rpmbuilder-farm

#!/usr/bin/env bash
# shellcheck disable=SC2120

########################################################################################

if [[ -n "${SCRIPT_DEBUG}" ]] ; then
  set -x
fi

########################################################################################

# App name
APP="rpmbuilder-farm"

# App version
VER="1.1.0"

# App description
DESC="Helper for bootstrapping rpmbuilder build farm"

########################################################################################

# shellcheck disable=SC2034
CL_PROMPT="\e[1m\e[7;${CYAN};49m"

################################################################################

CMD_INSTALL="install"
CMD_UNINSTALL="uninstall"
CMD_USER_ADD="add-user"
CMD_USER_DEL="del-user"
CMD_USER_MOD="mod-user"
CMD_USER_LIST="list-users"
CMD_UPDATE_IMAGES="update-images"
CMD_LIST_IMAGES="list-images"
CMD_CONTAINERS="containers"
CMD_CONFIG="config"

CMD_START="start"
CMD_RESTART="restart"
CMD_STOP="stop"
CMD_START_ALL="start-all"
CMD_RESTART_ALL="restart-all"
CMD_STOP_ALL="stop-all"

###############################################################################

KEYS_DIR="/etc/rpmbuilder/keys"
START_PORT=10000

###############################################################################

# Default image name
image="ghcr.io/essentialkaos/rpmbuilder"

# List of images
images=("centos7" "ol7" "ol8" "ol9")

###############################################################################

# Main function
#
# *: All arguments passed to script
#
# Code: No
# Echo: No
main() {
  prepare

  if [[ "$1" == "--version" || "$1" == "-v" ]] ; then
    about
    exit 0
  fi

  if [[ $# -eq 0 || "$1" == "--help" || "$1" == "-h" ]] ; then
    usage
    exit 0
  fi

  execCommand "$@"

  exit $?
}

# Make some checks before executing actions
#
# Code: No
# Echo: No
prepare() {
  local answer

  if ! isRoot ; then
    exit 1
  fi

  if ! hasApp "docker" ; then
    error "docker is required, install it first"
    exit 1
  fi

  if ! hasApp "ssh-keygen" ; then
    error "ssh-keygen is required, install it first"
    exit 1
  fi

  if ! hasApp "curl" ; then
    error "curl is required, install it first"
    exit 1
  fi

  if ! hasApp "path" ; then
    show ""
    show "\e[1mpath is required, install it?\e[0m"
    read -e -r -p "$(getPrompt 'Y/N')" answer
    show ""

    if [[ ${answer^^} != "Y" ]] ; then
      error "Okay, you can install it from https://kaos.sh/path"
      exit 1
    fi

    curl --max-redirs 2 -L -# -o "/usr/bin/path" "https://apps.kaos.st/path/latest/linux/x86_64/path"
    chmod +x /usr/bin/path

    show "\e[32mpath successfully installed\e[0m"
  fi

  if ! hasApp "fmtc" ; then
    show ""
    show "\e[1mfmtc is required, install it?\e[0m"
    read -e -r -p "$(getPrompt 'Y/N')" answer
    show ""

    if [[ ${answer^^} != "Y" ]] ; then
      error "Okay, you can install it from https://kaos.sh/fmtc"
      exit 1
    fi

    curl --max-redirs 2 -L -# -o "/usr/bin/fmtc" "https://apps.kaos.st/fmtc/latest/linux/x86_64/fmtc"
    chmod +x /usr/bin/fmtc

    show "\e[32mfmtc successfully installed\e[0m"
  fi
}

# Execute command
#
# 1: Command name (String)
# *: Command arguments
#
# Code: No
# Echo: No
execCommand() {
  local cmd="$1"

  shift
  show ""

  if [[ "$cmd" != "$CMD_INSTALL" ]] && ! isFarmInstalled ; then
    error "Farm is not installed on the system"
    show ""
    return 1
  fi

  case "$cmd" in
    "$CMD_INSTALL")        cmdInstall "$@" ;;
    "$CMD_UNINSTALL")      cmdUninstall "$@" ;;
    "$CMD_USER_ADD")       cmdUserAdd "$@" ;;
    "$CMD_USER_DEL")       cmdUserDel "$@" ;;
    "$CMD_USER_MOD")       cmdUserMod "$@" ;;
    "$CMD_USER_LIST")      cmdUserList "$@" ;;
    "$CMD_LIST_IMAGES")    cmdListImages "$@" ;;
    "$CMD_UPDATE_IMAGES")  cmdUpdateImages "$@" ;;
    "$CMD_CONTAINERS")     cmdContainers "$@" ;;
    "$CMD_CONFIG")         cmdConfig "$@" ;;
    "$CMD_START")          cmdStart "$@" ;;
    "$CMD_RESTART")        cmdRestart "$@" ;;
    "$CMD_STOP")           cmdStop "$@" ;;
    "$CMD_START_ALL")      cmdStartAll "$@" ;;
    "$CMD_RESTART_ALL")    cmdRestartAll "$@" ;;
    "$CMD_STOP_ALL")       cmdStopAll "$@" ;;
    *) error "Unknown command \"$cmd\"\n"
       exit 1 ;;
  esac

  local ec=$?

