Revert "system: Add a 'needed-for-boot?' field to 'mapped-device'."
[jackhill/guix/guix.git] / gnu / system.scm
index d76c367..e1ed1a2 100644 (file)
   #:use-module (guix records)
   #:use-module (guix packages)
   #:use-module (guix derivations)
+  #:use-module (guix profiles)
   #:use-module (gnu packages base)
   #:use-module (gnu packages bash)
+  #:use-module (gnu packages guile)
+  #:use-module (gnu packages which)
   #:use-module (gnu packages admin)
+  #:use-module (gnu packages linux)
+  #:use-module (gnu packages pciutils)
   #:use-module (gnu packages package-management)
+  #:use-module (gnu packages which)
+  #:use-module (gnu packages less)
+  #:use-module (gnu packages zile)
+  #:use-module (gnu packages nano)
+  #:use-module (gnu packages lsof)
+  #:use-module (gnu packages gawk)
+  #:use-module (gnu packages compression)
+  #:use-module (gnu packages firmware)
+  #:autoload   (gnu packages cryptsetup) (cryptsetup)
   #:use-module (gnu services)
   #:use-module (gnu services dmd)
   #:use-module (gnu services base)
   #:use-module (gnu system grub)
   #:use-module (gnu system shadow)
+  #:use-module (gnu system locale)
   #:use-module (gnu system linux)
   #:use-module (gnu system linux-initrd)
+  #:use-module (gnu system file-systems)
   #:use-module (ice-9 match)
   #:use-module (srfi srfi-1)
   #:use-module (srfi srfi-26)
+  #:use-module (srfi srfi-34)
+  #:use-module (srfi srfi-35)
   #:export (operating-system
             operating-system?
+
+            operating-system-bootloader
             operating-system-services
             operating-system-user-services
             operating-system-packages
-            operating-system-bootloader-entries
             operating-system-host-name
+            operating-system-hosts-file
             operating-system-kernel
             operating-system-initrd
             operating-system-users
             operating-system-groups
+            operating-system-issue
             operating-system-packages
             operating-system-timezone
             operating-system-locale
+            operating-system-locale-definitions
+            operating-system-mapped-devices
             operating-system-file-systems
+            operating-system-activation-script
 
             operating-system-derivation
             operating-system-profile
+            operating-system-grub.cfg
+
+            local-host-aliases
+            %setuid-programs
+            %base-packages
+            %base-firmware
 
-            <file-system>
-            file-system
-            file-system?
-            file-system-device
-            file-system-mount-point
-            file-system-type
-            file-system-needed-for-boot?
-            file-system-flags
-            file-system-options))
+            luks-device-mapping))
 
 ;;; Commentary:
 ;;;
   operating-system?
   (kernel operating-system-kernel                 ; package
           (default linux-libre))
-  (bootloader operating-system-bootloader         ; package
-              (default grub))
-  (bootloader-entries operating-system-bootloader-entries ; list
-                      (default '()))
+  (bootloader operating-system-bootloader)        ; <grub-configuration>
+
   (initrd operating-system-initrd                 ; (list fs) -> M derivation
-          (default qemu-initrd))
+          (default base-initrd))
+  (firmware operating-system-firmware             ; list of packages
+            (default %base-firmware))
 
   (host-name operating-system-host-name)          ; string
+  (hosts-file operating-system-hosts-file         ; M item | #f
+              (default #f))
 
-  (file-systems operating-system-file-systems     ; list of fs
+  (mapped-devices operating-system-mapped-devices ; list of <mapped-device>
+                  (default '()))
+  (file-systems operating-system-file-systems)    ; list of fs
+  (swap-devices operating-system-swap-devices     ; list of strings
                 (default '()))
 
   (users operating-system-users                   ; list of user accounts
          (default '()))
   (groups operating-system-groups                 ; list of user groups
-          (default (list (user-group
-                          (name "root")
-                          (id 0)))))
+          (default %base-groups))
+
+  (skeletons operating-system-skeletons           ; list of name/monadic value
+             (default (default-skeletons)))
+  (issue operating-system-issue                   ; string
+         (default %default-issue))
 
