system: Make accounts and groups at activation time.

* gnu/services/base.scm (guix-build-accounts): Remove #:gid parameter;
  add #:group.  Remove 'password' and 'gid' fields in 'user-account'
  form, and add 'group'.
  (guix-service): Remove #:build-user-gid parameter.  Remove 'id' field
  in 'user-group' form.
* gnu/system.scm (etc-directory): Remove #:groups and #:accounts.  No
  longer produce files "passwd", "shadow", and "group".  Adjust caller
  accordingly.
  (%root-account): New variable.
  (operating-system-accounts): Add 'users' variable.  Add %ROOT-ACCOUNT
  only of 'operating-system-users' doesn't already contain a root
  account.
  (user-group->gexp, user-account->gexp): New procedures.
  (operating-system-boot-script): Add calls to 'setenv' and
  'activate-users+groups' in gexp.
* gnu/system/linux.scm (base-pam-services): Add PAM services for
  "user{add,del,mode}" and "group{add,del,mod}".
* gnu/system/shadow.scm (<user-account>)[gid]: Rename to...
  [group]: ... this.
  [supplementary-groups]: New field.
  [uid, password]: Default to #f.
  (<user-group>)[id]: Default to #f.
  (group-file, passwd-file): Remove.
* gnu/system/vm.scm (operating-system-default-contents)[user-directories]:
  Remove.  Add "/home" to the directives.
* guix/build/activation.scm (add-group, add-user,
  activate-users+groups): New procedures.

1 files changed, 2 insertions, 13 deletions

diff --git a/gnu/system/vm.scm b/gnu/system/vm.scm
index 2520853205..ede7ea7726 100644
--- a/gnu/system/vm.scm
+++ b/gnu/system/vm.scm
@@ -267,16 +267,6 @@ such as /etc files."
 (define (operating-system-default-contents os)
   "Return a list of directives suitable for 'system-qemu-image' describing the
 basic contents of the root file system of OS."
-  (define (user-directories user)
-    (let ((home (user-account-home-directory user))
-          ;; XXX: Deal with automatically allocated ids.
-          (uid  (or (user-account-uid user) 0))
-          (gid  (or (user-account-gid user) 0))
-          (root (string-append "/var/guix/profiles/per-user/"
-                               (user-account-name user))))
-      #~((directory #$root #$uid #$gid)
-         (directory #$home #$uid #$gid))))
-
   (mlet* %store-monad ((os-drv    (operating-system-derivation os))
                        (build-gid (operating-system-build-gid os))
                        (profile   (operating-system-profile os)))
@@ -293,9 +283,8 @@ basic contents of the root file system of OS."
                (directory "/tmp")
                (directory "/var/guix/profiles/per-user/root" 0 0)
 
-               (directory "/root" 0 0)             ; an exception
-               #$@(append-map user-directories
-                              (operating-system-users os))))))
+               (directory "/root" 0 0)            ; an exception
+               (directory "/home" 0 0)))))
 
 (define* (system-qemu-image os
                             #:key