main/postmarketos-artwork: set plasma wallpaper (MR 5186)

Set the postmarketOS wallpaper as default for Plasma Mobile and Plasma
Desktop, so we can change it across all UIs with every postmarketOS
release.

It would be nice if we could just set the wallpaper with a simple config
file (reported https://bugs.kde.org/show_bug.cgi?id=487816). Until that
is possible, use a shell script as workaround.

Copy the contents dir and metadata.json file explicitly, instead of
copying the entire "meadow" directory. With this change we avoid copying
meadow.svg, which fixes two issues:
* This file doesn't have a stable name, when we switch to the next
  wallpaper and the user had selected it, the wallpaper will just be
  gone instead of automatically switching to the new wallpaper.
* It shows up as broken wallpaper in Plasma's wallpaper selection.

[ci:skip-build]: already built successfully in CI

main/postmarketos-artwork/APKBUILD

@@ -1,7 +1,7 @@
 # Maintainer: Oliver Smith <ollieparanoid@postmarketos.org>
 pkgname=postmarketos-artwork
 pkgver=5
-pkgrel=2
+pkgrel=3
 pkgdesc="Meta package for the postmarketOS artwork"
 url="https://postmarketos.org/"
 arch="noarch"
@@ -10,11 +10,14 @@ _hash="f28dd5fef287c970f50ca49bc44814ee1e3b229d"
 source="postmarketos-artwork-$_hash.tar.gz::https://gitlab.com/postmarketOS/artwork/-/archive/$_hash/artwork-$_hash.tar.gz
 	10_pmOS-wallpaper.gschema.override
 	postmarketos-gnome.xml
+	set-plasma-wallpaper.desktop
+	set-plasma-wallpaper.sh
 	"
 subpackages="
 	$pkgname-wallpapers
 	$pkgname-wallpapers-extra:wallpapers_extra
 	$pkgname-wallpapers-gnome:wallpapers_gnome
+	$pkgname-wallpapers-plasma:wallpapers_plasma
 	$pkgname-icons
 	$pkgname-sounds
 	"
@@ -32,7 +35,7 @@ package() {
 wallpapers() {
 	pkgdesc="Wallpapers for postmarketOS"
 
-	mkdir -p "$subpkgdir"/usr/share/wallpapers
+	mkdir -p "$subpkgdir"/usr/share/wallpapers/postmarketos
 
 	# To avoid complexity, we only package the most recent wallpaper.
 	# Checklist for changing the wallpaper:
@@ -43,8 +46,10 @@ wallpapers() {
 	#     - postmarketos.jpg symlink/conversion below
 	#     - postmarketos-gnome.xml
 	#     - 10_pmOS-wallpaper.gschema.override
-	cp -r "$builddir"/wallpapers/2024/meadow \
-		"$subpkgdir"/usr/share/wallpapers/postmarketos
+	for i in contents metadata.json; do
+		cp -r "$builddir"/wallpapers/2024/meadow/"$i" \
+			"$subpkgdir"/usr/share/wallpapers/postmarketos/"$i"
+	done
 
 	# /usr/share/wallpapers/postmarketos.jpg should always point to the
 	# current wallpaper so we don't break configs
@@ -82,6 +87,17 @@ wallpapers_gnome() {
 		-t "$subpkgdir"/usr/share/glib-2.0/schemas
 }
 
+wallpapers_plasma() {
+	pkgdesc="Wallpaper configuration for Plasma-based UIs"
+	install_if="postmarketos-artwork-wallpapers=$pkgver-r$pkgrel postmarketos-base-ui-plasma"
+
+	install -Dm755 "$srcdir"/set-plasma-wallpaper.sh \
+		-t "$subpkgdir"/usr/libexec/postmarketos
+
+	install -Dm644 "$srcdir"/set-plasma-wallpaper.desktop \
+		-t "$subpkgdir"/etc/skel/.config/autostart
+}
+
 icons() {
 	pkgdesc="Icons for postmarketOS"
 
@@ -107,4 +123,6 @@ sha512sums="
 cef2326a28dbd597f3d679329aaac17031bf1fdc60f634bc25cf20b23e62028961c5f228570df824615b21616a18ab2fd290a770cfd4f3ca1d929ac552a34ea8  postmarketos-artwork-f28dd5fef287c970f50ca49bc44814ee1e3b229d.tar.gz
 6464a9246d1c9cac5cd2f55345f1659e872377f941160132c897c8c08955bb61083fec6daa8993a34bffdcc900a29f7ae6438fe86a476242447ddccf4e937d06  10_pmOS-wallpaper.gschema.override
 0bcdfb41adb02b657ee0f9938d134d551fa8c3ef166e8a7895908d1dd355119143088641196505b3e2018896ae39a5392032de114aa602f4911b3aeadddd7b60  postmarketos-gnome.xml
+a2fe87907a0fc6eb2b18305c7f183ac57bae7223d9fdeb992c93947576480c6a2fdb073ea2746407e227531c84aaa0acd0c27abb7fb272bc58433b3a02c260f4  set-plasma-wallpaper.desktop
+770bf87c4629327b4c7b35ee42587cdcd6100103640cce1894be66d1346b7220df919371935f3288e00f99b652f223ad578f1e93c5d43556e7c4ddd50f87f739  set-plasma-wallpaper.sh
 "

main/postmarketos-artwork/set-plasma-wallpaper.desktop

@@ -0,0 +1,5 @@
+[Desktop Entry]
+Exec=/usr/libexec/postmarketos/set-plasma-wallpaper.sh
+Name=Set postmarketOS wallpaper for Plasma
+Terminal=False
+Type=Application

main/postmarketos-artwork/set-plasma-wallpaper.sh

@@ -0,0 +1,38 @@
+#!/bin/sh
+# Set the postmarketOS wallpaper in Plasma based UIs. Replace this hack when we
+# have a cleaner method: https://bugs.kde.org/show_bug.cgi?id=487816
+
+MARKER=~/.local/state/postmarketos/plasma-wallpaper-has-been-set
+WALLPAPER_PATH="/usr/share/wallpapers/postmarketos"
+
+# Only run this script in Plasma sessions. This variable is set in in both
+# Plasma Desktop and Plasma Mobile (unlike e.g. XDG_DESKTOP_SESSION).
+if [ -z "$KDE_FULL_SESSION" ]; then
+	exit 1
+fi
+
+# Only run this script once. If the user selects a different wallpaper
+# afterwards, it should not be changed.
+if [ -e "$MARKER" ]; then
+	exit 0
+fi
+
+echo "set-plasma-wallpaper: changing to: $WALLPAPER_PATH"
+
+# Unfortunately this fails if the D-Bus API isn't available yet. So we have to
+# try multiple times.
+for i in $(seq 1 30); do
+	sleep 1
+
+	if ! plasma-apply-wallpaperimage "$WALLPAPER_PATH"; then
+		continue
+	fi
+
+	mkdir -p "$(dirname "$MARKER")"
+	touch "$MARKER"
+	echo "set-plasma-wallpaper: success"
+	exit 0
+done
+
+echo "set-plasma-wallpaper: failed"
+exit 1