Trying to copy the EFI setup from the original Ubuntu ISO (#2361)

kalxas · Jul 31, 2022 · c7f3202 · c7f3202
1 parent 4377353
commit c7f3202
Showing 1 changed file with 10 additions and 2 deletions.
diff --git a/bin/build_chroot.sh b/bin/build_chroot.sh
@@ -145,6 +145,14 @@ mkdir mnt
 sudo mount -o loop "$UBU_ISO" mnt
 echo "Lubuntu $ISO_RELEASE $ARCH image mounted."
 
+#Extract iso EFI and MBR partitions
+EFI=efi.partition
+MBR=mbr.partition
+dd if="$UBU_ISO" bs=1 count=446 of="$MBR"
+EFISKIP=$(/sbin/fdisk -l "$UBU_ISO" | fgrep '.iso2 ' | awk '{print $2}')
+EFISIZE=$(/sbin/fdisk -l "$UBU_ISO" | fgrep '.iso2 ' | awk '{print $4}')
+dd if="$UBU_ISO" bs=512 skip="$EFISKIP" count="$EFISIZE" of="$EFI"
+
 #Extract .iso contents into dir 'extract-cd' 
 mkdir "extract-cd"
 rsync --exclude=/casper/filesystem.squashfs -a mnt/ "extract-cd"
@@ -374,8 +382,8 @@ echo "======================================"
 if [ "$ARCH" = "amd64" ] ; then
    sudo mkisofs -D -r -V "$IMAGE_NAME" -cache-inodes -J -l -quiet -b \
       boot/grub/i386-pc/eltorito.img -c boot.catalog -no-emul-boot \
-      -boot-load-size 4 -boot-info-table \
-      -eltorito-alt-boot -e EFI/boot/grubx64.efi -no-emul-boot \
+      -boot-load-size 4 -boot-info-table -append_partition 2 0xEF "../$EFI" \
+      -eltorito-alt-boot -e '--interval:appended_partition_2:all::' -no-emul-boot \
       -o ../"$ISO_NAME.iso" .
    # sudo isohybrid -u ../"$ISO_NAME.iso"
 else