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Support for 22.04
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* Changed the default ubuntu release to 22.04 (jammy)
* Added option --focal for 20.04 (focal)
* Implemented extracting boot partitions from existing cd image
* Changed xorriso call for image creation to conform to 22.04 layout

Signed-off-by: Nis Wechselberg <[email protected]>
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@eNBeWe
eNBeWe committed May 28, 2022
1 parent 2286503 commit 16239cc
Showing 1 changed file with 81 additions and 17 deletions.
98 changes: 81 additions & 17 deletions ubuntu-autoinstall-generator.sh
100644 → 100755
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Original file line number Diff line number Diff line change
Expand Up @@ -27,9 +27,10 @@ function die() {

usage() {
cat <<EOF
Usage: $(basename "${BASH_SOURCE[0]}") [-h] [-v] [-a] [-e] [-u user-data-file] [-m meta-data-file] [-k] [-c] [-r] [-s source-iso-file] [-d destination-iso-file]
Usage: $(basename "${BASH_SOURCE[0]}") [-h] [-v] [-a] [-e] [-u user-data-file] [-m meta-data-file] [-k] [--focal] [-c] [-r] [-s source-iso-file] [-d destination-iso-file]
💁 This script will create fully-automated Ubuntu 20.04 Focal Fossa installation media.
💁 This script will create fully-automated Ubuntu Server installation media.
By default, Ubuntu 22.04 images are created, but Ubuntu 20.04 is available as well.
Available options:
Expand All @@ -49,9 +50,10 @@ Available options:
downloaded and saved in ${script_dir}. The Ubuntu signing key will be downloaded and
saved in a new keyring in ${script_dir}
-c, --no-md5 Disable MD5 checksum on boot
--focal Create installation media for Ubuntu 20.04 Focal Fossa
-r, --use-release-iso Use the current release ISO instead of the daily ISO. The file will be used if it already
exists.
-s, --source Source ISO file. By default the latest daily ISO for Ubuntu 20.04 will be downloaded
-s, --source Source ISO file. By default the latest daily ISO will be downloaded
and saved as ${script_dir}/ubuntu-original-$today.iso
That file will be used by default if it already exists.
-d, --destination Destination ISO file. By default ${script_dir}/ubuntu-autoinstall-$today.iso will be
Expand All @@ -64,12 +66,13 @@ function parse_params() {
# default values of variables set from params
user_data_file=''
meta_data_file=''
download_url="https://cdimage.ubuntu.com/ubuntu-server/focal/daily-live/current"
download_iso="focal-live-server-amd64.iso"
original_iso="ubuntu-original-$today.iso"
focal=0
download_url="https://cdimage.ubuntu.com/ubuntu-server/jammy/daily-live/current"
download_iso="jammy-live-server-amd64.iso"
original_iso="ubuntu-jammy-original-$today.iso"
source_iso="${script_dir}/${original_iso}"
destination_iso="${script_dir}/ubuntu-autoinstall-$today.iso"
sha_suffix="${today}"
destination_iso="${script_dir}/ubuntu-jammy-autoinstall-$today.iso"
sha_suffix="-jammy-${today}"
gpg_verify=1
all_in_one=0
use_hwe_kernel=0
Expand All @@ -80,6 +83,7 @@ function parse_params() {
case "${1-}" in
-h | --help) usage ;;
-v | --verbose) set -x ;;
--focal) focal=1 ;;
-a | --all-in-one) all_in_one=1 ;;
-e | --use-hwe-kernel) use_hwe_kernel=1 ;;
-c | --no-md5) md5_checksum=0 ;;
Expand Down Expand Up @@ -120,10 +124,25 @@ function parse_params() {
[[ ! -f "${source_iso}" ]] && die "💥 Source ISO file could not be found."
fi

if [ ${focal} -eq 1 ]; then
download_url="https://cdimage.ubuntu.com/ubuntu-server/focal/daily-live/current"
download_iso="focal-live-server-amd64.iso"
original_iso="ubuntu-focal-original-$today.iso"
source_iso="${script_dir}/${original_iso}"
destination_iso="${script_dir}/ubuntu-focal-autoinstall-$today.iso"
sha_suffix="-focal-${today}"

