@swimlane/docker-reference
v2.0.1
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A node.js package to parse docker image reference
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Docker-Reference
A small package to parse and work with docker images references.
Getting started
To use docker-reference you should start with creating a Reference
instance:
const { Reference } = require('@swimlane/docker-reference');
const imageReference = new Reference({
domain: 'r.cfcr.io',
repository: 'codefresh/demochat',
tag: 'master',
digest: 'sha256:58fe87ff24d5a3ac35c887dcef82eb619565987c1083282f876c7c2657a5f94e'
});
console.log(imageReference.repositoryUrl); // r.cfcr.io/codefresh/demochat
console.log(imageReference.toString()); // r.cfcr.io/codefresh/demochat:master@sha256:58fe87ff24d5a3ac35c887dcef82eb619565987c1083282f876c7c2657a5f94e
Using parsers
You can also use parser to create your Reference
instance:
const { parseQualifiedName } = require('@swimlane/docker-reference');
const imageReference = parseQualifiedName('r.cfcr.io/codefresh/demochat:master@sha256:58fe87ff24d5a3ac35c887dcef82eb619565987c1083282f876c7c2657a5f94e');
console.log(imageReference.domain); // r.cfcr.io
console.log(imageReference.repository); // codefresh/demochat
console.log(imageReference.tag); // master
console.log(imageReference.digest); // sha256:58fe87ff24d5a3ac35c887dcef82eb619565987c1083282f876c7c2657a5f94e
There are 3 parsers in the package:
parseQualifiedName
:This should be use when parsing a string representing a qualified image reference, meaning the string should contain at least the domain and the repository of the image.
parseFamiliarName
:This should be use when parsing a string representing a familiar image reference, meaning the string might not contains the domain part and this case the domain part would become
docker.io
. Also when the domain is missing and the repository contains only one part the repository would be prefixed withlibrary/
.This parser would parse all qualified image reference the same as
parseQualifiedName
parserparseAll
:This should be use when parsing a string representing a familiar image reference or identifier.
This parser would parse all qualified image reference the same as
parseQualifiedName
parser and parse every familiar image reference the same asparseFamiliarName
Grammer for the package
| | pattaren |
| --- | --- |
| reference
| name [ ":" tag ] [ "@" digest ]
|
| name
| [domain '/'] path-component ['/' path-component]*
|
| domain
| domain-component ['.' domain-component]* [':' port-number]
|
| domain-component
| /([a-zA-Z0-9]|[a-zA-Z0-9][a-zA-Z0-9-]*[a-zA-Z0-9])/
|
| port-number
| /[0-9]+/
|
| path-component
| alpha-numeric [separator alpha-numeric]*
|
| alpha-numeric
| /[a-z0-9]+/
|
| separator
| /[_.]|__|[-]*/
|
| tag
| /[\w][\w.-]{0,127}/
|
| digest
| digest-algorithm ":" digest-hex
|
| digest-algorithm
| digest-algorithm-component [ digest-algorithm-separator digest-algorithm-component ]*
|
| digest-algorithm-separator
| /[+.-_]/
|
| digest-algorithm-component
| /[A-Za-z][A-Za-z0-9]*/
|
| digest-hex
| /[0-9a-fA-F]{32,}/
(At least 128 bit digest value) |
| identifier
| /[a-f0-9]{64}/
|
| short-identifier
| /[a-f0-9]{6,64}/
|