  show ""

  return "$ec"
}

################################################################################

# "install" command handler
#
# 1: Restart delay in hours (Number) [Optional]
#
# Code: Yes
# Echo: No
cmdInstall() {
  local delay="${1:-12}"

  if isFarmInstalled ; then
    error "Farm already installed on the system"
    return 1
  fi

  mkdir -p "$KEYS_DIR" &> /dev/null
  action "$?" "Create directory for keys"

cat << EOF > /etc/systemd/system/rpmbuilder-farm-restart.timer
[Unit]
Description=This is the timer for restating build farm contenders
Requires=rpmbuilder-farm-restart.service

[Timer]
OnCalendar=*-*-* 00/$delay:00:00
Persistent=true

[Install]
WantedBy=timers.target
EOF

cat << EOF > /etc/systemd/system/rpmbuilder-farm-restart.service
[Unit]
Description=Restart all build farm containers
Wants=rpmbuilder-farm-restart.timer

[Service]
Type=oneshot
ExecStart=/usr/bin/rpmbuilder-farm restart-all

[Install]
WantedBy=multi-user.target
EOF

cat << EOF > /etc/systemd/system/rpmbuilder-farm.service
[Unit]
Description=RDS Sync Daemon
Documentation=https://kaos.sh/rds
Requires=network.target remote-fs.target
After=network.target remote-fs.target

[Service]
Type=oneshot
ExecStart=/usr/bin/rpmbuilder-farm start-all

[Install]
WantedBy=multi-user.target
EOF

  systemctl daemon-reload &> /dev/null
  systemctl enable rpmbuilder-farm.service &> /dev/null
  systemctl start rpmbuilder-farm-restart.timer &> /dev/null

  action 0 "Install services and timer to systemd"

  ln -sf /usr/bin/rpmbuilder-farm /usr/bin/farm

  action $? "Create alias 'farm' → 'rpmbuilder-farm'"

  show ""
  show "{g}{*}RPMBuilder Farm{!*} successfully installed on the system{!}"
  show ""

  cmdUpdateImages

  return $?
}

# "uninstall" command handler
#
# Code: Yes
# Echo: No
cmdUninstall() {
  rm -rf "$KEYS_DIR" &> /dev/null
  action "$?" "Remove directory for keys"

  systemctl disable rpmbuilder-farm.service &> /dev/null
  systemctl stop rpmbuilder-farm-restart.timer &> /dev/null

  rm -f /etc/systemd/system/rpmbuilder-farm* &> /dev/null

  systemctl daemon-reload &> /dev/null

  action 0 "Remove services and timer from systemd"

  rm -f /usr/bin/farm &> /dev/null

  action $? "Remove alias 'farm' → 'rpmbuilder-farm'"

  show ""
  show "{g}{*}RPMBuilder Farm{!*} successfully uninstalled from the system{!}"

  return 0
}

# "list-images" command handler
#
# Code: Yes
# Echo: No
cmdListImages() {
  local image_name image_id

  for image_name in "${images[@]}" ; do
    image_id=$(docker image ls | grep "node-${image_name}" | tr -s ' ' | cut -f3 -d' ')
    show "  {s-}•{!} $(getImageWithColor "$image_name") {s-}(${image_id:-—}){!}"
  done

  return 0
}

# "update-images" command handler
#
# Code: Yes
# Echo: No
cmdUpdateImages() {
  local image_name has_errors

  show "{*}Updating images…{!}"

  for image_name in "${images[@]}" ; do
    show ""
    show "{c}{*}↓{!*} ${image}:{*}node-${image_name}{!*}…{!}"
    
    if ! docker pull "$image:node-$image_name" ; then
      has_errors=true
    fi
  done

  show ""

  if [[ -n "$has_errors" ]] ; then
    warn "Can't update one or more images"
    return 1
  fi

  show "{*}Restarting containers…{!}"

  if ! cmdRestartAll ; then
    return
  fi

  show "{*}Cleaning old images…{!}"

  docker image prune -f &> /dev/null

  show ""
  show "{g}Images successfully updated{!}"

  return 0
}

# "containers" command handler
#
# Code: Yes
# Echo: No
cmdContainers() {
  if ! hasUsers ; then
    warn "There are no users or containers"
    return 0
  fi

  local user image_name stat_info uptime_info fmtline 
  local container_stat_info container_uptime_info cpu mem status host_port

  fmtc -L "{s-}Collecting containers info…{!}"
  stat_info=$(docker stats --no-stream --format '{{.Name}}\t{{.CPUPerc}}\t{{.MemUsage}}')
  uptime_info=$(docker ps --format "{{.Names}}\t{{.Status}}")
  printf '\e[2K\r'