fi

if [ "${use_release_iso}" -eq 1 ]; then
download_url="https://releases.ubuntu.com/focal"
log "🔎 Checking for current release..."
download_iso=$(curl -sSL "${download_url}" | grep -oP 'ubuntu-20\.04\.\d*-live-server-amd64\.iso' | head -n 1)
if [ ${focal} -eq 1 ]; then
download_url="https://releases.ubuntu.com/focal"
download_iso=$(curl -sSL "${download_url}" | grep -oP 'ubuntu-20\.04\.\d*-live-server-amd64\.iso' | head -n 1)
else
download_url="https://releases.ubuntu.com/jammy"
download_iso=$(curl -sSL "${download_url}" | grep -oP 'ubuntu-22\.04(\.\d*)?-live-server-amd64\.iso' | head -n 1)
fi
original_iso="${download_iso}"
source_iso="${script_dir}/${download_iso}"
current_release=$(echo "${download_iso}" | cut -f2 -d-)
Expand Down Expand Up @@ -154,11 +173,15 @@ log "🔎 Checking for required utilities..."
[[ ! -x "$(command -v sed)" ]] && die "💥 sed is not installed. On Ubuntu, install the 'sed' package."
[[ ! -x "$(command -v curl)" ]] && die "💥 curl is not installed. On Ubuntu, install the 'curl' package."
[[ ! -x "$(command -v gpg)" ]] && die "💥 gpg is not installed. On Ubuntu, install the 'gpg' package."
[[ ! -f "/usr/lib/ISOLINUX/isohdpfx.bin" ]] && die "💥 isolinux is not installed. On Ubuntu, install the 'isolinux' package."
if [ ${focal} -eq 1 ]; then
[[ ! -f "/usr/lib/ISOLINUX/isohdpfx.bin" ]] && die "💥 isolinux is not installed. On Ubuntu, install the 'isolinux' package."
else
[[ ! -x "$(command -v fdisk)" ]] && die "💥 fdisk is not installed. On Ubuntu, install the 'fdisk' package."
fi
log "👍 All required utilities are installed."

if [ ! -f "${source_iso}" ]; then
log "🌎 Downloading ISO image for Ubuntu 20.04 Focal Fossa..."
log "🌎 Downloading ISO image ..."
curl -NsSL "${download_url}/${download_iso}" -o "${source_iso}"
log "👍 Downloaded and saved to ${source_iso}"
else
Expand Down Expand Up @@ -213,11 +236,22 @@ chmod -R u+w "$tmpdir"
rm -rf "$tmpdir/"'[BOOT]'
log "👍 Extracted to $tmpdir"

if [ ${focal} -eq 0 ]; then
log "🔧 Extracting EFI images from image..."
efi_start=$(fdisk -o Start,Type -l "${source_iso}" | grep -oP '\d+(?=\s+EFI-System)')
efi_length=$(fdisk -o Sectors,Type -l "${source_iso}" | grep -oP '\d+(?=\s+EFI-System)')
dd if=${source_iso} bs=512 skip=${efi_start} count=${efi_length} of=${source_iso}-efi.img
dd if=${source_iso} bs=1 count=432 of=${source_iso}-hybrid.img
log "👍 Extracted EFI images"
fi

if [ ${use_hwe_kernel} -eq 1 ]; then
if grep -q "hwe-vmlinuz" "$tmpdir/boot/grub/grub.cfg"; then
log "☑️ Destination ISO will use HWE kernel."
sed -i -e 's|/casper/vmlinuz|/casper/hwe-vmlinuz|g' "$tmpdir/isolinux/txt.cfg"
sed -i -e 's|/casper/initrd|/casper/hwe-initrd|g' "$tmpdir/isolinux/txt.cfg"
if [ ${focal} -eq 1 ]; then
sed -i -e 's|/casper/vmlinuz|/casper/hwe-vmlinuz|g' "$tmpdir/isolinux/txt.cfg"
sed -i -e 's|/casper/initrd|/casper/hwe-initrd|g' "$tmpdir/isolinux/txt.cfg"
fi
sed -i -e 's|/casper/vmlinuz|/casper/hwe-vmlinuz|g' "$tmpdir/boot/grub/grub.cfg"
sed -i -e 's|/casper/initrd|/casper/hwe-initrd|g' "$tmpdir/boot/grub/grub.cfg"
sed -i -e 's|/casper/vmlinuz|/casper/hwe-vmlinuz|g' "$tmpdir/boot/grub/loopback.cfg"
Expand All @@ -228,7 +262,9 @@ if [ ${use_hwe_kernel} -eq 1 ]; then
fi

