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refactor(dev-infra): expose logic for dealing with LTS branches (#38656) 

Exposes logic for dealing with LTS branches, so that the release
tool can re-use it for cutting LTS patch releases.

Eventually, we can move all of this logic to a more dedicated
folder instead of having it inside the merge folder.

PR Close #38656
This commit is contained in:
Paul Gschwendtner 2020-09-01 19:48:03 +02:00 committed by Alex Rickabaugh
parent d7ff8d765c
commit c1b47bcfaa
1 changed files with 27 additions and 9 deletions
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36
dev-infra/pr/merge/defaults/lts-branch.ts
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@ -18,13 +18,16 @@ import {getVersionOfBranch, GithubRepoWithApi} from './branches';
* Number of months a major version in Angular is actively supported. See:
* https://angular.io/guide/releases#support-policy-and-schedule.
*/
const majorActiveSupportDuration = 6;
export const majorActiveSupportDuration = 6;
/**
* Number of months a major version has active long-term support. See:
* https://angular.io/guide/releases#support-policy-and-schedule.
*/
const majorActiveTermSupportDuration = 12;
export const majorActiveTermSupportDuration = 12;
/** Regular expression that matches LTS NPM dist tags. */
export const ltsNpmDistTagRegex = /^v(\d+)-lts$/;
/**
* Asserts that the given branch corresponds to an active LTS version-branch that can receive
@ -45,7 +48,8 @@ export async function assertActiveLtsBranch(
await (await fetch(`https://registry.npmjs.org/${representativeNpmPackage}`)).json();
// LTS versions should be tagged in NPM in the following format: `v{major}-lts`.
const ltsVersion = semver.parse(distTags[`v${version.major}-lts`]);
const ltsNpmTag = getLtsNpmDistTagOfMajor(version.major);
const ltsVersion = semver.parse(distTags[ltsNpmTag]);
// Ensure that there is a LTS version tagged for the given version-branch major. e.g.
// if the version branch is `9.2.x` then we want to make sure that there is a LTS
@ -63,12 +67,8 @@ export async function assertActiveLtsBranch(
}
const today = new Date();
const releaseDate = new Date(time[`${version.major}.0.0`]);
const ltsEndDate = new Date(
releaseDate.getFullYear(),
releaseDate.getMonth() + majorActiveSupportDuration + majorActiveTermSupportDuration,
releaseDate.getDate(), releaseDate.getHours(), releaseDate.getMinutes(),
releaseDate.getSeconds(), releaseDate.getMilliseconds());
const majorReleaseDate = new Date(time[`${version.major}.0.0`]);
const ltsEndDate = computeLtsEndDateOfMajor(majorReleaseDate);
// Check if LTS has already expired for the targeted major version. If so, we do not
// allow the merge as per our LTS guarantees. Can be forcibly overridden if desired.
@ -87,3 +87,21 @@ export async function assertActiveLtsBranch(
`Pull request cannot be merged into the ${branchName} branch.`);
}
}
/**
* Computes the date when long-term support ends for a major released at the
* specified date.
*/
export function computeLtsEndDateOfMajor(majorReleaseDate: Date): Date {
return new Date(
majorReleaseDate.getFullYear(),
majorReleaseDate.getMonth() + majorActiveSupportDuration + majorActiveTermSupportDuration,
majorReleaseDate.getDate(), majorReleaseDate.getHours(), majorReleaseDate.getMinutes(),
majorReleaseDate.getSeconds(), majorReleaseDate.getMilliseconds());
}
/** Gets the long-term support NPM dist tag for a given major version. */
export function getLtsNpmDistTagOfMajor(major: number): string {
// LTS versions should be tagged in NPM in the following format: `v{major}-lts`.
return `v${major}-lts`;
}