#!/usr/bin/env bash
VERSION="v0.5.4.0"
### ChangeNotes: Added support for a Prometheus+node_exporter metric collection through a file collector.
Github="https://github.com/mag37/dockcheck"
RawUrl="https://raw.githubusercontent.com/mag37/dockcheck/main/dockcheck.sh"

# Variables for self updating
ScriptArgs=( "$@" )
ScriptPath="$(readlink -f "$0")"
ScriptWorkDir="$(dirname "$ScriptPath")"

# Check if there's a new release of the script
LatestRelease="$(curl -s -r 0-50 $RawUrl | sed -n "/VERSION/s/VERSION=//p" | tr -d '"')"
LatestChanges="$(curl -s -r 0-200 $RawUrl | sed -n "/ChangeNotes/s/# ChangeNotes: //p")"

# Help Function
Help() {
  echo "Syntax:     dockcheck.sh [OPTION] [part of name to filter]"
  echo "Example:    dockcheck.sh -y -d 10 -e nextcloud,heimdall"
  echo
  echo "Options:"
  echo "-a|y   Automatic updates, without interaction."
  echo "-c     Exports metrics as prom file for the prometheus node_exporter. Provide the collector textfile directory."
  echo "-d N   Only update to new images that are N+ days old. Lists too recent with +prefix and age. 2xSlower."
  echo "-e X   Exclude containers, separated by comma."
  echo "-f     Force stack restart after update. Caution: restarts once for every updated container within stack."
  echo "-h     Print this Help."
  echo "-i     Inform - send a preconfigured notification."
  echo "-l     Only update if label is set. See readme."
  echo "-m     Monochrome mode, no printf color codes."
  echo "-n     No updates; only checking availability."
  echo "-p     Auto-prune dangling images after update."
  echo "-r     Allow updating images for docker run; won't update the container."
  echo "-s     Include stopped containers in the check. (Logic: docker ps -a)."
  echo "-t     Set a timeout (in seconds) per container for registry checkups, 10 is default."
  echo "-v     Prints current version."
  echo
  echo "Project source: $Github"
}

# Colors
c_red="\033[0;31m"
c_green="\033[0;32m"
c_yellow="\033[0;33m"
c_blue="\033[0;34m"
c_teal="\033[0;36m"
c_reset="\033[0m"

Timeout=10
Stopped=""
while getopts "aynpfrhlisvmc:e:d:t:" options; do
  case "${options}" in
    a|y) AutoUp="yes" ;;
    c)   CollectorTextFileDirectory="${OPTARG}"
         if ! [[ -d  $CollectorTextFileDirectory ]] ; then { printf "The directory (%s) does not exist.\n" "${CollectorTextFileDirectory}"  ; exit 2; } fi ;;
    n)   AutoUp="no" ;;
    r)   DRunUp="yes" ;;
    p)   AutoPrune="yes" ;;
    l)   OnlyLabel=true ;;
    f)   ForceRestartStacks=true ;;
    i)   [ -s "$ScriptWorkDir"/notify.sh ] && { source "$ScriptWorkDir"/notify.sh ; Notify="yes" ; } ;;
    e)   Exclude=${OPTARG} ;;
    m)   declare c_{red,green,yellow,blue,teal,reset}="" ;;
    s)   Stopped="-a" ;;
    t)   Timeout="${OPTARG}" ;;
    v)   printf "%s\n" "$VERSION" ; exit 0 ;;
    d)   DaysOld=${OPTARG}
         if ! [[ $DaysOld =~ ^[0-9]+$ ]] ; then { printf "Days -d argument given (%s) is not a number.\n" "${DaysOld}" ; exit 2 ; } ; fi ;;
    h|*) Help ; exit 2 ;;
  esac
done
shift "$((OPTIND-1))"

