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1 | /* | |
2 | * Copyright (c) 2001, Robert Collins. | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or modify | |
5 | * it under the terms of the GNU General Public License as published by | |
6 | * the Free Software Foundation; either version 2 of the License, or | |
7 | * (at your option) any later version. | |
8 | * | |
9 | * A copy of the GNU General Public License can be found at | |
10 | * http://www.gnu.org/ | |
11 | * | |
12 | * Written by Robert Collins <rbtcollins@hotmail.com> | |
13 | * | |
14 | */ | |
15 | ||
16 | /* Archive IO operations | |
17 | */ | |
18 | ||
19 | #include "LogSingleton.h" | |
20 | ||
21 | #include "io_stream.h" | |
22 | #include "archive.h" | |
23 | #include "archive_tar.h" | |
24 | ||
25 | /* This file is the sole user of alloca(), so do this here. | |
26 | * This will go away when this file is useing proper C++ string handling. */ | |
27 | #if HAVE_ALLOCA_H | |
28 | #include <alloca.h> | |
29 | #else | |
30 | #ifndef alloca | |
31 | #define alloca __builtin_alloca | |
32 | #endif | |
33 | #endif | |
34 | ||
35 | /* In case you are wondering why the file magic is not in one place: | |
36 | * It could be. But there is little (any?) benefit. | |
37 | * What is important is that the file magic required for any _task_ is centralised. | |
38 | * One such task is identifying archives | |
39 | * | |
40 | * to federate into each class one might add a magic parameter to the constructor, which | |
41 | * the class could test itself. | |
42 | */ | |
43 | ||
44 | /* GNU TAR: | |
45 | * offset 257 string ustar\040\040\0 | |
46 | */ | |
47 | ||
48 | #define longest_magic 265 | |
49 | ||
50 | archive * | |
51 | archive::extract (io_stream * original) | |
52 | { | |
53 | if (!original) | |
54 | return NULL; | |
55 | char magic[longest_magic]; | |
56 | if (original->peek (magic, longest_magic) > 0) | |
57 | { | |
58 | if (memcmp (&magic[257], "ustar\040\040\0", 8) == 0 | |
59 | || memcmp (&magic[257], "ustar\0", 6) == 0) | |
60 | { | |
61 | /* tar */ | |
62 | archive_tar *rv = new archive_tar (original); | |
63 | if (!rv->error ()) | |
64 | return rv; | |
65 | return NULL; | |
66 | } | |
67 | } | |
68 | return NULL; | |
69 | } | |
70 | ||
71 | archive::extract_results | |
72 | archive::extract_file (archive * source, const std::string& prefixURL, | |
73 | const std::string& prefixPath, std::string suffix) | |
74 | { | |
75 | extract_results res = extract_other; | |
76 | if (source) | |
77 | { | |
78 | const std::string destfilename = prefixURL + prefixPath | |
79 | + source->next_file_name() + suffix; | |
80 | switch (source->next_file_type ()) | |
81 | { | |
82 | case ARCHIVE_FILE_REGULAR: | |
83 | { | |
84 | /* TODO: remove in-the-way directories via mkpath_p */ | |
85 | if (io_stream::mkpath_p (PATH_TO_FILE, destfilename, 0755)) | |
86 | { | |
87 | Log (LOG_TIMESTAMP) << "Failed to make the path for " << destfilename | |
88 | << endLog; | |
89 | res = extract_inuse; | |
90 | goto out; | |
91 | } | |
92 | io_stream::remove (destfilename); | |
93 | io_stream *in = source->extract_file (); | |
94 | if (!in) | |
95 | { | |
96 | Log (LOG_TIMESTAMP) << "Failed to extract the file " | |
97 | << destfilename << " from the archive" | |
98 | << endLog; | |
99 | res = extract_inuse; | |
100 | goto out; | |
101 | } | |
102 | io_stream *tmp = io_stream::open (destfilename, "wb", in->get_mode ()); | |
103 | if (!tmp) | |
104 | { | |
105 | delete in; | |
106 | Log (LOG_TIMESTAMP) << "Failed to open " << destfilename; | |
107 | Log (LOG_TIMESTAMP) << " for writing." << endLog; | |
108 | res = extract_inuse; | |
109 | } | |
110 | else if (io_stream::copy (in, tmp)) | |
111 | { | |
112 | Log (LOG_TIMESTAMP) << "Failed to output " << destfilename | |
113 | << endLog; | |
114 | delete in; | |
115 | delete tmp; | |
116 | io_stream::remove (destfilename); | |
117 | res = extract_other; | |
118 | } | |
119 | else | |
120 | { | |
121 | tmp->set_mtime (in->get_mtime ()); | |
122 | delete in; | |
123 | delete tmp; | |
124 | res = extract_ok; | |
125 | } | |
126 | } | |
127 | break; | |
128 | case ARCHIVE_FILE_SYMLINK: | |
129 | if (io_stream::mkpath_p (PATH_TO_FILE, destfilename, 0755)) | |
130 | { | |
131 | Log (LOG_TIMESTAMP) << "Failed to make the path for %s" | |
132 | << destfilename << endLog; | |
133 | res = extract_other; | |
134 | } | |
135 | else | |
136 | { | |
137 | io_stream::remove (destfilename); | |
138 | int x = io_stream::mklink (destfilename, | |
139 | prefixURL+ source->linktarget (), | |
140 | IO_STREAM_SYMLINK); | |
141 | /* FIXME: check what tar's filelength is set to for symlinks */ | |
142 | source->skip_file (); | |
143 | res = x == 0 ? extract_ok : extract_inuse; | |
144 | } | |
145 | break; | |
146 | case ARCHIVE_FILE_HARDLINK: | |
147 | if (io_stream::mkpath_p (PATH_TO_FILE, destfilename, 0755)) | |
148 | { | |
149 | Log (LOG_TIMESTAMP) << "Failed to make the path for %s" | |
150 | << destfilename << endLog; | |
151 | res = extract_other; | |
152 | } | |
153 | else | |
154 | { | |
155 | io_stream::remove (destfilename); | |
156 | int x = io_stream::mklink (destfilename, | |
157 | prefixURL + prefixPath + source->linktarget (), | |
158 | IO_STREAM_HARDLINK); | |
159 | /* FIXME: check what tar's filelength is set to for hardlinks */ | |
160 | source->skip_file (); | |
161 | res = x == 0 ? extract_ok : extract_inuse; | |
162 | } | |
163 | break; | |
164 | case ARCHIVE_FILE_DIRECTORY: | |
165 | { | |
166 | char *path = (char *) alloca (destfilename.size() + 1); | |
167 | strcpy (path, destfilename.c_str()); | |
168 | while (path[0] && path[strlen (path) - 1] == '/') | |
169 | path[strlen (path) - 1] = 0; | |
170 | io_stream *in = source->extract_file (); | |
171 | int x = io_stream::mkpath_p (PATH_TO_DIR, path, in->get_mode ()); | |
172 | delete in; | |
173 | source->skip_file (); | |
174 | res = x == 0 ? extract_ok : extract_other; | |
175 | } | |
176 | break; | |
177 | case ARCHIVE_FILE_INVALID: | |
178 | source->skip_file (); | |
179 | break; | |
180 | } | |
181 | } | |
182 | out: | |
183 | return res; | |
184 | } | |
185 | ||
186 | archive::~archive () {}; |