   (packages operating-system-packages             ; list of (PACKAGE OUTPUT...)
-            (default (list coreutils              ; or just PACKAGE
-                           grep
-                           sed
-                           findutils
-                           guile
-                           bash
-                           (@ (gnu packages dmd) dmd)
-                           guix
-                           tzdata)))
+            (default %base-packages))             ; or just PACKAGE
 
   (timezone operating-system-timezone)            ; string
-  (locale   operating-system-locale)              ; string
+  (locale   operating-system-locale               ; string
+            (default "en_US.utf8"))
+  (locale-definitions operating-system-locale-definitions ; list of <locale-definition>
+                      (default %default-locale-definitions))
 
   (services operating-system-user-services        ; list of monadic services
             (default %base-services))
   (sudoers operating-system-sudoers               ; /etc/sudoers contents
            (default %sudoers-specification)))
 
-;; File system declaration.
-(define-record-type* <file-system> file-system
-  make-file-system
-  file-system?
-  (device           file-system-device)           ; string
-  (mount-point      file-system-mount-point)      ; string
-  (type             file-system-type)             ; string
-  (flags            file-system-flags             ; list of symbols
-                    (default '()))
-  (options          file-system-options           ; string or #f
-                    (default #f))
-  (needed-for-boot? file-system-needed-for-boot?  ; Boolean
-                    (default #f))
-  (check?           file-system-check?            ; Boolean
-                    (default #t)))
-
 \f
 ;;;
 ;;; Derivation.
 ;;;
 
-(define* (union inputs
-                #:key (guile (%guile-for-build)) (system (%current-system))
-                (name "union"))
-  "Return a derivation that builds the union of INPUTS.  INPUTS is a list of
-input tuples."
-  (define builder
-    #~(begin
-        (use-modules (guix build union))
-
-        (define inputs '#$inputs)
-
-        (setvbuf (current-output-port) _IOLBF)
-        (setvbuf (current-error-port) _IOLBF)
-
-        (format #t "building union `~a' with ~a packages...~%"
-                #$output (length inputs))
-        (union-build #$output inputs)))
-
-  (gexp->derivation name builder
-                    #:system system
-                    #:modules '((guix build union))
-                    #:guile-for-build guile
-                    #:local-build? #t))
-
 (define* (file-union name files)
   "Return a derivation that builds a directory containing all of FILES.  Each
 item in FILES must be a list where the first element is the file name to use
@@ -184,35 +169,143 @@ file."
 
   (gexp->derivation name builder))
 
+(define (directory-union name things)
+  "Return a directory that is the union of THINGS."
+  (match things
+    ((one)
+     ;; Only one thing; return it.
+     (with-monad %store-monad (return one)))
+    (_
+     (gexp->derivation name
+                       #~(begin
+                           (use-modules (guix build union))
+                           (union-build #$output '#$things))
+                       #:modules '((guix build union))
+                       #:local-build? #t))))
+
+\f
+;;;
+;;; Services.
+;;;
+
+(define (open-luks-device source target)
+  "Return a gexp that maps SOURCE to TARGET as a LUKS device, using
+'cryptsetup'."
+  #~(zero? (system* (string-append #$cryptsetup "/sbin/cryptsetup")
+                    "open" "--type" "luks"
+                    #$source #$target)))
+
+(define (close-luks-device source target)
+  "Return a gexp that closes TARGET, a LUKS device."
+  #~(zero? (system* (string-append #$cryptsetup "/sbin/cryptsetup")
+                    "close" #$target)))
+
+(define luks-device-mapping
+  ;; The type of LUKS mapped devices.
+  (mapped-device-kind
+   (open open-luks-device)
+   (close close-luks-device)))
+
 (define (other-file-system-services os)
   "Return file system services for the file systems of OS that are not marked
 as 'needed-for-boot'."
   (define file-systems
-    (remove (lambda (fs)
-              (or (file-system-needed-for-boot? fs)
-                  (string=? "/" (file-system-mount-point fs))))
+    (remove file-system-needed-for-boot?
             (operating-system-file-systems os)))
 
