Revert "Merge branch 'mk-toggle-writing-to-auth-keys-1631' into 'master'"

This reverts commit e5669cb2, reversing
changes made to 3f42b5d8.

# Conflicts:
#	doc/administration/operations/speed_up_ssh.md

# Conflicts:
#	doc/administration/operations/speed_up_ssh.md

app/controllers/admin/application_settings_controller.rb

@@ -180,8 +180,7 @@ class Admin::ApplicationSettingsController < Admin::ApplicationController
       :check_namespace_plan,
       :mirror_max_delay,
       :mirror_max_capacity,
-      :mirror_capacity_threshold,
-      :authorized_keys_enabled
+      :mirror_capacity_threshold
     ]
   end
 end

app/views/admin/application_settings/_form.html.haml

@@ -671,22 +671,6 @@
           installations. Set to 0 to completely disable polling.
           = link_to icon('question-circle'), help_page_path('administration/polling')
 
-  %fieldset
-    %legend Performance optimization
-    .form-group
-      .col-sm-offset-2.col-sm-10
-        .checkbox
-          = f.label :authorized_keys_enabled do
-            = f.check_box :authorized_keys_enabled
-            Write to "authorized_keys" file
-          .help-block
-            By default, we write to the "authorized_keys" file to support Git
-            over SSH without additional configuration. GitLab can be optimized
-            to authenticate SSH keys via the database file. Only uncheck this
-            if you have configured your OpenSSH server to use the
-            AuthorizedKeysCommand. Click on the help icon for more details.
-            = link_to icon('question-circle'), help_page_path('administration/operations/speed_up_ssh', anchor: 'the-solution')
-
   - if Gitlab::Geo.license_allows?
     %fieldset
       %legend GitLab Geo

doc/administration/operations.md

@@ -6,4 +6,3 @@
 - [Cleaning up Redis sessions](operations/cleaning_up_redis_sessions.md)
 - [Understanding Unicorn and unicorn-worker-killer](operations/unicorn.md)
 - [Moving repositories to a new location](operations/moving_repositories.md)
-- [Speed up SSH operations](operations/speed_up_ssh.md)

doc/administration/operations/speed_up_ssh.md

@@ -51,18 +51,6 @@ sudo service sshd reload
 
 Confirm that SSH is working by removing your user's SSH key in the UI, adding a new one, and attempting to pull a repo.
 
-> **Warning:** Do not disable writes until SSH is confirmed to be working perfectly because the file will quickly become out-of-date.
-
-In the case of lookup failures (which are not uncommon), the `authorized_keys` file will still be scanned. So git SSH performance will still be slow for many users as long as a large file exists.
-
-You can disable any more writes to the `authorized_keys` file by unchecking `Write to "authorized_keys" file` in the Application Settings of your GitLab installation.
-
-![Write to authorized keys setting](img/write_to_authorized_keys_setting.png)
-
-Again, confirm that SSH is working by removing your user's SSH key in the UI, adding a new one, and attempting to pull a repo.
-
-Then you can backup and delete your `authorized_keys` file for best performance.
-
 ## How to go back to using the `authorized_keys` file
 
 This is a brief overview. Please refer to the above instructions for more context.

lib/gitlab/shell.rb

@@ -197,8 +197,6 @@ module Gitlab
     #   add_key("key-42", "sha-rsa ...")
     #
     def add_key(key_id, key_content)
-      return unless self.authorized_keys_enabled?
-
       Gitlab::Utils.system_silent([gitlab_shell_keys_path,
                                    'add-key', key_id, self.class.strip_key(key_content)])
     end
@@ -208,8 +206,6 @@ module Gitlab
     # Ex.
     #   batch_add_keys { |adder| adder.add_key("key-42", "sha-rsa ...") }
     def batch_add_keys(&block)
-      return unless self.authorized_keys_enabled?
-
       IO.popen(%W(#{gitlab_shell_path}/bin/gitlab-keys batch-add-keys), 'w') do |io|
         yield(KeyAdder.new(io))
       end
@@ -221,8 +217,6 @@ module Gitlab
     #   remove_key("key-342", "sha-rsa ...")
     #
     def remove_key(key_id, key_content)
-      return unless self.authorized_keys_enabled?
-
       Gitlab::Utils.system_silent([gitlab_shell_keys_path,
                                    'rm-key', key_id, key_content])
     end
@@ -233,8 +227,6 @@ module Gitlab
     #   remove_all_keys
     #
     def remove_all_keys
-      return unless self.authorized_keys_enabled?
-
       Gitlab::Utils.system_silent([gitlab_shell_keys_path, 'clear'])
     end
 