# Self-update function
self_update_curl() {
  cp "$ScriptPath" "$ScriptPath".bak
  if [[ $(command -v curl) ]]; then
    curl -L $RawUrl > "$ScriptPath" ; chmod +x "$ScriptPath"
    printf "\n%s\n" "--- starting over with the updated version ---"
    exec "$ScriptPath" "${ScriptArgs[@]}" # run the new script with old arguments
    exit 1 # Exit the old instance
  elif [[ $(command -v wget) ]]; then
    wget $RawUrl -O "$ScriptPath" ; chmod +x "$ScriptPath"
    printf "\n%s\n" "--- starting over with the updated version ---"
    exec "$ScriptPath" "${ScriptArgs[@]}" # run the new script with old arguments
    exit 1 # Exit the old instance
  else
    printf "curl/wget not available - download the update manually: %s \n" "$Github"
  fi
}

self_update() {
  cd "$ScriptWorkDir" || { printf "Path error, skipping update.\n" ; return ; }
  if [[ $(command -v git) ]] && [[ "$(git ls-remote --get-url 2>/dev/null)" =~ .*"mag37/dockcheck".* ]] ; then
    printf "\n%s\n" "Pulling the latest version."
    git pull --force || { printf "Git error, manually pull/clone.\n" ; return ; }
    printf "\n%s\n" "--- starting over with the updated version ---"
    cd - || { printf "Path error.\n" ; return ; }
    exec "$ScriptPath" "${ScriptArgs[@]}" # run the new script with old arguments
    exit 1 # exit the old instance
  else
    cd - || { printf "Path error.\n" ; return ; }
    self_update_curl
  fi
}

# Choose from list function
choosecontainers() {
  while [[ -z "$ChoiceClean" ]]; do
    read -r -p "Enter number(s) separated by comma, [a] for all - [q] to quit: " Choice
    if [[ "$Choice" =~ [qQnN] ]] ; then
      exit 0
    elif [[ "$Choice" =~ [aAyY] ]] ; then
      SelectedUpdates=( "${GotUpdates[@]}" )
      ChoiceClean=${Choice//[,.:;]/ }
    else
      ChoiceClean=${Choice//[,.:;]/ }
      for CC in $ChoiceClean ; do
        if [[ "$CC" -lt 1 || "$CC" -gt $UpdCount ]] ; then # Reset choice if out of bounds
          echo "Number not in list: $CC" ; unset ChoiceClean ; break 1
        else
          SelectedUpdates+=( "${GotUpdates[$CC-1]}" )
        fi
      done
    fi
  done
  printf "\nUpdating containers:\n"
  printf "%s\n" "${SelectedUpdates[@]}"
  printf "\n"
}

datecheck() {
  ImageDate=$($regbin -v error image inspect "$RepoUrl" --format='{{.Created}}' | cut -d" " -f1 )
  ImageAge=$(( ( $(date +%s) - $(date -d "$ImageDate" +%s) )/86400 ))
  if [ "$ImageAge" -gt "$DaysOld" ] ; then
    return 0
  else
    return 1
  fi
}

progress_bar() {
  QueCurrent="$1"
  QueTotal="$2"
  ((Percent=100*QueCurrent/QueTotal))
  ((Complete=50*Percent/100)) # Change first number for width (50)
  ((Left=50-Complete)) # Change first number for width (50)
  BarComplete=$(printf "%${Complete}s" | tr " " "#")
  BarLeft=$(printf "%${Left}s" | tr " " "-")
  [[ "$QueTotal" == "$QueCurrent" ]] || printf "\r[%s%s] %s/%s " "$BarComplete" "$BarLeft" "$QueCurrent" "$QueTotal"
  [[ "$QueTotal" == "$QueCurrent" ]] && printf "\r[%b%s%b] %s/%s \n" "$c_teal" "$BarComplete" "$c_reset" "$QueCurrent" "$QueTotal"
}

# Function to add user-provided urls to releasenotes
releasenotes() { 
  for update in ${GotUpdates[@]}; do
    found=false
    while read -r container url; do
      [[ $update == $container ]] && Updates+=("$update  ->  $url") && found=true
    done < "$ScriptWorkDir"/urls.list
    [[ $found == false ]] && Updates+=("$update  ->  url missing") || continue
  done
}

# Version check & initiate self update
if [[ "$VERSION" != "$LatestRelease" ]] ; then
  printf "New version available! %b%s%b ⇒ %b%s%b \n Change Notes: %s \n" "$c_yellow" "$VERSION" "$c_reset" "$c_green" "$LatestRelease" "$c_reset" "$LatestChanges"
  if [[ -z "$AutoUp" ]] ; then
    read -r -p "Would you like to update? y/[n]: " SelfUpdate
    [[ "$SelfUpdate" =~ [yY] ]] && self_update
  fi
fi

# Set $1 to a variable for name filtering later
SearchName="$1"
# Create array of excludes
IFS=',' read -r -a Excludes <<< "$Exclude" ; unset IFS

