Find build by sha from ref

Adds ability to find builds by sha when only specifying a ref.

app/controllers/projects/artifacts_controller.rb

@@ -92,7 +92,10 @@ class Projects::ArtifactsController < Projects::ApplicationController
   def build_from_ref
     return unless @ref_name
 
-    project.latest_successful_build_for(params[:job], @ref_name)
+    commit = project.commit(@ref_name)
+    return unless commit
+
+    project.latest_successful_build_for_sha(params[:job], commit.id)
   end
 
   def artifacts_file

app/models/ci/pipeline.rb

@@ -230,9 +230,10 @@ module Ci
     # ref - The name (or names) of the branch(es)/tag(s) to limit the list of
     #       pipelines to.
     # limit - This limits a backlog search, default to 100.
-    def self.newest_first(ref: nil, limit: 100)
+    def self.newest_first(ref: nil, sha: nil, limit: 100)
       relation = order(id: :desc)
       relation = relation.where(ref: ref) if ref
+      relation = relation.where(sha: sha) if sha
 
       if limit
         ids = relation.limit(limit).select(:id)
@@ -252,6 +253,10 @@ module Ci
       newest_first(ref: ref).success.take
     end
 
+    def self.latest_successful_for_sha(sha)
+      newest_first(sha: sha).success.take
+    end
+
     def self.latest_successful_for_refs(refs)
       relation = newest_first(ref: refs).success
 

app/models/project.rb

@@ -719,14 +719,25 @@ class Project < ApplicationRecord
     repository.commits_by(oids: oids)
   end
 
-  # ref can't be HEAD, can only be branch/tag name or SHA
+  # ref can't be HEAD, can only be branch/tag name
   def latest_successful_build_for(job_name, ref = default_branch)
+    return unless ref
+
     latest_pipeline = ci_pipelines.latest_successful_for(ref)
     return unless latest_pipeline
 
     latest_pipeline.builds.latest.with_artifacts_archive.find_by(name: job_name)
   end
 
+  def latest_successful_build_for_sha(job_name, sha = commit(default_branch).id)
+    return unless sha
+
+    latest_pipeline = ci_pipelines.latest_successful_for_sha(sha)
+    return unless latest_pipeline
+
+    latest_pipeline.builds.latest.with_artifacts_archive.find_by(name: job_name)
+  end
+
   def latest_successful_build_for!(job_name, ref = default_branch)
     latest_successful_build_for(job_name, ref) || raise(ActiveRecord::RecordNotFound.new("Couldn't find job #{job_name}"))
   end

spec/features/projects/artifacts/user_downloads_artifacts_spec.rb

 require "spec_helper"
 
 describe "User downloads artifacts" do
-  set(:project) { create(:project, :public) }
-  set(:pipeline) { create(:ci_empty_pipeline, status: :success, project: project) }
+  set(:project) { create(:project, :repository, :public) }
+  set(:pipeline) { create(:ci_empty_pipeline, status: :success, sha: project.commit.id, project: project) }
   set(:job) { create(:ci_build, :artifacts, :success, pipeline: pipeline) }
 
   shared_examples "downloading" do