1/***************************************************************************
2 * CVSID: $Id$
3 *
4 * hal_find_by_property.c : Find hal devices
5 *
6 * Copyright (C) 2005 David Zeuthen, <david@fubar.dk>
7 *
8 * Licensed under the Academic Free License version 2.1
9 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or
13 * (at your option) any later version.
14 *
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
18 * GNU General Public License for more details.
19 *
20 * You should have received a copy of the GNU General Public License
21 * along with this program; if not, write to the Free Software
22 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
23 *
24 **************************************************************************/
25
26
27#ifdef HAVE_CONFIG_H
28#  include <config.h>
29#endif
30
31#include <stdio.h>
32#include <string.h>
33#include <unistd.h>
34#include <getopt.h>
35
36#include <libhal.h>
37
38
39/** Print out program usage.
40 *
41 *  @param  argc                Number of arguments given to program
42 *  @param  argv                Arguments given to program
43 */
44static void
45usage (int argc, char *argv[])
46{
47	fprintf (stderr,
48 "\n"
49 "usage : hal-find-by-property --key <key> --string <value>\n"
50 "                              [--help] [--verbose] [--version]\n");
51
52/** @todo support other property types a'la hal-[get|set]-property */
53
54	fprintf (stderr,
55 "\n"
56 "        --key            Key of the property to check\n"
57 "        --string         String value of property\n"
58 "        --verbose        Be verbose\n"
59 "        --version        Show version and exit\n"
60 "        --help           Show this information and exit\n"
61 "\n"
62 "This program prints the Unique Device Identifiers for HAL device\n"
63 "objects where a given property assumes a given value. On success\n"
64 "the program exists with exit code 0. If there is an error, the\n"
65 "program exits with an exit code different from 0.\n"
66 "\n");
67}
68
69/** Entry point
70 *
71 *  @param  argc                Number of arguments given to program
72 *  @param  argv                Arguments given to program
73 *  @return                     Return code
74 */
75int
76main (int argc, char *argv[])
77{
78	int i;
79	int num_udis;
80	char **udis;
81	char *key = NULL;
82	char *value = NULL;
83	dbus_bool_t is_verbose = FALSE;
84	dbus_bool_t is_version = FALSE;
85	DBusError error;
86	LibHalContext *hal_ctx;
87
88	if (argc <= 1) {
89		usage (argc, argv);
90		return 1;
91	}
92
93	while (1) {
94		int c;
95		int option_index = 0;
96		const char *opt;
97		static struct option long_options[] = {
98			{"key", 1, NULL, 0},
99			{"string", 1, NULL, 0},
100			{"verbose", 0, NULL, 0},
101			{"version", 0, NULL, 0},
102			{"help", 0, NULL, 0},
103			{NULL, 0, NULL, 0}
104		};
105
106		c = getopt_long (argc, argv, "",
107				 long_options, &option_index);
108		if (c == -1)
109			break;
110
111		switch (c) {
112		case 0:
113			opt = long_options[option_index].name;
114
115			if (strcmp (opt, "help") == 0) {
116				usage (argc, argv);
117				return 0;
118			} else if (strcmp (opt, "verbose") == 0) {
119				is_verbose = TRUE;
120			} else if (strcmp (opt, "version") == 0) {
121				is_version = TRUE;
122			} else if (strcmp (opt, "key") == 0) {
123				key = strdup (optarg);
124			} else if (strcmp (opt, "string") == 0) {
125				value = strdup (optarg);
126			}
127			break;
128
129		default:
130			usage (argc, argv);
131			return 1;
132			break;
133		}
134	}
135
136	if (is_version) {
137		printf ("hal-find-by-property " PACKAGE_VERSION "\n");
138		return 0;
139	}
140
141	if (key == NULL || value == NULL) {
142		usage (argc, argv);
143		return 1;
144	}
145
146	dbus_error_init (&error);
147	if ((hal_ctx = libhal_ctx_new ()) == NULL) {
148		fprintf (stderr, "error: libhal_ctx_new\n");
149		return 1;
150	}
151	if (!libhal_ctx_set_dbus_connection (hal_ctx, dbus_bus_get (DBUS_BUS_SYSTEM, &error))) {
152		fprintf (stderr, "error: libhal_ctx_set_dbus_connection: %s: %s\n", error.name, error.message);
153		LIBHAL_FREE_DBUS_ERROR (&error);
154		return 1;
155	}
156	if (!libhal_ctx_init (hal_ctx, &error)) {
157		if (dbus_error_is_set(&error)) {
158			fprintf (stderr, "error: libhal_ctx_init: %s: %s\n", error.name, error.message);
159			LIBHAL_FREE_DBUS_ERROR (&error);
160		}
161		fprintf (stderr, "Could not initialise connection to hald.\n"
162				 "Normally this means the HAL daemon (hald) is not running or not ready.\n");
163		return 1;
164	}
165
166
167	udis = libhal_manager_find_device_string_match (hal_ctx, key, value, &num_udis, &error);
168
169	if (dbus_error_is_set (&error)) {
170		fprintf (stderr, "error: %s: %s\n", error.name, error.message);
171		LIBHAL_FREE_DBUS_ERROR (&error);
172		return 1;
173	}
174
175	if (is_verbose)
176		printf ("Found %d device objects with string property %s = '%s'\n", num_udis, key, value);
177
178	if (num_udis == 0) {
179		return 1;
180	}
181
182	for (i = 0; i < num_udis; i++) {
183		printf ("%s\n", udis[i]);
184	}
185
186	libhal_free_string_array (udis);
187
188	return 0;
189}
190
191/**
192 * @}
193 */
194