feat: Added Torzu's AppImageBuilder

Added support for building AppImages using Torzu's AppImageBuilder.

Signed-off-by: Boss.sfc <boss.sfc@citron-emu.org>

AppImage-build-debian.sh

@@ -0,0 +1,73 @@
+#! /bin/bash
+set -e
+
+# Parse options
+for i in "$@"
+do
+case $i in
+    -l|--clang)
+        export BUILD_USE_CLANG=1
+        echo "-> Using Clang for compilation."
+    ;;
+    -o|--thin-lto)
+        export BUILD_USE_THIN_LTO=1
+        echo "-> Thin link time optimization enabled."
+    ;;
+    -O|--fat-lto)
+        export BUILD_USE_FAT_LTO=1
+        echo "-> Fat link time optimization enabled."
+    ;;
+    -p|--use-cpm)
+        export BUILD_USE_CPM=1
+        echo "-> Using CPM to download most dependencies."
+    ;;
+    -k|--keep-rootfs)
+        BUILD_KEEP_ROOTFS=1
+        echo "-> Not deleting rootfs after successful build."
+    ;;
+    *)
+        echo "Usage: $0 [--clang/-l] [--thin-lto/-o] [--fat-lto/-O] [--use-cpm/-p] [--keep-rootfs/-k]"
+        exit 1
+    ;;
+esac
+done
+
+# Make sure options are valid
+if [ "$BUILD_USE_THIN_LTO" = 1 ] && [ "$BUILD_USE_CLANG" != 1 ]; then
+    echo "Thin LTO can't be used without Clang!"
+    exit 2
+fi
+if [ "$BUILD_USE_THIN_LTO" = 1 ] && [ "$BUILD_USE_FAT_LTO" = 1 ]; then
+    echo "Only either thin or fat LTO can be used!"
+    exit 2
+fi
+
+# Get citron source dir
+citron_SOURCE_DIR="$(realpath "$(dirname "${BASH_SOURCE[0]}")")"
+echo "-> Source dir is $citron_SOURCE_DIR"
+rm -rf "$citron_SOURCE_DIR/AppImageBuilder/build"
+
+# Generate debian rootfs
+cd /tmp
+echo "Cleaning up before build..."
+rm -rf citron-debian-appimage-rootfs
+[ -d rootfs-citron-appimage-build ] ||
+    debootstrap stable rootfs-citron-appimage-build http://deb.debian.org/debian/
+bwrap --bind rootfs-citron-appimage-build / \
+      --unshare-pid \
+      --dev-bind /dev /dev --proc /proc --tmpfs /tmp --ro-bind /sys /sys --dev-bind /run /run \
+      --tmpfs /var/tmp \
+      --chmod 1777 /tmp \
+      --ro-bind /etc/resolv.conf /etc/resolv.conf \
+      --ro-bind "$citron_SOURCE_DIR" /tmp/citron-src-ro \
+      --chdir / \
+      --tmpfs /home \
+      --setenv HOME /home \
+      --bind /tmp /tmp/hosttmp \
+        /tmp/citron-src-ro/AppImage-build-debian-inner.sh
+appimagetool citron-debian-appimage-rootfs citron.AppImage
+echo "AppImage generated at /tmp/citron.AppImage! Cleaning up..."
+rm -rf citron-debian-appimage-rootfs
+if [ ! "$BUILD_KEEP_ROOTFS" = 1 ]; then
+        rm -rf rootfs-citron-appimage-build
+fi