ash: remove superfluous code in arithmetic mode
[oweals/busybox.git] / archival / dpkg_deb.c
1 /* vi: set sw=4 ts=4: */
2 /*
3  * dpkg-deb packs, unpacks and provides information about Debian archives.
4  *
5  * Licensed under GPLv2 or later, see file LICENSE in this source tree.
6  */
7
8 //config:config DPKG_DEB
9 //config:       bool "dpkg_deb"
10 //config:       default n
11 //config:       select FEATURE_SEAMLESS_GZ
12 //config:       help
13 //config:         dpkg-deb unpacks and provides information about Debian archives.
14 //config:
15 //config:         This implementation of dpkg-deb cannot pack archives.
16 //config:
17 //config:         Unless you have a specific application which requires dpkg-deb,
18 //config:         say N here.
19 //config:
20 //config:config FEATURE_DPKG_DEB_EXTRACT_ONLY
21 //config:       bool "Extract only (-x)"
22 //config:       default n
23 //config:       depends on DPKG_DEB
24 //config:       help
25 //config:         This reduces dpkg-deb to the equivalent of
26 //config:         "ar -p <deb> data.tar.gz | tar -zx". However it saves space as none
27 //config:         of the extra dpkg-deb, ar or tar options are needed, they are linked
28 //config:         to internally.
29
30 //applet:IF_DPKG_DEB(APPLET_ODDNAME(dpkg-deb, dpkg_deb, BB_DIR_USR_BIN, BB_SUID_DROP, dpkg_deb))
31 //kbuild:lib-$(CONFIG_DPKG_DEB) += dpkg_deb.o
32
33 //usage:#define dpkg_deb_trivial_usage
34 //usage:       "[-cefxX] FILE [argument]"
35 //usage:#define dpkg_deb_full_usage "\n\n"
36 //usage:       "Perform actions on Debian packages (.debs)\n"
37 //usage:     "\n        -c      List contents of filesystem tree"
38 //usage:     "\n        -e      Extract control files to [argument] directory"
39 //usage:     "\n        -f      Display control field name starting with [argument]"
40 //usage:     "\n        -x      Extract packages filesystem tree to directory"
41 //usage:     "\n        -X      Verbose extract"
42 //usage:
43 //usage:#define dpkg_deb_example_usage
44 //usage:       "$ dpkg-deb -X ./busybox_0.48-1_i386.deb /tmp\n"
45
46 #include "libbb.h"
47 #include "bb_archive.h"
48
49 #define DPKG_DEB_OPT_CONTENTS         1
50 #define DPKG_DEB_OPT_CONTROL          2
51 #define DPKG_DEB_OPT_FIELD            4
52 #define DPKG_DEB_OPT_EXTRACT          8
53 #define DPKG_DEB_OPT_EXTRACT_VERBOSE 16
54
55 int dpkg_deb_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
56 int dpkg_deb_main(int argc, char **argv)
57 {
58         archive_handle_t *ar_archive;
59         archive_handle_t *tar_archive;
60         llist_t *control_tar_llist = NULL;
61         unsigned opt;
62         const char *extract_dir;
63         int need_args;
64
65         /* Setup the tar archive handle */
66         tar_archive = init_handle();
67
68         /* Setup an ar archive handle that refers to the gzip sub archive */
69         ar_archive = init_handle();
70         ar_archive->dpkg__sub_archive = tar_archive;
71         ar_archive->filter = filter_accept_list_reassign;
72
73         llist_add_to(&ar_archive->accept, (char*)"data.tar");
74         llist_add_to(&control_tar_llist, (char*)"control.tar");
75 #if ENABLE_FEATURE_SEAMLESS_GZ
76         llist_add_to(&ar_archive->accept, (char*)"data.tar.gz");
77         llist_add_to(&control_tar_llist, (char*)"control.tar.gz");
78 #endif
79 #if ENABLE_FEATURE_SEAMLESS_BZ2
80         llist_add_to(&ar_archive->accept, (char*)"data.tar.bz2");
81         llist_add_to(&control_tar_llist, (char*)"control.tar.bz2");
82 #endif
83 #if ENABLE_FEATURE_SEAMLESS_LZMA
84         llist_add_to(&ar_archive->accept, (char*)"data.tar.lzma");
85         llist_add_to(&control_tar_llist, (char*)"control.tar.lzma");
86 #endif
87 #if ENABLE_FEATURE_SEAMLESS_XZ
88         llist_add_to(&ar_archive->accept, (char*)"data.tar.xz");
89         llist_add_to(&control_tar_llist, (char*)"control.tar.xz");
90 #endif
91
92         opt_complementary = "c--efXx:e--cfXx:f--ceXx:X--cefx:x--cefX";
93         opt = getopt32(argv, "cefXx");
94         argv += optind;
95         argc -= optind;
96
97         if (opt & DPKG_DEB_OPT_CONTENTS) {
98                 tar_archive->action_header = header_verbose_list;
99         }
100         extract_dir = NULL;
101         need_args = 1;
102         if (opt & DPKG_DEB_OPT_CONTROL) {
103                 ar_archive->accept = control_tar_llist;
104                 tar_archive->action_data = data_extract_all;
105                 if (1 == argc) {
106                         extract_dir = "./DEBIAN";
107                 } else {
108                         need_args++;
109                 }
110         }
111         if (opt & DPKG_DEB_OPT_FIELD) {
112                 /* Print the entire control file
113                  * it should accept a second argument which specifies a
114                  * specific field to print */
115                 ar_archive->accept = control_tar_llist;
116                 llist_add_to(&(tar_archive->accept), (char*)"./control");
117                 tar_archive->filter = filter_accept_list;
118                 tar_archive->action_data = data_extract_to_stdout;
119         }
120         if (opt & DPKG_DEB_OPT_EXTRACT) {
121                 tar_archive->action_header = header_list;
122         }
123         if (opt & (DPKG_DEB_OPT_EXTRACT_VERBOSE | DPKG_DEB_OPT_EXTRACT)) {
124                 tar_archive->action_data = data_extract_all;
125                 need_args = 2;
126         }
127
128         if (need_args != argc) {
129                 bb_show_usage();
130         }
131
132         tar_archive->src_fd = ar_archive->src_fd = xopen(argv[0], O_RDONLY);
133
134         /* Work out where to extract the files */
135         /* 2nd argument is a dir name */
136         if (argv[1]) {
137                 extract_dir = argv[1];
138         }
139         if (extract_dir) {
140                 mkdir(extract_dir, 0777); /* bb_make_directory(extract_dir, 0777, 0) */
141                 xchdir(extract_dir);
142         }
143
144         /* Do it */
145         unpack_ar_archive(ar_archive);
146
147         /* Cleanup */
148         if (ENABLE_FEATURE_CLEAN_UP)
149                 close(ar_archive->src_fd);
150
151         return EXIT_SUCCESS;
152 }