+  (define (device-mappings fs)
+    (filter (lambda (md)
+              (string=? (string-append "/dev/mapper/"
+                                       (mapped-device-target md))
+                        (file-system-device fs)))
+            (operating-system-mapped-devices os)))
+
+  (define (requirements fs)
+    (map (lambda (md)
+           (symbol-append 'device-mapping-
+                          (string->symbol (mapped-device-target md))))
+         (device-mappings fs)))
+
   (sequence %store-monad
-            (map (match-lambda
-                  (($ <file-system> device target type flags opts #f check?)
-                   (file-system-service device target type
-                                        #:check? check?
-                                        #:options opts)))
+            (map (lambda (fs)
+                   (match fs
+                     (($ <file-system> device title target type flags opts
+                                       #f check? create?)
+                      (file-system-service device target type
+                                           #:title title
+                                           #:requirements (requirements fs)
+                                           #:check? check?
+                                           #:create-mount-point? create?
+                                           #:options opts
+                                           #:flags flags))))
                  file-systems)))
 
+(define (mapped-device-user device file-systems)
+  "Return a file system among FILE-SYSTEMS that uses DEVICE, or #f."
+  (let ((target (string-append "/dev/mapper/" (mapped-device-target device))))
+    (find (lambda (fs)
+            (string=? (file-system-device fs) target))
+          file-systems)))
+
+(define (operating-system-user-mapped-devices os)
+  "Return the subset of mapped devices that can be installed in
+user-land--i.e., those not needed during boot."
+  (let ((devices      (operating-system-mapped-devices os))
+        (file-systems (operating-system-file-systems os)))
+   (filter (lambda (md)
+             (let ((user (mapped-device-user md file-systems)))
+               (or (not user)
+                   (not (file-system-needed-for-boot? user)))))
+           devices)))
+
+(define (operating-system-boot-mapped-devices os)
+  "Return the subset of mapped devices that must be installed during boot,
+from the initrd."
+  (let ((devices      (operating-system-mapped-devices os))
+        (file-systems (operating-system-file-systems os)))
+   (filter (lambda (md)
+             (let ((user (mapped-device-user md file-systems)))
+               (and user (file-system-needed-for-boot? user))))
+           devices)))
+
+(define (device-mapping-services os)
+  "Return the list of device-mapping services for OS as a monadic list."
+  (sequence %store-monad
+            (map (lambda (md)
+                   (let* ((source (mapped-device-source md))
+                          (target (mapped-device-target md))
+                          (type   (mapped-device-type md))
+                          (open   (mapped-device-kind-open type))
+                          (close  (mapped-device-kind-close type)))
+                     (device-mapping-service target
+                                             (open source target)
+                                             (close source target))))
+                 (operating-system-user-mapped-devices os))))
+
+(define (swap-services os)
+  "Return the list of swap services for OS as a monadic list."
+  (sequence %store-monad
+            (map swap-service (operating-system-swap-devices os))))
+
 (define (essential-services os)
   "Return the list of essential services for OS.  These are special services
 that implement part of what's declared in OS are responsible for low-level
 bookkeeping."
-  (mlet* %store-monad ((root-fs   (root-file-system-service))
+  (define known-fs
+    (map file-system-mount-point (operating-system-file-systems os)))
+
+  (mlet* %store-monad ((mappings  (device-mapping-services os))
+                       (root-fs   (root-file-system-service))
                        (other-fs  (other-file-system-services os))
+                       (unmount   (user-unmount-service known-fs))
+                       (swaps     (swap-services os))
                        (procs     (user-processes-service
                                    (map (compose first service-provision)
                                         other-fs)))
                        (host-name (host-name-service
                                    (operating-system-host-name os))))
-    (return (cons* host-name procs root-fs other-fs))))
+    (return (cons* host-name procs root-fs unmount
+                   (append other-fs mappings swaps)))))
 
