfdir = join_paths(prefix, get_option('sysconfdir'))
 
 pkgdatadir = join_paths(datadir, meson.project_name())
 pkglibdir = join_paths(libdir, meson.project_name())
 
+autostartdir = join_paths(sysconfdir, 'xdg', 'autostart')
 convertdir = join_paths(datadir, 'GConf', 'gsettings')
 desktopdir = join_paths(datadir, 'applications')
 ifacedir = join_paths(datadir, 'dbus-1', 'interfaces')
@@ -203,6 +205,7 @@ subdir('src')
 subdir('po')
 subdir('data')
 subdir('tests')
+subdir('tools')
 
 if get_option('gtk_doc')
   subdir('docs/reference')
diff --git a/tools/gnome-shell-overrides-migration.sh b/tools/gnome-shell-overrides-migration.sh
new file mode 100755
index 000000000..a1b4cb633
--- /dev/null
+++ b/tools/gnome-shell-overrides-migration.sh
@@ -0,0 +1,38 @@
+#!/bin/sh
+
+PKG_DATA_DIR=${XDG_DATA_HOME:-$HOME/.local/share}/gnome-shell
+
+MIGRATION_GUARD=$PKG_DATA_DIR/gnome-overrides-migrated
+OVERRIDE_SCHEMA=
+
+if [ -f $MIGRATION_GUARD ]; then
+  exit # already migrated
+fi
+
+# Find the right session
+if echo $XDG_CURRENT_DESKTOP | grep -q -v GNOME; then
+  exit # not a GNOME session
+fi
+
+if echo $XDG_CURRENT_DESKTOP | grep -q Classic; then
+  OVERRIDE_SCHEMA=org.gnome.shell.extensions.classic-overrides
+else
+  OVERRIDE_SCHEMA=org.gnome.shell.overrides
+fi
+
+mkdir -p $PKG_DATA_DIR
+
+for k in `gsettings list-keys $OVERRIDE_SCHEMA`
+do
+  if [ $k = button-layout ]; then
+    orig_schema=org.gnome.desktop.wm.preferences
+  else
+    orig_schema=org.gnome.mutter
+  fi
+
+  oldValue=`gsettings get $OVERRIDE_SCHEMA $k`
+  curValue=`gsettings get $orig_schema $k`
+  if [ $oldValue != $curValue ]; then
+    gsettings set $orig_schema $k $oldValue
+  fi
+done && touch $MIGRATION_GUARD
diff --git a/tools/meson.build b/tools/meson.build
new file mode 100644
index 000000000..d8e217cc4
--- /dev/null
+++ b/tools/meson.build
@@ -0,0 +1,4 @@
+install_data('gnome-shell-overrides-migration.sh',
+  install_dir: libexecdir,
+  install_mode: 'rwxr-xr-x'
+)