[SOLVED] How to list docker tags with date?

Issue

I need a list of all repository tags for a remote Docker registry, along with their date = the date the image tag was pushed.

Or at least the tags sorted according when they were created (without the date, but in chronological order).

What I have now (from the Official Docker docs) is:

curl -XGET -u my_user:my_pass 'https://my_registry.com/v2/my_repo/tags/list'

But that seems to return the tags in random order. I need to further filter / postprocess the tags programmatically, so I need to fetch additional per-tag metadata.

Any idea how to do that?

Solution

My two cents:

order_tags_by_date() {
    if [ -z $1 ] || [ -z $2 ]; then
        echo "Get tag list of a component and order by date. Please enter a component name and a tag "
        echo "For example: tags my-app 20200606"
        return 1
    fi
    # get all tags list
    url=some_host
    result=$(curl -s $url:5000/v2/$1/tags/list)
    # parse page and get "tags" array, sort by name, reverse, and get as a tab separated values; 
    # separate with space and put into an array in bash; 
    # "reverse" to get the latest tag first; if you want old tag first, remove it
    IFS=" " read -r -a tags <<< "$(echo $result | jq -r '.tags | sort | reverse | @tsv')"

    # for each tag, get the same component in docker api the manifest, 
    # parse the created field by the first element in history; I assume all histories has the same created timestamp
    json="["
    for tag in $tags
    do
        host=another-docker-api-host
        date=$(curl -sk $host/v2/$1/manifests/$tag | jq -r ".history[0].v1Compatibility" | jq ".created")
        json+='{"tag":"'$tag'", "date":'$date"},"
    done;
    valid_json=${json::-1}']'
    echo $valid_json | jq 'sort_by(.date, .tag) | reverse'
}

I constructed another JSON for jq to sort on the date, tag field. You can also remove "reverse" at the end to sort asc.

If you don't want the date, add this on the last line of the script, after reverse:

| .[] | .tag

So it will get all elements' tag value and they are already sorted.

jib created images, though, will have date of 1970-01-01, this is by design.

Answered By - WesternGun

Answer Checked By - Terry (WPSolving Volunteer)