Install any number of .deb from arbitrary URL(s)

apt-install-from-url

#!/usr/bin/env bash
set -Eeuo pipefail
command -v curl &>/dev/null || { apt update && DEBIAN_FRONTEND=noninteractive apt install -y curl ;}
debs=() urls=() args=()
trap 'e=$?; trap - EXIT; (( ${#debs} > 0 )) && rm -f "${debs[@]}"; exit $e' EXIT
while (( $# > 0 )); do
  case "$1" in
  --) shift; break ;;
  -*) args+=("$1"); shift ;;
  *) urls+=("$1"); shift ;;
  esac
done
args+=("$@")

tmpdir="$(dirname "$(mktemp --dry-run)")"

for u in "${urls[@]}"; do
  deb="$(mktemp "${tmpdir}/XXXXXXXXXXXX.deb")"
  debs+=("$deb")
  curl -fSL "$u" -o "$deb" &
done
wait

if (( UID == 0 )); then
  chown _apt "${debs[@]}"
  chmod 400 "${debs[@]}"
fi

echo "apt install ${args[*]} ${urls[*]}"

apt install "${args[@]}" "${debs[@]}"

This is no substitute for cryptographically-signed yum/apt repos.

This is really just a hack.