# Static binary downloader for dependencies
binary_downloader() {
  BinaryName="$1"
  BinaryUrl="$2"
  case "$(uname --machine)" in
    x86_64|amd64) architecture="amd64" ;;
    arm64|aarch64) architecture="arm64";;
    *) printf "\n%bArchitecture not supported, exiting.%b\n" "$c_red" "$c_reset" ; exit 1;;
  esac
  GetUrl="${BinaryUrl/TEMP/"$architecture"}"
  if [[ $(command -v curl) ]]; then curl -L $GetUrl > "$ScriptWorkDir/$BinaryName" ; 
  elif [[ $(command -v wget) ]]; then wget $GetUrl -O "$ScriptWorkDir/$BinaryName" ; 
  else printf "%s\n" "curl/wget not available - get $BinaryName manually from the repo link, exiting."; exit 1;
  fi
  [[ -f "$ScriptWorkDir/$BinaryName" ]] && chmod +x "$ScriptWorkDir/$BinaryName"
}

distro_checker() {
  if [[ -f /etc/arch-release ]] ; then PkgInstaller="pacman -S"
  elif [[ -f /etc/redhat-release ]] ; then PkgInstaller="dnf install"
  elif [[ -f /etc/SuSE-release ]] ; then PkgInstaller="zypper install"
  elif [[ -f /etc/debian_version ]] ; then PkgInstaller="apt-get install"
  else PkgInstaller="ERROR" ; printf "\n%bNo distribution could be determined%b, falling back to static binary.\n" "$c_yellow" "$c_reset"
  fi
}

# Dependency check for jq in PATH or directory
if [[ $(command -v jq) ]]; then jqbin="jq" ;
elif [[ -f "$ScriptWorkDir/jq" ]]; then jqbin="$ScriptWorkDir/jq" ;
else
  printf "%s\n" "Required dependency 'jq' missing, do you want to install it?"
  read -r -p "y: With packagemanager (sudo). / s: Download static binary. y/s/[n] " GetJq
  GetJq=${GetJq:-no} # set default to no if nothing is given
  if [[ "$GetJq" =~ [yYsS] ]] ; then
    [[ "$GetJq" =~ [yY] ]] && distro_checker
    if [[ -n "$PkgInstaller" && "$PkgInstaller" != "ERROR" ]] ; then 
      (sudo $PkgInstaller jq) ; PkgExitcode="$?"
      [[ "$PkgExitcode" == 0 ]] && jqbin="jq" || printf "\n%bPackagemanager install failed%b, falling back to static binary.\n" "$c_yellow" "$c_reset"
    fi
    if [[ "$GetJq" =~ [nN] || "$PkgInstaller" == "ERROR" || "$PkgExitcode" != 0 ]] ; then
        binary_downloader "jq" "https://github.com/jqlang/jq/releases/latest/download/jq-linux-TEMP"
        [[ -f "$ScriptWorkDir/jq" ]] && jqbin="$ScriptWorkDir/jq" 
    fi
  else printf "\n%bDependency missing, exiting.%b\n" "$c_red" "$c_reset" ; exit 1 ;
  fi
fi
# Final check if binary is correct
$jqbin --version &> /dev/null  || { printf "%s\n" "jq is not working - try to remove it and re-download it, exiting."; exit 1; }

# Dependency check for regctl in PATH or directory
if [[ $(command -v regctl) ]]; then regbin="regctl" ;
elif [[ -f "$ScriptWorkDir/regctl" ]]; then regbin="$ScriptWorkDir/regctl" ;
else
  read -r -p "Required dependency 'regctl' missing, do you want it downloaded? y/[n] " GetRegctl
  if [[ "$GetRegctl" =~ [yY] ]] ; then
    binary_downloader "regctl" "https://github.com/regclient/regclient/releases/latest/download/regctl-linux-TEMP"
    [[ -f "$ScriptWorkDir/regctl" ]] && regbin="$ScriptWorkDir/regctl" 
  else printf "\n%bDependency missing, exiting.%b\n" "$c_red" "$c_reset" ; exit 1 ;
  fi
fi
# Final check if binary is correct
$regbin version &> /dev/null  || { printf "%s\n" "regctl is not working - try to remove it and re-download it, exiting."; exit 1; }

