Add support for --update-head-ok to fetch (#660)

Signed-off-by: Dylan Rainwater <[email protected]>
Signed-off-by: Dylan Rainwater <[email protected]>

Author: dylanrainwater

README.md

@@ -311,6 +311,7 @@ g.fetch
 g.fetch(g.remotes.first)
 g.fetch('origin', {:ref => 'some/ref/head'} )
 g.fetch(all: true, force: true, depth: 2)
+g.fetch('origin', {:'update-head-ok' => true})
 
 g.pull
 g.pull(Git::Repo, Git::Branch) # fetch and a merge

lib/git/lib.rb

@@ -951,6 +951,7 @@ def fetch(remote, opts)
       arr_opts << '--prune' if opts[:p] || opts[:prune]
       arr_opts << '--prune-tags' if opts[:P] || opts[:'prune-tags']
       arr_opts << '--force' if opts[:f] || opts[:force]
+      arr_opts << '--update-head-ok' if opts[:u] || opts[:'update-head-ok']
       arr_opts << '--unshallow' if opts[:unshallow]
       arr_opts << '--depth' << opts[:depth] if opts[:depth]
       arr_opts << '--' if remote || opts[:ref]

tests/units/test_remotes.rb

@@ -147,6 +147,13 @@ def test_fetch_cmd_with_all_with_other_args
     assert_command_line(expected_command_line, git_cmd, git_cmd_args)
   end
 
+  def test_fetch_cmd_with_update_head_ok
+    expected_command_line = ['fetch', '--update-head-ok']
+    git_cmd = :fetch
+    git_cmd_args = [:'update-head-ok' => true]
+    assert_command_line(expected_command_line, git_cmd, git_cmd_args)
+  end
+
   def test_fetch_command_injection
     test_file = 'VULNERABILITY_EXISTS'
     vulnerability_exists = false