1/***************************************************************************
2 * CVSID: $Id: hal-storage-mount.c,v 1.7 2006/06/21 00:44:03 david Exp $
3 *
4 * hal-storage-cleanup-mountpoint.c : Cleanup mount point when hald detects
5 * that an unmount not done through Unmount()
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 (const char *mount_point)
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	gboolean found;
59
60	hal_mtab_orig = fopen ("/media/.hal-mtab", "r");
61	if (hal_mtab_orig == NULL) {
62		unknown_error ("Cannot open /media/.hal-mtab");
63	}
64	if (fseek (hal_mtab_orig, 0L, SEEK_END) != 0) {
65		unknown_error ("Cannot seek to end of /media/.hal-mtab");
66	}
67	hal_mtab_orig_len = ftell (hal_mtab_orig);
68	if (hal_mtab_orig_len < 0) {
69		unknown_error ("Cannot determine size of /media/.hal-mtab");
70	}
71	rewind (hal_mtab_orig);
72	hal_mtab_buf = g_new0 (char, hal_mtab_orig_len + 1);
73	num_read = fread (hal_mtab_buf, 1, hal_mtab_orig_len, hal_mtab_orig);
74	if (num_read != hal_mtab_orig_len) {
75		unknown_error ("Cannot read from /media/.hal-mtab");
76	}
77	fclose (hal_mtab_orig);
78
79#ifdef DEBUG
80	printf ("hal_mtab = '%s'\n", hal_mtab_buf);
81#endif
82
83	lines = g_strsplit (hal_mtab_buf, "\n", 0);
84	g_free (hal_mtab_buf);
85
86	/* find the entry we're going to unmount */
87	found = FALSE;
88	for (i = 0; lines[i] != NULL && !found; i++) {
89		char **line_elements;
90
91#ifdef DEBUG
92		printf (" line = '%s'\n", lines[i]);
93#endif
94
95		if ((lines[i])[0] == '#')
96			continue;
97
98		line_elements = g_strsplit (lines[i], "\t", 6);
99		if (g_strv_length (line_elements) == 6) {
100
101#ifdef DEBUG
102			printf ("  devfile     = '%s'\n", line_elements[0]);
103			printf ("  uid         = '%s'\n", line_elements[1]);
104			printf ("  session id  = '%s'\n", line_elements[2]);
105			printf ("  fs          = '%s'\n", line_elements[3]);
106			printf ("  options     = '%s'\n", line_elements[4]);
107			printf ("  mount_point = '%s'\n", line_elements[5]);
108#endif
109
110			if (strcmp (line_elements[5], mount_point) == 0) {
111				char *line_to_free;
112
113				found = TRUE;
114
115				line_to_free = lines[i];
116				for (j = i; lines[j] != NULL; j++) {
117					lines[j] = lines[j+1];
118				}
119				lines[j] = NULL;
120				g_free (line_to_free);
121			}
122		}
123
124		g_strfreev (line_elements);
125	}
126
127	if (!found) {
128		unknown_error ("mount point is not /media/.hal-mtab");
129	}
130
131#ifdef DEBUG
132	printf ("Found entry for mount point '%s' in /media/.hal-mtab", mount_point);
133#endif
134
135	/* create new .hal-mtab~ file without the entry we're going to unmount */
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 (i > 0) {
142			char anewl[2] = "\n\0";
143			if (fwrite (anewl, 1, 1, hal_mtab_new) != 1) {
144				unknown_error ("Cannot write to /media/.hal-mtab~");
145			}
146		}
147
148		if (fwrite (lines[i], 1, strlen (lines[i]), hal_mtab_new) != strlen (lines[i])) {
149			unknown_error ("Cannot write to /media/.hal-mtab~");
150		}
151
152	}
153	fclose (hal_mtab_new);
154
155	g_strfreev (lines);
156
157	/* remove directory */
158	if (g_rmdir (mount_point) != 0) {
159		unlink ("/media/.hal-mtab~");
160		unknown_error ("Cannot remove directory");
161	}
162
163	/* set new .hal-mtab file */
164	if (rename ("/media/.hal-mtab~", "/media/.hal-mtab") != 0) {
165		unlink ("/media/.hal-mtab~");
166		unknown_error ("Cannot rename /media/.hal-mtab~ to /media/.hal-mtab");
167	}
168
169}
170
171int
172main (int argc, char *argv[])
173{
174	char *mount_point;
175
176	if (!lock_hal_mtab ()) {
177		unknown_error ("Cannot obtain lock on /media/.hal-mtab");
178	}
179
180	mount_point = getenv ("HALD_CLEANUP");
181	if (mount_point == NULL)
182		usage ();
183
184#ifdef DEBUG
185	printf ("in hal-storage-cleanup-mountpoint for mount point '%s'\n", mount_point);
186#endif
187	do_cleanup (mount_point);
188
189
190	unlock_hal_mtab ();
191	return 0;
192}
193