  printf "{*}%-16s %-10s %-10s %-12s %-10s %-24s %s{!}\n" "OWNER" "IMAGE" "PORT" "STATE" "CPU" "MEMORY" "STATUS" | fmtc
  showSeparator 100

  for user in $(getUserList) ; do
    for image_name in "${images[@]}" ; do

      if isCurrentUser "$user" ; then
        fmtline="{*}%-16s{!}"
      else
        fmtline="{s}%-16s{!}"
      fi

      container_name="${user}-${image_name}"
      container_stat_info=$(grep "$container_name" <<< "$stat_info")
      container_uptime_info=$(grep "$container_name" <<< "$uptime_info")

      fmtline="$fmtline $(getImageColor "$image_name")%-10s{!}"

      if [[ -n "$container_stat_info" ]] ; then
        fmtline="$fmtline {s-}:{!}{s}%-9s{!} {g}%-12s{!} %-10s %-24s %s\n"
        cpu=$(echo "$container_stat_info" | cut -f2)
        mem=$(echo "$container_stat_info" | cut -f3)
        status=$(echo "$container_uptime_info" | cut -f2)
        host_port=$(getHostPort "$user" "$image_name")
        # shellcheck disable=SC2059
        printf "$fmtline" "$user" "$image_name" "$host_port" "running" "$cpu" "$mem" "$status" | fmtc
      else
        fmtline="$fmtline {s-}%-10s{!} {s-}%-12s{!} {s-}%-10s{!} {s-}%-24s{!} {s-}%s{!}\n"
        unset cpu mem status
        # shellcheck disable=SC2059
        printf "$fmtline" "$user" "$image_name" "-" "stopped" "-" "-" "-" | fmtc
      fi
    done

    showSeparator 100
  done

  return 0
}

# "add-user" command handler
#
# 1: User name (String)
#
# Code: Yes
# Echo: No
cmdConfig() {
  local user="$1"

  if [[ -z "$user" ]] ; then
    error "You must provide user name"
    return 1
  fi

  if ! hasContainers "$user" ; then
    error "There are no containers for user $user"
    return 1
  fi

  local ip image_name host_port

  read -e -r -p "$(getPrompt 'HOST PUBLIC IP / HOSTNAME')" ip

  show ""
  show "Add next lines to the file {#172}~/.config/rpmbuilder/buildnodes.list{!}"
  show ""

  for image_name in "${images[@]}" ; do
    if ! isContainerWorks "$user" "$image_name" ; then
      continue
    fi

    host_port=$(getHostPort "$user" "$image_name")

    show "{s}builder@${ip}:${host_port}{!}"
  done

  show ""

  fmtc << EOF
Add next lines to the file {#172}~/.config/rpmbuilder/rpmbuilder.conf{!}

{s-}# File with build nodes{!}
{s}remote: ~/.config/rpmbuilder/buildnodes.list{!}

{s-}# Path to private key{!}
{s}key: ~/.ssh/buildnode{!}

{y}Note that {*}~/.ssh/buildnode{!*} must be the path to your private key.{!}
EOF
}

# "add-user" command handler
#
# 1: User name (String)
#
# Code: Yes
# Echo: No
cmdUserAdd() {
  local user="$1"

  if [[ -z "$user" ]] ; then
    error "You must provide user name"
    return 1
  fi

  if hasUser "$user" ; then
    error "User \"$user\" already exist"
    return 1
  fi

  if ! isValidUser "$user" ; then
    error "\"$user\" is not valid user name"
    return 1
  fi

  local pub_key answer

  while : ; do
    read -e -r -p "$(getPrompt 'PUBLIC KEY')" pub_key
    show ""

    if ! isValidKey "$pub_key" ; then
      warn "Given public key is not valid"
    else
      break
    fi
  done

  if ! addUser "$user" "$pub_key" ; then
    error "Can't create new user"
    return 1
  fi

  show "{g}User successfully created{!}"
  show ""
  show "Run containers for this user?"

  read -e -r -p "$(getPrompt 'Y/N')" answer

  if [[ ${answer^^} != "Y" ]] ; then
    return 0
  fi

  # cmdStart "$user"

  return $?
}

# "del-user" command handler
#
# 1: User name (String)
#
# Code: Yes
# Echo: No
cmdUserDel() {
  local user="$1"

  if [[ -z "$user" ]] ; then
    error "You must provide user name"
    return 1
  fi

  if ! hasUser "$user" ; then
    error "There is no user \"$user\""
    return 1
  fi

  if hasContainers "$user" ; then
    if ! cmdStop "$user" ; then
      return 1
    fi

    show ""
  fi

  if ! delUser "$user" ; then
    error "Can't delete user"
    return 1
  fi

  show "{g}User successfully deleted{!}"

