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;;; GNU Guix --- Functional package management for GNU
;;; Copyright © 2013, 2014 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 (ice-9 format)
#: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* (report-build-progress total completed cont
#:optional (log-port (current-error-port)))
"Report that COMPLETED out of TOTAL files have been completed, and call
CONT."
(display #\cr log-port)
(format log-port "compiling...\t~5,1f% of ~d files" ;FIXME: i18n
(* 100. (/ completed total)) total)
(force-output log-port)
(cont))
(define* (p-for-each proc lst
#:optional (max-processes (current-processor-count))
#:key (progress report-build-progress))
"Invoke PROC for each element of LST in a separate process, using up to
MAX-PROCESSES processes in parallel. Call PROGRESS at each step, passing it
the continuation. Raise an error if one of the processes exit with non-zero."
(define total
(length lst))
(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)
(completed 0))
(match lst
(()
(or (zero? running)
(let ((running (- running 1))
(completed (+ completed 1)))
(wait-for-one-process)
(progress total completed
(lambda ()
(loop lst running completed))))))
((head . tail)
(if (< running max-processes)
(let ((running (+ 1 running)))
(call-with-process (cut proc head))
(progress total completed
(lambda ()
(loop tail running completed))))
(let ((running (- running 1))
(completed (+ completed 1)))
(wait-for-one-process)
(progress total completed
(lambda ()
(loop lst running completed)))))))))
(define* (build-guix out source
#:key gcrypt
(debug-port (%make-void-port "w")))
"Build and install Guix in directory OUT using SOURCE, a directory
containing the source code. Write any debugging output to DEBUG-PORT."
(setvbuf (current-output-port) _IOLBF)
(setvbuf (current-error-port) _IOLBF)
(with-directory-excursion source
(format #t "copying and compiling to '~a'...~%" out)
;; Copy everything under guix/ and gnu/ plus {guix,gnu}.scm.
(copy-recursively "guix" (string-append out "/guix")
#:log debug-port)
(copy-recursively "gnu" (string-append out "/gnu")
#:log debug-port)
(copy-file "guix.scm" (string-append out "/guix.scm"))
(copy-file "gnu.scm" (string-append out "/gnu.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 debug-port "~%compiling '~a'...~%" file)
(parameterize ((current-warning-port debug-port))
(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"))
(newline)
#t)
;;; pull.scm ends here
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