 (define (operating-system-services os)
   "Return all the services of OS, including \"internal\" services that do not
@@ -222,51 +315,95 @@ explicitly appear in OS."
        (essential (essential-services os)))
     (return (append essential user))))
 
+\f
+;;;
+;;; /etc.
+;;;
+
+(define %base-firmware
+  ;; Firmware usable by default.
+  (list ath9k-htc-firmware))
+
+(define %base-packages
+  ;; Default set of packages globally visible.  It should include anything
+  ;; required for basic administrator tasks.
+  (cons* procps psmisc which less zile nano
+         (@ (gnu packages admin) dmd) guix
+         lsof                                 ;for Guix's 'list-runtime-roots'
+         pciutils usbutils
+         util-linux inetutils isc-dhcp wireless-tools
+         net-tools                        ; XXX: remove when Inetutils suffices
+
+         ;; Get 'insmod' & co. from kmod, not module-init-tools, since udev
+         ;; already depends on it anyway.
+         kmod eudev
+
+         e2fsprogs kbd
+
+         ;; The packages below are also in %FINAL-INPUTS, so take them from
+         ;; there to avoid duplication.
+         (map canonical-package
+              (list guile-2.0 bash coreutils findutils grep sed
+                    diffutils patch gawk tar gzip bzip2 xz lzip))))
+
+(define %default-issue
+  ;; Default contents for /etc/issue.
+  "
+This is the GNU system.  Welcome.\n")
+
+(define (local-host-aliases host-name)
+  "Return aliases for HOST-NAME, to be used in /etc/hosts."
+  (string-append "127.0.0.1 localhost " host-name "\n"
+                 "::1       localhost " host-name "\n"))
+
+(define (default-/etc/hosts host-name)
+  "Return the default /etc/hosts file."
+  (text-file "hosts" (local-host-aliases host-name)))
+
 (define* (etc-directory #:key
                         (locale "C") (timezone "Europe/Paris")
-                        (accounts '())
-                        (groups '())
+                        (issue "Hello!\n")
+                        (skeletons '())
                         (pam-services '())
-                        (profile "/var/run/current-system/profile")
+                        (profile "/run/current-system/profile")
+                        hosts-file
                         (sudoers ""))
   "Return a derivation that builds the static part of the /etc directory."
   (mlet* %store-monad
-      ((passwd     (passwd-file accounts))
-       (shadow     (passwd-file accounts #:shadow? #t))
-       (group      (group-file groups))
-       (pam.d      (pam-services->directory pam-services))
+      ((pam.d      (pam-services->directory pam-services))
        (sudoers    (text-file "sudoers" sudoers))
        (login.defs (text-file "login.defs" "# Empty for now.\n"))
        (shells     (text-file "shells"            ; used by xterm and others
                               "\
 /bin/sh
-/run/current-system/bin/sh
-/run/current-system/bin/bash\n"))
-       (issue      (text-file "issue" "
-This is an alpha preview of the GNU system.  Welcome.
+/run/current-system/profile/bin/sh
+/run/current-system/profile/bin/bash\n"))
+       (issue      (text-file "issue" issue))
 
-This image features the GNU Guix package manager, which was used to
-build it (http://www.gnu.org/software/guix/).  The init system is
-GNU dmd (http://www.gnu.org/software/dmd/).
-
-You can log in as 'guest' or 'root' with no password.
-"))
+       ;; For now, generate a basic config so that /etc/hosts is honored.
+       (nsswitch   (text-file "nsswitch.conf"
+                              "hosts: files dns\n"))
 
        ;; TODO: Generate bashrc from packages' search-paths.
        (bashrc    (text-file* "bashrc"  "
-export PS1='\\u@\\h\\$ '
+export PS1='\\u@\\h \\w\\$ '
 
 export LC_ALL=\"" locale "\"
 export TZ=\"" timezone "\"
 export TZDIR=\"" tzdata "/share/zoneinfo\"
 
