;;; GNU Guix --- Functional package management for GNU
;;; Copyright © 2013, 2014, 2015, 2016, 2017, 2018, 2019 Ludovic Courtès <ludo@gnu.org>
;;; Copyright © 2016 Chris Marusich <cmmarusich@gmail.com>
;;;
;;; This file is part of GNU Guix.
;;;
;;; GNU Guix is free software; you can redistribute it and/or modify it
;;; under the terms of the GNU General Public License as published by
;;; the Free Software Foundation; either version 3 of the License, or (at
;;; your option) any later version.
;;;
;;; GNU Guix is distributed in the hope that it will be useful, but
;;; WITHOUT ANY WARRANTY; without even the implied warranty of
;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
;;; GNU General Public License for more details.
;;;
;;; You should have received a copy of the GNU General Public License
;;; along with GNU Guix.  If not, see <http://www.gnu.org/licenses/>.

(define-module (gnu build install)
  #:use-module (guix build utils)
  #:use-module (guix build store-copy)
  #:use-module (srfi</td></tr></table>
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  ("/var/guix/gcroots/booted-system" -> "/run/booted-system")
    ("/var/guix/gcroots/current-system" -> "/run/current-system")
    ("/var/guix/gcroots/profiles" -> "/var/guix/profiles")

    (directory "/bin")
    (directory "/tmp" 0 0 #o1777)                 ; sticky bit
    (directory "/var/tmp" 0 0 #o1777)
    (directory "/var/lock" 0 0 #o1777)

    (directory "/home" 0 0)))

(define (populate-root-file-system system target)
  "Make the essential non-store files and directories on TARGET.  This
includes /etc, /var, /run, /bin/sh, etc., and all the symlinks to SYSTEM."
  (for-each (cut evaluate-populate-directive <> target)
            (directives (%store-directory)))

  ;; Add system generation 1.
  (let ((generation-1 (string-append target
                                     "/var/guix/profiles/system-1-link")))
    (let try ()
      (catch 'system-error
        (lambda ()
          (symlink system generation-1))
        (lambda args
          ;; If GENERATION-1 already exists, overwrite it.
          (if (= EEXIST (system-error-errno args))
              (begin
                (delete-file generation-1)
                (try))
              (apply throw args)))))))

(define %root-profile
  "/var/guix/profiles/per-user/root")

(define* (install-database-and-gc-roots root database profile
                                        #:key (profile-name "guix-profile"))
  "Install DATABASE, the store database, under directory ROOT.  Create
PROFILE-NAME and have it link to PROFILE, a store item."
  (define (scope file)
    (string-append root "/" file))

  (define (mkdir-p* dir)
    (mkdir-p (scope dir)))

  (define (symlink* old new)
    (symlink old (scope new)))

  (install-file database (scope "/var/guix/db/"))
  (chmod (scope "/var/guix/db/db.sqlite") #o644)
  (mkdir-p* "/var/guix/profiles")
  (mkdir-p* "/var/guix/gcroots")
  (symlink* "/var/guix/profiles" "/var/guix/gcroots/profiles")

  ;; Make root's profile, which makes it a GC root.
  (mkdir-p* %root-profile)
  (symlink* profile
            (string-append %root-profile "/" profile-name "-1-link"))
  (symlink* (string-append profile-name "-1-link")
            (string-append %root-profile "/" profile-name)))

(define* (populate-single-profile-directory directory
                                            #:key profile closure
                                            (profile-name "guix-profile")
                                            database)
  "Populate DIRECTORY with a store containing PROFILE, whose closure is given
in the file called CLOSURE (as generated by #:references-graphs.)  DIRECTORY
is initialized to contain a single profile under /root pointing to PROFILE.

When DATABASE is true, copy it to DIRECTORY/var/guix/db and create
DIRECTORY/var/guix/gcroots and friends.

PROFILE-NAME is the name of the profile being created under
/var/guix/profiles, typically either \"guix-profile\" or \"current-guix\".

This is used to create the self-contained tarballs with 'guix pack'."
  (define (scope file)
    (string-append directory "/" file))

  (define (mkdir-p* dir)
    (mkdir-p (scope dir)))

  (define (symlink* old new)
    (symlink old (scope new)))

  ;; Populate the store.
  (populate-store (list closure) directory)

  (when database
    (install-database-and-gc-roots directory database profile
                                   #:profile-name profile-name))

  (match profile-name
    ("guix-profile"
     (mkdir-p* "/root")
     (symlink* (string-append %root-profile "/guix-profile")
               "/root/.guix-profile"))
    ("current-guix"
     (mkdir-p* "/root/.config/guix")
     (symlink* (string-append %root-profile "/current-guix")
               "/root/.config/guix/current"))
    (_
     #t)))

;;; install.scm ends here