Let users set name/path on project fork using API

app/services/projects/fork_service.rb

@@ -38,8 +38,8 @@ module Projects
       new_params = {
         visibility_level:       allowed_visibility_level,
         description:            @project.description,
-        name:                   @project.name,
-        path:                   @project.path,
+        name:                   target_name,
+        path:                   target_path,
         shared_runners_enabled: @project.shared_runners_enabled,
         namespace_id:           target_namespace.id,
         fork_network:           fork_network,
@@ -94,6 +94,14 @@ module Projects
       Projects::ForksCountService.new(@project).refresh_cache
     end
+    def target_path
+      @target_path ||= @params[:path] || @project.path
+    end
+
+    def target_name
+      @target_name ||= @params[:name] || @project.name
+    end
+
     def target_namespace
       @target_namespace ||= @params[:namespace] || current_user.namespace
     end

changelogs/unreleased/40795-set-project-name-on-fork-api.yml

+---
+title: Add ability to set path and name for project on fork using API
+merge_request: 25363
+author:
+type: added

doc/api/projects.md

@@ -771,6 +771,8 @@ POST /projects/:id/fork
 | --------- | ---- | -------- | ----------- |
 | `id` | integer/string | yes | The ID or [URL-encoded path of the project](README.md#namespaced-path-encoding) |
 | `namespace` | integer/string | yes | The ID or path of the namespace that the project will be forked to |
+| `path` | string | no | The path that will be assigned to the resultant project after forking |
+| `name` | string | no | The name that will be assigned to the resultant project after forking |
 ## List Forks of a project

lib/api/projects.rb

@@ -258,6 +258,8 @@ module API
       end
       params do
         optional :namespace, type: String, desc: 'The ID or name of the namespace that the project will be forked into'
+        optional :path, type: String, desc: 'The path that will be assigned to the fork'
+        optional :name, type: String, desc: 'The name that will be assigned to the fork'
       end
       post ':id/fork' do
         Gitlab::QueryLimiting.whitelist('https://gitlab.com/gitlab-org/gitlab-ce/issues/42284')