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;;; GNU Guix --- Functional package management for GNU
;;; Copyright © 2016, 2018-2020, 2022 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/>.

(use-modules (gnu tests)
             (gnu packages package-management)
             (guix monads)
             (guix store)
             ((guix git-download) #:select (git-predicate))
             ((guix utils) #:select (current-source-directory))
             (git)
             (ice-9 match))

(define (source-commit directory)
  "Return the commit of the head of DIRECTORY or #f if it could not be
determined."
  (let ((repository #f))
    (catch 'git-error
      (lambda ()
        (set! repository (repository-open directory))
        (let* ((head   (repository-head repository))
               (target (reference-target head))
               (commit (oid->string target)))
          (repository-close! repository)
          commit))
      (lambda _
        (when repository
          (repository-close! repository))
        #f))))

(define (tests-for-current-guix source commit)
  "Return a list of tests for perform, using Guix built from SOURCE, a channel
instance."
  ;; Honor the 'TESTS' environment variable so that one can select a subset
  ;; of tests to run in the usual way:
  ;;
  ;;   make check-system TESTS=installed-os
  (let ((guix (channel-source->package source #:commit commit)))
    (map (lambda (test)
           (system-test
            (inherit test)
            (value (mparameterize %store-monad ((current-guix-package guix))
                     (system-test-value