Hide command line merge instructions when user can't push (#17339)

Hides the command line instructions if the authenticated user can't push to the base branch.
Closes #17121

Author: qwerty287

Diff for: routers/web/repo/issue.go

@@ -1543,6 +1543,7 @@ func ViewIssue(ctx *context.Context) {
 			ctx.ServerError("LoadProtectedBranch", err)
 			return
 		}
+		ctx.Data["ShowMergeInstructions"] = true
 		if pull.ProtectedBranch != nil {
 			cnt := pull.ProtectedBranch.GetGrantedApprovalsCount(pull)
 			ctx.Data["IsBlockedByApprovals"] = !pull.ProtectedBranch.HasEnoughApprovals(pull)
@@ -1554,6 +1555,7 @@ func ViewIssue(ctx *context.Context) {
 			ctx.Data["ChangedProtectedFiles"] = pull.ChangedProtectedFiles
 			ctx.Data["IsBlockedByChangedProtectedFiles"] = len(pull.ChangedProtectedFiles) != 0
 			ctx.Data["ChangedProtectedFilesNum"] = len(pull.ChangedProtectedFiles)
+			ctx.Data["ShowMergeInstructions"] = pull.ProtectedBranch.CanUserPush(ctx.User.ID)
 		}
 		ctx.Data["WillSign"] = false
 		if ctx.User != nil {

Diff for: templates/repo/issue/view_content/pull.tmpl

@@ -485,25 +485,27 @@
 									{{end}}
 								</div>
 							</div>
-							<div class="instruct-toggle ml-3"> {{$.i18n.Tr "repo.pulls.merge_instruction_hint" | Safe}} </div>
-							<div class="instruct-content" style="display:none">
-								<div class="ui divider"></div>
-								<div><h3 class="di">{{$.i18n.Tr "step1"}} </h3>{{$.i18n.Tr "repo.pulls.merge_instruction_step1_desc"}}</div>
-								<div class="ui secondary segment">
-									{{if eq .Issue.PullRequest.Flow 0}}
-										<div>git checkout -b {{if ne .Issue.PullRequest.HeadRepo.ID .Issue.PullRequest.BaseRepo.ID}}{{.Issue.PullRequest.HeadRepo.OwnerName}}-{{end}}{{.Issue.PullRequest.HeadBranch}} {{.Issue.PullRequest.BaseBranch}}</div>
-										<div>git pull {{if ne .Issue.PullRequest.HeadRepo.ID .Issue.PullRequest.BaseRepo.ID}}{{.Issue.PullRequest.HeadRepo.HTMLURL}}{{else}}origin{{end}} {{.Issue.PullRequest.HeadBranch}}</div>
-									{{else}}
-										<div>git fetch origin {{.Issue.PullRequest.GetGitRefName}}:{{.Issue.PullRequest.HeadBranch}}</div>
-									{{end}}
-								</div>
-								<div><h3 class="di">{{$.i18n.Tr "step2"}} </h3>{{$.i18n.Tr "repo.pulls.merge_instruction_step2_desc"}}</div>
-								<div class="ui secondary segment">
-									<div>git checkout {{.Issue.PullRequest.BaseBranch}}</div>
-									<div>git merge --no-ff {{if ne .Issue.PullRequest.HeadRepo.ID .Issue.PullRequest.BaseRepo.ID}}{{.Issue.PullRequest.HeadRepo.OwnerName}}-{{end}}{{.Issue.PullRequest.HeadBranch}}</div>
-									<div>git push origin {{.Issue.PullRequest.BaseBranch}}</div>
+							{{if .ShowMergeInstructions}}
+								<div class="instruct-toggle ml-3"> {{$.i18n.Tr "repo.pulls.merge_instruction_hint" | Safe}} </div>
+								<div class="instruct-content" style="display:none">
+									<div class="ui divider"></div>
+									<div><h3 class="di">{{$.i18n.Tr "step1"}} </h3>{{$.i18n.Tr "repo.pulls.merge_instruction_step1_desc"}}</div>
+									<div class="ui secondary segment">
+										{{if eq .Issue.PullRequest.Flow 0}}
+											<div>git checkout -b {{if ne .Issue.PullRequest.HeadRepo.ID .Issue.PullRequest.BaseRepo.ID}}{{.Issue.PullRequest.HeadRepo.OwnerName}}-{{end}}{{.Issue.PullRequest.HeadBranch}} {{.Issue.PullRequest.BaseBranch}}</div>
+											<div>git pull {{if ne .Issue.PullRequest.HeadRepo.ID .Issue.PullRequest.BaseRepo.ID}}{{.Issue.PullRequest.HeadRepo.HTMLURL}}{{else}}origin{{end}} {{.Issue.PullRequest.HeadBranch}}</div>
+										{{else}}
+											<div>git fetch origin {{.Issue.PullRequest.GetGitRefName}}:{{.Issue.PullRequest.HeadBranch}}</div>
+										{{end}}
+									</div>
+									<div><h3 class="di">{{$.i18n.Tr "step2"}} </h3>{{$.i18n.Tr "repo.pulls.merge_instruction_step2_desc"}}</div>
+									<div class="ui secondary segment">
+										<div>git checkout {{.Issue.PullRequest.BaseBranch}}</div>
+										<div>git merge --no-ff {{if ne .Issue.PullRequest.HeadRepo.ID .Issue.PullRequest.BaseRepo.ID}}{{.Issue.PullRequest.HeadRepo.OwnerName}}-{{end}}{{.Issue.PullRequest.HeadBranch}}</div>
+										<div>git push origin {{.Issue.PullRequest.BaseBranch}}</div>
+									</div>
 								</div>
-							</div>
+							{{end}}
 						{{else}}
 							<div class="ui divider"></div>
 							<div class="item text red">