#!/bin/sh
# -*- scheme -*-
exec ${GUILE:-@GUILE@} --no-auto-compile -e main -s "$0" "$@"
!#
;;; cuirass -- continuous integration tool
;;; Copyright © 2016 Mathieu Lirzin <mthl@gnu.org>
;;;
;;; This file is part of Cuirass.
;;;
;;; Cuirass 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.
;;;
;;; Cuirass 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 Cuirass.  If not, see <http://www.gnu.org/licenses/>.

(use-modules (cuirass base)
             (cuirass config)
             (cuirass database)
             (cuirass ui)
             (cuirass utils)
             (guix derivations)
             (guix store)
             (ice-9 getopt-long)
             (ice-9 popen))

(define (show-help)
  (format #t "Usage: ~a [OPTIONS] SPECFILE~%" (%program-name))
  (display "Run build jobs from SPECFILE.

      --one-shot            Evaluate and build jobs only once
      --cache-directory=DIR Use DIR for storing repository data
  -D  --database=DB         Use DB to store build results.
  -I, --interval=N          Wait N seconds between each evaluation
  -V, --version             Display version
  -h, --help                Display this help message")
  (newline)
  (show-package-information))

(define %options
  '((one-shot                   (value #f))
    (cache-directory            (value #t))
    (database (single-char #\D) (value #t))
    (interval (single-char #\I) (value #t))
    (version  (single-char #\V) (value #f))
    (help     (single-char #\h) (value #f))))

(define (fetch-repository spec)
  "Get the latest version of repository specified in SPEC.  Clone repository
if required."
  (let ((cachedir (%package-cachedir)))
    (or (file-exists? cachedir) (mkdir cachedir))
    (with-directory-excursion cachedir
      (let ((name   (assq-ref spec #:name))
            (url    (assq-ref spec #:url))
            (branch (assq-ref spec #:branch))
            (commit (assq-ref spec #:commit))
            (tag    (assq-ref spec #:tag)))
        (or (file-exists? name) (system* "git" "clone" url name))
        (with-directory-excursion name
          (and (zero? (system* "git" "fetch"))
               (zero? (system* "git" "reset" "--hard"
                               (or tag
                                   commit
                                   (string-append "origin/" branch))))))))))

(define (compile dir)
  ;; Required for fetching Guix bootstrap tarballs.
  "Compile files in repository in directory DIR."
  (with-directory-excursion dir
    (or (file-exists? "configure") (system* "./bootstrap"))
    (or (file-exists? "Makefile")
        (system* "./configure" "--localstatedir=/var"))
    (zero? (system* "make" "-j" (number->string (current-processor-count))))))

(define (evaluate store db spec)
  "Evaluate and build package derivations.  Return a list of jobs."
  (let* ((port (open-pipe* OPEN_READ
                           "evaluate"
                           (string-append (%package-cachedir) "/"
                                          (assq-ref spec #:name) "/"
                                          (assq-ref spec #:load-path))
                           (%package-cachedir)
                           (object->string spec)
                           (%package-database)))
         (jobs (read port)))
    (close-pipe port)
    jobs))

(define (build-packages store db jobs)
  "Build JOBS which is a list of <job> objects."
  (map (λ (job)
         (let ((log-port (tmpfile))
               (name     (assq-ref job #:job-name))
               (drv      (assq-ref job #:derivation)))
           (setvbuf log-port _IOLBF)
           (format #t "building ~A...~%" drv)
           (parameterize ((current-build-output-port log-port))
             (build-derivations store (list drv))
             ;; XXX: 'Builds' database table is not implemented yet.
             ;; (db-add-build-log db job log-port)
             (close-port log-port))
           (format #t "~A~%" (derivation-path->output-path drv))))
       jobs))

(define (process-specs db jobspecs)
  "Evaluate and build JOBSPECS and store results in DB."
  (for-each (λ (spec)
              (fetch-repository spec)
              (compile (string-append (%package-cachedir) "/"
                                      (assq-ref spec #:name)))
              (with-store store
                (let ((jobs (evaluate store db spec)))
                  (set-build-options store #:use-substitutes? #f)
                  (build-packages store db jobs))))
            jobspecs))


;;;
;;; Entry point.
;;;

(define* (main #:optional (args (command-line)))
  (let* ((opts     (getopt-long args %options))
         (specfile (option-ref opts '() '())))
    (parameterize
        ((%program-name     (car args))
         (%package-database (option-ref opts 'database (%package-database)))
         (%package-cachedir
          (option-ref opts 'cache-directory (%package-cachedir))))
      (cond
       ((option-ref opts 'help #f)
        (show-help)
        (exit 0))
       ((option-ref opts 'version #f)
        (show-version)
        (exit 0))
       ((null? specfile)
        (display "You must provide a specification file as argument.")
        (newline)
        (exit 1))
       (else
        (let ((one-shot? (option-ref opts 'one-shot #f))
              (interval  (string->number (option-ref opts 'interval "60")))
              (specs     (save-module-excursion
                          (λ ()
                            (set-current-module (make-user-module))
                            (primitive-load (car specfile))))))
          (with-database db
            (for-each (λ (spec) (db-add-specification db spec)) specs)
            (let ((specs* (db-get-specifications db)))
              (if one-shot?
                  (process-specs db specs*)
                  (while #t
                    (process-specs db specs*)
                    (sleep interval)))))))))))