build-aux/hydra/evaluate.scm

   1 ;;; GNU Guix --- Functional package management for GNU
   2 ;;; Copyright © 2016, 2017, 2018 Ludovic Courtès <ludo@gnu.org>
   3 ;;; Copyright © 2017 Jan Nieuwenhuizen <janneke@gnu.org>
   4 ;;;
   5 ;;; This file is part of GNU Guix.
   6 ;;;
   7 ;;; GNU Guix is free software; you can redistribute it and/or modify it
   8 ;;; under the terms of the GNU General Public License as published by
   9 ;;; the Free Software Foundation; either version 3 of the License, or (at
  10 ;;; your option) any later version.
  11 ;;;
  12 ;;; GNU Guix is distributed in the hope that it will be useful, but
  13 ;;; WITHOUT ANY WARRANTY; without even the implied warranty of
  14 ;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 ;;; GNU General Public License for more details.
  16 ;;;
  17 ;;; You should have received a copy of the GNU General Public License
  18 ;;; along with GNU Guix.  If not, see <http://www.gnu.org/licenses/>.
  19
  20 ;;; This program replicates the behavior of Hydra's 'hydra-eval-guile-job'.
  21 ;;; It evaluates the Hydra job defined by the program passed as its first
  22 ;;; arguments and outputs an sexp of the jobs on standard output.
  23
  24 (use-modules (guix store)
  25              (guix git-download)
  26              ((guix build utils) #:select (with-directory-excursion))
  27              (srfi srfi-19)
  28              (ice-9 match)
  29              (ice-9 pretty-print)
  30              (ice-9 format))
  31
  32 (define %top-srcdir
  33   (and=> (assq-ref (current-source-location) 'filename)
  34          (lambda (file)
  35            (canonicalize-path
  36             (string-append (dirname file) "/../..")))))
  37
  38 (define %user-module
  39   ;; Hydra user module.
  40   (let ((m (make-module)))
  41     (beautify-user-module! m)
  42     m))
  43
  44 (cond-expand
  45   (guile-2.2
  46    ;; Guile 2.2.2 has a bug whereby 'time-monotonic' objects have seconds and
  47    ;; nanoseconds swapped (fixed in Guile commit 886ac3e).  Work around it.
  48    (define time-monotonic time-tai))
  49   (else #t))
  50
  51 (define (call-with-time thunk kont)
  52   "Call THUNK and pass KONT the elapsed time followed by THUNK's return
  53 values."
  54   (let* ((start  (current-time time-monotonic))
  55          (result (call-with-values thunk list))
  56          (end    (current-time time-monotonic)))
  57     (apply kont (time-difference end start) result)))
  58
  59 (define (call-with-time-display thunk)
  60   "Call THUNK and write to the current output port its duration."
  61   (call-with-time thunk
  62     (lambda (time . results)
  63       (format #t "~,3f seconds~%"
  64               (+ (time-second time)
  65                  (/ (time-nanosecond time) 1e9)))
  66       (apply values results))))
  67
  68 (define (assert-valid-job job thing)
  69   "Raise an error if THING is not an alist with a valid 'derivation' entry.
  70 Otherwise return THING."
  71   (unless (and (list? thing)
  72                (and=> (assoc-ref thing 'derivation)
  73                       (lambda (value)
  74                         (and (string? value)
  75                              (string-suffix? ".drv" value)))))
  76     (error "job did not produce a valid alist" job thing))
  77   thing)
  78
  79 \f
  80 ;; Without further ado...
  81 (match (command-line)
  82   ((command file cuirass? ...)
  83    ;; Load FILE, a Scheme file that defines Hydra jobs.
  84    (let ((port (current-output-port))
  85          (real-build-things build-things))
  86      (with-store store
  87        ;; Make sure we don't resort to substitutes.
  88        (set-build-options store
  89                           #:use-substitutes? #f
  90                           #:substitute-urls '())
  91
  92        ;; Grafts can trigger early builds.  We do not want that to happen
  93        ;; during evaluation, so use a sledgehammer to catch such problems.
  94        ;; An exception, though, is the evaluation of Guix itself, which
  95        ;; requires building a "trampoline" program.
  96        (set! build-things
  97          (lambda (store . args)
  98            (format (current-error-port)
  99                    "warning: building things during evaluation~%")
 100            (format (current-error-port)
 101                    "'build-things' arguments: ~s~%" args)
 102            (apply real-build-things store args)))
 103
 104        ;; Add %TOP-SRCDIR to the store with a proper Git predicate so we work
 105        ;; from a clean checkout
 106        (let ((source (add-to-store store "guix-source" #t
 107                                    "sha256" %top-srcdir
 108                                    #:select? (git-predicate %top-srcdir))))
 109          (with-directory-excursion source
 110            (save-module-excursion
 111             (lambda ()
 112               (set-current-module %user-module)
 113               (format (current-error-port)
 114                       "loading '~a' relative to '~a'...~%"
 115                       file source)
 116               (primitive-load file))))
 117
 118          ;; Call the entry point of FILE and print the resulting job sexp.
 119          (pretty-print
 120           (match ((module-ref %user-module
 121                               (if (equal? cuirass? "cuirass")
 122                                   'cuirass-jobs
 123                                   'hydra-jobs))
 124                   store `((guix
 125                            . ((file-name . ,source)))))
 126             (((names . thunks) ...)
 127              (map (lambda (job thunk)
 128                     (format (current-error-port) "evaluating '~a'... " job)
 129                     (force-output (current-error-port))
 130                     (cons job
 131                           (assert-valid-job job
 132                                             (call-with-time-display thunk))))
 133                   names thunks)))
 134           port)))))
 135   ((command _ ...)
 136    (format (current-error-port) "Usage: ~a FILE [cuirass]
 137 Evaluate the Hydra or Cuirass jobs defined in FILE.~%"
 138            command)
 139    (exit 1)))
 140
 141 ;;; Local Variables:
 142 ;;; eval: (put 'call-with-time 'scheme-indent-function 1)
 143 ;;; End:
 144