Docker

Image Reference Parser

Break an image reference into registry, repository, tag and digest, and see which defaults were implied.

Image reference

Reference

[registry[:port]/][namespace/]name[:tag][@digest]

Components

Registry: ghcr.io
Repository: owner/repo
Namespace: owner
Name: repo
Tag: 1.2.3
Digest: —

Fully qualified

ghcr.io/owner/repo:1.2.3

Every default made explicit. A single-component name on Docker Hub resolves under the library namespace.

Tag

semver

Raw: 1.2.3
Prefix: —
Major: 1
Minor: 2
Patch: 3
Suffix: —

Review

Examples

The parsing rules here match github.com/distribution/reference, the library Docker itself uses — including the awkward case where an uppercase first component is read as a registry host rather than a namespace.