In containerized AppImage build use Clang and allow thin/fat LTO for smaller and more optimized AppImages

AppImage-build-debian.sh

@@ -1,28 +1,55 @@
 #! /bin/bash
 set -e
 
+# Parse options
+for i in "$@"
+do
+case $i in
+    -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."
+    ;;
+    -k|--keep-rootfs)
+        BUILD_KEEP_ROOTFS=1
+        echo "-> Not deleting rootfs after successful build."
+    ;;
+    *)
+        echo "Usage: $0 [--thin-lto/-o] [--fat-lto/-O] [--keep-rootfs/-k]"
+        exit 1
+    ;;
+esac
+done
+
 # Get torzu source dir
 TORZU_SOURCE_DIR="$(realpath "$(dirname "${BASH_SOURCE[0]}")")"
-echo "Source dir is $TORZU_SOURCE_DIR"
+echo "-> Source dir is $TORZU_SOURCE_DIR"
 rm -rf "$TORZU_SOURCE_DIR/AppImageBuilder/build"
 
 # Generate debian rootfs
 cd /tmp
 echo "Cleaning up before build..."
-rm -rf torzu-debian-appimage-rootfs rootfs-torzu-appimage-build
-debootstrap stable rootfs-torzu-appimage-build http://deb.debian.org/debian/
+rm -rf torzu-debian-appimage-rootfs
+[ -d rootfs-torzu-appimage-build ] ||
+    debootstrap stable rootfs-torzu-appimage-build http://deb.debian.org/debian/
 bwrap --bind rootfs-torzu-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 "$TORZU_SOURCE_DIR" /tmp/torzu-src \
-        --chdir / \
-        --tmpfs /home \
-        --setenv HOME /home \
-        --bind /tmp /tmp/hosttmp \
-        /tmp/torzu-src/AppImage-build-debian-inner.sh
+      --unshare-pid \
+      --dev-bind /dev /dev --proc /proc --tmpfs /tmp --ro-bind /sys /sys --dev-bind /run /run \
+      --tmpfs /var/tmp \
+      --chmod 1777 /tmp \
+      --ro-bind /etc/resolv.conf /etc/resolv.conf \
+      --ro-bind "$TORZU_SOURCE_DIR" /tmp/torzu-src-ro \
+      --chdir / \
+      --tmpfs /home \
+      --setenv HOME /home \
+      --bind /tmp /tmp/hosttmp \
+        /tmp/torzu-src-ro/AppImage-build-debian-inner.sh
 appimagetool torzu-debian-appimage-rootfs torzu.AppImage
 echo "AppImage generated at /tmp/torzu.AppImage! Cleaning up..."
-exec rm -rf torzu-debian-appimage-rootfs rootfs-torzu-appimage-build
+rm -rf torzu-debian-appimage-rootfs
+if [ ! "$BUILD_KEEP_ROOTFS" = 1 ]; then
+        rm -rf rootfs-torzu-appimage-build
+fi