  return 0
}

# "mod-user" command handler
#
# 1: User name (String)
#
# Code: Yes
# Echo: No
cmdUserMod() {
  local user="$1"

  if [[ -z "$user" ]] ; then
    error "You must provide user name"
    return 1
  fi

  if ! hasUser "$user" ; then
    error "There is no user \"$user\""
    return 1
  fi

  if hasContainers "$user" ; then
    if ! cmdStop "$user" ; then
      return 1
    fi

    show ""
  fi

  local pub_key

  while : ; do
    read -e -r -p "$(getPrompt 'PUBLIC KEY')" pub_key
    show ""

    if ! isValidKey "$pub_key" ; then
      warn "Given public key is not valid"
    else
      break
    fi
  done

  if ! modUser "$user" "$pub_key" ; then
    error "Can't update public key"
    return 1
  fi

  show "{g}Public key successfully updated{!}"

  return 0
}

# "list-users" command handler
#
# Code: Yes
# Echo: No
cmdUserList() {
  if ! hasUsers ; then
    warn "There are no users"
    return 0
  fi

  local user key_info

  for user in $(getUserList) ; do

    key_info=$(getUserPubKeyInfo "$user")

    if isCurrentUser "$user" ; then
      show "  {s-}•{!} {*}$user{!} {s}—{!} {s-}$key_info{!}"
    else
      show "  {s-}•{!} {s}$user{!} {s}—{!} {s-}$key_info{!}"
    fi

  done

  return 0
}

# "start" command handler
#
# 1: User name (String)
# 2: Image name (String) [Optional]
#
# Code: Yes
# Echo: No
cmdStart() {
  local user="$1"
  local image_name="$2"

  if [[ -z "$user" ]] ; then
    error "You must provide user name"
    return 1
  fi

  if ! hasUsers ; then
    error "There are no farm users. Use \"add-user\" command to create a new user."
    return 1
  fi

  if ! hasUser "$user" ; then
    error "There is no user \"$user\""
    return 1
  fi

  if [[ -n "$image_name" ]] ; then
    cmdStartOne "$user" "$image_name"
    return $?
  fi

  cmdStartMany "$user"

  return $?
}

# "start" command handler for one container
#
# 1: User name (String)
# 2: Image name (String)
#
# Code: Yes
# Echo: No
cmdStartOne() {
  local user="$1"
  local image_name="$2"

  if ! hasImage "$image_name" ; then
    error "There is no image \"$image_name\""
    return 1
  fi

  if isContainerWorks "$user" "$image_name" ; then
    error "Container \"$user/$image_name\" already works"
    return 1
  fi

  show "{*}Starting container {#166}$user{!}{s}/{!}$(getImageWithColor "$image_name"){*}…{!}"

  if ! startContainer "$user" "$image_name" ; then
    error "Can't start container \"$user/$image_name\""
    return 1
  fi

  show "{g}Container successfully started{!}"

  return 0
}

# "start" command handler for many containers
#
# 1: User name (String)
# 2: Quiet flag (Boolean) [Optional]
#
# Code: Yes
# Echo: No
cmdStartMany() {
  local user="$1"
  local quiet="$2"

  local image_name has_actions has_problems

  for image_name in "${images[@]}" ; do
    if isContainerWorks "$user" "$image_name" ; then
      continue
    fi

    has_actions=true

    show "{*}Starting container {#166}$user{!}{s}/{!}$(getImageWithColor "$image_name"){*}…{!}"

    if ! startContainer "$user" "$image_name" ; then
      has_problems=true
      error "Can't start container"
      show ""
      continue
    fi

    show "{g}Container successfully started{!}"
    show ""
  done

  if [[ -z "$has_actions" && -z "$quiet" ]] ; then
    warn "All containers of user \"$user\" already work"
    return 0
  fi

  if [[ -n "$has_problems" ]] ; then
    warn "One or more containers started with errors"
    return 1
  fi

  if [[ -z "$quiet" ]] ; then
    show "{g}All contenders successfully started{!}"
  fi

  return 0
}

# "restart" command handler
#
# Code: Yes
# Echo: No
cmdRestart() {
  local user="$1"
  local image_name="$2"

  if [[ -z "$user" ]] ; then
    error "You must provide user name"
    return 1
  fi

  if ! hasUsers ; then
    error "There are no farm users. Use \"add-user\" command to create a new user."
    return 1
  fi

  if ! hasUser "$user" ; then
    error "There is no user \"$user\""
    return 1
  fi

  if [[ -n "$image_name" ]] ; then
    cmdRestartOne "$user" "$image_name"
    return $?
  fi

  cmdRestartMany "$user"

  return $?
}

# "restart" command handler for one container
#
# 1: User name (String)
# 2: Image name (String)
#
# Code: Yes
# Echo: No
cmdRestartOne() {
  local user="$1"
  local image_name="$2"

  if ! hasImage "$image_name" ; then
    error "There is no image \"$image_name\""
    return 1
  fi

