Disallow merge when required checked are missing (#29143)

fixes #21892 

This PR disallows merging a PR when not all commit status contexts
configured in the branch protection are met.

Previously, the PR was happy to merge when one commit status was
successful and the other contexts weren't reported.

Any feedback is welcome, first time Go :-)
I'm also not sure if the changes in the template break something else

Given the following branch protection:


![branch_protection](https://github.com/go-gitea/gitea/assets/2401875/f871b4e4-138b-435a-b496-f9ad432e3dec)

This was shown before the change:


![before](https://github.com/go-gitea/gitea/assets/2401875/60424ff0-ee09-4fa0-856e-64e6e3fb0612)

With the change, it is now shown as this:


![after](https://github.com/go-gitea/gitea/assets/2401875/4e464142-efb1-4889-8166-eb3be26c8f3d)

---------

Co-authored-by: wxiaoguang <wxiaoguang@gmail.com>

routers/web/repo/pull.go

@@ -652,6 +652,24 @@ func PrepareViewPullInfo(ctx *context.Context, issue *issues_model.Issue) *git.C
 	}
 
 	if pb != nil && pb.EnableStatusCheck {
+
+		var missingRequiredChecks []string
+		for _, requiredContext := range pb.StatusCheckContexts {
+			contextFound := false
+			matchesRequiredContext := createRequiredContextMatcher(requiredContext)
+			for _, presentStatus := range commitStatuses {
+				if matchesRequiredContext(presentStatus.Context) {
+					contextFound = true
+					break
+				}
+			}
+
+			if !contextFound {
+				missingRequiredChecks = append(missingRequiredChecks, requiredContext)
+			}
+		}
+		ctx.Data["MissingRequiredChecks"] = missingRequiredChecks
+
 		ctx.Data["is_context_required"] = func(context string) bool {
 			for _, c := range pb.StatusCheckContexts {
 				if c == context {
@@ -720,6 +738,18 @@ func PrepareViewPullInfo(ctx *context.Context, issue *issues_model.Issue) *git.C
 	return compareInfo
 }
 
+func createRequiredContextMatcher(requiredContext string) func(string) bool {
+	if gp, err := glob.Compile(requiredContext); err == nil {
+		return func(contextToCheck string) bool {
+			return gp.Match(contextToCheck)
+		}
+	}
+
+	return func(contextToCheck string) bool {
+		return requiredContext == contextToCheck
+	}
+}
+
 type pullCommitList struct {
 	Commits             []pull_service.CommitInfo `json:"commits"`
 	LastReviewCommitSha string                    `json:"last_review_commit_sha"`

services/pull/commit_status.go

@@ -51,6 +51,10 @@ func MergeRequiredContextsCommitStatus(commitStatuses []*git_model.CommitStatus,
 		}
 	}
 
+	if matchedCount != len(requiredContexts) {
+		return structs.CommitStatusPending
+	}
+
 	if matchedCount == 0 {
 		status := git_model.CalcCommitStatus(commitStatuses)
 		if status != nil {

templates/repo/issue/view_content/pull.tmpl

@@ -24,6 +24,7 @@
 		{{template "repo/pulls/status" (dict
 			"CommitStatus" .LatestCommitStatus
 			"CommitStatuses" .LatestCommitStatuses
+			"MissingRequiredChecks" .MissingRequiredChecks
 			"ShowHideChecks" true
 			"is_context_required" .is_context_required
 		)}}

templates/repo/pulls/status.tmpl

@@ -2,6 +2,7 @@
 Template Attributes:
 * CommitStatus: summary of all commit status state
 * CommitStatuses: all commit status elements
+* MissingRequiredChecks: commit check contexts that are required by branch protection but not present
 * ShowHideChecks: whether use a button to show/hide the checks
 * is_context_required: Used in pull request commit status check table
 */}}
@@ -9,7 +10,7 @@ Template Attributes:
 {{if .CommitStatus}}
 <div class="commit-status-panel">
 	<div class="ui top attached header commit-status-header">
-		{{if eq .CommitStatus.State "pending"}}
+		{{if or (eq .CommitStatus.State "pending") (.MissingRequiredChecks)}}
 			{{ctx.Locale.Tr "repo.pulls.status_checking"}}
 		{{else if eq .CommitStatus.State "success"}}
 			{{ctx.Locale.Tr "repo.pulls.status_checks_success"}}
@@ -46,6 +47,13 @@ Template Attributes:
 				</div>
 			</div>
 		{{end}}
+		{{range .MissingRequiredChecks}}
+			<div class="commit-status-item">
+				{{svg "octicon-dot-fill" 18 "commit-status icon text yellow"}}
+				<div class="status-context gt-ellipsis">{{.}}</div>
+				<div class="ui label">{{ctx.Locale.Tr "repo.pulls.status_checks_requested"}}</div>
+			</div>
+		{{end}}
 	</div>
 </div>
 {{end}}