-export PATH=$HOME/.guix-profile/bin:" profile "/bin:" profile "/sbin
-export PATH=/run/setuid-programs:$PATH
+# Tell 'modprobe' & co. where to look for modules.
+export LINUX_MODULE_DIRECTORY=/run/booted-system/kernel/lib/modules
+
+export PATH=$HOME/.guix-profile/bin:/run/current-system/profile/bin
+export PATH=/run/setuid-programs:/run/current-system/profile/sbin:$PATH
 export CPATH=$HOME/.guix-profile/include:" profile "/include
 export LIBRARY_PATH=$HOME/.guix-profile/lib:" profile "/lib
+export INFOPATH=$HOME/.guix-profile/share/info:/run/current-system/profile/share/info
 alias ls='ls -p --color'
 alias ll='ls -l'
-")))
+"))
+       (skel      (skeleton-directory skeletons)))
     (file-union "etc"
                 `(("services" ,#~(string-append #$net-base "/etc/services"))
                   ("protocols" ,#~(string-append #$net-base "/etc/protocols"))
@@ -274,34 +411,42 @@ alias ll='ls -l'
                   ("pam.d" ,#~#$pam.d)
                   ("login.defs" ,#~#$login.defs)
                   ("issue" ,#~#$issue)
+                  ("nsswitch.conf" ,#~#$nsswitch)
+                  ("skel" ,#~#$skel)
                   ("shells" ,#~#$shells)
                   ("profile" ,#~#$bashrc)
+                  ("hosts" ,#~#$hosts-file)
                   ("localtime" ,#~(string-append #$tzdata "/share/zoneinfo/"
                                                  #$timezone))
-                  ("passwd" ,#~#$passwd)
-                  ("shadow" ,#~#$shadow)
-                  ("group" ,#~#$group)
-
                   ("sudoers" ,#~#$sudoers)))))
 
 (define (operating-system-profile os)
-  "Return a derivation that builds the default profile of OS."
-  ;; TODO: Replace with a real profile with a manifest.
-  (union (operating-system-packages os)
-         #:name "default-profile"))
+  "Return a derivation that builds the system profile of OS."
+  (profile-derivation (manifest (map package->manifest-entry
+                                     (operating-system-packages os)))))
+
+(define %root-account
+  ;; Default root account.
+  (user-account
+   (name "root")
+   (password "")
+   (uid 0) (group "root")
+   (comment "System administrator")
+   (home-directory "/root")))
 
 (define (operating-system-accounts os)
   "Return the user accounts for OS, including an obligatory 'root' account."
+  (define users
+    ;; Make sure there's a root account.
+    (if (find (lambda (user)
+                (and=> (user-account-uid user) zero?))
+              (operating-system-users os))
+        (operating-system-users os)
+        (cons %root-account (operating-system-users os))))
+
   (mlet %store-monad ((services (operating-system-services os)))
-    (return (cons (user-account
-                   (name "root")
-                   (password "")
-                   (uid 0) (gid 0)
-                   (comment "System administrator")
-                   (home-directory "/root"))
-                  (append (operating-system-users os)
-                          (append-map service-user-accounts
-                                      services))))))
+    (return (append users
+                    (append-map service-user-accounts services)))))
 
 (define (operating-system-etc-directory os)
   "Return that static part of the /etc directory of OS."
@@ -312,14 +457,16 @@ alias ll='ls -l'
                      (delete-duplicates
                       (append (operating-system-pam-services os)
                               (append-map service-pam-services services))))
-       (accounts    (operating-system-accounts os))
        (profile-drv (operating-system-profile os))
-       (groups   -> (append (operating-system-groups os)
-                            (append-map service-user-groups services))))
-   (etc-directory #:accounts accounts #:groups groups
-                  #:pam-services pam-services
+       (skeletons   (operating-system-skeletons os))
+       (/etc/hosts  (or (operating-system-hosts-file os)
+                        (default-/etc/hosts (operating-system-host-name os)))))
+   (etc-directory #:pam-services pam-services
+                  #:skeletons skeletons
+                  #:issue (operating-system-issue os)
                   #:locale (operating-system-locale os)
                   #:timezone (operating-system-timezone os)
+                  #:hosts-file /etc/hosts
                   #:sudoers (operating-system-sudoers os)
                   #:profile profile-drv)))
 
