main/postmarketos-base-ui-gnome: add gnome-software stub for Duranium

Phosh allows uninstalling apps by tap-holding the icon, in the
background this spawns gnome-software with --uninstall ID.

Since system apps can't be uninstalled, but the user may still want to
hide them, introduce a stub which installs a copy of the apps desktop
file into the users local applications directory and marks it as Hidden,
effectively disabling the app.

Use Zenity to offer a prompt and explain how apps can be re-enabled
later (unfortunately there's no nice UI for this).

Additionally let's just plumb this in to flatpak and invoke flatpak
uninstall in the background, this provides a nicer interface than simply
doing nothing.

main/postmarketos-base-ui-gnome/APKBUILD

@@ -3,7 +3,7 @@
 maintainer="Stefan Hansson <newbyte@postmarketos.org>"
 pkgname=postmarketos-base-ui-gnome
 pkgver=11
-pkgrel=2
+pkgrel=3
 pkgdesc="Meta package for shared configuration for GNOME-based UIs"
 url="https://postmarketos.org"
 arch="noarch"
@@ -33,6 +33,8 @@ source="
 	00_postmarketos-base-ui-gnome.gschema.override
 	10_postmarketos-green-accent.gschema.override
 	50-duranium.conf
+	duranium-gnome-software-stub.sh
+	duranium-gnome-software-stub.desktop
 	"
 options="!check"
 subpackages="
@@ -98,10 +100,16 @@ openrc() {
 duranium() {
 	pkgdesc="$pkgdesc (Duranium)"
 	install_if="$pkgname=$pkgver-r$pkgrel postmarketos-duranium"
-	depends="gnome-app-provider-bazaar"
+	# Bash and zenity for the gnome-software stub
+	depends="gnome-app-provider-bazaar bash zenity"
 
 	install -Dm644 "$srcdir"/50-duranium.conf \
 		-t "$subpkgdir"/usr/lib/kernel-cmdline.d
+
+	install -Dm755 "$srcdir"/duranium-gnome-software-stub.sh \
+		"$subpkgdir"/usr/bin/gnome-software
+	install -Dm644 "$srcdir"/duranium-gnome-software-stub.desktop \
+		"$subpkgdir"/usr/share/applications/org.gnome.Software.desktop
 }
 
 gnome_software() {
@@ -126,4 +134,6 @@ sha512sums="
 39b5bb5e669756e2a308ab61b7901e76a9eff9e37c82d50bd9ff77800e72c19b580256f617a2ad0949c1746ab4e163e5ce009c134ab77f8a32f758b1b963862e  00_postmarketos-base-ui-gnome.gschema.override
 c255b0914043f09ef5cc56d50c26e9c8885af128abc3ed5494606bd304eefdeb761ed3bc2d5f86f7c3bfb16f7fc21ca1a6d954c8d21e73e7a5e7612a84a78b7c  10_postmarketos-green-accent.gschema.override
 d48775a344d221309fc4f6ab96ec9cd5e871290f940deb967369b8c65dcef570cc44f7c4e7980153390f9da2518fdcc4c0e0687e9e32a984f712bdb62ab65e3d  50-duranium.conf
+aeb9d58b4c944879dea6852c2d03a53d8fb83351b3181a7249681c4aa5508f9f7874459ae33c041320f14e16d9c05fe41803c5b718749bb233e30f5fc908fbab  duranium-gnome-software-stub.sh
+9c7a7f89bcc042e7f8aaab4b2572c371c4b729666d939280ce7db705d1ea300ebfa9fea9074af0c915a3e88d338969b3b133eca50f63b2f64a29cd1d8cf07ea9  duranium-gnome-software-stub.desktop
 "

main/postmarketos-base-ui-gnome/duranium-gnome-software-stub.desktop

@@ -0,0 +1,14 @@
+# Duranium: this is a stub so that the Phosh
+# app "uninstall" button works. We don't actually
+# ship GNOME Software and this desktop entry
+# has NoDisplay=true
+
+[Desktop Entry]
+Name=Software
+Comment=Add, remove or update software on this computer
+# Translators: Do NOT translate or transliterate this text (this is an icon file name)!
+Exec=gnome-software %U
+Terminal=false
+Type=Application
+Categories=GNOME;GTK;System;PackageManager;
+NoDisplay=true

main/postmarketos-base-ui-gnome/duranium-gnome-software-stub.sh

@@ -0,0 +1,85 @@
+#!/bin/bash
+#
+# This wrapper provides a mechanism for users to "uninstall"
+# system apps in Phosh/GNOME UIs. Since we can't actually
+# uninstall them we make a copy of the desktop file and add
+# the Hidden property to disable them.
+#
+
+prompt="Are you sure you want to disable this system app?
+
+It can be re-enabled by manually deleting the file
+
+"
+
+appid=""
+pargs=()
+
+while [ "$#" -gt 0 ]; do
+	case "$1" in
+		--uninstall)
+			# Phosh passes an app ID like 'system/flatpak/flatpak/org.gnome.Calculator/*'
+			appid="$(echo "$2" | rev | cut -d'/' -f2 | rev)"
+			newpath="$HOME"/.local/share/applications/"$appid".desktop
+			if grep -q "X-Duranium-Hidden=true" "$newpath" 2>/dev/null; then
+				echo "App $appid already hidden."
+				exit 0
+			fi
+			if [ -f /usr/share/applications/"$appid".desktop ]; then
+				# Make sure the user didn't click by mistake and explain how to
+				# re-enable the app
+				if ! zenity --title="Disable system app" --question --text="$prompt <tt>$newpath</tt>"; then
+					exit 1
+				fi
+
+				mkdir -p $HOME/.local/share/applications
+				cp /usr/share/applications/"$appid".desktop $HOME/.local/share/applications/
+				echo "Hidden=true" >> $newpath
+				echo "X-Duranium-Hidden=true" >> $newpath
+				echo "System app $appid has been hidden for user"
+				exit 0
+			fi
+			pargs+=("$1", "$2"); shift 2
+			;;
+		-h|--help)
+			echo "GNOME Software stub. This program can be used to hide"
+			echo "system apps or uninstall flatpak apps, intended to be used"
+			echo "by Phosh and other interfaces that use GNOME Software to"
+			echo "uninstall apps."
+			echo
+			echo "Usage:"
+			echo "gnome-software --uninstall APPID"
+			exit 1
+			;;
+		*) pargs+=("$1"); shift;;
+	esac
+done
+
+# If uninstalling a flatpak app do it directly
+if [ -z "$appid" ]; then
+	echo "GNOME Software is not installed, this is a compatibility wrapper"
+	echo "for uninstalling apps, it only supports the --uninstall flag."
+fi
+
+if ! flatpak list --user --app | grep "$appid"; then
+	zenity --title="Unknown application" --info --text="The app <tt>$appid</tt> can't be uninstalled."
+	exit 1
+fi
+
+# Get the actual name of the app
+app="$(flatpak info --user $appid | head -n2 | tail -1 | cut -d'-' -f1)"
+[[ -n "$app" ]] || app="$appid"
+
+# Ask the user to confirm
+if ! zenity --question --title="Remove $app?" --text="Are you sure you want to uninstall $app?"; then
+	exit 1;
+fi
+
+# Do the uninstall, logging to a temp file. If it fails show an error with the log
+log=$(mktemp)
+(
+	flatpak uninstall --user --app --noninteractive --assumeyes $appid \
+		|| zenity --title="Error uninstalling $app" --error --text="$(cat $log)"
+) > $log
+
+rm $log