;;; GNU Guix --- Functional package management for GNU ;;; Copyright © 2016, 2017 Ludovic Courtès ;;; ;;; 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 . (define-module (test-scripts-build) #:use-module (guix tests) #:use-module (guix store) #:use-module (guix packages) #:use-module (guix scripts build) #:use-module (guix ui) #:use-module (guix utils) #:use-module (gnu packages) #:use-module (gnu packages base) #:use-module (gnu packages busybox) #:use-module (ice-9 match) #:use-module (srfi srfi-64)) (test-begin "scripts-build") (test-assert "options->transformation, no transformations" (let ((p (dummy-package "foo")) (t (options->transformation '()))) (with-store store (eq? (t store p) p)))) (test-assert "options->transformation, with-source" ;; Our pseudo-package is called 'guix.scm' so the 'guix.scm' source should ;; be applicable. (let* ((p (dummy-package "guix.scm")) (s (search-path %load-path "guix.scm")) (t (options->transformation `((with-source . ,s))))) (with-store store (let ((new (t store p))) (and (not (eq? new p)) (string=? (package-source new) (add-to-store store "guix.scm" #t "sha256" s))))))) (test-assert "optio
;;; GNU Guix --- Functional package management for GNU
;;; Copyright © 2013, 2014, 2015, 2018, 2020 Ludovic Courtès <ludo@gnu.org>
;;;
;;; 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 linux-initrd)
  #:use-module ((guix cpio) #:prefix cpio:)
  #:use-module (guix build utils)
  #:use-module (guix build store-copy)
  #:use-module (system base compile)
  #:use-module (rnrs bytevectors)
  #:use-module ((system foreign) #:select (sizeof))
  #:use-module (ice-9 ftw)
  #:export (write-cpio-archive
            build-initrd))

;;; Commentary:
;;;
;;; Tools to create Linux initial RAM disks ("initrds").  Initrds are
;;; essentially gzipped cpio archives, with a '/init' executable that the
;;; kernel runs at boot time.
;;;
;;; Code:

(define* (write-cpio-archive output directory
                             #:key
                             (compress? #t)
                             (gzip "gzip"))
  "Write a cpio archive containing DIRECTORY to file OUTPUT, with reset
timestamps in the archive.  When COMPRESS? is true, compress it using GZIP.
On success, return OUTPUT."

  ;; Note: as per `ramfs-rootfs-initramfs.txt', always add directory entries
  ;; before the files that are inside of it: "The Linux kernel cpio
  ;; extractor won't create files in a directory that doesn't exist, so the
  ;; directory entries must go before the files that go in those
  ;; directories."

  (define files
    ;; Use 'sort' so that (1) the order of files is deterministic, and (2)
    ;; directories appear before the files they contain.
    (sort (file-system-fold (const #t)                 ;enter?
                            (lambda (file stat result) ;leaf
                              (cons file result))
                            (lambda (dir stat result)  ;down
                              (if (string=? dir directory)
                                  result
                                  (cons dir result)))
                            (lambda (file stat result)
                              result)
                            (const #f)                 ;skip
                            (const #f)                 ;error
                            '()
                            directory)
          string<?))

  (call-with-output-file output
    (lambda (port)
      (cpio:write-cpio-archive files port
                               #:file->header cpio:file->cpio-header*)))

  (if compress?
      ;; Gzip insists on adding a '.gz' suffix and does nothing if the input
      ;; file already has that suffix.  Shuffle files around to placate it.
      (let* ((gz-suffix? (string-suffix? ".gz" output))
             (sans-gz    (if gz-suffix?
                             (string-drop-right output 3)
                             output)))
        (when gz-suffix?
          (rename-file output sans-gz))
        ;; Use '--no-name' so that gzip records neither a file name nor a time
        ;; stamp in its output.
        (and (zero? (system* gzip "--best" "--no-name" sans-gz))
             (begin
               (unless gz-suffix?
                 (rename-file (string-append output ".gz") output))
               output)))