@@ -329,7 +476,8 @@ alias ll='ls -l'
     (list #~(string-append #$shadow "/bin/passwd")
           #~(string-append #$shadow "/bin/su")
           #~(string-append #$inetutils "/bin/ping")
-          #~(string-append #$sudo "/bin/sudo"))))
+          #~(string-append #$sudo "/bin/sudo")
+          #~(string-append #$fuse "/bin/fusermount"))))
 
 (define %sudoers-specification
   ;; Default /etc/sudoers contents: 'root' and all members of the 'wheel'
@@ -339,23 +487,82 @@ alias ll='ls -l'
   "root ALL=(ALL) ALL
 %wheel ALL=(ALL) ALL\n")
 
-(define (operating-system-boot-script os)
-  "Return the boot script for OS---i.e., the code started by the initrd once
-we're running in the final root."
+(define (user-group->gexp group)
+  "Turn GROUP, a <user-group> object, into a list-valued gexp suitable for
+'active-groups'."
+  #~(list #$(user-group-name group)
+          #$(user-group-password group)
+          #$(user-group-id group)
+          #$(user-group-system? group)))
+
+(define (user-account->gexp account)
+  "Turn ACCOUNT, a <user-account> object, into a list-valued gexp suitable for
+'activate-users'."
+  #~`(#$(user-account-name account)
+      #$(user-account-uid account)
+      #$(user-account-group account)
+      #$(user-account-supplementary-groups account)
+      #$(user-account-comment account)
+      #$(user-account-home-directory account)
+      ,#$(user-account-shell account)             ; this one is a gexp
+      #$(user-account-password account)
+      #$(user-account-system? account)))
+
+(define (modprobe-wrapper)
+  "Return a wrapper for the 'modprobe' command that knows where modules live.
+
+This wrapper is typically invoked by the Linux kernel ('call_modprobe', in
+kernel/kmod.c), a situation where the 'LINUX_MODULE_DIRECTORY' environment
+variable is not set---hence the need for this wrapper."
+  (let ((modprobe "/run/current-system/profile/bin/modprobe"))
+    (gexp->script "modprobe"
+                  #~(begin
+                      (setenv "LINUX_MODULE_DIRECTORY"
+                              "/run/booted-system/kernel/lib/modules")
+                      (apply execl #$modprobe
+                             (cons #$modprobe (cdr (command-line))))))))
+
+(define (operating-system-activation-script os)
+  "Return the activation script for OS---i.e., the code that \"activates\" the
+stateful part of OS, including user accounts and groups, special directories,
+etc."
   (define %modules
-    '((guix build activation)
-      (guix build utils)))
-
-  (mlet* %store-monad
-      ((services (operating-system-services os))
-       (etc      (operating-system-etc-directory os))
-       (modules  (imported-modules %modules))
-       (compiled (compiled-modules %modules))
-       (dmd-conf (dmd-configuration-file services)))
+    '((gnu build activation)
+      (gnu build linux-boot)
+      (gnu build linux-modules)
+      (gnu build file-systems)
+      (guix build utils)
+      (guix elf)))
+
+  (define (service-activations services)
+    ;; Return the activation scripts for SERVICES.
+    (let ((gexps (filter-map service-activate services)))
+      (sequence %store-monad (map (cut gexp->file "activate-service.scm" <>)
+                                  gexps))))
+
+  (mlet* %store-monad ((services (operating-system-services os))
+                       (actions  (service-activations services))
+                       (etc      (operating-system-etc-directory os))
+                       (modules  (imported-modules %modules))
+                       (compiled (compiled-modules %modules))
+                       (modprobe (modprobe-wrapper))
+                       (firmware (directory-union
+                                  "firmware" (operating-system-firmware os)))
+                       (accounts (operating-system-accounts os)))
     (define setuid-progs
       (operating-system-setuid-programs os))
 
