feat: use git remote for branch related config

This will check the origin remote if it exists and use that to determine
which branches exist. These branches are then used to populate CI
branches, branch protections, and dependabot.

Using this for dependabot is a new feature which allows old release
branches to get dependency updates for template-oss only.

Fixes #329

.github/dependabot.yml

@@ -7,18 +7,7 @@ updates:
     directory: /
     schedule:
       interval: daily
-    allow:
-      - dependency-type: direct
-    versioning-strategy: increase-if-necessary
-    commit-message:
-      prefix: deps
-      prefix-development: chore
-    labels:
-      - "Dependencies"
-  - package-ecosystem: npm
-    directory: workspace/test-workspace/
-    schedule:
-      interval: daily
+    target-branch: "main"
     allow:
       - dependency-type: direct
     versioning-strategy: increase-if-necessary

.github/settings.yml

@@ -24,29 +24,3 @@ branches:
         apps: []
         users: []
         teams: [ "cli-team" ]
-  - name: latest
-    protection:
-      required_status_checks: null
-      enforce_admins: true
-      required_pull_request_reviews:
-        required_approving_review_count: 1
-        require_code_owner_reviews: true
-        require_last_push_approval: true
-        dismiss_stale_reviews: true
-      restrictions:
-        apps: []
-        users: []
-        teams: [ "cli-team" ]
-  - name: release/v*
-    protection:
-      required_status_checks: null
-      enforce_admins: true
-      required_pull_request_reviews:
-        required_approving_review_count: 1
-        require_code_owner_reviews: true
-        require_last_push_approval: true
-        dismiss_stale_reviews: true
-      restrictions:
-        apps: []
-        users: []
-        teams: [ "cli-team" ]

.github/workflows/ci-test-workspace.yml

@@ -10,8 +10,6 @@ on:
   push:
     branches:
       - main
-      - latest
-      - release/v*
     paths:
       - workspace/test-workspace/**
   schedule:

.github/workflows/ci.yml

@@ -10,8 +10,6 @@ on:
   push:
     branches:
       - main
-      - latest
-      - release/v*
     paths-ignore:
       - workspace/test-workspace/**
   schedule:

.github/workflows/codeql-analysis.yml

@@ -6,13 +6,9 @@ on:
   push:
     branches:
       - main
-      - latest
-      - release/v*
   pull_request:
     branches:
       - main
-      - latest
-      - release/v*
   schedule:
     # "At 10:00 UTC (03:00 PT) on Monday" https://crontab.guru/#0_10_*_*_1
     - cron: "0 10 * * 1"

.github/workflows/release.yml

@@ -11,8 +11,6 @@ on:
   push:
     branches:
       - main
-      - latest
-      - release/v*
 
 permissions:
   contents: write

lib/config.js

@@ -2,7 +2,8 @@ const { relative, dirname, join, extname, posix, win32 } = require('path')
 const { defaults, pick, omit, uniq } = require('lodash')
 const semver = require('semver')
 const parseCIVersions = require('./util/parse-ci-versions.js')
-const getGitUrl = require('./util/get-git-url.js')
+const parseDependabot = require('./util/dependabot.js')
+const git = require('./util/git.js')
 const gitignore = require('./util/gitignore.js')
 const { mergeWithArrays } = require('./util/merge.js')
 const { FILE_KEYS, parseConfig: parseFiles, getAddedFiles, mergeFiles } = require('./util/files.js')
@@ -153,6 +154,9 @@ const getFullConfig = async ({
   const publicPkgs = pkgs.filter(p => !p.pkgJson.private)
   const allPrivate = pkgs.every(p => p.pkgJson.private)
 
+  const branches = uniq([...pkgConfig.branches ?? [], pkgConfig.releaseBranch]).filter(Boolean)
+  const gitBranches = await git.getBranches(rootPkg.path, branches)
+
   // all derived keys
   const derived = {
     isRoot,
@@ -170,6 +174,12 @@ const getFullConfig = async ({
     allPrivate,
     // controls whether we are in a monorepo with any public workspaces
     isMonoPublic: isMono && !!publicPkgs.filter(p => p.path !== rootPkg.path).length,
+    // git
+    defaultBranch: await git.defaultBranch(rootPkg.path),
+    branches: gitBranches.branches,
+    branchPatterns: gitBranches.patterns,
+    // dependabot
+    dependabot: parseDependabot(pkgConfig, defaultConfig, gitBranches.branches),
     // repo
     repoDir: rootPkg.path,
     repoFiles,
@@ -261,7 +271,7 @@ const getFullConfig = async ({
     }
   }
 
