dockertags

#!/bin/bash
# 2017-03-27 charles@mims.io


if [ $# -lt 1 ]
then
cat << HELP

dockertags  --  list all tags for a Docker image

EXAMPLE:
    - list all tags for charlesmims/alps
       dockertags charlesmims/alps


HELP
exit 1
fi



if ! [ -x "$(command -v jq)" ]; then
	echo 'apt-get install jq' >&2
	exit 1
fi

if [ -z ${UNAME+x} ]; then
	echo -n "Docker Username: "
	read "UNAME"
fi

if [ -z ${UPASS+x} ]; then
	echo -n "Docker Password: "
	read -s "UPASS"
fi




getToken() {
    local reponame=$1
    local actions=$2
    local headers
    local response

    if [ -n "$UNAME" ]; then
        headers="Authorization: Basic $(echo -n "${UNAME}:${UPASS}" | base64)"
    fi

    response=$(curl -s -H "$headers" "https://auth.docker.io/token?service=registry.docker.io&scope=repository:$reponame:$actions")

    echo $response | jq '.token' | xargs echo
}


getTags() {
    local reponame=$1
    local token=$(getToken $reponame "pull")
    curl -sH "Authorization: Bearer $token" "https://registry-1.docker.io/v2/$reponame/tags/list" | jq -c '.tags'
}

getTags $1