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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 build pull)
#:use-module (guix build utils)
#:use-module (system base compile)
#:use-module (ice-9 ftw)
#:use-module (ice-9 match)
#:use-module (srfi srfi-1)
#:use-module (srfi srfi-11)
#:use-module (srfi srfi-26)
#:export (build-guix))
;;; Commentary:
;;;
;;; Helpers for the 'guix pull' command to unpack and build Guix.
;;;
;;; Code:
(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
#:optional (max-processes (current-processor-count)))
"Invoke PROC for each element of LST in a separate process, using up to
MAX-PROCESSES processes in parallel. 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)))))
(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))))))))
(define* (build-guix out tarball
#:key tar gzip gcrypt)
"Build and install Guix in directory OUT using source from TARBALL."
(setvbuf (current-output-port) _IOLBF)
(setvbuf (current-error-port) _IOLBF)
(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"))
#t)
;;; pull.scm ends here
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