#!/bin/bash -e
# description: build rootfs
# param: 1. kickstart file and 2. rootfs file name to be generated


usage() {
    cat 1>&2 <<EOF
Script to create roofs from kickstart file using livemedia-creator

ENVIRONMENT VARS:
BUILD_WORK_DIR     Working dir for kickstart source and image destination (default current directory)
BUILD_KICKSTART    Input kickstart source file (.ks)
BUILD_ROOTFS       Rootfs output file name

USAGE:
    ks2rootfs KICKSTART_FILE_NAME ROOTFS_FILE_NAME

EXAMPLES:
    ks2rootfs centos8-minimal.ks centos8-minimal.tar.xz
EOF
}

BUILD_WORK_DIR=${BUILD_WORK_DIR:-./}
BUILD_KICKSTART=${BUILD_KICKSTART:-$1}
BUILD_ROOTFS=${BUILD_ROOTFS:-$2}
BUILD_OUTDIR=${BUILD_OUTDIR:-./result}
BUILD_WRITE_META=${BUILD_WRITE_META:-true}
BUILD_RETAIN_LOG=${BUILD_RETAIN_LOG:-false}


if [ -z ${BUILD_KICKSTART} ] || [ -z ${BUILD_ROOTFS} ]
then
  echo "Please provide two parameters, kickstart source file and rootfs output file name"
  usage
  exit 1
fi

# set anaconda base product
cat << _EOF > /etc/anaconda/product.d/ks2rootfs.conf
# Anaconda configuration file for Kickstart to Rootfs.

[Product]
product_name = Kickstart to Rootfs

[Base Product]
product_name = AlmaLinux

[Storage]
file_system_type =

[License]
eula =
_EOF

# create rootfs
livemedia-creator --logfile="/tmp/rootfs-creator.log" \
    --make-tar --ks="${BUILD_WORK_DIR}/${BUILD_KICKSTART}" --no-virt \
    --image-only --image-name="${BUILD_ROOTFS}" \
    --anaconda-arg "--product Kickstart to Rootfs"

# move rootfs to working dir
cp -rp /var/tmp/${BUILD_ROOTFS} ${BUILD_WORK_DIR}/${BUILD_ROOTFS}

# extract os-release info
tar -xvf /var/tmp/${BUILD_ROOTFS} -C /tmp/ --strip-components=3 ./usr/lib/os-release
os_release_id=$(awk -F= '$1=="ID" { print $2 ;}' /tmp/os-release | tr -d '"')
distro_release=$(grep "${os_release_id}.*-release-" /tmp/anaconda/packaging.log | grep -o "Verifying:.*" | sed -n 's/Verifying: //p')

if [ -z ${distro_release+x} ]; then
    exit 1
else
    # save distro release info
    echo "$distro_release" > ${BUILD_WORK_DIR}/distro-release
fi

# save list of packages installed
jq .[] -r /tmp/dnf.cache/tempfiles.json | awk -F '/' '{print $5}' | sort > ${BUILD_WORK_DIR}/pkgs-list