  if ! isContainerWorks "$user" "$image_name" ; then
    error "Container \"$user/$image_name\" is not running"
    return 1
  fi

  show "{*}Restarting container {#166}$user{!}{s}/{!}$(getImageWithColor "$image_name"){*}…{!}"

  if ! stopContainer "$user" "$image_name" ; then
    error "Can't stop container \"$user/$image_name\""
    return 1
  fi

  if ! startContainer "$user" "$image_name" ; then
    error "Can't start container \"$user/$image_name\""
    return 1
  fi

  show "{g}Container successfully restarted{!}"

  return 0
}

# "restart" command handler for many containers
#
# 1: User name (String)
# 2: Quiet flag (Boolean) [Optional]
#
# Code: Yes
# Echo: No
cmdRestartMany() {
  local user="$1"
  local quiet="$2"

  local image_name has_actions has_problems

  for image_name in "${images[@]}" ; do
    if ! isContainerWorks "$user" "$image_name" ; then
      continue
    fi

    has_actions=true

    show "{*}Restarting container {#166}$user{!}{s}/{!}$(getImageWithColor "$image_name"){*}…{!}"

    if ! stopContainer "$user" "$image_name" ; then
      has_problems=true
      error "Can't stop container \"$user/$image_name\""
      show ""
      continue
    fi

    if ! startContainer "$user" "$image_name" ; then
      has_problems=true
      error "Can't start container \"$user/$image_name\""
      show ""
      continue
    fi

    show "{g}Container successfully restarted{!}"
    show ""
  done

  if [[ -z "$has_actions" && -z "$quiet" ]] ; then
    warn "All containers of user \"$user\" are stopped and no restart is required"
    return 0
  fi

  if [[ -n "$has_problems" ]] ; then
    warn "One or more containers restarted with errors"
    return 1
  fi

  if [[ -z "$quiet" ]] ; then
    show "{g}All contenders successfully restarted{!}"
  fi

  return 0
}

# "stop" command handler
#
# Code: Yes
# Echo: No
cmdStop() {
  local user="$1"
  local image_name="$2"

  if [[ -z "$user" ]] ; then
    error "You must provide user name"
    return 1
  fi

  if ! hasUser "$user" ; then
    error "There is no user \"$user\""
    return 1
  fi

  if [[ -n "$image_name" ]] ; then
    cmdStopOne "$user" "$image_name"
    return $?
  fi

  cmdStopMany "$user"

  return $?
}

# "stop" command handler for one container
#
# 1: User name (String)
# 2: Image name (String)
#
# Code: Yes
# Echo: No
cmdStopOne() {
  local user="$1"
  local image_name="$2"

  if ! hasImage "$image_name" ; then
    error "There is no image \"$image_name\""
    return 1
  fi

  if ! isContainerWorks "$user" "$image_name" ; then
    error "Container \"$user/$image_name\" is stopped"
    return 1
  fi

  show "{*}Stopping container {#166}$user{!}{s}/{!}$(getImageWithColor "$image_name"){*}…{!}"

  if ! stopContainer "$user" "$image_name" ; then
    error "Can't stop container \"$user/$image_name\""
  fi

  show "{g}Container successfully stopped{!}"

  return 0
}

# "stop" command handler for many containers
#
# 1: User name (String)
# 2: Quiet flag (Boolean) [Optional]
#
# Code: Yes
# Echo: No
cmdStopMany() {
  local user="$1"
  local quiet="$2"

  local image_name has_actions has_problems

  for image_name in "${images[@]}" ; do
    if ! isContainerWorks "$user" "$image_name" ; then
      continue
    fi

    has_actions=true

    show "{*}Stopping container {#166}$user{!}{s}/{!}{#81}$image_name{!}{*}…{!}"

    if ! stopContainer "$user" "$image_name" ; then
      has_problems=true
      error "Can't stop container"
      show ""
      continue
    fi

    show "{g}Container successfully stopped{!}"
    show ""
  done

  if [[ -z "$has_actions" && -z "$quiet" ]] ; then
    warn "All containers of user \"$user\" already stopped"
    return 0
  fi

  if [[ -n "$has_problems" ]] ; then
    warn "One or more containers stopped with errors"
    return 1
  fi

  if [[ -z "$quiet" ]] ; then
    show "{g}All contenders successfully stopped{!}"
  fi

  return 0
}

# "start-all" command handler
#
# Code: Yes
# Echo: No
cmdStartAll() {
  if ! hasUsers ; then
    warn "There are no users or containers"
    return 0
  fi

  local user has_problems

  for user in $(getUserList) ; do
    if ! cmdStartMany "$user" true ; then
      has_problems=true
    fi
  done

  if [[ -n "$has_problems" ]] ; then
    return 1
  fi

  show "{g}All containers successfully started{!}"

  return 0
}

# "restart-all" command handler
#
# Code: Yes
# Echo: No
cmdRestartAll() {
  if ! hasUsers ; then
    warn "There are no users or containers"
    return 0
  fi