-    (gexp->file "boot"
+    (define user-specs
+      (map user-account->gexp accounts))
+
+    (define groups
+      (append (operating-system-groups os)
+              (append-map service-user-groups services)))
+
+    (define group-specs
+      (map user-group->gexp groups))
+
+    (gexp->file "activate"
                 #~(begin
                     (eval-when (expand load eval)
                       ;; Make sure 'use-modules' below succeeds.
@@ -363,14 +570,57 @@ we're running in the final root."
                       (set! %load-compiled-path
                             (cons #$compiled %load-compiled-path)))
 
-                    (use-modules (guix build activation))
+                    (use-modules (gnu build activation))
+
+                    ;; Make sure /bin/sh is valid and current.
+                    (activate-/bin/sh
+                     (string-append #$(canonical-package bash)
+                                    "/bin/sh"))
 
                     ;; Populate /etc.
                     (activate-etc #$etc)
 
+                    ;; Add users and user groups.
+                    (setenv "PATH"
+                            (string-append #$(@ (gnu packages admin) shadow)
+                                           "/sbin"))
+                    (activate-users+groups (list #$@user-specs)
+                                           (list #$@group-specs))
+
                     ;; Activate setuid programs.
                     (activate-setuid-programs (list #$@setuid-progs))
 
+                    ;; Tell the kernel to use our 'modprobe' command.
+                    (activate-modprobe #$modprobe)
+
+                    ;; Tell the kernel where firmware is.
+                    (activate-firmware
+                     (string-append #$firmware "/lib/firmware"))
+
+                    ;; Run the services' activation snippets.
+                    ;; TODO: Use 'load-compiled'.
+                    (for-each primitive-load '#$actions)
+
+                    ;; Set up /run/current-system.
+                    (activate-current-system)))))
+
+(define (operating-system-boot-script os)
+  "Return the boot script for OS---i.e., the code started by the initrd once
+we're running in the final root."
+  (mlet* %store-monad ((services (operating-system-services os))
+                       (activate (operating-system-activation-script os))
+                       (dmd-conf (dmd-configuration-file services)))
+    (gexp->file "boot"
+                #~(begin
+                    ;; Activate the system.
+                    ;; TODO: Use 'load-compiled'.
+                    (primitive-load #$activate)
+
+                    ;; Keep track of the booted system.
+                    (false-if-exception (delete-file "/run/booted-system"))
+                    (symlink (readlink "/run/current-system")
+                             "/run/booted-system")
+
                     ;; Close any remaining open file descriptors to be on the
                     ;; safe side.  This must be the very last thing we do,
                     ;; because Guile has internal FDs such as 'sleep_pipe'
@@ -387,47 +637,97 @@ we're running in the final root."
 (define (operating-system-root-file-system os)
   "Return the root file system of OS."
   (find (match-lambda
-         (($ <file-system> _ "/") #t)
+         (($ <file-system> _ "/") #t)
          (_ #f))
         (operating-system-file-systems os)))
 
-(define (operating-system-derivation os)
-  "Return a derivation that builds OS."
+(define (operating-system-initrd-file os)
+  "Return a gexp denoting the initrd file of OS."
   (define boot-file-systems
-    (filter (match-lambda
-             (($ <file-system> device "/")
-              #t)
-             (($ <file-system> device mount-point type flags options boot?)
-              boot?))
+    (filter file-system-needed-for-boot?
             (operating-system-file-systems os)))
 
