CLI tool to interact with private docker registries

registrycli

#!/bin/bash

# requirements:
#   brew install gawk gsed

# settings file ~/.registry_settings
#   REGISTRY="registry.acme.com"
#   URL="https://${REGISTRY}:5000/v1"
#   USERNAME="admin"
#   PASSWORD="password"

source ~/.registry_settings

ACTION=$1
AUTH="${USERNAME}:${PASSWORD}"

function _usage() {
  echo "$0 - interact with docker registry (${REGISTRY})"
  echo "Commands:"
  echo "  env                    # prints script environment vars"
  echo "  images                 # lists all images"
  echo "  tags image_name        # lists all tags for an image"
  echo "  info image_name [tag]  # prints image/tag info"
  echo "  pull image_name [tag]  # pulls an image via docker cli (default tag: latest)"
  exit
}

function _error() {
  echo "[!] ERROR: ${1}"
  exit 1
}

function _curl_json() {
  local url=$1
  [ -z $url ] && _error "Must pass a URL to func _curl_json"
  curl --silent -u $AUTH $url | python -m json.tool
}

function _env() {
  echo "Registry: ${REGISTRY}"
  echo "Base URL: ${URL}"
  echo "Username: ${USERNAME}"
}

function _images() {
  _curl_json ${URL}/search \
    | awk '/name/ { print $2 }' \
    | gsed -r 's/(["\/]|library)//g'
}

function _tags() {
  local image=$1
  [ -z $image ] && _error "Must pass an image to tags command"
  _curl_json ${URL}/repositories/${image}/tags \
    | gsed -r 's/[\{\}",]//g' \
    | gsed -r 's/^[ ]+//g'
}

function _info() {
  local image=$1
  local tag=$2
  local req="${image}/json"
  [ -z $image ] && _error "Must pass an image to info command"
  [ -z $tag ] || req="${image}/tags/${tag}/json"
  _curl_json ${URL}/repositories/${req} \
    | gsed -r 's/[\{\}",]//g' \
    | gsed -r 's/^[ ]+//g' \
    | gawk '{if ($2 ~ /[0-9]{10}/) {{$2=strftime("%c",$2)} {print "last_update:",$2}} else {print}}'
}

function _pull() {
  local image=$1
  local tag=${2:-latest}
  [ -z $image ] && _error "Must pass an image to pull command"
  docker pull ${REGISTRY}/${image}:${tag}
}

[ -z $1 ] && _usage

while ! [ -z $1 ]; do
  case $1 in
    env)    _env;;
    images) _images;;
    tags)   shift; _tags $1;;
    info)   shift; i=$1; shift; t=$1; _info $i $t;;
    pull)   shift; i=$1; shift; t=$1; _pull $i $t;;
    *)      _usage;;
  esac
  shift
done