  local user has_problems

  for user in $(getUserList) ; do
    if ! cmdRestartMany "$user" true ; then
      has_problems=true
    fi
  done

  if [[ -n "$has_problems" ]] ; then
    return 1
  fi

  show "{g}All containers successfully restarted{!}"

  return 0
}

# "stop-all" command handler
#
# Code: Yes
# Echo: No
cmdStopAll() {
  if ! hasUsers ; then
    warn "There are no users or containers"
    return 0
  fi

  local user has_problems

  for user in $(getUserList) ; do
    if ! cmdStopMany "$user" true ; then
      has_problems=true
    fi
  done

  if [[ -n "$has_problems" ]] ; then
    return 1
  fi

  show "{g}All containers successfully stopped{!}"

  return 0
}

################################################################################

# Print action status
#
# 1: Status (Number)
# 2: Description (String)
#
# Code: No
# Echo: No
action() {
  local status="$1"
  local desc="$2"

  if [[ "$status" == "0" ]] ; then
    show "{g}✔ {!} $desc"
  else
    show "{r}✖ {!} $desc"
  fi
}

# Check if there is running containers for user
#
# 1: User name (String)
#
# Code: Yes
# Echo: No
hasContainers() {
  local user="$1"

  if [[ -n $(docker ps -q -f name="${user}-*") ]] ; then
    return 0
  fi

  return 1
}

# Start user's container
#
# 1: User name (String)
# 2: Image name (String)
#
# Code: Yes
# Echo: No
startContainer() {
  local user="$1"
  local image_name="$2"
  local host_port target_port pub_key container_name

  if ! hasImage "$image_name" ; then
    return 1
  fi

  pub_key=$(getUserPubKeyData "$user")
  host_port=$(getHostPort "$user" "$image_name")
  target_port=$(getImageTargetPort "$image_name")

  container_name="${user}-${image_name}"

  if [[ -z "$host_port" || -z "$target_port" || -z "$pub_key" ]] ; then
    return 1
  fi

  docker run --name "$container_name" \
             -e PUB_KEY="$pub_key" \
             -p "$host_port:$target_port" \
             -d "$image:node-$image_name" &>/dev/null

  return $?
}

# Stop one or all user's containers
#
# 1: User name (String)
# 2: Image name (String)
#
# Code: Yes
# Echo: No
stopContainer() {
  local user="$1"
  local image_name="$2"
  local container_name="${user}-${image_name}"

  local cid

  cid=$(docker ps -q -f name="$container_name")

  if ! docker kill "$cid" &> /dev/null ; then
    return 1
  fi

  if ! docker rm "$container_name" &> /dev/null ; then
    return 1
  fi

  return 0
}

# Check if container for given user already works
#
# 1: User name (String)
# 2: Image name (String) [Optional]
#
# Code: Yes
# Echo: No
isContainerWorks() {
  local user="$1"
  local image_name="$2"
  local container_name="${user}-${image_name}"

  if [[ -n $(docker ps -q -f name="${container_name}") ]] ; then
    return 0
  fi

  return 1
}

# Check if rpmbuilder farm is installed
#
# Code: Yes
# Echo: No
isFarmInstalled() {
  if [[ ! -d "$KEYS_DIR" ]] ; then
    return 1
  fi

  return 0
}

# Add new user
#
# 1: User name (String)
# 2: Public key (String)
#
# Code: Yes
# Echo: No
addUser() {
  local user="$1"
  local pub_key="$2"
  local id pub_key_file

  id=$(getFreeUserID)

  if [[ -z "$id" ]] ; then
    return 1
  fi

  mkdir "$KEYS_DIR/$id" &> /dev/null

  pub_key_file="$KEYS_DIR/${id}/${user}.pub"

  if ! echo "$pub_key" > "$pub_key_file" ; then
    return 1
  fi

  chmod 600 "$pub_key_file" &> /dev/null

  return $?
}

# Remove user
#
# 1: User name (String)
#
# Code: Yes
# Echo: No
delUser() {
  local user="$1"
  local pub_key_file pub_key_dir

  pub_key_file=$(getUserPubKeyFile "$user")

  if [[ -z "$pub_key_file" ]] ; then
    return 1
  fi

  pub_key_dir=$(path dir "$pub_key_file")

  rm -rf "$pub_key_dir" &> /dev/null

  return $?
}

# Update user public key
#
# 1: User name (String)
#
# Code: Yes
# Echo: No
modUser() {
  local user="$1"
  local pub_key_file

  pub_key_file=$(getUserPubKeyFile "$user")

  if [[ -z "$pub_key_file" ]] ; then
    return 1
  fi

  echo "$pub_key" > "$pub_key_file"

  return 0
}

# Check if farm has any users
#
# Code: Yes
# Echo: No
hasUsers() {
  if [[ -z $(find $KEYS_DIR -name '*.pub' -type f) ]] ; then
    return 1
  fi

