Refuse merge until all required status checks success (#7481)

* refuse merge until ci successfully

* deny merge request when required status checkes not succeed on merge Post and API

* add database migration for added columns on protected_branch

* fix migration

* fix protected branch check bug

* fix protected branch settings

* remove duplicated code on check pull request's required commit statuses pass

* remove unused codes

* fix migration

* add newline for template file

* fix go mod

* rename function name and some other fixes

* fix template

* fix bug pull view

* remove go1.12 wrong dependencies

* add administrator bypass when protected branch status check enabled

* fix bug

* improve the codes

modules/auth/repo_form.go

@@ -155,6 +155,8 @@ type ProtectBranchForm struct {
 	EnableMergeWhitelist    bool
 	MergeWhitelistUsers     string
 	MergeWhitelistTeams     string
+	EnableStatusCheck       bool `xorm:"NOT NULL DEFAULT false"`
+	StatusCheckContexts     []string
 	RequiredApprovals       int64
 	ApprovalsWhitelistUsers string
 	ApprovalsWhitelistTeams string

modules/pull/commit_status.go

@@ -0,0 +1,70 @@
+// Copyright 2019 The Gitea Authors.
+// All rights reserved.
+// Use of this source code is governed by a MIT-style
+// license that can be found in the LICENSE file.
+
+package pull
+
+import (
+	"code.gitea.io/gitea/models"
+	"code.gitea.io/gitea/modules/git"
+
+	"github.com/pkg/errors"
+)
+
+// IsCommitStatusContextSuccess returns true if all required status check contexts succeed.
+func IsCommitStatusContextSuccess(commitStatuses []*models.CommitStatus, requiredContexts []string) bool {
+	for _, ctx := range requiredContexts {
+		var found bool
+		for _, commitStatus := range commitStatuses {
+			if commitStatus.Context == ctx {
+				if commitStatus.State != models.CommitStatusSuccess {
+					return false
+				}
+
+				found = true
+				break
+			}
+		}
+		if !found {
+			return false
+		}
+	}
+	return true
+}
+
+// IsPullCommitStatusPass returns if all required status checks PASS
+func IsPullCommitStatusPass(pr *models.PullRequest) (bool, error) {
+	if err := pr.LoadProtectedBranch(); err != nil {
+		return false, errors.Wrap(err, "GetLatestCommitStatus")
+	}
+	if pr.ProtectedBranch == nil || !pr.ProtectedBranch.EnableStatusCheck {
+		return true, nil
+	}
+
+	// check if all required status checks are successful
+	headGitRepo, err := git.OpenRepository(pr.HeadRepo.RepoPath())
+	if err != nil {
+		return false, errors.Wrap(err, "OpenRepository")
+	}
+
+	if !headGitRepo.IsBranchExist(pr.HeadBranch) {
+		return false, errors.New("Head branch does not exist, can not merge")
+	}
+
+	sha, err := headGitRepo.GetBranchCommitID(pr.HeadBranch)
+	if err != nil {
+		return false, errors.Wrap(err, "GetBranchCommitID")
+	}
+
+	if err := pr.LoadBaseRepo(); err != nil {
+		return false, errors.Wrap(err, "LoadBaseRepo")
+	}
+
+	commitStatuses, err := models.GetLatestCommitStatus(pr.BaseRepo, sha, 0)
+	if err != nil {
+		return false, errors.Wrap(err, "GetLatestCommitStatus")
+	}
+
+	return IsCommitStatusContextSuccess(commitStatuses, pr.ProtectedBranch.StatusCheckContexts), nil
+}