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;;; GNU Guix --- Functional package management for GNU
;;; Copyright © 2013 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 (guix scripts pull)
#:use-module (guix ui)
#:use-module (guix store)
#:use-module (guix config)
#:use-module (guix packages)
#:use-module (guix derivations)
#:use-module (guix download)
#:use-module (gnu packages base)
#:use-module ((gnu packages bootstrap)
#:select (%bootstrap-guile))
#:use-module (gnu packages compression)
#:use-module (gnu packages gnupg)
#:use-module (srfi srfi-1)
#:use-module (srfi srfi-37)
#:export (guix-pull))
(define %snapshot-url
;; "http://hydra.gnu.org/job/guix/master/tarball/latest/download"
"http://git.savannah.gnu.org/cgit/guix.git/snapshot/guix-master.tar.gz"
)
(define (unpack store tarball)
"Return a derivation that unpacks TARBALL into STORE and compiles Scheme
files."
(define builder
`(begin
(use-modules (guix build utils)
(system base compile)
(ice-9 ftw)
(ice-9 match)
(srfi srfi-1)
(srfi srfi-11)
(srfi srfi-26))
(setvbuf (current-output-port) _IOLBF)
(setvbuf (current-error-port) _IOLBF)
(let ((out (assoc-ref %outputs "out"))
(tar (assoc-ref %build-inputs "tar"))
(gzip (assoc-ref %build-inputs "gzip"))
(gcrypt (assoc-ref %build-inputs "gcrypt"))
(tarball (assoc-ref %build-inputs "tarball")))
(define (call-with-process thunk)
;; Run THUNK in a separate process that will return 0 if THUNK
;; terminates normally, and 1 if an exception is raised.
(match (primitive-fork)
(0
(catch #t
(lambda ()
(thunk)
(primitive-exit 0))
(lambda (key . args)
(print-exception (current-error-port) #f key args)
(primitive-exit 1))))
(pid
#t)))
(define (p-for-each proc lst)
;; Invoke PROC for each element of LST in a separate process.
;; Raise an error if one of the processes exit with non-zero.
(define (wait-for-one-process)
(match (waitpid WAIT_ANY)
((_ . status)
(unless (zero? (status:exit-val status))
(error "process failed" proc status)))))
(define max-processes
(current-processor-count))
(let loop ((lst lst)
(running 0))
(match lst
(()
(or (zero? running)
(begin
(wait-for-one-process)
(loop lst (- running 1)))))
((head . tail)
(if (< running max-processes)
(begin
(call-with-process (cut proc head))
(loop tail (+ running 1)))
(begin
(wait-for-one-process)
(loop lst (- running 1))))))))
(setenv "PATH" (string-append tar "/bin:" gzip "/bin"))
(system* "tar" "xvf" tarball)
(match (scandir "." (lambda (name)
(and (not (member name '("." "..")))
(file-is-directory? name))))
((dir)
(chdir dir))
(x
(error "tarball did not produce a single source directory" x)))
(format #t "copying and compiling Guix to `~a'...~%" out)
;; Copy everything under guix/ and gnu/ plus guix.scm.
(copy-recursively "guix" (string-append out "/guix"))
(copy-recursively "gnu" (string-append out "/gnu"))
(copy-file "guix.scm" (string-append out "/guix.scm"))
;; Add a fake (guix config) module to allow the other modules to be
;; compiled. The user's (guix config) is the one that will be used.
(copy-file "guix/config.scm.in"
(string-append out "/guix/config.scm"))
(substitute* (string-append out "/guix/config.scm")
(("@LIBGCRYPT@")
(string-append gcrypt "/lib/libgcrypt")))
;; Augment the search path so Scheme code can be compiled.
(set! %load-path (cons out %load-path))
(set! %load-compiled-path (cons out %load-compiled-path))
;; Compile the .scm files. Do that in independent processes, à la
;; 'make -j', to work around <http://bugs.gnu.org/15602> (FIXME).