-  const gitUrl = await getGitUrl(rootPkg.path)
+  const gitUrl = await git.getUrl(rootPkg.path)
   if (gitUrl) {
     derived.repository = {
       type: 'git',

lib/content/_on-ci.yml

@@ -12,7 +12,7 @@ pull_request:
   {{/if}}
 push:
   branches:
-    {{#each branches}}
+    {{#each branchPatterns}}
     - {{ . }}
     {{/each}}
   {{#if isWorkspace}}

lib/content/codeql-analysis.yml

@@ -3,12 +3,12 @@ name: CodeQL
 on:
   push:
     branches:
-      {{#each branches}}
+      {{#each branchPatterns}}
       - {{ . }}
       {{/each}}
   pull_request:
     branches:
-      {{#each branches}}
+      {{#each branchPatterns}}
       - {{ . }}
       {{/each}}
   schedule:

lib/content/dependabot.yml

@@ -1,15 +1,24 @@
 version: 2
 
 updates:
+  {{#each dependabot}}
   - package-ecosystem: npm
-    directory: {{ pkgDir }}
+    directory: /
     schedule:
       interval: daily
+    target-branch: "{{ branch }}"
     allow:
       - dependency-type: direct
-    versioning-strategy: {{ dependabot }}
+        {{#each allowNames }}
+        dependency-name: "{{ . }}"
+        {{/each}}
+    versioning-strategy: {{ strategy }}
     commit-message:
       prefix: deps
       prefix-development: chore
     labels:
       - "Dependencies"
+      {{#each labels }}
+      - "{{ . }}"
+      {{/each}}
+  {{/each}}

lib/content/index.js

@@ -38,14 +38,6 @@ const sharedRootAdd = (name) => ({
   '.github/dependabot.yml': {
     file: 'dependabot.yml',
     filter: (p) => p.config.dependabot,
-    clean: (p) => p.config.isRoot,
-    // dependabot takes a single top level config file. this parser
-    // will run for all configured packages and each one will have
-    // its item replaced in the updates array based on the directory
-    parser: (p) => class extends p.YmlMerge {
-      key = 'updates'
-      id = 'directory'
-    },
   },
   '.github/workflows/post-dependabot.yml': {
     file: 'post-dependabot.yml',
@@ -139,8 +131,8 @@ module.exports = {
   workspaceModule,
   windowsCI: true,
   macCI: true,
-  branches: ['main', 'latest', 'release/v*'],
-  defaultBranch: 'main',
+  branches: ['main', 'latest'],
+  releaseBranch: 'release/v*',
   distPaths: [
     'bin/',
     'lib/',

lib/content/release.yml

@@ -8,7 +8,7 @@ on:
         type: string
   push:
     branches:
-      {{#each branches}}
+      {{#each branchPatterns}}
       - {{ . }}
       {{/each}}
 

lib/util/dependabot.js

@@ -0,0 +1,28 @@
+const { name: NAME } = require('../../package.json')
+const { minimatch } = require('minimatch')
+
+const parseDependabotConfig = (v) => typeof v === 'string' ? { strategy: v } : (v ?? {})
+
+module.exports = (config, defaultConfig, branches) => {
+  const { dependabot } = config
+  const { dependabot: defaultDependabot } = defaultConfig
+
+  if (!dependabot) {
+    return false
+  }
+
+  return branches
+    .filter((b) => dependabot[b] !== false)
+    .map(branch => {
+      const isRelease = minimatch(branch, config.releaseBranch)
+
+      return {
+        branch,
+        allowNames: isRelease ? [NAME] : [],
+        labels: isRelease ? ['Backport', branch] : [],
+        ...parseDependabotConfig(defaultDependabot),
+        ...parseDependabotConfig(dependabot),
+        ...parseDependabotConfig(dependabot[branch]),
+      }
+    })
+}

lib/util/git.js

@@ -0,0 +1,74 @@
+const hgi = require('hosted-git-info')
+const git = require('@npmcli/git')
+const { minimatch } = require('minimatch')
+
+const cache = new Map()
+
+const tryGit = async (path, ...args) => {
+  if (!await git.is({ cwd: path })) {
+    throw new Error('no git')
+  }
+  const key = [path, ...args].join(',')
+  if (cache.has(key)) {
+    return cache.get(key)
+  }
+  const res = git.spawn(args, { cwd: path }).then(r => r.stdout.trim())
+  cache.set(key, res)
+  return res
+}
+
+// parse a repo from a git origin into a format
+// for a package.json#repository object
+const getUrl = async (path) => {
+  try {
+    const urlStr = await tryGit(path, 'remote', 'get-url', 'origin')
+    const { domain, user, project } = hgi.fromUrl(urlStr)
+    const url = new URL(`https://${domain}`)
+    url.pathname = `/${user}/${project}.git`
+    return url.toString()
+  } catch {
+    // errors are ignored
+  }
+}
+
+const getBranches = async (path, branchPatterns) => {
+  let matchingBranches = new Set()
+  let matchingPatterns = new Set()
+
+  try {
+    const res = await tryGit(path, 'ls-remote', '--heads', 'origin').then(r => r.split('\n'))
+    const remotes = res.map((h) => h.match(/refs\/heads\/(.*)$/)).filter(Boolean).map(h => h[1])
+    for (const branch of remotes) {
+      for (const pattern of branchPatterns) {
+        if (minimatch(branch, pattern)) {
+          matchingBranches.add(branch)
+          matchingPatterns.add(pattern)
+        }
+      }
+    }
+  } catch {
+    matchingBranches = new Set(branchPatterns.filter(b => !b.includes('*')))
+    matchingPatterns = new Set(branchPatterns)
+  }
+
+  return {
+    branches: [...matchingBranches],
+    patterns: [...matchingPatterns],
+  }
+}
+
+const defaultBranch = async (path) => {
+  try {
+    const remotes = await tryGit(path, 'remote', 'show', 'origin')
+    const branch = remotes.match(/HEAD branch: (.*)$/m)
+    return branch[1]
+  } catch {
+    return 'main'
+  }
+}
+
+module.exports = {
+  getUrl,
+  getBranches,
+  defaultBranch,
+}