Improve support for 32-bit EFI firmware in ISOs and installer

mklive:
- include support for booting both 32- and 64-bit UEFI firmware with
  32- and 64-bit images.
- require grub packages for both firmware bitness types
  (build-x86-images)

Installer:
- include support for installing both 32- and 64-bit UEFI grub loaders
- detect UEFI platform (firmware) bitness at install time

Closes: #102 [via git-merge-pr]

build-x86-images.sh.in

@@ -25,10 +25,7 @@ readonly KDE_IMG=void-live-${ARCH}-${DATE}-kde.iso
 readonly LXDE_IMG=void-live-${ARCH}-${DATE}-lxde.iso
 readonly LXQT_IMG=void-live-${ARCH}-${DATE}-lxqt.iso
 
-case "$ARCH" in
-	i686*) GRUB="grub";;
-	x86_64*) GRUB="grub-x86_64-efi";;
-esac
+readonly GRUB="grub-i386-efi grub-x86_64-efi"
 
 readonly BASE_PKGS="dialog cryptsetup lvm2 mdadm $GRUB"
 readonly X_PKGS="$BASE_PKGS xorg-minimal xorg-input-drivers xorg-video-drivers setxkbmap xauth font-misc-misc terminus-font dejavu-fonts-ttf alsa-plugins-pulseaudio"

installer.sh.in

@@ -60,6 +60,12 @@ fi
 # Detect if this is an EFI system.
 if [ -e /sys/firmware/efi/systab ]; then
     EFI_SYSTEM=1
+    EFI_FW_BITS=$(cat /sys/firmware/efi/fw_platform_size)
+    if [ $EFI_FW_BITS -eq 32 ]; then
+        EFI_TARGET=i386-efi
+    else
+        EFI_TARGET=x86_64-efi
+    fi
 fi
 
 # dialog colors
@@ -768,7 +774,7 @@ set_bootloader() {
 
     # Check if it's an EFI system via efivars module.
     if [ -n "$EFI_SYSTEM" ]; then
-        grub_args="--target=x86_64-efi --efi-directory=/boot/efi --bootloader-id=void_grub --recheck"
+        grub_args="--target=$EFI_TARGET --efi-directory=/boot/efi --bootloader-id=void_grub --recheck"
     fi
     echo "Running grub-install $grub_args $dev..." >$LOG
     chroot $TARGETDIR grub-install $grub_args $dev >$LOG 2>&1
@@ -1137,7 +1143,11 @@ install_packages() {
     local _grub= _syspkg=
 
     if [ -n "$EFI_SYSTEM" ]; then
-        _grub="grub-x86_64-efi"
+        if [ $EFI_FW_BITS -eq 32 ]; then
+            _grub="grub-i386-efi"
+        else
+            _grub="grub-x86_64-efi"
+        fi
     else
         _grub="grub"
     fi

mklive.sh.in

@@ -210,7 +210,7 @@ generate_grub_efi_boot() {
     modprobe -q loop || :
 
     # Create EFI vfat image.
-    truncate -s 16M $GRUB_DIR/efiboot.img >/dev/null 2>&1
+    truncate -s 32M $GRUB_DIR/efiboot.img >/dev/null 2>&1
     mkfs.vfat -F12 -S 512 -n "grub_uefi" "$GRUB_DIR/efiboot.img" >/dev/null 2>&1
 
     GRUB_EFI_TMPDIR="$(mktemp --tmpdir=$HOME -d)"
@@ -218,33 +218,29 @@ generate_grub_efi_boot() {
     mount -o rw,flush -t vfat "${LOOP_DEVICE}" "${GRUB_EFI_TMPDIR}" >/dev/null 2>&1
 
     cp -a $IMAGEDIR/boot $VOIDHOSTDIR
-    if [ $BASE_ARCH = "i686" ]; then
-	xbps-uchroot $VOIDHOSTDIR grub-mkstandalone -- \
-		     --directory="/usr/lib/grub/i386-efi" \
-		     --format="i386-efi" \
-		     --output="/tmp/bootia32.efi" \
-		     "boot/grub/grub.cfg"
-	if [ $? -ne 0 ]; then
-            umount "$GRUB_EFI_TMPDIR"
-            losetup --detach "${LOOP_DEVICE}"
-            die "Failed to generate EFI loader"
-	fi
-	mkdir -p ${GRUB_EFI_TMPDIR}/EFI/BOOT
-	cp -f $VOIDHOSTDIR/tmp/bootia32.efi ${GRUB_EFI_TMPDIR}/EFI/BOOT/BOOTIA32.EFI
-    else
-	xbps-uchroot $VOIDHOSTDIR grub-mkstandalone -- \
-		     --directory="/usr/lib/grub/x86_64-efi" \
-		     --format="x86_64-efi" \
-		     --output="/tmp/bootx64.efi" \
-		     "boot/grub/grub.cfg"
-	if [ $? -ne 0 ]; then
-            umount "$GRUB_EFI_TMPDIR"
-            losetup --detach "${LOOP_DEVICE}"
-            die "Failed to generate EFI loader"
-	fi
-	mkdir -p ${GRUB_EFI_TMPDIR}/EFI/BOOT
-	cp -f $VOIDHOSTDIR/tmp/bootx64.efi ${GRUB_EFI_TMPDIR}/EFI/BOOT/BOOTX64.EFI
+    xbps-uchroot $VOIDHOSTDIR grub-mkstandalone -- \
+		 --directory="/usr/lib/grub/i386-efi" \
+		 --format="i386-efi" \
+		 --output="/tmp/bootia32.efi" \
+		 "boot/grub/grub.cfg"
+    if [ $? -ne 0 ]; then
+        umount "$GRUB_EFI_TMPDIR"
+        losetup --detach "${LOOP_DEVICE}"
+        die "Failed to generate EFI loader"
+    fi
+    mkdir -p ${GRUB_EFI_TMPDIR}/EFI/BOOT
+    cp -f $VOIDHOSTDIR/tmp/bootia32.efi ${GRUB_EFI_TMPDIR}/EFI/BOOT/BOOTIA32.EFI
+    xbps-uchroot $VOIDHOSTDIR grub-mkstandalone -- \
+		 --directory="/usr/lib/grub/x86_64-efi" \
+		 --format="x86_64-efi" \
+		 --output="/tmp/bootx64.efi" \
+		 "boot/grub/grub.cfg"
+    if [ $? -ne 0 ]; then
+        umount "$GRUB_EFI_TMPDIR"
+        losetup --detach "${LOOP_DEVICE}"
+        die "Failed to generate EFI loader"
     fi
+    cp -f $VOIDHOSTDIR/tmp/bootx64.efi ${GRUB_EFI_TMPDIR}/EFI/BOOT/BOOTX64.EFI
     umount "$GRUB_EFI_TMPDIR"
     losetup --detach "${LOOP_DEVICE}"
     rm -rf $GRUB_EFI_TMPDIR