#!/usr/bin/env bash
#description: common method for creating a repository from iso files(USB, dvd)

# Make sure the dvd/iso is available to the system as a CD or anywhere in the
# file system
# copy it to a local location
if="/dev/sr0"
of="/fedora.iso" # contents are in iso9660 filesystem. Need to be mounted later
repo_location="/repo"  # location mounted on the filesystem
sudo mkdir $repo_location
sudo dd if=$if of=$of bs=1M status='progress'

# Automount iso contents to repo_location to have available to machine
# unquoted delimiter in the here doc allows variable substitution
sudo cat >> /etc/fstab <<EOF
$of     $repo_location          iso9660         defaults 0 0
EOF

# verify /etc/stab changes and mount everything
sudo mount -a
ls $repo_location

# Assumes a fedora family OS but similar changes can be made in debian family
# Makes dnf aware of newly available repos 
sudo cat > /etc/yum.repos.d/base.repo <<EOF
[BaseOS]
name=BaseOS
baseurl=file://$repo_location/BaseOS
gpgcheck=0
EOF

sudo cat > /etc/yum.repos.d/appstream.repo <<EOF
[AppStream]
name=AppStream
baseurl=file://$repo_location/AppStream
gpgcheck=0
EOF