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;;; GNU Guix --- Functional package management for GNU
;;; Copyright © 2012, 2013 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 (test-nar)
#:use-module (guix nar)
#:use-module (rnrs bytevectors)
#:use-module (rnrs io ports)
#:use-module (srfi srfi-26)
#:use-module (srfi srfi-64)
#:use-module (ice-9 ftw)
#:use-module (ice-9 match))
;; Test the (guix nar) module.
;;;
;;; File system testing tools, initially contributed to Guile, then libchop.
;;;
(define (random-file-size)
(define %average (* 1024 512)) ; 512 KiB
(define %stddev (* 1024 64)) ; 64 KiB
(inexact->exact
(max 0 (round (+ %average (* %stddev (random:normal)))))))
(define (make-file-tree dir tree)
"Make file system TREE at DIR."
(let loop ((dir dir)
(tree tree))
(define (scope file)
(string-append dir "/" file))
(match tree
(('directory name (body ...))
(mkdir (scope name))
(for-each (cute loop (scope name) <>) body))
(('directory name (? integer? mode) (body ...))
(mkdir (scope name))
(for-each (cute loop (scope name) <>) body)
(chmod (scope name) mode))
((file)
(populate-file (scope file) (random-file-size)))
((file (? integer? mode))
(populate-file (scope file) (random-file-size))
(chmod (scope file) mode))
((from '-> to)
(symlink to (scope from))))))
(define (delete-file-tree dir tree)
"Delete file TREE from DIR."
(let loop ((dir dir)
(tree tree))
(define (scope file)
(string-append dir "/" file))
(match tree
(('directory name (body ...))
(for-each (cute loop (scope name) <>) body)
(rmdir (scope name)))
(('directory name (? integer? mode) (body ...))
(chmod (scope name) #o755) ; make sure it can be entered
(for-each (cute loop (scope name) <>) body)
(rmdir (scope name)))
((from '-> _)
(delete-file (scope from)))
((file _ ...)
(delete-file (scope file))))))
(define-syntax-rule (with-file-tree dir tree body ...)
(dynamic-wind
(lambda ()
(make-file-tree dir 'tree))
(lambda ()
body ...)
(lambda ()
(delete-file-tree dir 'tree))))
(define (file-tree-equal? input output)
"Return #t if the file trees at INPUT and OUTPUT are equal."
(define strip
(cute string-drop <> (string-length input)))
(define sibling
(compose (cut string-append output <>) strip))
(define (file=? a b)
(and (eq? (stat:type (lstat a)) (stat:type (lstat b)))
(case (stat:type (lstat a))
((regular)
(equal?
(call-with-input-file a get-bytevector-all)
(call-with-input-file b get-bytevector-all)))
((symlink)
(string=? (readlink a) (readlink b)))
(else
(error "what?" (lstat a))))))
(file-system-fold (const #t)
(lambda (name stat result) ; leaf
(and result
(file=? name (sibling name))))
(lambda (name stat result) ; down
result)
(lambda (name stat result) ; up
result)
(const #f) ; skip
(lambda (name stat errno result)
(pk 'error name stat errno)
#f)
(> (stat:nlink (stat output)) 2)
input
lstat))
(define (make-random-bytevector n)
(let ((bv (make-bytevector n)))
(let loop ((i 0))
(if (< i n)
(begin
(bytevector-u8-set! bv i (random 256))
(loop (1+ i)))
bv))))
(define (populate-file file size)
(call-with-output-file file
(lambda (p)
(put-bytevector p (make-random-bytevector size)))))
(define (rm-rf dir)
(file-system-fold (const #t) ; enter?
(lambda (file stat result) ; leaf
(delete-file file))
(const #t) ; down
(lambda (dir stat result) ; up
(rmdir dir))
(const #t) ; skip
(const #t) ; error
#t
dir
lstat))
(define %test-dir
;; An output directory under $top_builddir.
(string-append (dirname (search-path %load-path "pre-inst-env"))
"/test-nar-" (number->string (getpid))))
(test-begin "nar")
(test-assert "write-file + restore-file"
(let* ((input (string-append (dirname (search-path %load-path "guix.scm"))
"/guix"))
(output %test-dir)
(nar (string-append output ".nar")))
(dynamic-wind
(lambda () #t)
(lambda ()
(call-with-output-file nar
(cut write-file input <>))
(call-with-input-file nar
(cut restore-file <> output))
(file-tree-equal? input output))
(lambda ()
(false-if-exception (delete-file nar))
(false-if-exception (rm-rf output))))))
(test-assert "write-file + restore-file with symlinks"
(let ((input (string-append %test-dir ".input")))
(mkdir input)
(dynamic-wind
(const #t)
(lambda ()
(with-file-tree input
(directory "root"
(("reg") ("exe" #o777) ("sym" -> "reg")))
(let* ((output %test-dir)
(nar (string-append output ".nar")))
(dynamic-wind
(lambda () #t)
(lambda ()
(call-with-output-file nar
(cut write-file input <>))
(call-with-input-file nar
(cut restore-file <> output))
(file-tree-equal? input output))
(lambda ()
(false-if-exception (delete-file nar))
(false-if-exception (rm-rf output)))))))
(lambda ()
(rmdir input)))))
(test-end "nar")
(exit (= (test-runner-fail-count (test-runner-current)) 0))
;;; Local Variables:
;;; eval: (put 'with-file-tree 'scheme-indent-function 2)
;;; End:
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