+  (define mapped-devices
+    (operating-system-boot-mapped-devices os))
+
+  (define make-initrd
+    (operating-system-initrd os))
+
+  (mlet %store-monad ((initrd (make-initrd boot-file-systems
+                                           #:mapped-devices mapped-devices)))
+    (return #~(string-append #$initrd "/initrd"))))
+
+(define (operating-system-locale-directory os)
+  "Return the directory containing the locales compiled for the definitions
+listed in OS.  The C library expects to find it under
+/run/current-system/locale."
+  ;; While we're at it, check whether the locale of OS is defined.
+  (unless (member (operating-system-locale os)
+                  (map locale-definition-name
+                       (operating-system-locale-definitions os)))
+    (raise (condition
+            (&message (message "system locale lacks a definition")))))
+
+  (locale-directory (operating-system-locale-definitions os)))
+
+(define (kernel->grub-label kernel)
+  "Return a label for the GRUB menu entry that boots KERNEL."
+  (string-append "GNU with "
+                 (string-titlecase (package-name kernel)) " "
+                 (package-version kernel)
+                 " (alpha)"))
+
+(define* (operating-system-grub.cfg os #:optional (old-entries '()))
+  "Return the GRUB configuration file for OS.  Use OLD-ENTRIES to populate the
+\"old entries\" menu."
   (mlet* %store-monad
-      ((profile     (operating-system-profile os))
-       (etc         (operating-system-etc-directory os))
-       (services    (operating-system-services os))
-       (boot        (operating-system-boot-script os))
-       (kernel  ->  (operating-system-kernel os))
-       (initrd      ((operating-system-initrd os) boot-file-systems))
-       (initrd-file -> #~(string-append #$initrd "/initrd"))
+      ((system      (operating-system-derivation os))
        (root-fs ->  (operating-system-root-file-system os))
+       (kernel ->   (operating-system-kernel os))
        (entries ->  (list (menu-entry
-                           (label (string-append
-                                   "GNU system with "
-                                   (package-full-name kernel)
-                                   " (technology preview)"))
+                           (label (kernel->grub-label kernel))
                            (linux kernel)
                            (linux-arguments
                             (list (string-append "--root="
                                                  (file-system-device root-fs))
-                                  #~(string-append "--load=" #$boot)))
-                           (initrd initrd-file))))
-       (grub.cfg (grub-configuration-file entries)))
+                                  #~(string-append "--system=" #$system)
+                                  #~(string-append "--load=" #$system
+                                                   "/boot")))
+                           (initrd #~(string-append #$system "/initrd"))))))
+    (grub-configuration-file (operating-system-bootloader os) entries
+                             #:old-entries old-entries)))
+
+(define (operating-system-parameters-file os)
+  "Return a file that describes the boot parameters of OS.  The primary use of
+this file is the reconstruction of GRUB menu entries for old configurations."
+  (mlet %store-monad ((initrd   (operating-system-initrd-file os))
+                      (root ->  (operating-system-root-file-system os))
+                      (label -> (kernel->grub-label
+                                 (operating-system-kernel os))))
+    (gexp->file "parameters"
+                #~(boot-parameters (version 0)
+                                   (label #$label)
+                                   (root-device #$(file-system-device root))
+                                   (kernel #$(operating-system-kernel os))
+                                   (initrd #$initrd)))))
+
+(define (operating-system-derivation os)
+  "Return a derivation that builds OS."
+  (mlet* %store-monad
+      ((profile     (operating-system-profile os))
+       (etc         (operating-system-etc-directory os))
+       (boot        (operating-system-boot-script os))
+       (kernel  ->  (operating-system-kernel os))
+       (initrd      (operating-system-initrd-file os))
+       (locale      (operating-system-locale-directory os))
+       (params      (operating-system-parameters-file os)))
     (file-union "system"
                 `(("boot" ,#~#$boot)
                   ("kernel" ,#~#$kernel)
-                  ("initrd" ,initrd-file)
+                  ("parameters" ,#~#$params)
+                  ("initrd" ,initrd)
                   ("profile" ,#~#$profile)
-                  ("grub.cfg" ,#~#$grub.cfg)
+                  ("locale" ,#~#$locale)          ;used by libc
                   ("etc" ,#~#$etc)))))
 
 ;;; system.scm ends here