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
28static int
29touch(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
40DEFINE_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