log "🧩 Adding autoinstall parameter to kernel command line..."
sed -i -e 's/---/ autoinstall ---/g' "$tmpdir/isolinux/txt.cfg"
if [ ${focal} -eq 1 ]; then
sed -i -e 's/---/ autoinstall ---/g' "$tmpdir/isolinux/txt.cfg"
fi
sed -i -e 's/---/ autoinstall ---/g' "$tmpdir/boot/grub/grub.cfg"
sed -i -e 's/---/ autoinstall ---/g' "$tmpdir/boot/grub/loopback.cfg"
log "👍 Added parameter to UEFI and BIOS kernel command lines."
Expand All @@ -242,7 +278,9 @@ if [ ${all_in_one} -eq 1 ]; then
else
touch "$tmpdir/nocloud/meta-data"
fi
sed -i -e 's,---, ds=nocloud;s=/cdrom/nocloud/ ---,g' "$tmpdir/isolinux/txt.cfg"
if [ ${focal} -eq 1 ]; then
sed -i -e 's,---, ds=nocloud;s=/cdrom/nocloud/ ---,g' "$tmpdir/isolinux/txt.cfg"
fi
sed -i -e 's,---, ds=nocloud\\\;s=/cdrom/nocloud/ ---,g' "$tmpdir/boot/grub/grub.cfg"
sed -i -e 's,---, ds=nocloud\\\;s=/cdrom/nocloud/ ---,g' "$tmpdir/boot/grub/loopback.cfg"
log "👍 Added data and configured kernel command line."
Expand All @@ -263,7 +301,33 @@ fi

log "📦 Repackaging extracted files into an ISO image..."
cd "$tmpdir"
xorriso -as mkisofs -r -V "ubuntu-autoinstall-$today" -J -b isolinux/isolinux.bin -c isolinux/boot.cat -no-emul-boot -boot-load-size 4 -isohybrid-mbr /usr/lib/ISOLINUX/isohdpfx.bin -boot-info-table -input-charset utf-8 -eltorito-alt-boot -e boot/grub/efi.img -no-emul-boot -isohybrid-gpt-basdat -o "${destination_iso}" . &>/dev/null
if [ ${focal} -eq 1 ]; then
xorriso -as mkisofs -r \
-V "ubuntu-auto-focal-$today" \
-J \
-b isolinux/isolinux.bin \
-c isolinux/boot.cat -no-emul-boot -boot-load-size 4 \
-isohybrid-mbr /usr/lib/ISOLINUX/isohdpfx.bin -boot-info-table -input-charset utf-8 \
-eltorito-alt-boot \
-e boot/grub/efi.img -no-emul-boot -isohybrid-gpt-basdat \
-o "${destination_iso}" \
. #&>/dev/null
else
xorriso -as mkisofs -r \
-V "ubuntu-auto-jammy-$today" \
--grub2-mbr "${source_iso}-hybrid.img" \
-partition_offset 16 --mbr-force-bootable \
-append_partition 2 28732ac11ff8d211ba4b00a0c93ec93b "${source_iso}-efi.img" \
-appended_part_as_gpt \
-iso_mbr_part_type a2a0d0ebe5b9334487c068b6b72699c7 \
-c '/boot.catalog' \
-b '/boot/grub/i386-pc/eltorito.img' \
-no-emul-boot -boot-load-size 4 -boot-info-table --grub2-boot-info \
-eltorito-alt-boot -e '--interval:appended_partition_2:::' \
-no-emul-boot \
-o "${destination_iso}" \
. #&>/dev/null
fi
cd "$OLDPWD"
log "👍 Repackaged into ${destination_iso}"

Expand Down

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