sshfs_reverse_mount: use ruby Etc lib for owner/group

When I started to go in and add owner/group support for
Darwin reverse sshfs mounting I noticed Mac OS doesn't have
`getent`. Let's use the builtin ruby library here instead
which should work cross platform.

lib/vagrant-sshfs/cap/host/darwin/sshfs_reverse_mount.rb

@@ -1,3 +1,4 @@
+require "etc"
 require "log4r"
 require "vagrant/util/retryable"
 require "tempfile"
@@ -88,9 +89,35 @@ def self.sshfs_mount(machine, opts)
 
           ssh_opts_append = opts[:ssh_opts_append].to_s # provided by user
 
+          # Support for user provided mount_options, owner, group
+          # https://github.com/hashicorp/vagrant/blob/2c3397c46851ef29a3589bf3214a3eee12da8484/website/content/docs/synced-folders/basic_usage.mdx#options
+          mount_options = opts.fetch(:mount_options, [])
+          if (opts.has_key?(:owner) and opts[:owner]) or
+             (opts.has_key?(:group) and opts[:group])
+            # Identify the uid
+            if opts.has_key?(:owner) and opts[:owner]
+              mount_uid = Etc::getpwnam(opts[:owner]).uid
+            else
+              mount_uid = Etc::getpwnam(Etc.getlogin).uid
+            end
+            # Identify the gid. If a group was provided use that otherwise use
+            # the group detected with the detected user id.
+            if opts.has_key?(:group) and opts[:group]
+              mount_gid = Etc::getgrnam(opts[:group]).gid
+            else
+              mount_gid = Etc::getpwnam(Etc.getlogin).gid
+            end
+            # Add them to the mount options
+            mount_options.append("uid=#{mount_uid}")
+            mount_options.append("gid=#{mount_gid}")
+          end
+
           # SSHFS executable options
           sshfs_opts = opts[:sshfs_opts]
           sshfs_opts_append = opts[:sshfs_opts_append].to_s # provided by user
+          if not mount_options.empty?()
+            sshfs_opts_append+= ' -o ' + mount_options.join(',') + ' '
+          end
 
           username = machine.ssh_info[:username]
           host = machine.ssh_info[:host]

lib/vagrant-sshfs/cap/host/linux/sshfs_reverse_mount.rb

@@ -1,3 +1,4 @@
+require "etc"
 require "log4r"
 require "vagrant/util/retryable"
 require "tempfile"
@@ -92,33 +93,18 @@ def self.sshfs_mount(machine, opts)
           mount_options = opts.fetch(:mount_options, [])
           if (opts.has_key?(:owner) and opts[:owner]) or
              (opts.has_key?(:group) and opts[:group])
-            # Find the `id` command on the system and set the error class
-            id_command = Vagrant::Util::Which.which('id')
-            getent_command = Vagrant::Util::Which.which('getent')
-            error_class = VagrantPlugins::SyncedFolderSSHFS::Errors::SSHFSFindUIDGIDFailed
             # Identify the uid
-            cmd = "#{id_command} -u #{opts[:owner]}"
-            result = Vagrant::Util::Subprocess.execute(*cmd.split())
-            if result.exit_code != 0
-              raise error_class, command: cmd, stdout: result.stdout, stderr: result.stderr
+            if opts.has_key?(:owner) and opts[:owner]
+              mount_uid = Etc::getpwnam(opts[:owner]).uid
+            else
+              mount_uid = Etc::getpwnam(Etc.getlogin).uid
             end
-            mount_uid = result.stdout.chomp
             # Identify the gid. If a group was provided use that otherwise use
             # the group detected with the detected user id.
             if opts.has_key?(:group) and opts[:group]
-              cmd = "#{getent_command} group #{opts[:group]}"
-              result = Vagrant::Util::Subprocess.execute(*cmd.split())
-              if result.exit_code != 0
-                raise error_class, command: cmd, stdout: result.stdout, stderr: result.stderr
-              end
-              mount_gid = result.stdout.split(':').at(2).to_s.chomp
+              mount_gid = Etc::getgrnam(opts[:group]).gid
             else
-              cmd = "#{id_command} -g #{mount_uid}"
-              result = Vagrant::Util::Subprocess.execute(*cmd.split())
-              if result.exit_code != 0
-                raise error_class, command: cmd, stdout: result.stdout, stderr: result.stderr
-              end
-              mount_gid = result.stdout.chomp
+              mount_gid = Etc::getpwnam(Etc.getlogin).gid
             end
             # Add them to the mount options
             mount_options.append("uid=#{mount_uid}")

lib/vagrant-sshfs/errors.rb

@@ -37,10 +37,6 @@ class SSHFSExeNotAvailable < SSHFSError
       class SSHFSGetAbsolutePathFailed < SSHFSError
         error_key(:get_absolute_path_failed)
       end
-
-      class SSHFSFindUIDGIDFailed < SSHFSError
-        error_key(:find_uid_gid_failed)
-      end
     end
   end
 end

locales/synced_folder_sshfs.yml

@@ -92,18 +92,4 @@ en:
 
           Stderr from the command:
 
-          %{stderr}
-        find_uid_gid_failed: |-
-          Attempting to find the UID/GID failed.
-
-          The command and output are:
-
-          %{command}
-
-          Stdout from the command:
-
-          %{stdout}
-
-          Stderr from the command:
-
           %{stderr}