# Check docker compose binary
if docker compose version &> /dev/null ; then DockerBin="docker compose" ;
elif docker-compose -v &> /dev/null; then DockerBin="docker-compose" ;
elif docker -v &> /dev/null; then
  printf "%s\n" "No docker compose binary available, using plain docker (Not recommended!)"
  printf "%s\n" "'docker run' will ONLY update images, not the container itself."
else
  printf "%s\n" "No docker binaries available, exiting."
  exit 1
fi

# Numbered List function
options() {
num=1
for i in "${GotUpdates[@]}"; do
  echo "$num) $i"
  ((num++))
done
}

# Listing typed exclusions
if [[ -n ${Excludes[*]} ]] ; then
  printf "\n%bExcluding these names:%b\n" "$c_blue" "$c_reset"
  printf "%s\n" "${Excludes[@]}"
  printf "\n"
fi

# Variables for progress_bar function
ContCount=$(docker ps $Stopped --filter "name=$SearchName" --format '{{.Names}}' | wc -l)
RegCheckQue=0

# Testing and setting timeout binary
t_out=$(command -v timeout)
if [[ $t_out ]]; then
  t_out=$(realpath $t_out 2>/dev/null || readlink -f $t_out)
  if [[ $t_out =~ "busybox" ]]; then
    t_out="timeout ${Timeout}"
  else t_out="timeout --foreground ${Timeout}"
  fi
else t_out=""
fi

# Check the image-hash of every running container VS the registry
for i in $(docker ps $Stopped --filter "name=$SearchName" --format '{{.Names}}') ; do
  ((RegCheckQue+=1))
  progress_bar "$RegCheckQue" "$ContCount"
  # Looping every item over the list of excluded names and skipping
  for e in "${Excludes[@]}" ; do [[ "$i" == "$e" ]] && continue 2 ; done
  ImageId=$(docker inspect "$i" --format='{{.Image}}')
  RepoUrl=$(docker inspect "$i" --format='{{.Config.Image}}')
  LocalHash=$(docker image inspect "$ImageId" --format '{{.RepoDigests}}')
  # Checking for errors while setting the variable
  if RegHash=$(${t_out} $regbin -v error image digest --list "$RepoUrl" 2>&1) ; then
    if [[ "$LocalHash" = *"$RegHash"* ]] ; then
      NoUpdates+=("$i")
    else
      if [[ -n "$DaysOld" ]] && ! datecheck ; then
        NoUpdates+=("+$i ${ImageAge}d")
      else
        GotUpdates+=("$i")
      fi
    fi
  else
    # Here the RegHash is the result of an error code
    GotErrors+=("$i - ${RegHash}")
  fi
done

# Sort arrays alphabetically
IFS=$'\n'
NoUpdates=($(sort <<<"${NoUpdates[*]}"))
GotUpdates=($(sort <<<"${GotUpdates[*]}"))
unset IFS

# Run the prometheus exporter function
if [ -n "$CollectorTextFileDirectory" ] ; then
  source "$ScriptWorkDir"/addons/prometheus/prometheus_collector.sh && prometheus_exporter ${#NoUpdates[@]} ${#GotUpdates[@]} ${#GotError[@]}
fi

# Define how many updates are available
UpdCount="${#GotUpdates[@]}"

# List what containers got updates or not
if [[ -n ${NoUpdates[*]} ]] ; then
  printf "\n%bContainers on latest version:%b\n" "$c_green" "$c_reset"
  printf "%s\n" "${NoUpdates[@]}"
fi
if [[ -n ${GotErrors[*]} ]] ; then
  printf "\n%bContainers with errors, won't get updated:%b\n" "$c_red" "$c_reset"
  printf "%s\n" "${GotErrors[@]}"
  printf "%binfo:%b 'unauthorized' often means not found in a public registry.\n" "$c_blue" "$c_reset"
fi
if [[ -n ${GotUpdates[*]} ]] ; then
   printf "\n%bContainers with updates available:%b\n" "$c_yellow" "$c_reset"
   [[ -z "$AutoUp" ]] && options || printf "%s\n" "${GotUpdates[@]}"
   [[ -n "$Notify" ]] && { [[ $(type -t send_notification) == function ]] && send_notification "${GotUpdates[@]}" || printf "Could not source notification function.\n" ; }
fi

