Updated MAAS debug image, adds password for the root user in case of a bad networking configuration that results in the node being deployed is unable to contact the MAAS server to get its metadata.

maas-build-debug-image.bash

maas-build-debug-image() {
  local -a UBU_RELS=(bionic)
  export IMG_PWD="Ubuntu1+"
  # Create salted pw for images
  printf "\e[2G - Salting the desired password of \x22${IMG_PWD}\x22 for use in debug-image\n"
  export SALTED_PWD="$(echo 'Ubuntu1+'|mkpasswd --method=SHA-512 --rounds=4096 -s)"
  # Dowload images
  printf '%s\n' ${UBU_RELS[@]}|xargs -rn1 -P0 bash -c '
  IMG_URL=https://cloud-images.ubuntu.com/${0}/current/${0}-server-cloudimg-amd64-root.tar.xz;
  printf "\e[2G - Fetching Ubuntu release ${0^} from ${IMG_URL}\n"
  wget -qO ~/${IMG_URL##*/} --show-progress --inet4-only ${IMG_URL} 
  # Create directory for extraction
  printf "\e[2G - Creating working directory for ${0} in ~/${0} \n"
  mkdir -p ~/${0}
  # Extract image
  printf "\e[2G - Extracting ${0}\x27s squashfs to ~/${0} \n"
  sudo tar -C ~/${0} -xpSf ~/${0}-server-cloudimg-amd64-root.tar.xz --numeric-owner --xattrs "--xattrs-include=*"
  printf "\e[2G - Adding a password to the root user\x27s account\n"
  sudo sed -i "s,^root:[^:]*,root:${SALTED_PWD}," ~/${0}/etc/shadow
  printf "\e[2G - Allowing password-based authentication and root login with password over ssh\n"
  sudo sed -r -i "s/^#?(PasswordAuthentication|PermitRootLogin)[^$]*/\1 yes/g" ~/${0}/etc/ssh/sshd_config
  printf "\e[2G - Removing restrictions in root\x27s authorized_keys file\n"
  sudo sed -r -i "s/^no-.*142\x22\x20//g" ~/${0}/root/.ssh/authorized_keys
  printf "\e[2G - Re-squashing ${0}\x27s squashfs\n"
  sudo mksquashfs ~/${0}/ ~/${0}-maas-debug.squashfs -xattrs -comp xz
  ls -altr  ~/${0}-maas-debug.squashfs
  export NEW_SQUASHFS="~/${0}-maas-debug.squashfs"
  printf "\e[2G - Finding existing ${0} image in MAAS\n"
  export ORIG_SQUASHFS=$(find 2>/dev/null /var/snap/maas/common/maas/boot-resources/ -type f -regextype posix-extended -regex ".*/ga-[0-9]{2}.[0-9]{2}/${0}/stable/squashfs")
  [[ -f ${ORIG_SQUASHFS} ]] && { printf "\e[2G - Moving existing ${0} image name from squashfs to sqaushfs.orig\n"; }
  [[ -f ${ORIG_SQUASHFS} ]] && { sudo mv ${ORIG_SQUASHFS}{,.orig}; }
  [[ -f ${NEW_SQUASHFS} ]] && { printf "\e[2G - Moving ${0}-maas-debug.squashfs to squashfs for ${0}\n"; }
  [[ -f ${NEW_SQUASHFS} ]] && { sudo cp ${NEW_SQUASHFS} ${ORIG_SQUASHFS}; }
  printf "\e[2G - Setting owner to root for squashfs for ${0}\n"
  sudo chown root:root ${ORIG_SQUASHFS}
  printf "\n\e[2G\e[1;32mImportant\e[0;1m: To move back non-debug image for ${0}, please run:\n"
  echo mv $ORIG_SQUASHFS{.orig,};printf "\e[0m\n"
  '
};export -f maas-build-debug-image