fix: full sync all app installations, not just the first

index.js

@@ -231,20 +231,44 @@ module.exports = (robot, { getRouter }, Settings = require('./lib/settings')) =>
       github.rest.apps.listInstallations.endpoint.merge({ per_page: 100 })
     )
 
-    if (installations.length > 0) {
-      const installation = installations[0]
-      const github = await robot.auth(installation.id)
-      const context = {
-        payload: {
-          installation
-        },
-        octokit: github,
-        log: robot.log,
-        repo: () => { return { repo: env.ADMIN_REPO, owner: installation.account.login } }
+    if (installations.length === 0) {
+      return null
+    }
+
+    // Sync every installation. A single failing installation must not prevent
+    // the remaining ones from being synced, so each iteration is isolated and
+    // its error is collected instead of thrown.
+    const results = []
+    const errors = []
+    let failed = 0
+
+    for (const installation of installations) {
+      try {
+        const owner = installation.account.login
+        robot.log.debug(`Syncing installation ${installation.id} for ${owner}`)
+        const github = await robot.auth(installation.id)
+        const context = {
+          payload: {
+            installation
+          },
+          octokit: github,
+          log: robot.log,
+          repo: () => { return { repo: env.ADMIN_REPO, owner } }
+        }
+        const result = await syncAllSettings(nop, context)
+        results.push(result)
+        if (result?.errors?.length) {
+          errors.push(...result.errors)
+        }
+      } catch (e) {
+        failed++
+        robot.log.error(`Failed to sync installation ${installation.id} for ${installation.account?.login}: ${e}`)
+        errors.push(e)
       }
-      return syncAllSettings(nop, context)
     }
-    return null
+
+    robot.log.info(`Synced ${installations.length - failed} of ${installations.length} installation(s); ${failed} failed`)
+    return { results, errors }
   }
 
   robot.on('push', async context => {

test/unit/sync-installation.test.js

@@ -0,0 +1,141 @@
+const plugin = require('../../index')
+
+// The runtime config is fetched from the admin repo over the API. The
+// installation fan-out under test does not depend on its contents.
+jest.mock('../../lib/configManager', () => {
+  return class ConfigManager {
+    async loadGlobalSettingsYaml () {
+      return {}
+    }
+  }
+})
+
+describe('syncInstallation', () => {
+  let robot, Settings, installations
+
+  const installation = (id, login) => ({ id, account: { login } })
+
+  const createOctokit = () => ({
+    paginate: jest.fn(() => Promise.resolve(installations)),
+    rest: {
+      apps: {
+        listInstallations: { endpoint: { merge: jest.fn(() => ({})) } },
+        getAuthenticated: jest.fn(() => Promise.resolve({ data: { slug: 'safe-settings' } }))
+      }
+    }
+  })
+
+  const createApp = () => plugin(robot, {}, Settings)
+
+  beforeEach(() => {
+    installations = []
+    Settings = { syncAll: jest.fn(() => Promise.resolve({ errors: [] })) }
+    robot = {
+      on: jest.fn(),
+      auth: jest.fn(() => Promise.resolve(createOctokit())),
+      log: {
+        trace: jest.fn(),
+        debug: jest.fn(),
+        info: jest.fn(),
+        error: jest.fn()
+      }
+    }
+  })
+
+  describe('with multiple installations', () => {
+    beforeEach(() => {
+      installations = [installation(1, 'org-one'), installation(2, 'org-two')]
+    })
+
+    it('syncs every installation with its own owner', async () => {
+      const app = createApp()
+
+      const result = await app.syncInstallation()
+
+      expect(Settings.syncAll).toHaveBeenCalledTimes(2)
+      expect(Settings.syncAll.mock.calls.map(call => call[2])).toEqual([
+        { repo: 'admin', owner: 'org-one' },
+        { repo: 'admin', owner: 'org-two' }
+      ])
+      expect(result.results).toHaveLength(2)
+      expect(result.errors).toEqual([])
+    })
+
+    it('passes the nop flag through to every installation', async () => {
+      const app = createApp()
+
+      await app.syncInstallation(true)
+
+      expect(Settings.syncAll.mock.calls.map(call => call[0])).toEqual([true, true])
+    })
+
+    it('logs a single summary of the sync', async () => {
+      const app = createApp()
+
+      await app.syncInstallation()
+
+      expect(robot.log.info).toHaveBeenCalledTimes(1)
+      expect(robot.log.info).toHaveBeenCalledWith(expect.stringContaining('Synced 2 of 2 installation(s); 0 failed'))
+    })
+
+    it('aggregates errors reported by the individual syncs', async () => {
+      Settings.syncAll
+        .mockResolvedValueOnce({ errors: ['boom'] })
+        .mockResolvedValueOnce({ errors: [] })
+      const app = createApp()
+
+      const result = await app.syncInstallation()
+
+      expect(result.errors).toEqual(['boom'])
+    })
+  })
+
+  describe('when an installation fails', () => {
+    const failure = new Error('installation is suspended')
+
+    beforeEach(() => {
+      installations = [installation(1, 'org-one'), installation(2, 'org-two')]
+      Settings.syncAll
+        .mockRejectedValueOnce(failure)
+        .mockResolvedValueOnce({ errors: [] })
+    })
+
+    it('still syncs the remaining installations', async () => {
+      const app = createApp()
+
+      await app.syncInstallation()
+
+      expect(Settings.syncAll).toHaveBeenCalledTimes(2)
+      expect(Settings.syncAll.mock.calls[1][2]).toEqual({ repo: 'admin', owner: 'org-two' })
+    })
+
+    it('surfaces the failure in the returned errors', async () => {
+      const app = createApp()
+
+      const result = await app.syncInstallation()
+
+      expect(result.errors).toEqual([failure])
+      expect(result.results).toHaveLength(1)
+    })
+
+    it('logs the failing installation id and account', async () => {
+      const app = createApp()
+
+      await app.syncInstallation()
+
+      expect(robot.log.error).toHaveBeenCalledWith(expect.stringContaining('installation 1 for org-one'))
+      expect(robot.log.info).toHaveBeenCalledWith(expect.stringContaining('Synced 1 of 2 installation(s); 1 failed'))
+    })
+  })
+
+  describe('without any installation', () => {
+    it('returns null and does not sync', async () => {
+      const app = createApp()
+
+      const result = await app.syncInstallation()
+
+      expect(result).toBeNull()
+      expect(Settings.syncAll).not.toHaveBeenCalled()
+    })
+  })
+})