1/***************************************************************************
2 * CVSID: $Id: hal-storage-mount.c,v 1.7 2006/06/21 00:44:03 david Exp $
3 *
4 * hal-storage-cleanup-all-mountpoints.c : Cleanup all mount points in
5 * /media/.hal-mtab that is currently unused
6 *
7 * Copyright (C) 2006 David Zeuthen, <david@fubar.dk>
8 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; either version 2 of the License, or
12 * (at your option) any later version.
13 *
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
17 * GNU General Public License for more details.
18 *
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software
21 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
22 *
23 **************************************************************************/
24
25#ifdef HAVE_CONFIG_H
26#  include <config.h>
27#endif
28
29#include <unistd.h>
30#include <stdio.h>
31#include <stdlib.h>
32#include <string.h>
33#include <glib.h>
34#include <glib/gstdio.h>
35
36#include "hal-storage-shared.h"
37
38/*#define DEBUG*/
39#define DEBUG
40
41static void
42usage (void)
43{
44	fprintf (stderr, "This program should only be started by hald.\n");
45	exit (1);
46}
47
48static void
49do_cleanup (void)
50{
51	int i, j;
52	FILE *hal_mtab_orig;
53	int hal_mtab_orig_len;
54	int num_read;
55	char *hal_mtab_buf;
56	char **lines;
57	FILE *hal_mtab_new;
58
59	hal_mtab_orig = fopen ("/media/.hal-mtab", "r");
60	if (hal_mtab_orig == NULL) {
61		unknown_error ("Cannot open /media/.hal-mtab");
62	}
63	if (fseek (hal_mtab_orig, 0L, SEEK_END) != 0) {
64		unknown_error ("Cannot seek to end of /media/.hal-mtab");
65	}
66	hal_mtab_orig_len = ftell (hal_mtab_orig);
67	if (hal_mtab_orig_len < 0) {
68		unknown_error ("Cannot determine size of /media/.hal-mtab");
69	}
70	rewind (hal_mtab_orig);
71	hal_mtab_buf = g_new0 (char, hal_mtab_orig_len + 1);
72	num_read = fread (hal_mtab_buf, 1, hal_mtab_orig_len, hal_mtab_orig);
73	if (num_read != hal_mtab_orig_len) {
74		unknown_error ("Cannot read from /media/.hal-mtab");
75	}
76	fclose (hal_mtab_orig);
77
78#ifdef DEBUG
79	printf ("hal_mtab = '%s'\n", hal_mtab_buf);
80#endif
81
82	lines = g_strsplit (hal_mtab_buf, "\n", 0);
83	g_free (hal_mtab_buf);
84
85	/* find the entry we're going to unmount */
86	for (i = 0; lines[i] != NULL; i++) {
87		char **line_elements;
88
89#ifdef DEBUG
90		printf (" line = '%s'\n", lines[i]);
91#endif
92
93		if ((lines[i])[0] == '#')
94			continue;
95
96		line_elements = g_strsplit (lines[i], "\t", 6);
97		if (g_strv_length (line_elements) == 6) {
98			char *mount_point;
99
100#ifdef DEBUG
101			printf ("  devfile     = '%s'\n", line_elements[0]);
102			printf ("  uid         = '%s'\n", line_elements[1]);
103			printf ("  session id  = '%s'\n", line_elements[2]);
104			printf ("  fs          = '%s'\n", line_elements[3]);
105			printf ("  options     = '%s'\n", line_elements[4]);
106			printf ("  mount_point = '%s'\n", line_elements[5]);
107#endif
108
109			/* just try to rmdir the entry; if it's non-empty or something is mounted on it,
110			 * this will fail
111			 */
112			mount_point = line_elements[5];
113
114			/* remove directory */
115			if (g_rmdir (mount_point) == 0) {
116				char *line_to_free;
117
118				printf ("Removed mount_point '%s'", mount_point);
119
120				line_to_free = lines[i];
121				for (j = i; lines[j] != NULL; j++) {
122					lines[j] = lines[j+1];
123				}
124				lines[j] = NULL;
125				g_free (line_to_free);
126
127				/* we've moved the lines one back, so make sure we don't advance to next line */
128				i--;
129			}
130		}
131
132		g_strfreev (line_elements);
133	}
134
135	/* create new .hal-mtab~ file without the entries we've removed */
136	hal_mtab_new = fopen ("/media/.hal-mtab~", "w");
137	if (hal_mtab_new == NULL) {
138		unknown_error ("Cannot create /media/.hal-mtab~");
139	}
140	for (i = 0; lines[i] != NULL; i++) {
141		if (strlen (lines[i]) > 0) {
142			char anewl[2] = "\n\0";
143			if (fwrite (lines[i], 1, strlen (lines[i]), hal_mtab_new) != strlen (lines[i])) {
144				unknown_error ("Cannot write to /media/.hal-mtab~");
145			}
146			if (fwrite (anewl, 1, 1, hal_mtab_new) != 1) {
147				unknown_error ("Cannot write to /media/.hal-mtab~");
148			}
149		}
150	}
151	fclose (hal_mtab_new);
152
153	g_strfreev (lines);
154
155	/* set new .hal-mtab file */
156	if (rename ("/media/.hal-mtab~", "/media/.hal-mtab") != 0) {
157		unlink ("/media/.hal-mtab~");
158		unknown_error ("Cannot rename /media/.hal-mtab~ to /media/.hal-mtab");
159	}
160}
161
162int
163main (int argc, char *argv[])
164{
165	if (!lock_hal_mtab ()) {
166		unknown_error ("Cannot obtain lock on /media/.hal-mtab");
167	}
168
169	if (getenv ("HAL_PROP_INFO_UDI") == NULL)
170		usage ();
171
172#ifdef DEBUG
173	printf ("in hal-storage-cleanup-all-mountpoints\n");
174#endif
175	do_cleanup ();
176
177
178	unlock_hal_mtab ();
179	return 0;
180}
181