# Optionally get updates if there's any
if [ -n "$GotUpdates" ] ; then
  if [ -z "$AutoUp" ] ; then
    printf "\n%bChoose what containers to update.%b\n" "$c_teal" "$c_reset"
    choosecontainers
  else
    SelectedUpdates=( "${GotUpdates[@]}" )
  fi
  if [ "$AutoUp" == "${AutoUp#[Nn]}" ] ; then
    NumberofUpdates="${#SelectedUpdates[@]}"
    CurrentQue=0
    for i in "${SelectedUpdates[@]}"
    do
      ((CurrentQue+=1))
      unset CompleteConfs
      # Extract labels and metadata
      ContLabels=$(docker inspect "$i" --format '{{json .Config.Labels}}')
      ContImage=$(docker inspect "$i" --format='{{.Config.Image}}')
      ContPath=$($jqbin -r '."com.docker.compose.project.working_dir"' <<< "$ContLabels")
      [ "$ContPath" == "null" ] && ContPath=""
      ContConfigFile=$($jqbin -r '."com.docker.compose.project.config_files"' <<< "$ContLabels")
      [ "$ContConfigFile" == "null" ] && ContConfigFile=""
      ContName=$($jqbin -r '."com.docker.compose.service"' <<< "$ContLabels")
      [ "$ContName" == "null" ] && ContName=""
      ContEnv=$($jqbin -r '."com.docker.compose.project.environment_file"' <<< "$ContLabels")
      [ "$ContEnv" == "null" ] && ContEnv=""
      ContUpdateLabel=$($jqbin -r '."mag37.dockcheck.update"' <<< "$ContLabels")
      [ "$ContUpdateLabel" == "null" ] && ContUpdateLabel=""
      ContRestartStack=$($jqbin -r '."mag37.dockcheck.restart-stack"' <<< "$ContLabels")
      [ "$ContRestartStack" == "null" ] && ContRestartStack=""

      # Checking if compose-values are empty - hence started with docker run
      if [ -z "$ContPath" ] ; then
        if [ "$DRunUp" == "yes" ] ; then
          docker pull "$ContImage"
          printf "%s\n" "$i got a new image downloaded, rebuild manually with preferred 'docker run'-parameters"
        else
          printf "\n%b%s%b has no compose labels, probably started with docker run - %bskipping%b\n\n" "$c_yellow" "$i" "$c_reset" "$c_yellow" "$c_reset"
        fi
        continue
      fi
      # cd to the compose-file directory to account for people who use relative volumes
      cd "$ContPath" || { echo "Path error - skipping $i" ; continue ; }
      ## Reformatting path + multi compose
      if [[ $ContConfigFile = '/'* ]] ; then
        CompleteConfs=$(for conf in ${ContConfigFile//,/ } ; do printf -- "-f %s " "$conf"; done)
      else
        CompleteConfs=$(for conf in ${ContConfigFile//,/ } ; do printf -- "-f %s/%s " "$ContPath" "$conf"; done)
      fi
      printf "\n%bNow updating (%s/%s): %b%s%b\n" "$c_teal" "$CurrentQue" "$NumberofUpdates" "$c_blue" "$i" "$c_reset"
      # Checking if Label Only -option is set, and if container got the label
      [[ "$OnlyLabel" == true ]] && { [[ "$ContUpdateLabel" != true ]] && { echo "No update label, skipping." ; continue ; } }
      docker pull "$ContImage"
      # Check if the container got an environment file set and reformat it
      if [ -n "$ContEnv" ]; then ContEnvs=$(for env in ${ContEnv//,/ } ; do printf -- "--env-file %s " "$env"; done) ; fi
      # Check if the whole stack should be restarted
      if [[ "$ContRestartStack" == true ]] || [[ "$ForceRestartStacks" == true ]] ; then
        $DockerBin ${CompleteConfs} stop ; $DockerBin ${CompleteConfs} ${ContEnvs} up -d
      else
        $DockerBin ${CompleteConfs} ${ContEnvs} up -d ${ContName}
      fi
    done
    printf "\n%bAll done!%b\n" "$c_green" "$c_reset"
    if [[ -z "$AutoPrune" ]] && [[ -z "$AutoUp" ]]; then read -r -p "Would you like to prune dangling images? y/[n]: " AutoPrune ; fi
    [[ "$AutoPrune" =~ [yY] ]] && docker image prune -f
  else
    printf "\nNo updates installed, exiting.\n"
  fi
else
  printf "\nNo updates available, exiting.\n"
fi

exit 0