;; This ensures correctness, but is overly conservative and slow.
;; The solution initially implemented (and described in the bug
;; above) was slightly faster but consumed memory proportional to the
;; number of modules, which quickly became unacceptable.
(p-for-each (lambda (file)
(let ((go (string-append (string-drop-right file 4)
".go")))
(format (current-error-port)
"compiling '~a'...~%" file)
(compile-file file
#:output-file go
#:opts
%auto-compilation-options)))
(filter (cut string-suffix? ".scm" <>)
;; Build guix/*.scm before gnu/*.scm to speed
;; things up.
(sort (find-files out "\\.scm")
(let ((guix (string-append out "/guix"))
(gnu (string-append out "/gnu")))
(lambda (a b)
(or (and (string-prefix? guix a)
(string-prefix? gnu b))
(string<? a b)))))))
;; Remove the "fake" (guix config).
(delete-file (string-append out "/guix/config.scm"))
(delete-file (string-append out "/guix/config.go")))))
(build-expression->derivation store "guix-latest" builder
#:inputs
`(("tar" ,(package-derivation store tar))
("gzip" ,(package-derivation store gzip))
("gcrypt" ,(package-derivation store
libgcrypt))
("tarball" ,tarball))
#:modules '((guix build utils))))
;;;
;;; Command-line options.
;;;
(define %default-options
;; Alist of default option values.
`((tarball-url . ,%snapshot-url)))
(define (show-help)
(display (_ "Usage: guix pull [OPTION]...
Download and deploy the latest version of Guix.\n"))
(display (_ "
--verbose produce verbose output"))
(display (_ "
--url=URL download the Guix tarball from URL"))
(display (_ "
--bootstrap use the bootstrap Guile to build the new Guix"))
(newline)
(display (_ "
-h, --help display this help and exit"))
(display (_ "
-V, --version display version information and exit"))
(newline)
(show-bug-report-information))
(define %options
;; Specifications of the command-line options.
(list (option '("verbose") #f #f
(lambda (opt name arg result)
(alist-cons 'verbose? #t result)))
(option '("url") #t #f
(lambda (opt name arg result)
(alist-cons 'tarball-url arg
(alist-delete 'tarball-url result))))
(option '("bootstrap") #f #f
(lambda (opt name arg result)
(alist-cons 'bootstrap? #t result)))
(option '(#\h "help") #f #f
(lambda args
(show-help)
(exit 0)))
(option '(#\V "version") #f #f
(lambda args
(show-version-and-exit "guix pull")))))
(define (guix-pull . args)
(define (parse-options)
;; Return the alist of option values.
(args-fold* args %options
(lambda (opt name arg result)
(leave (_ "~A: unrecognized option~%") name))
(lambda (arg result)
(leave (_ "~A: unexpected argument~%") arg))
%default-options))
(with-error-handling
(let* ((opts (parse-options))
(store (open-connection))
(url (assoc-ref opts 'tarball-url)))
(let ((tarball (download-to-store store url "guix-latest.tar.gz")))
(unless tarball
(leave (_ "failed to download up-to-date source, exiting\n")))
(parameterize ((%guile-for-build
(package-derivation store
(if (assoc-ref opts 'bootstrap?)
%bootstrap-guile
guile-final)))
(current-build-output-port
(if (assoc-ref opts 'verbose?)
(current-error-port)
(%make-void-port "w"))))
(let* ((config-dir (config-directory))
(source (unpack store tarball))
(source-dir (derivation->output-path source)))
(if (show-what-to-build store (list source))
(if (build-derivations store (list source))
(let ((latest (string-append config-dir "/latest")))
(add-indirect-root store latest)
(switch-symlinks latest source-dir)
(format #t
(_ "updated ~a successfully deployed under `~a'~%")
%guix-package-name latest)
#t)
(leave (_ "failed to update Guix, check the build log~%")))
(begin
(display (_ "Guix already up to date\n"))
#t))))))))
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