commands/tar/test/test_strip_components.c

   1 /*-
   2  * Copyright (c) 2003-2007 Tim Kientzle
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  *
  14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR(S) ``AS IS'' AND ANY EXPRESS OR
  15  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  16  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  17  * IN NO EVENT SHALL THE AUTHOR(S) BE LIABLE FOR ANY DIRECT, INDIRECT,
  18  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  19  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  20  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  21  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  22  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  23  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  24  */
  25 #include "test.h"
  26 __FBSDID("$FreeBSD: src/usr.bin/tar/test/test_strip_components.c,v 1.2 2008/11/10 05:24:13 kientzle Exp $");
  27
  28 static int
  29 touch(const char *fn)
  30 {
  31         FILE *f = fopen(fn, "w");
  32         failure("Couldn't create file '%s', errno=%d (%s)\n",
  33             fn, errno, strerror(errno));
  34         if (!assert(f != NULL))
  35                 return (0); /* Failure. */
  36         fclose(f);
  37         return (1); /* Success */
  38 }
  39
  40 DEFINE_TEST(test_strip_components)
  41 {
  42         assertMakeDir("d0", 0755);
  43         assertChdir("d0");
  44         assertMakeDir("d1", 0755);
  45         assertMakeDir("d1/d2", 0755);
  46         assertMakeDir("d1/d2/d3", 0755);
  47         assertEqualInt(1, touch("d1/d2/f1"));
  48         assertMakeHardlink("l1", "d1/d2/f1");
  49         assertMakeHardlink("d1/l2", "d1/d2/f1");
  50         if (canSymlink()) {
  51                 assertMakeSymlink("s1", "d1/d2/f1");
  52                 assertMakeSymlink("d1/s2", "d2/f1");
  53         }
  54         assertChdir("..");
  55
  56         assertEqualInt(0, systemf("%s -cf test.tar d0", testprog));
  57
  58         assertMakeDir("target", 0755);
  59         assertEqualInt(0, systemf("%s -x -C target --strip-components 2 "
  60             "-f test.tar", testprog));
  61
  62         failure("d0/ is too short and should not get restored");
  63         assertFileNotExists("target/d0");
  64         failure("d0/d1/ is too short and should not get restored");
  65         assertFileNotExists("target/d1");
  66         failure("d0/d1/s2 is a symlink to something that won't be extracted");
  67         /* If platform supports symlinks, target/s2 is a broken symlink. */
  68         /* If platform does not support symlink, target/s2 doesn't exist. */
  69         assertFileNotExists("target/s2");
  70         if (canSymlink())
  71                 assertIsSymlink("target/s2", "d2/f1");
  72         failure("d0/d1/d2 should be extracted");
  73         assertIsDir("target/d2", -1);
  74
  75         /*
  76          * This next is a complicated case.  d0/l1, d0/d1/l2, and
  77          * d0/d1/d2/f1 are all hardlinks to the same file; d0/l1 can't
  78          * be extracted with --strip-components=2 and the other two
  79          * can.  Remember that tar normally stores the first file with
  80          * a body and the other as hardlink entries to the first
  81          * appearance.  So the final result depends on the order in
  82          * which these three names get archived.  If d0/l1 is first,
  83          * none of the three can be restored.  If either of the longer
  84          * names are first, then the two longer ones can both be
  85          * restored.
  86          *
  87          * The tree-walking code used by bsdtar always visits files
  88          * before subdirectories, so bsdtar's behavior is fortunately
  89          * deterministic:  d0/l1 will always get stored first and the
  90          * other two will be stored as hardlinks to d0/l1.  Since
  91          * d0/l1 can't be extracted, none of these three will be
  92          * extracted.
  93          *
  94          * It may be worth extending this test to force a particular
  95          * archiving order so as to exercise both of the cases described
  96          * above.
  97          *
  98          * Of course, this is all totally different for cpio and newc
  99          * formats because the hardlink management is different.
 100          * TODO: Rename this to test_strip_components_tar and create
 101          * parallel tests for cpio and newc formats.
 102          */
 103         failure("d0/l1 is too short and should not get restored");
 104         assertFileNotExists("target/l1");
 105         failure("d0/d1/l2 is a hardlink to file whose name was too short");
 106         assertFileNotExists("target/l2");
 107         failure("d0/d1/d2/f1 is a hardlink to file whose name was too short");
 108         assertFileNotExists("target/d2/f1");
 109 }