Convert a roleMap (xpath /hudson/authorizationStrategy/roleMap) from a jenkins config.xml file to a yaml compatible with JCasC

jenkins_get_permissions_map_from_config_xml.sh

#!/bin/bash
#set -o xtrace

# Usage: $0 ./path-of-config.xml

getxml() { # $1 = xml file, $2 = xpath expression
  echo "cat $2" | xmllint --shell $1 |\
  sed -n 's/[^\"]*\"\([^\"]*\)\"[^\"]*/\1/gp'
}

fmt_list_to_yaml() {
  LIST=(${@})

  for ((i = 0; i < ${#LIST[@]}; i++)) ;
  do
    echo "  - \"${LIST[$i]}\""
  done;
}

adapt_role_permissions() {
  ROLE_PERMISSIONS=(${@})

  for ((i = 0; i < ${#ROLE_PERMISSIONS[@]}; i++)) ;
  do
    PERM_CATEGORY=$(echo "${ROLE_PERMISSIONS[$i]}" | rev | cut -d '.' -f 2 | rev)
    if [ "${PERM_CATEGORY}" = "CredentialsProvider" ];
    then
      PERM_CATEGORY="Credentials"
    elif [ "${PERM_CATEGORY}" = "Computer" ];
    then
      PERM_CATEGORY="Agent"
    elif [ "${PERM_CATEGORY}" = "Item" ];
    then
      PERM_CATEGORY="Job"
    elif [ "${PERM_CATEGORY}" = "Hudson" ];
    then
      PERM_CATEGORY="Overall"
    fi
    PERM_ACTION=$(echo "${ROLE_PERMISSIONS[$i]}" | rev | cut -d '.' -f 1 | rev)
    echo "${PERM_CATEGORY}/${PERM_ACTION}"
  done;
}

main() {
  eval ROLES=($(getxml "$1" "/hudson/authorizationStrategy/roleMap/role/@name" 2> /dev/null | sed -e 's/^\|$/"/g'))

  for ((i = 0; i < ${#ROLES[@]}; i++)) ;
  do
    echo "# ${ROLES[$i]}";
    ROLE_NAME="${ROLES[$i]}"
    # Pattern
    ROLE_PATTERN=$(getxml "${1}" "/hudson/authorizationStrategy/roleMap/role[@name='${ROLES[$i]}']/@pattern" 2> /dev/null)

    # Assigned ids
    ROLE_ASSIGNED_SIDS=($(cat config.xml | xmllint --xpath 'string(/hudson/authorizationStrategy/roleMap/role[@name='\""${ROLES[$i]}"\"']/assignedSIDs)' - 2>/dev/null | tr -d ' ' | sed -E '/^$/d'))

    # Role permissions
    ROLE_PERMISSIONS=($(cat config.xml | xmllint --xpath 'string(/hudson/authorizationStrategy/roleMap/role[@name='\""${ROLES[$i]}"\"']/permissions)' - 2>/dev/null | tr -d ' ' | sed -E '/^$/d'))
    ROLE_PERMISSIONS_ADAPTED=($(adapt_role_permissions ${ROLE_PERMISSIONS[@]} | sort))
    ROLE_ASSIGNED_SIDS_YAML="$(fmt_list_to_yaml ${ROLE_ASSIGNED_SIDS[@]})"
    ROLE_PERMISSIONS_YAML="$(fmt_list_to_yaml ${ROLE_PERMISSIONS_ADAPTED[@]})"

    if [ ${#ROLE_ASSIGNED_SIDS[@]} -eq 0 ];
    then
      ROLE_ASSIGNED_SIDS_YAML="[]"
    else
      ROLE_ASSIGNED_SIDS_YAML="
${ROLE_ASSIGNED_SIDS_YAML}"
    fi;

    if [ ${#ROLE_PERMISSIONS[@]} -eq 0 ];
    then
      ROLE_PERMISSIONS_YAML="[]"
    else
      ROLE_PERMISSIONS_YAML="
${ROLE_PERMISSIONS_YAML}"
    fi;

    ROLE_YAML_TPL=$(cat <<EOF
- name: "${ROLE_NAME}"
pattern: "${ROLE_PATTERN}"
permissions: ${ROLE_PERMISSIONS_YAML}
assignments: ${ROLE_ASSIGNED_SIDS_YAML}
EOF
    )

    echo "${ROLE_YAML_TPL}"
    echo
  done;
}

main $@