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test_strip_components.c revision 1.1 
      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 }
    110