Let the CI runner know about builds that this build depends on

This allows us to implement artifacts passing: runner will download artifacts from all prior builds

CHANGELOG

@@ -20,6 +20,7 @@ v 8.4.0 (unreleased)
   - Don't notify users twice if they are both project watchers and subscribers (Stan Hu)
   - Implement new UI for group page
   - Implement search inside emoji picker
+  - Let the CI runner know about builds that this build depends on
   - Add API support for looking up a user by username (Stan Hu)
   - Add project permissions to all project API endpoints (Stan Hu)
   - Link to milestone in "Milestone changed" system note

app/models/ci/build.rb

@@ -128,6 +128,14 @@ module Ci
       !self.commit.latest_builds_for_ref(self.ref).include?(self)
     end
+    def depends_on_builds
+      # Get builds of the same type
+      latest_builds = self.commit.builds.similar(self).latest
+
+      # Return builds from previous stages
+      latest_builds.where('stage_idx < ?', stage_idx)
+    end
+
     def trace_html
       html = Ci::Ansi2html::convert(trace) if trace.present?
       html || ''

app/uploaders/artifact_uploader.rb

@@ -32,6 +32,10 @@ class ArtifactUploader < CarrierWave::Uploader::Base
     self.class.storage == CarrierWave::Storage::File
   end
+  def filename
+    file.try(:filename)
+  end
+
   def exists?
     file.try(:exists?)
   end

doc/ci/api/builds.md

@@ -18,18 +18,64 @@ Returns:
 ```json
 {
-  "id" : 79,
-  "commands" : "",
-  "path" : "",
-  "ref" : "",
-  "sha" : "",
-  "project_id" : 6,
-  "repo_url" : "git@demo.gitlab.com:gitlab/gitlab-shell.git",
-  "before_sha" : ""
+  "id": 48584,
+  "ref": "0.1.1",
+  "tag": true,
+  "sha": "d63117656af6ff57d99e50cc270f854691f335ad",
+  "status": "success",
+  "name": "pages",
+  "token": "9dd60b4f1a439d1765357446c1084c",
+  "stage": "test",
+  "project_id": 479,
+  "project_name": "test",
+  "commands": "echo commands",
+  "repo_url": "http://gitlab-ci-token:token@gitlab.example/group/test.git",
+  "before_sha": "0000000000000000000000000000000000000000",
+  "allow_git_fetch": false,
+  "options": {
+    "image": "docker:image",
+    "artifacts": {
+      "paths": [
+        "public"
+      ]
+    },
+    "cache": {
+      "paths": [
+        "vendor"
+      ]
+    }
+  },
+  "timeout": 3600,
+  "variables": [
+    {
+      "key": "CI_BUILD_TAG",
+      "value": "0.1.1",
+      "public": true
+    }
+  ],
+  "dependencies": {
+    "builds": [
+      {
+        "id": 48584,
+        "ref": "0.1.1",
+        "tag": true,
+        "sha": "d63117656af6ff57d99e50cc270f854691f335ad",
+        "status": "success",
+        "name": "build",
+        "token": "9dd60b4f1a439d1765357446c1084c",
+        "stage": "build",
+        "project_id": 479,
+        "project_name": "test",
+        "artifacts_file": {
+          "filename": "artifacts.zip",
+          "size": 0
+        }
+      }
+    ]
+  }
 }
 ```
-
 ### Update details of an existing build
     PUT /ci/builds/:id

lib/ci/api/builds.rb

@@ -20,7 +20,7 @@ module Ci
           if build
             update_runner_info
-            present build, with: Entities::Build
+            present build, with: Entities::BuildDetails
           else
             not_found!
           end
@@ -111,7 +111,7 @@ module Ci
           build.artifacts_metadata = metadata
           if build.save
-            present(build, with: Entities::Build)
+            present(build, with: Entities::BuildDetails)
           else
             render_validation_error!(build)
           end

