Option to set default branch at repository creation (#10803)

* Option to set default branch at repository creation
* Handle template repos with non-default master branch
* Add DefaultBranch handling on creation to API

Fix #9542

Signed-off-by: Andrew Thornton <art27@cantab.net>

templates/repo/create.tmpl

@@ -162,6 +162,10 @@
 								<label>{{.i18n.Tr "repo.auto_init"}}</label>
 							</div>
 						</div>
+						<div class="inline field">
+							<label for="default_branch">{{.i18n.Tr "repo.default_branch"}}</label>
+							<input id="default_branch" name="default_branch" value="{{.default_branch}}" placeholder="master">
+						</div>
 					</div>
 
 					<br/>

templates/repo/empty.tmpl

@@ -52,7 +52,7 @@ git init
 git add README.md
 git commit -m "first commit"
 git remote add origin <span class="clone-url">{{if $.DisableSSH}}{{$.CloneLink.HTTPS}}{{else}}{{$.CloneLink.SSH}}{{end}}</span>
-git push -u origin master</code></pre>
+git push -u origin {{if ne .Repository.DefaultBranch "master"}}master:{{.Repository.DefaultBranch}}{{else}}master{{end}}</code></pre>
 								</div>
 							</div>
 							<div class="ui divider"></div>
@@ -61,7 +61,7 @@ git push -u origin master</code></pre>
 								<h3>{{.i18n.Tr "repo.push_exist_repo"}}</h3>
 								<div class="markdown">
 									<pre><code>git remote add origin <span class="clone-url">{{if $.DisableSSH}}{{$.CloneLink.HTTPS}}{{else}}{{$.CloneLink.SSH}}{{end}}</span>
-git push -u origin master</code></pre>
+git push -u origin {{.Repository.DefaultBranch}}</code></pre>
 								</div>
 							</div>
 						{{end}}

templates/swagger/v1_json.tmpl

@@ -10600,6 +10600,11 @@
           "type": "boolean",
           "x-go-name": "AutoInit"
         },
+        "default_branch": {
+          "description": "DefaultBranch of the repository (used when initializes and in template)",
+          "type": "string",
+          "x-go-name": "DefaultBranch"
+        },
         "description": {
           "description": "Description of the repository to create",
           "type": "string",