mkarchiso: add uefi-ia32.systemd-boot.esp and uefi-ia32.systemd-boot.eltorito boot modes

The systemd 254.2-1 package ships with IA32 systemd-boot, so it is
possible to use for booting on IA32 UEFI.

Perhaps they will be useful in the future.
At least for now, the baseline and releng profiles are not changed to
use them. When the issues and headaches caused with GRUB reach a
critical point, then we will switch.

1 files changed, 127 insertions, 27 deletions

diff --git a/archiso/mkarchiso b/archiso/mkarchiso
index 15534bf..a727a1a 100755
--- a/archiso/mkarchiso
+++ b/archiso/mkarchiso
@@ -793,11 +793,9 @@ _make_bootmode_uefi-x64.grub.eltorito() {
     _msg_info "Done!"
 }
 
-# Prepare systemd-boot for booting when written to a disk (isohybrid)
-_make_bootmode_uefi-x64.systemd-boot.esp() {
+_make_common_bootmode_systemd-boot() {
     local _file efiboot_imgsize
     local _available_ucodes=()
-    _msg_info "Setting up systemd-boot for UEFI booting..."
 
     for _file in "${ucodes[@]}"; do
         if [[ -e "${pacstrap_dir}/boot/${_file}" ]]; then
@@ -805,20 +803,41 @@ _make_bootmode_uefi-x64.systemd-boot.esp() {
         fi
     done
     # Calculate the required FAT image size in bytes
-    efiboot_files+=("${pacstrap_dir}/usr/lib/systemd/boot/efi/systemd-bootx64.efi"
-                    "${pacstrap_dir}/usr/share/edk2-shell/x64/Shell_Full.efi"
-                    "${profile}/efiboot/"
+    # shellcheck disable=SC2076
+    if [[ " ${bootmodes[*]} " =~ ' uefi-x64.systemd-boot.esp ' || " ${bootmodes[*]} " =~ ' uefi-x64.systemd-boot.eltorito ' ]]; then
+        efiboot_files+=("${pacstrap_dir}/usr/lib/systemd/boot/efi/systemd-bootx64.efi"
+                        "${pacstrap_dir}/usr/share/edk2-shell/x64/Shell_Full.efi")
+    fi
+    # shellcheck disable=SC2076
+    if [[ " ${bootmodes[*]} " =~ ' uefi-ia32.systemd-boot.esp ' || " ${bootmodes[*]} " =~ ' uefi-ia32.systemd-boot.eltorito ' ]]; then
+        efiboot_files+=("${pacstrap_dir}/usr/lib/systemd/boot/efi/systemd-bootia32.efi"
+                        "${pacstrap_dir}/usr/share/edk2-shell/ia32/Shell_Full.efi")
+    fi
+    efiboot_files+=("${profile}/efiboot/"
                     "${pacstrap_dir}/boot/vmlinuz-"*
                     "${pacstrap_dir}/boot/initramfs-"*".img"
                     "${_available_ucodes[@]}")
-    efiboot_imgsize="$(du -bcs -- "${efiboot_files[@]}" \
-        2>/dev/null | awk 'END { print $1 }')"
+    efiboot_imgsize="$(du -bcs -- "${efiboot_files[@]}" 2>/dev/null | awk 'END { print $1 }')"
     # Create a FAT image for the EFI system partition
     _make_efibootimg "$efiboot_imgsize"
+}
 
-    # Copy systemd-boot EFI binary to the default/fallback boot path
-    mcopy -i "${efibootimg}" \
-        "${pacstrap_dir}/usr/lib/systemd/boot/efi/systemd-bootx64.efi" ::/EFI/BOOT/BOOTx64.EFI
+_make_common_bootmode_systemd-boot_conf.isofs() {
+    local _conf
+
+    # Copy systemd-boot configuration files
+    install -d -m 0755 -- "${isofs_dir}/loader/entries"
+    install -m 0644 -- "${profile}/efiboot/loader/loader.conf" "${isofs_dir}/loader/"
+    for _conf in "${profile}/efiboot/loader/entries/"*".conf"; do
+        sed "s|%ARCHISO_LABEL%|${iso_label}|g;
+             s|%INSTALL_DIR%|${install_dir}|g;
+             s|%ARCH%|${arch}|g" \
+            "${_conf}" >"${isofs_dir}/loader/entries/${_conf##*/}"
+    done
+}
+
+_make_common_bootmode_systemd-boot_conf.esp() {
+    local _conf
 
