Automatically update Fedora boot.iso with Anaconda installer changes. v1

update_iso.sh v1

#!/bin/bash

# Create a self contained ISO image containing Anaconda changes
# =============================================================
#
# This script fetches a Fedora Rawhide boot.iso, clones the Anaconda
# installer upstream repo, creates an updates image from the repo
# and then produces an output iso that includes and automatically
# applies the updates image.
#
# How to use
# ==========
# 0. adjust the user configuration variables
#   - Rawhide ISO name (pick suitable Rawhide nightly)
#   - Anaconda tag (check Anaconda version on the image,
#     best by downloading the image and checking Anaconda
#     version number on TTY2 or possibly from image build logs)
# 1. clone Anaconda or run this script at least once
#    (it will clone the Anaconda repo if none is found)
# 2. change Anaconda source code as necessary
# 3. run the script (NOTE: the image creation step requires sudo)
# 4. boot the resulting output boot.iso via the VM software of your
#    choice (virt manager, Boxes, Cockpit Machines, virt-install, etc.)

# User configuration variables
# ===================================


RAWHIDE_ISO="Fedora-Everything-netinst-x86_64-Rawhide-20240119.n.0.iso"
ANACONDA_TAG="anaconda-40.17-1"



ANACONDA_GIT_URL="https://github.com/rhinstaller/anaconda"
RAWHIDE_ISO_URL_PREFIX="https://dl.fedoraproject.org/pub/fedora/linux/development/rawhide/Everything/x86_64/iso/"
RAWHIDE_ISO_URL=${RAWHIDE_ISO_URL_PREFIX}${RAWHIDE_ISO}
OUTPUT_ISO=${ANACONDA_TAG}"_boot.iso"

# check if we have the Rawhide boot.iso
if [ -f ${RAWHIDE_ISO} ]; then
    echo "** Rawhide boot.iso exists, skipping download"
else
    echo "** downloading Rawhide boot iso from:"
    echo ${RAWHIDE_ISO_URL}
    wget ${RAWHIDE_ISO_URL}
fi

# check if the file was actually downloaded
if [ ! -f ${RAWHIDE_ISO} ]; then
    echo "** Rawhide boot.iso download failed, check if the image URL is valid"
    exit 1
fi

# check if we have the Anaconda checkout
if [ -d "anaconda" ]; then
    echo "** Anaconda checkout exists, skipping download"
else
    echo "** cloning Anaconda:"
    echo ${ANACONDA_GIT_URL}
    git clone ${ANACONDA_GIT_URL}
fi

# create updates image
pushd anaconda
./scripts/makeupdates -k -c -t ${ANACONDA_TAG}
popd

# make sure the images folder exists
# - we need this folder so that we end up
#   with the /images/updates.img path on the
#   boot.iso
# - if /images/updates.img if detected when the
#   boot.iso boots, the updates image is automatically
#   applied
mkdir -p images

# copy the updates image to the folder
cp anaconda/updates.img images/

# check if mkksiso (needed the create the modified image) exists
if ! command -v mkksiso &> /dev/null
then
    echo "mkksiso tool not fond, please install the lorax package first"
    exit 1
fi

# remove previous output image, if any (or else mkksiso will refuse to build a new one)
if [ -f ${OUTPUT_ISO} ]; then
    echo "** removing previous output iso"
    rm -f ${OUTPUT_ISO}
fi

# create a modified boot.iso that automatically uses the updates image
# by placing it in the updates folder on the image
echo "** generating output iso with updates image"
sudo mkksiso -a images  ${RAWHIDE_ISO} ${OUTPUT_ISO}
echo "** output iso ready, boot it with a VM runner of your choice:"
echo ${OUTPUT_ISO}