Update cloned git repo remote if url changed

If the URL of a `GitRepository` changes we can't know that our cloned
sparse repo is still valid so we should update the remote and refresh

app/models/git_repository.rb

@@ -16,6 +16,7 @@ class GitRepository < ApplicationRecord
 
   has_many :git_branches, :dependent => :destroy
   has_many :git_tags, :dependent => :destroy
+  after_update  :broadcast_update_repo_remote, :if => proc { |object| object.previous_changes.include?('url') }
   after_destroy :broadcast_repo_dir_delete
 
   INFO_KEYS = %w[commit_sha commit_message commit_time name].freeze
@@ -25,6 +26,18 @@ def self.delete_repo_dir(id, directory_name)
     FileUtils.rm_rf(directory_name)
   end
 
+  def update_repo_remote
+    git_transaction do
+      if Dir.exist?(directory_name)
+        with_worktree do |worktree|
+          # TODO: add this to GitWorktree
+          worktree.instance_variable_get(:@repo).remotes.set_url("origin", url)
+        end
+        refresh
+      end
+    end
+  end
+
   # Ping the git repository endpoint to verify that the network connection is still up.
   # We use this approach for now over Rugged#check_connection because of a segfault:
   #
@@ -279,6 +292,14 @@ def proxy_url
     URI::Generic.build(uri_opts).to_s
   end
 
+  def broadcast_update_repo_remote
+    MiqQueue.broadcast(
+      :class_name  => self.class.name,
+      :instance_id => id,
+      :method_name => "update_repo_remote"
+    )
+  end
+
   def broadcast_repo_dir_delete
     MiqQueue.broadcast(
       :class_name  => self.class.name,