angular-cn/dev-infra/release/versioning/active-release-trains.ts

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/**
* @license
* Copyright Google LLC All Rights Reserved.
*
* Use of this source code is governed by an MIT-style license that can be
* found in the LICENSE file at https://angular.io/license
*/
import * as semver from 'semver';
import {ReleaseTrain} from './release-trains';
import {getBranchesForMajorVersions, getVersionOfBranch, GithubRepoWithApi, VersionBranch} from './version-branches';
/** Interface describing determined active release trains for a project. */
export interface ActiveReleaseTrains {
/** Release-train currently in the "release-candidate" or "feature-freeze" phase. */
releaseCandidate: ReleaseTrain|null;
/** Release-train currently in the "latest" phase. */
latest: ReleaseTrain;
/** Release-train in the `next` phase. */
next: ReleaseTrain;
}
/** Branch name for the `next` branch. */
export const nextBranchName = 'master';
/** Fetches the active release trains for the configured project. */
export async function fetchActiveReleaseTrains(repo: GithubRepoWithApi):
Promise<ActiveReleaseTrains> {
const nextVersion = await getVersionOfBranch(repo, nextBranchName);
const next = new ReleaseTrain(nextBranchName, nextVersion);
const majorVersionsToConsider: number[] = [];
let expectedReleaseCandidateMajor: number;
// If the `next` branch (i.e. `master` branch) is for an upcoming major version, we know
// that there is no patch branch or feature-freeze/release-candidate branch for this major
// digit. If the current `next` version is the first minor of a major version, we know that
// the feature-freeze/release-candidate branch can only be the actual major branch. The
// patch branch is based on that, either the actual major branch or the last minor from the
// preceding major version. In all other cases, the patch branch and feature-freeze or
// release-candidate branch are part of the same major version. Consider the following:
//
// CASE 1. next: 11.0.0-next.0: patch and feature-freeze/release-candidate can only be
// most recent `10.<>.x` branches. The FF/RC branch can only be the last-minor of v10.
// CASE 2. next: 11.1.0-next.0: patch can be either `11.0.x` or last-minor in v10 based
// on whether there is a feature-freeze/release-candidate branch (=> `11.0.x`).
// CASE 3. next: 10.6.0-next.0: patch can be either `10.5.x` or `10.4.x` based on whether
// there is a feature-freeze/release-candidate branch (=> `10.5.x`)
if (nextVersion.minor === 0) {
expectedReleaseCandidateMajor = nextVersion.major - 1;
majorVersionsToConsider.push(nextVersion.major - 1);
} else if (nextVersion.minor === 1) {
expectedReleaseCandidateMajor = nextVersion.major;
majorVersionsToConsider.push(nextVersion.major, nextVersion.major - 1);
} else {
expectedReleaseCandidateMajor = nextVersion.major;
majorVersionsToConsider.push(nextVersion.major);
}
// Collect all version-branches that should be considered for the latest version-branch,
// or the feature-freeze/release-candidate.
const branches = (await getBranchesForMajorVersions(repo, majorVersionsToConsider));
const {latest, releaseCandidate} = await findActiveReleaseTrainsFromVersionBranches(
repo, nextVersion, branches, expectedReleaseCandidateMajor);
if (latest === null) {
throw Error(
`Unable to determine the latest release-train. The following branches ` +
`have been considered: [${branches.map(b => b.name).join(', ')}]`);
}
return {releaseCandidate, latest, next};
}
/** Finds the currently active release trains from the specified version branches. */
export async function findActiveReleaseTrainsFromVersionBranches(
repo: GithubRepoWithApi, nextVersion: semver.SemVer, branches: VersionBranch[],
expectedReleaseCandidateMajor: number): Promise<{
latest: ReleaseTrain | null,
releaseCandidate: ReleaseTrain | null,
}> {
// Version representing the release-train currently in the next phase. Note that we ignore
// patch and pre-release segments in order to be able to compare the next release train to
// other release trains from version branches (which follow the `N.N.x` pattern).
const nextReleaseTrainVersion = semver.parse(`${nextVersion.major}.${nextVersion.minor}.0`)!;
let latest: ReleaseTrain|null = null;
let releaseCandidate: ReleaseTrain|null = null;
// Iterate through the captured branches and find the latest non-prerelease branch and a
// potential release candidate branch. From the collected branches we iterate descending
// order (most recent semantic version-branch first). The first branch is either the latest
// active version branch (i.e. patch) or a feature-freeze/release-candidate branch. A FF/RC
// branch cannot be older than the latest active version-branch, so we stop iterating once
// we found such a branch. Otherwise, if we found a FF/RC branch, we continue looking for the
// next version-branch as that one is supposed to be the latest active version-branch. If it
// is not, then an error will be thrown due to two FF/RC branches existing at the same time.
for (const {name, parsed} of branches) {
// It can happen that version branches have been accidentally created which are more recent
// than the release-train in the next branch (i.e. `master`). We could ignore such branches
// silently, but it might be symptomatic for an outdated version in the `next` branch, or an
// accidentally created branch by the caretaker. In either way we want to raise awareness.
if (semver.gt(parsed, nextReleaseTrainVersion)) {
throw Error(
`Discovered unexpected version-branch "${name}" for a release-train that is ` +
`more recent than the release-train currently in the "${nextBranchName}" branch. ` +
`Please either delete the branch if created by accident, or update the outdated ` +
`version in the next branch (${nextBranchName}).`);
} else if (semver.eq(parsed, nextReleaseTrainVersion)) {
throw Error(
`Discovered unexpected version-branch "${name}" for a release-train that is already ` +
`active in the "${nextBranchName}" branch. Please either delete the branch if ` +
`created by accident, or update the version in the next branch (${nextBranchName}).`);
}
const version = await getVersionOfBranch(repo, name);
const releaseTrain = new ReleaseTrain(name, version);
const isPrerelease = version.prerelease[0] === 'rc' || version.prerelease[0] === 'next';
if (isPrerelease) {
if (releaseCandidate !== null) {
throw Error(
`Unable to determine latest release-train. Found two consecutive ` +
`branches in feature-freeze/release-candidate phase. Did not expect both "${name}" ` +
`and "${releaseCandidate.branchName}" to be in feature-freeze/release-candidate mode.`);
} else if (version.major !== expectedReleaseCandidateMajor) {
throw Error(
`Discovered unexpected old feature-freeze/release-candidate branch. Expected no ` +
`version-branch in feature-freeze/release-candidate mode for v${version.major}.`);
}
releaseCandidate = releaseTrain;
} else {
latest = releaseTrain;
break;
}
}
return {releaseCandidate, latest};
}