@@ -364,9 +356,5 @@ module Gitlab
     def gitlab_shell_keys_path
       File.join(gitlab_shell_path, 'bin', 'gitlab-keys')
     end
-
-    def authorized_keys_enabled?
-      current_application_settings.authorized_keys_enabled
-    end
   end
 end

spec/lib/gitlab/shell_spec.rb

@@ -104,7 +104,6 @@ describe Gitlab::Shell, lib: true do
   end
 
   describe '#add_key' do
-    context 'when authorized_keys_enabled is true' do
     it 'removes trailing garbage' do
       allow(gitlab_shell).to receive(:gitlab_shell_keys_path).and_return(:gitlab_shell_keys_path)
       expect(Gitlab::Utils).to receive(:system_silent).with(
@@ -115,93 +114,6 @@ describe Gitlab::Shell, lib: true do
     end
   end
 
-    context 'when authorized_keys_enabled is false' do
-      before do
-        stub_application_setting(authorized_keys_enabled: false)
-      end
-
-      it 'does nothing' do
-        expect(Gitlab::Utils).not_to receive(:system_silent)
-
-        gitlab_shell.add_key('key-123', 'ssh-rsa foobar trailing garbage')
-      end
-    end
-  end
-
-  describe '#batch_add_keys' do
-    context 'when authorized_keys_enabled is true' do
-      it 'instantiates KeyAdder' do
-        expect_any_instance_of(Gitlab::Shell::KeyAdder).to receive(:add_key).with('key-123', 'ssh-rsa foobar')
-
-        gitlab_shell.batch_add_keys do |adder|
-          adder.add_key('key-123', 'ssh-rsa foobar')
-        end
-      end
-    end
-
-    context 'when authorized_keys_enabled is false' do
-      before do
-        stub_application_setting(authorized_keys_enabled: false)
-      end
-
-      it 'does nothing' do
-        expect_any_instance_of(Gitlab::Shell::KeyAdder).not_to receive(:add_key)
-
-        gitlab_shell.batch_add_keys do |adder|
-          adder.add_key('key-123', 'ssh-rsa foobar')
-        end
-      end
-    end
-  end
-
-  describe '#remove_key' do
-    context 'when authorized_keys_enabled is true' do
-      it 'removes trailing garbage' do
-        allow(gitlab_shell).to receive(:gitlab_shell_keys_path).and_return(:gitlab_shell_keys_path)
-        expect(Gitlab::Utils).to receive(:system_silent).with(
-          [:gitlab_shell_keys_path, 'rm-key', 'key-123', 'ssh-rsa foobar']
-        )
-
-        gitlab_shell.remove_key('key-123', 'ssh-rsa foobar')
-      end
-    end
-
-    context 'when authorized_keys_enabled is false' do
-      before do
-        stub_application_setting(authorized_keys_enabled: false)
-      end
-
-      it 'does nothing' do
-        expect(Gitlab::Utils).not_to receive(:system_silent)
-
-        gitlab_shell.remove_key('key-123', 'ssh-rsa foobar')
-      end
-    end
-  end
-
-  describe '#remove_all_keys' do
-    context 'when authorized_keys_enabled is true' do
-      it 'removes trailing garbage' do
-        allow(gitlab_shell).to receive(:gitlab_shell_keys_path).and_return(:gitlab_shell_keys_path)
-        expect(Gitlab::Utils).to receive(:system_silent).with([:gitlab_shell_keys_path, 'clear'])
-
-        gitlab_shell.remove_all_keys
-      end
-    end
-
-    context 'when authorized_keys_enabled is false' do
-      before do
-        stub_application_setting(authorized_keys_enabled: false)
-      end
-
-      it 'does nothing' do
-        expect(Gitlab::Utils).not_to receive(:system_silent)
-
-        gitlab_shell.remove_all_keys
-      end
-    end
-  end
-
   describe Gitlab::Shell::KeyAdder, lib: true do
     describe '#add_key' do
       it 'removes trailing garbage' do