  return 0
}

# Check if user exist
#
# 1: User name (String)
#
# Code: Yes
# Echo: No
hasUser() {
  local user="$1"

  if [[ -n $(find $KEYS_DIR -name "${user}.pub" -type f) ]] ; then
    return 0
  fi

  return 1
}

# Get user ID
#
# 1: User name (String)
#
# Code: No
# Echo: User ID (String)
getUserID() {
  local user="$1"
  local pub_key_file

  pub_key_file=$(getUserPubKeyFile "$user")

  if [[ -z "$pub_key_file" ]] ; then
    return 1
  fi

  path dir "$pub_key_file" | path base
}

# Get path to user's public key file
#
# 1: User name (String)
#
# Code: No
# Echo: Path to public key file (String)
getUserPubKeyFile() {
  local user="$1"
  find $KEYS_DIR -name "${user}.pub" -type f
}

# Get info about user public key
#
# 1: User name (String)
#
# Code: No
# Echo: Key info (String)
getUserPubKeyInfo() {
  local user="$1"
  local pub_key_file

  pub_key_file=$(find $KEYS_DIR -name "${user}.pub" -type f)

  if [[ -z "$pub_key_file" ]] ; then
    return
  fi

  ssh-keygen -lf "$pub_key_file" | sed 's/no comment //'
}

# Get list of users
#
# Code: No
# Echo: User list (String)
getUserList() {
  find $KEYS_DIR -name "*.pub" -type f | path base | path del-suffix ".pub"
}

# Get user's public key data
#
# 1: Variable Description (Type)
#
# Code: No
# Echo: No
getUserPubKeyData() {
  local user="$1"
  local pub_key

  pub_key=$(getUserPubKeyFile "$user")

  if [[ -n "$pub_key" ]] ; then
    cat "$pub_key"
  fi
}

# Get free user ID
#
# Code: No
# Echo: User ID (Number)
getFreeUserID() {
  for id in {1..256} ; do
    if [[ ! -d "$KEYS_DIR/$id" ]] ; then
      echo "$id"
      return
    fi
  done
}

# Check if user name is valid
#
# 1: User name (String)
#
# Code: Yes
# Echo: No
isValidUser() {
  local user="$1"

  if [[ "$user" =~ ^[a-zA-Z0-9_-]+$ ]] ; then
    return 0
  fi

  return 1
}

# Check if public key is valid
#
# 1: Public key data (String)
#
# Code: Yes
# Echo: No
isValidKey() {
  local pub_key="$1"

  echo "$pub_key" | ssh-keygen -lf - &> /dev/null

  return $?
}

# Get target port for given image
#
# 1: Image name (String)
#
# Code: No
# Echo: Port (Number)
getImagePort() {
  case "$1" in
    "centos7") echo "27" ;;
    "ol7")     echo "37" ;;
    "ol8")     echo "38" ;;
    "ol9")     echo "39" ;;
  esac
}

# Get target port for given image
#
# 1: Image name (String)
#
# Code: No
# Echo: Port (Number)
getImageTargetPort() {
  local image_name="$1"
  local port

  port=$(getImagePort "$image_name")

  if [[ -z "$port" ]] ; then
    return
  fi

  port=$(( 2000 + port ))

  echo "$port"
}

# Get port for user container
#
# 1: User name (String)
# 2: Image name (String)
#
# Code: No
# Echo: Port (Number)
getHostPort() {
  local user="$1"
  local image_name="$2"

  local port image_port user_id

  user_id=$(getUserID "$user")
  image_port=$(getImagePort "$image_name")

  if [[ -z "$user_id" || -z "$image_port" ]] ; then
    return
  fi

  port=$(( ((user_id * 1000) + (START_PORT - 1000)) + image_port ))

  echo "$port"
}

# Check if image exist
#
# 1: Image name (String)
#
# Code: No
# Echo: No
hasImage() {
  if [[ -n $(getImagePort "$1") ]] ; then
    return 0
  fi

  return 1
}

# Get colored image name
#
# 1: Image name (String)
#
# Code: No
# Echo: Image name with color (String)
getImageWithColor() {
  case "$1" in
    "centos7") echo "{#75}$1{!}" ;;
    "ol7")     echo "{#113}$1{!}" ;;
    "ol8")     echo "{#174}$1{!}" ;;
    "ol9")     echo "{#99}$1{!}" ;;
    *)         echo "$1"
  esac
}

# Get image unique color
#
# 1: Image name (String)
#
# Code: No
# Echo: Image color tag (String)
getImageColor() {
  case "$1" in
    "centos7") echo "{#75}" ;;
    "ol7")     echo "{#113}" ;;
    "ol8")     echo "{#174}" ;;
    "ol9")     echo "{#99}" ;;
  esac
}

