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;;; Guix Build Coordinator
;;;
;;; Copyright © 2020 Christopher Baines <mail@cbaines.net>
;;;
;;; This file is part of the guix-build-coordinator.
;;;
;;; The Guix Build Coordinator 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.
;;;
;;; The Guix Build Coordinator 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 the guix-data-service.  If not, see
;;; <http://www.gnu.org/licenses/>.

(define-module (guix-build-coordinator hooks)
  #:use-module (srfi srfi-1)
  #:use-module (ice-9 match)
  #:use-module (gcrypt pk-crypto)
  #:use-module (guix pki)
  #:use-module (guix config)
  #:use-module (guix build utils)
  #:use-module (guix-build-coordinator utils)
  #:use-module (guix-build-coordinator datastore)
  #:use-module (guix-build-coordinator coordinator)
  #:export (default-build-success-hook
            build-success-publish-hook
            default-build-failure-hook
            default-build-missing-inputs-hook))

(define (default-build-success-hook datastore build-id)
  (let ((agent-id
         (datastore-agent-for-build datastore build-id)))
    (display
     (simple-format #f
                    "build ~A succeeded (on agent ~A)\n"
                    build-id agent-id)
     (current-error-port))))


(define* (build-success-publish-hook
          publish-directory
          #:key
          (public-key  (read-file-sexp %public-key-file))
          (private-key (read-file-sexp %private-key-file)))
  (mkdir-p (string-append publish-directory "/nar/lzip"))

  (lambda (datastore build-id)
    (let* ((build-details
            (datastore-find-build datastore build-id))
           (derivation-name
            (assq-ref build-details 'derivation-name)))
      (for-each
       (lambda (output)
         (let* ((output-name
                 (assq-ref output 'name))
                (output-filename
                 (assq-ref output 'output))
                (nar-location
                 (build-output-file-location datastore build-id
                                             output-name))
                (nar-destination
                 (string-append publish-directory
                                "/nar/lzip/"
                                (basename output-filename)))
                (narinfo-location
                 (string-append publish-directory
                                "/"
                                (string-take (basename output-filename) 32)
                                ".narinfo")))

           (copy-file nar-location nar-destination)

           (call-with-output-file narinfo-location
             (lambda (port)
               (display (narinfo-string
                         output-filename
                         (assq-ref output 'hash)
                         (assq-ref output 'size)
                         (vector->list
                          (assq-ref output 'references))
                         `((lzip ,(stat:size (stat nar-location #f))))
                         #:system (datastore-find-derivation-system
                                   datastore
                                   derivation-name)
                         #:derivation derivation-name
                         #:public-key public-key
                         #:private-key private-key)
                        port)))))
       (datastore-list-build-outputs datastore build-id)))))

(define (default-build-failure-hook datastore build-id)
  (let ((agent-id
         (datastore-agent-for-build datastore build-id)))
    (display
     (simple-format #f
                    "build ~A failed (on agent ~A)\n"
                    build-id agent-id)
     (current-error-port))))

(define (default-build-missing-inputs-hook datastore build-id missing-inputs)
  (let ((build (datastore-find-build datastore build-id)))
    (let ((derivation-inputs
           (datastore-find-derivation-inputs datastore
                                             (assq-ref build 'derivation-name))))
      (simple-format #t "missing-inputs: ~A\n~A\n"
                     build-id
                     (string-join (map (lambda (input)
                                         (string-append " - " input))
                                       missing-inputs)
                                  "\n"))
      (for-each (lambda (missing-input)
                  (let ((input-derivation
                         (any (lambda (derivation-input)
                                (if (string=? (assq-ref derivation-input 'output)
                                              missing-input)
                                    (assq-ref derivation-input 'derivation)
                                    #f))
                              derivation-inputs)))
                    (unless input-derivation
                      (error "couldn't find a derivation for " missing-input))

                    (let ((builds-for-output
                           (datastore-list-builds-for-output datastore
                                                             missing-input)))
                      (if (null? builds-for-output)
                          (begin
                            (simple-format #t
                                           "submitting build for ~A\n"
                                           input-derivation)
                            (submit-build datastore input-derivation))
                          (simple-format #t "~A builds exist for ~A, skipping\n"
                                         (length builds-for-output)
                                         missing-input)))))
                missing-inputs))))