path: root/archival/dpkg_deb.c (plain)
blob: 13f9db991534668381d0944d24f29bdf38baabd4

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	#if ENABLE_FEATURE_SEAMLESS_GZ
74	llist_add_to(&ar_archive->accept, (char*)"data.tar.gz");
75	llist_add_to(&control_tar_llist, (char*)"control.tar.gz");
76	#endif
77	#if ENABLE_FEATURE_SEAMLESS_BZ2
78	llist_add_to(&ar_archive->accept, (char*)"data.tar.bz2");
79	llist_add_to(&control_tar_llist, (char*)"control.tar.bz2");
80	#endif
81	#if ENABLE_FEATURE_SEAMLESS_LZMA
82	llist_add_to(&ar_archive->accept, (char*)"data.tar.lzma");
83	llist_add_to(&control_tar_llist, (char*)"control.tar.lzma");
84	#endif
85
86	opt_complementary = "c--efXx:e--cfXx:f--ceXx:X--cefx:x--cefX";
87	opt = getopt32(argv, "cefXx");
88	argv += optind;
89	argc -= optind;
90
91	if (opt & DPKG_DEB_OPT_CONTENTS) {
92	tar_archive->action_header = header_verbose_list;
93	}
94	extract_dir = NULL;
95	need_args = 1;
96	if (opt & DPKG_DEB_OPT_CONTROL) {
97	ar_archive->accept = control_tar_llist;
98	tar_archive->action_data = data_extract_all;
99	if (1 == argc) {
100	extract_dir = "./DEBIAN";
101	} else {
102	need_args++;
103	}
104	}
105	if (opt & DPKG_DEB_OPT_FIELD) {
106	/* Print the entire control file
107	* it should accept a second argument which specifies a
108	* specific field to print */
109	ar_archive->accept = control_tar_llist;
110	llist_add_to(&(tar_archive->accept), (char*)"./control");
111	tar_archive->filter = filter_accept_list;
112	tar_archive->action_data = data_extract_to_stdout;
113	}
114	if (opt & DPKG_DEB_OPT_EXTRACT) {
115	tar_archive->action_header = header_list;
116	}
117	if (opt & (DPKG_DEB_OPT_EXTRACT_VERBOSE | DPKG_DEB_OPT_EXTRACT)) {
118	tar_archive->action_data = data_extract_all;
119	need_args = 2;
120	}
121
122	if (need_args != argc) {
123	bb_show_usage();
124	}
125
126	tar_archive->src_fd = ar_archive->src_fd = xopen(argv[0], O_RDONLY);
127
128	/* Work out where to extract the files */
129	/* 2nd argument is a dir name */
130	if (argv[1]) {
131	extract_dir = argv[1];
132	}
133	if (extract_dir) {
134	mkdir(extract_dir, 0777); /* bb_make_directory(extract_dir, 0777, 0) */
135	xchdir(extract_dir);
136	}
137
138	/* Do it */
139	unpack_ar_archive(ar_archive);
140
141	/* Cleanup */
142	if (ENABLE_FEATURE_CLEAN_UP)
143	close(ar_archive->src_fd);
144
145	return EXIT_SUCCESS;
146	}
147