     # Copy systemd-boot configuration files
     mmd -i "${efibootimg}" ::/loader ::/loader/entries
@@ -830,6 +849,20 @@ _make_bootmode_uefi-x64.systemd-boot.esp() {
              s|%ARCH%|${arch}|g" \
             "${_conf}" | mcopy -i "${efibootimg}" - "::/loader/entries/${_conf##*/}"
     done
+}
+
+# Prepare systemd-boot for booting when written to a disk (isohybrid)
+_make_bootmode_uefi-x64.systemd-boot.esp() {
+    _msg_info "Setting up systemd-boot for x64 UEFI booting..."
+
+    _run_once _make_common_bootmode_systemd-boot
+
+    # Copy systemd-boot EFI binary to the default/fallback boot path
+    mcopy -i "${efibootimg}" \
+        "${pacstrap_dir}/usr/lib/systemd/boot/efi/systemd-bootx64.efi" ::/EFI/BOOT/BOOTx64.EFI
+
+    # Copy systemd-boot configuration files
+    _run_once _make_common_bootmode_systemd-boot_conf.esp
 
     # shellx64.efi is picked up automatically when on /
     if [[ -e "${pacstrap_dir}/usr/share/edk2-shell/x64/Shell_Full.efi" ]]; then
@@ -839,9 +872,9 @@ _make_bootmode_uefi-x64.systemd-boot.esp() {
 
     # Copy kernel and initramfs to FAT image.
     # systemd-boot can only access files from the EFI system partition it was launched from.
-    _make_boot_on_fat
+    _run_once _make_boot_on_fat
 
-    _msg_info "Done! systemd-boot set up for UEFI booting successfully."
+    _msg_info "Done! systemd-boot set up for x64 UEFI booting successfully."
 }
 
 # Prepare systemd-boot for El Torito booting
@@ -861,14 +894,7 @@ _make_bootmode_uefi-x64.systemd-boot.eltorito() {
         "${isofs_dir}/EFI/BOOT/BOOTx64.EFI"
 
     # Copy systemd-boot configuration files
-    install -d -m 0755 -- "${isofs_dir}/loader/entries"
-    install -m 0644 -- "${profile}/efiboot/loader/loader.conf" "${isofs_dir}/loader/"
-    for _conf in "${profile}/efiboot/loader/entries/"*".conf"; do
-        sed "s|%ARCHISO_LABEL%|${iso_label}|g;
-             s|%INSTALL_DIR%|${install_dir}|g;
-             s|%ARCH%|${arch}|g" \
-            "${_conf}" >"${isofs_dir}/loader/entries/${_conf##*/}"
-    done
+    _run_once _make_common_bootmode_systemd-boot_conf.isofs
 
     # edk2-shell based UEFI shell
     # shellx64.efi is picked up automatically when on /
@@ -879,6 +905,58 @@ _make_bootmode_uefi-x64.systemd-boot.eltorito() {
     _msg_info "Done!"
 }
 
