services: 'mingetty-service' no longer takes monadic values.

* gnu/services/base.scm (mingetty-service): Change default value of
  #:motd from a monadic value to a <plain-file>.  Assume MOTD to be a
  file-like object.  Assume LOGIN-PROGRAM is a gexp or #f.
  (%base-services): Use 'plain-file' instead of 'text-file' for motd.
* gnu/system/linux.scm (unix-pam-service): Update docstring to mention
  that MOTD is a file-like object.
* doc/guix.texi (Base Services): Adjust 'mingetty-service' documentation
  accordingly.

1 files changed, 5 insertions, 12 deletions

diff --git a/gnu/services/base.scm b/gnu/services/base.scm
index 7f37b3da00..865d461a1e 100644
--- a/gnu/services/base.scm
+++ b/gnu/services/base.scm
@@ -357,7 +357,7 @@ stopped before 'kill' is called."
 
 (define* (mingetty-service tty
                            #:key
-                           (motd (text-file "motd" "Welcome.\n"))
+                           (motd (plain-file "motd" "Welcome.\n"))
                            auto-login
                            login-program
                            login-pause?
@@ -374,19 +374,12 @@ automatically.  @var{login-pause?} can be set to @code{#t} in conjunction with
 @var{auto-login}, in which case the user will have to press a key before the
 login shell is launched.
 
-When true, @var{login-program} is a gexp or a monadic gexp denoting the name
+When true, @var{login-program} is a gexp denoting the name
 of the log-in program (the default is the @code{login} program from the Shadow
 tool suite.)
 
-@var{motd} is a monadic value containing a text file to use as
-the ``message of the day''."
-  (mlet %store-monad ((motd motd)
-                      (login-program (cond ((gexp? login-program)
-                                            (return login-program))
-                                           ((not login-program)
-                                            (return #f))
-                                           (else
-                                            login-program))))
+@var{motd} is a file-like object to use as the ``message of the day''."
+  (with-monad %store-monad
     (return
      (service
       (documentation (string-append "Run mingetty on " tty "."))
@@ -861,7 +854,7 @@ gexp, to open it, and evaluate @var{close} to close it."
 
 (define %base-services
   ;; Convenience variable holding the basic services.
-  (let ((motd (text-file "motd" "
+  (let ((motd (plain-file "motd" "
 This is the GNU operating system, welcome!\n\n")))
     (list (console-font-service "tty1")
           (console-font-service "tty2")