# Check if given name is current user name
#
# 1: User name (String)
#
# Code: Yes
# Echo: No
isCurrentUser() {
  local user="$1"

  if [[ "$SUDO_USER" == "$user" ]] ; then
    return 0
  fi

  return 1
}

################################################################################

# Check if user is root
#
# 1: Quiet check (Boolean) [Optional]
#
# Code: Yes
# Echo: No
isRoot() {
  if [[ $(id -u) != "0" ]] ; then
    if [[ -z "$1" ]] ; then
      error "This command requires superuser privileges"
    fi

    return 1
  fi

  return 0
}

# Check if app is installed
#
# 1: Binary name (String)
#
# Code: Yes
# Echo: No
hasApp() {
  if ! type -P "$1" &> /dev/null ; then
    return 1
  fi

  return 0
}

# Print separator
#
# 1: Separator size (Number)
#
# Code: No
# Echo: No
showSeparator() {
  local size="$1"
  local sep i

  # shellcheck disable=SC2034
  for i in $(seq 0 "$size") ; do
    sep="${sep}–"
  done

  show "{s-}$sep{!}"
}

# Get colored prompt
#
# 1: Prompt name (String)
#
# Code: No
# Echo: No
getPrompt() {
  echo -e "\e[1m\e[7;36;49m ≡ ${1^^} \e[0m\e[0;36;49m\e[0m "
}

# Show error message
#
# 1: Message (String)
#
# Code: No
# Echo: No
error() {
  echo -e "\e[0;31;49m▲ $*\e[0m" 1>&2
}

# Show warning message
#
# 1: Message (String)
#
# Code: No
# Echo: No
warn() {
  echo -e "\e[0;33;49m▲ $*\e[0m" 1>&2
}

# Show message
#
# 1: Message (String)
# 2: Color code (Number) [Optional]
#
# Code: No
# Echo: No
show() {
  if [[ -z "$*" ]] ; then
    echo -e ""
  elif [[ $* =~ \{ ]] ; then
    fmtc "$*"
  else
    echo -e "$*"
  fi
}

################################################################################

# Print usage info
#
# Code: No
# Echo: No
usage() {
fmtc << EOF

{*}Usage:{!} rpmbuilder-farm {y}{command}{!} {s}arg…{!}

{*}Basic commands{!}

  {y}${CMD_INSTALL}{!} {s-}restart-delay{!} {s-}..{!} Install farm on the system
  {y}${CMD_UNINSTALL}{!} {s-}..............{!} Uninstall farm from the system
  {y}${CMD_USER_ADD}{!} {s}user{!} {s-}..........{!} Add new user
  {y}${CMD_USER_DEL}{!} {s}user{!} {s-}..........{!} Remove user and it containers
  {y}${CMD_USER_MOD}{!} {s}user{!} {s-}..........{!} Modify user public key
  {y}${CMD_USER_LIST}{!} {s-}..............{!} List users
  {y}${CMD_LIST_IMAGES}{!} {s-}............{!} Show list of all official images
  {y}${CMD_UPDATE_IMAGES}{!} {s-}..........{!} Update all official images
  {y}${CMD_CONTAINERS}{!} {s-}.............{!} Show list of containers with their status
  {y}${CMD_CONFIG}{!} {s-}.................{!} Show configuration guide

{*}Containers commands{!}

  {y}${CMD_START}{!} {s}user{!} {s-}image-name{!} {s-}....{!} Start containers for given user
  {y}${CMD_RESTART}{!} {s}user{!} {s-}image-name{!} {s-}..{!} Restart containers for given user
  {y}${CMD_STOP}{!} {s}user{!} {s-}image-name{!} {s-}.....{!} Stop containers for given user
  {y}${CMD_START_ALL}{!} {s-}................{!} Start containers for all users
  {y}${CMD_RESTART_ALL}{!} {s-}..............{!} Restart containers for all users
  {y}${CMD_STOP_ALL}{!} {s-}.................{!} Stop containers for all users

{*}Options{!}

  {g}--help{!}, {g}-h{!} {s-}.....{!} Show this help message
  {g}--version{!}, {g}-v{!} {s-}..{!} Show information about version

{*}Examples{!}

  $APP $CMD_STOP_ALL
  {&}{s-}Stop all containers{!}

  $APP $CMD_RESTART john
  {&}{s-}Restart containers for user john{!}

EOF
}

# Show info about version
#
# Code: No
# Echo: No
about() {
  local docker_ver

  if hasApp "docker" ; then
    docker_ver=$(docker version -f '{{.Server.Version}} (git:{{.Server.GitCommit}})' 2>/dev/null)
  fi

fmtc << EOF

{c*}$APP{!} {c}$VER{!} — $DESC
{s-}│{!}
{s-}└ Docker: ${docker_ver:-—}{!}

{s-}Copyright (C) 2009-$(date +%Y) ESSENTIAL KAOS{!}
{s-}Apache License, Version 2.0 <https://www.apache.org/licenses/LICENSE-2.0>{!}

EOF
}

################################################################################

main "$@"