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;;; GNU Guix --- Functional package management for GNU
;;; Copyright © 2013, 2014, 2015 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 tests)
#:use-module (guix store)
#:use-module (guix derivations)
#:use-module (guix packages)
#:use-module (guix base32)
#:use-module (guix serialization)
#:use-module (guix hash)
#:use-module (guix build-system gnu)
#:use-module (gnu packages bootstrap)
#:use-module (srfi srfi-34)
#:use-module (rnrs bytevectors)
#:use-module (web uri)
#:export (open-connection-for-tests
random-text
random-bytevector
network-reachable?
shebang-too-long?
mock
%substitute-directory
with-derivation-narinfo
with-derivation-substitute
dummy-package))
;;; Commentary:
;;;
;;; This module provide shared infrastructure for the test suite. For
;;; internal use only.
;;;
;;; Code:
(define (open-connection-for-tests)
"Open a connection to the build daemon for tests purposes and return it."
(guard (c ((nix-error? c)
(format (current-error-port)
"warning: build daemon error: ~s~%" c)
#f))
(let ((store (open-connection)))
;; Make sure we build everything by ourselves.
(set-build-options store #:use-substitutes? #f)
;; Use the bootstrap Guile when running tests, so we don't end up
;; building everything in the temporary test store.
(%guile-for-build (package-derivation store %bootstrap-guile))
store)))
(define %seed
(seed->random-state (logxor (getpid) (car (gettimeofday)))))
(define (random-text)
"Return the hexadecimal representation of a random number."
(number->string (random (expt 2 256) %seed) 16))
(define (random-bytevector n)
"Return a random bytevector of N bytes."
(let ((bv (make-bytevector n)))
(let loop ((i 0))
(if (< i n)
(begin
(bytevector-u8-set! bv i (random 256 %seed))
(loop (1+ i)))
bv))))
(define (network-reachable?)
"Return true if we can reach the Internet."
(false-if-exception (getaddrinfo "www.gnu.org" "80" AI_NUMERICSERV)))
(define-syntax-rule (mock (module proc replacement) body ...)
"Within BODY, replace the definition of PROC from MODULE with the definition
given by REPLACEMENT."
(let* ((m (resolve-module 'module))
(original (module-ref m 'proc)))
(dynamic-wind
(lambda () (module-set! m 'proc replacement))
(lambda () body ...)
(lambda () (module-set! m 'proc original)))))
;;;
;;; Narinfo files, as used by the substituter.
;;;
(define* (derivation-narinfo drv #:key (nar "example.nar")
(sha256 (make-bytevector 32 0)))
"Return the contents of the narinfo corresponding to DRV; NAR should be the
file name of the archive containing the substitute for DRV, and SHA256 is the
expected hash."
(format #f "StorePath: ~a
URL: ~a
Compression: none
NarSize: 1234
NarHash: sha256:~a
References:
System: ~a
Deriver: ~a~%"
(derivation->output-path drv) ; StorePath
nar ; URL
(bytevector->nix-base32-string sha256) ; NarHash
(derivation-system drv) ; System
(basename
(derivation-file-name drv)))) ; Deriver
(define %substitute-directory
(make-parameter
(and=> (getenv "GUIX_BINARY_SUBSTITUTE_URL")
(compose uri-path string->uri))))
(define* (call-with-derivation-narinfo drv thunk
#:key (sha256 (make-bytevector 32 0)))
"Call THUNK in a context where fake substituter data, as read by 'guix
substitute-binary', has been installed for DRV. SHA256 is the hash of the
expected output of DRV."
(let* ((output (derivation->output-path drv))
(dir (%substitute-directory))
(info (string-append dir "/nix-cache-info"))
(narinfo (string-append dir "/" (store-path-hash-part output)
".narinfo")))
(dynamic-wind
(lambda ()
(call-with-output-file info
(lambda (p)
(format p "StoreDir: ~a\nWantMassQuery: 0\n"
(%store-prefix))))
(call-with-output-file narinfo
(lambda (p)
(display (derivation-narinfo drv #:sha256 sha256) p))))
thunk
(lambda ()
(delete-file narinfo)
(delete-file info)))))
(define-syntax with-derivation-narinfo
(syntax-rules (sha256 =>)
"Evaluate BODY in a context where DRV looks substitutable from the
substituter's viewpoint."
((_ drv (sha256 => hash) body ...)
(call-with-derivation-narinfo drv
(lambda () body ...)
#:sha256 hash))
((_ drv body ...)
(call-with-derivation-narinfo drv
(lambda ()
body ...)))))
(define* (call-with-derivation-substitute drv contents thunk
#:key sha256)
"Call THUNK in a context where a substitute for DRV has been installed,
using CONTENTS, a string, as its contents. If SHA256 is true, use it as the
expected hash of the substitute; otherwise use the hash of the nar containing
CONTENTS."
(define dir (%substitute-directory))
(dynamic-wind
(lambda ()
(call-with-output-file (string-append dir "/example.out")
(lambda (port)
(display contents port)))
(call-with-output-file (string-append dir "/example.nar")
(lambda (p)
(write-file (string-append dir "/example.out") p))))
(lambda ()
(let ((hash (call-with-input-file (string-append dir "/example.nar")
port-sha256)))
;; Create fake substituter data, to be read by `substitute-binary'.
(call-with-derivation-narinfo drv
thunk
#:sha256 (or sha256 hash))))
(lambda ()
(delete-file (string-append dir "/example.out"))
(delete-file (string-append dir "/example.nar")))))
(define (shebang-too-long?)
"Return true if the typical shebang in the current store would exceed
Linux's static limit---the BINPRM_BUF_SIZE constant, normally 128 characters
all included."
(define shebang
(string-append "#!" (%store-prefix) "/"
(make-string 32 #\a)
"-bootstrap-binaries-0/bin/bash\0"))
(> (string-length shebang) 128))
(define-syntax with-derivation-substitute
(syntax-rules (sha256 =>)
"Evaluate BODY in a context where DRV is substitutable with the given
CONTENTS."
((_ drv contents (sha256 => hash) body ...)
(call-with-derivation-substitute drv contents
(lambda () body ...)
#:sha256 hash))
((_ drv contents body ...)
(call-with-derivation-substitute drv contents
(lambda ()
body ...)))))
(define-syntax-rule (dummy-package name* extra-fields ...)
"Return a \"dummy\" package called NAME*, with all its compulsory fields
initialized with default values, and with EXTRA-FIELDS set as specified."
(package extra-fields ...
(name name*) (version "0") (source #f)
(build-system gnu-build-system)
(synopsis #f) (description #f)
(home-page #f) (license #f)))
;; Local Variables:
;; eval: (put 'call-with-derivation-narinfo 'scheme-indent-function 1)
;; eval: (put 'call-with-derivation-substitute 'scheme-indent-function 2)
;; End:
;;; tests.scm ends here
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