lib/ci/api/entities.rb

@@ -16,10 +16,19 @@ module Ci
       end
       class Build < Grape::Entity
-        expose :id, :commands, :ref, :sha, :status, :project_id, :repo_url,
-          :before_sha, :allow_git_fetch, :project_name
-
+        expose :id, :ref, :tag, :sha, :status
         expose :name, :token, :stage
+        expose :project_id
+        expose :project_name
+        expose :artifacts_file, using: ArtifactFile, if: lambda { |build, opts| build.artifacts_file.exists? }
+      end
+
+      class BuildDetails < Build
+        expose :commands
+        expose :repo_url
+        expose :before_sha
+        expose :allow_git_fetch
+        expose :token
         expose :options do |model|
           model.options
@@ -30,7 +39,9 @@ module Ci
         end
         expose :variables
-        expose :artifacts_file, using: ArtifactFile
+        expose :dependencies do
+          expose :depends_on_builds, as: :builds, using: Build
+        end
       end
       class Runner < Grape::Entity

spec/models/build_spec.rb

@@ -426,6 +426,30 @@ describe Ci::Build, models: true do
     it { is_expected.to include(project.web_url[7..-1]) }
   end
+  describe :depends_on_builds do
+    let!(:build) { FactoryGirl.create :ci_build, commit: commit, name: 'build', stage_idx: 0, stage: 'build' }
+    let!(:rspec_test) { FactoryGirl.create :ci_build, commit: commit, name: 'rspec', stage_idx: 1, stage: 'test' }
+    let!(:rubocop_test) { FactoryGirl.create :ci_build, commit: commit, name: 'rubocop', stage_idx: 1, stage: 'test' }
+    let!(:staging) { FactoryGirl.create :ci_build, commit: commit, name: 'staging', stage_idx: 2, stage: 'deploy' }
+
+    it 'to have no dependents if this is first build' do
+      expect(build.depends_on_builds).to be_empty
+    end
+
+    it 'to have one dependent if this is test' do
+      expect(rspec_test.depends_on_builds.map(&:id)).to contain_exactly(build.id)
+    end
+
+    it 'to have all builds from build and test stage if this is last' do
+      expect(staging.depends_on_builds.map(&:id)).to contain_exactly(build.id, rspec_test.id, rubocop_test.id)
+    end
+
+    it 'to have retried builds instead the original ones' do
+      retried_rspec = Ci::Build.retry(rspec_test)
+      expect(staging.depends_on_builds.map(&:id)).to contain_exactly(build.id, retried_rspec.id, rubocop_test.id)
+    end
+  end
+
   def create_mr(build, commit, factory: :merge_request, created_at: Time.now)
     FactoryGirl.create(factory,
                        source_project_id: commit.gl_project_id,

spec/requests/ci/api/builds_spec.rb

@@ -101,6 +101,18 @@ describe Ci::API::API do
           { "key" => "TRIGGER_KEY", "value" => "TRIGGER_VALUE", "public" => false },
         ])
       end
+
+      it "returns dependent builds" do
+        commit = FactoryGirl.create(:ci_commit, project: project)
+        commit.create_builds('master', false, nil, nil)
+        commit.builds.where(stage: 'test').each(&:success)
+
+        post ci_api("/builds/register"), token: runner.token, info: { platform: :darwin }
+
+        expect(response.status).to eq(201)
+        expect(json_response["dependencies"]["builds"].count).to eq(2)
+        expect(json_response["dependencies"]["builds"][0]["name"]).to eq("rspec")
+      end
     end
     describe "PUT /builds/:id" do

spec/support/gitlab_stubs/gitlab_ci.yml

@@ -36,8 +36,8 @@ staging:
   script: "cap deploy stating"
   type: deploy
   tags: 
-    - capistrano
-    - debian
+    - ruby
+    - mysql
   except:
     - stable
@@ -47,8 +47,8 @@ production:
     - cap deploy production
     - cap notify
   tags: 
-    - capistrano
-    - debian
+    - ruby
+    - mysql
   only:
     - master
     - /^deploy-.*$/