+_make_bootmode_uefi-ia32.systemd-boot.esp() {
+    _msg_info "Setting up systemd-boot for IA32 UEFI booting..."
+
+    _run_once _make_common_bootmode_systemd-boot
+
+    # Copy systemd-boot EFI binary to the default/fallback boot path
+    mcopy -i "${efibootimg}" \
+        "${pacstrap_dir}/usr/lib/systemd/boot/efi/systemd-bootia32.efi" ::/EFI/BOOT/BOOTIA32.EFI
+
+    # Copy systemd-boot configuration files
+    _run_once _make_common_bootmode_systemd-boot_conf.esp
+
+    # shellia32.efi is picked up automatically when on /
+    if [[ -e "${pacstrap_dir}/usr/share/edk2-shell/ia32/Shell_Full.efi" ]]; then
+        mcopy -i "${efibootimg}" \
+            "${pacstrap_dir}/usr/share/edk2-shell/ia32/Shell_Full.efi" ::/shellia32.efi
+    fi
+
+    # Copy kernel and initramfs to FAT image.
+    # systemd-boot can only access files from the EFI system partition it was launched from.
+    _run_once _make_boot_on_fat
+
+    _msg_info "Done! systemd-boot set up for IA32 UEFI booting successfully."
+}
+
+_make_bootmode_uefi-ia32.systemd-boot.eltorito() {
+    # El Torito UEFI boot requires an image containing the EFI system partition.
+    # uefi-ia32.systemd-boot.eltorito has the same requirements as uefi-ia32.systemd-boot.esp
+    _run_once _make_bootmode_uefi-ia32.systemd-boot.esp
+
+    # Additionally set up systemd-boot in ISO 9660. This allows creating a medium for the live environment by using
+    # manual partitioning and simply copying the ISO 9660 file system contents.
+    # This is not related to El Torito booting and no firmware uses these files.
+    _msg_info "Preparing an /EFI directory for the ISO 9660 file system..."
+    install -d -m 0755 -- "${isofs_dir}/EFI/BOOT"
+
+    # Copy systemd-boot EFI binary to the default/fallback boot path
+    install -m 0644 -- "${pacstrap_dir}/usr/lib/systemd/boot/efi/systemd-bootia32.efi" \
+        "${isofs_dir}/EFI/BOOT/BOOTIA32.EFI"
+
+    # Copy systemd-boot configuration files
+    _run_once _make_common_bootmode_systemd-boot_conf.isofs
+
+    # edk2-shell based UEFI shell
+    # shellia32.efi is picked up automatically when on /
+    if [[ -e "${pacstrap_dir}/usr/share/edk2-shell/ia32/Shell_Full.efi" ]]; then
+        install -m 0644 -- "${pacstrap_dir}/usr/share/edk2-shell/ia32/Shell_Full.efi" "${isofs_dir}/shellia32.efi"
+    fi
+
+    _msg_info "Done!"
+}
+
 _validate_requirements_bootmode_bios.syslinux.mbr() {
     # bios.syslinux.mbr requires bios.syslinux.eltorito
     # shellcheck disable=SC2076
@@ -922,12 +1000,7 @@ _validate_requirements_bootmode_bios.syslinux.eltorito() {
     _validate_requirements_bootmode_bios.syslinux.mbr
 }
 
-_validate_requirements_bootmode_uefi-x64.systemd-boot.esp() {
-    # shellcheck disable=SC2076
-    if [[ " ${bootmodes[*]} " =~ ' uefi-x64.grub.esp ' ]]; then
-        _msg_error "Validating '${bootmode}': cannot be used with bootmode uefi-x64.grub.esp!" 0
-    fi
-
+_validate_requirements_common_systemd-boot() {
     # Check if mkfs.fat is available
     if ! command -v mkfs.fat &>/dev/null; then
         (( validation_error=validation_error+1 ))
@@ -967,6 +1040,14 @@ _validate_requirements_bootmode_uefi-x64.systemd-boot.esp() {
     fi
 }
 
+_validate_requirements_bootmode_uefi-x64.systemd-boot.esp() {
+    # shellcheck disable=SC2076
+    if [[ " ${bootmodes[*]} " =~ ' uefi-x64.grub.esp ' ]]; then
+        _msg_error "Validating '${bootmode}': cannot be used with bootmode uefi-x64.grub.esp!" 0
+    fi
+    _validate_requirements_common_systemd-boot
+}
+
 _validate_requirements_bootmode_uefi-x64.systemd-boot.eltorito() {
     # shellcheck disable=SC2076
     if [[ " ${bootmodes[*]} " =~ ' uefi-x64.grub.eltorito ' ]]; then
@@ -977,6 +1058,25 @@ _validate_requirements_bootmode_uefi-x64.systemd-boot.eltorito() {
     _validate_requirements_bootmode_uefi-x64.systemd-boot.esp
 }
 
+_validate_requirements_bootmode_uefi-ia32.systemd-boot.esp() {
+    # shellcheck disable=SC2076
+    if [[ " ${bootmodes[*]} " =~ ' uefi-ia32.grub.esp ' ]]; then
+        _msg_error "Validating '${bootmode}': cannot be used with bootmode uefi-ia32.grub.esp!" 0
+    fi
+
+    _validate_requirements_common_systemd-boot
+}
+
+_validate_requirements_bootmode_uefi-ia32.systemd-boot.eltorito() {
+    # shellcheck disable=SC2076
+    if [[ " ${bootmodes[*]} " =~ ' uefi-ia32.grub.eltorito ' ]]; then
+        _msg_error "Validating '${bootmode}': cannot be used with bootmode uefi-ia32.grub.eltorito!" 0
+    fi
+
+    # uefi-ia32.systemd-boot.eltorito has the exact same requirements as uefi-ia32.systemd-boot.esp
+    _validate_requirements_bootmode_uefi-x64.systemd-boot.esp
+}
+
 _validate_requirements_bootmode_uefi-ia32.grub.esp() {
     # Check if GRUB is available
     if ! command -v grub-mkstandalone &>/dev/null; then