Adds documentation for the feature

doc/gitlab-basics/create-project.md

@@ -33,5 +33,43 @@
 
 1. Click **Create project**.
 
+## Push to create a new project
+
+> [Introduced](https://gitlab.com/gitlab-org/gitlab-ce/issues/26388) in GitLab 10.5.
+
+When you create a new repo locally, instead of going to GitLab to manually
+create a new project and then push the repo, you can directly push it to
+GitLab to create the new project, all without leaving your terminal. That
+will automatically create a new project under a GitLab namespace that you have access to 
+with its visibility set to private by default (you can later change it).
+
+This can be done by using either SSH or HTTP:
+
+```
+## Git push using SSH
+git push git@gitlab.com:namespace/nonexistent-project.git branch_name
+
+## Git push using HTTP
+git push https://gitlab.com/namespace/nonexistent-project.git branch_name
+```
+
+Once the push finishes successfully, a remote message will indicate
+the command to set the remote and the URL to the new project:
+
+```
+remote:
+remote: The private project namespace/nonexistent-project was created.
+remote:
+remote: To configure the remote, run:
+remote:   git remote add origin https://gitlab.com/namespace/nonexistent-project.git
+remote:
+remote: To view the project, visit:
+remote:   https://gitlab.com/namespace/nonexistent-project
+remote:
+```
+
+If the project name is already in use, your push will be rejected
+to prevent accidental overwriting the existing project.
+
 [import it]: ../workflow/importing/README.md
 [reserved]:  ../user/reserved_names.md

lib/gitlab/git_access.rb

@@ -2,6 +2,8 @@
 # class return an instance of `GitlabAccessStatus`
 module Gitlab
   class GitAccess
+    include Gitlab::Utils::StrongMemoize
+
     UnauthorizedError = Class.new(StandardError)
     NotFoundError = Class.new(StandardError)
     ProjectCreationError = Class.new(StandardError)
@@ -239,10 +241,12 @@ module Gitlab
     end
 
     def can_create_project_in_namespace?(cmd)
+      strong_memoize(:can_create_project_in_namespace) do
         return false unless push?(cmd) && target_namespace && project.blank?
 
         user.can?(:create_projects, target_namespace)
       end
+    end
 
     def http?
       protocol == 'http'