1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
|
/* guestfish - the filesystem interactive shell
* Copyright (C) 2009 Red Hat Inc.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include <config.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <fcntl.h>
#include <inttypes.h>
#include <errno.h>
#include <libintl.h>
#include "xstrtol.h"
#include "fish.h"
int
run_alloc (const char *cmd, size_t argc, char *argv[])
{
if (argc != 2) {
fprintf (stderr, _("use 'alloc file size' to create an image\n"));
return -1;
}
if (alloc_disk (argv[0], argv[1], 1, 0) == -1)
return -1;
return 0;
}
int
run_sparse (const char *cmd, size_t argc, char *argv[])
{
if (argc != 2) {
fprintf (stderr, _("use 'sparse file size' to create a sparse image\n"));
return -1;
}
if (alloc_disk (argv[0], argv[1], 1, 1) == -1)
return -1;
return 0;
}
/* This is the underlying allocation function. It's called from
* a few other places in guestfish.
*/
int
alloc_disk (const char *filename, const char *size_str, int add, int sparse)
{
off_t size;
int fd;
char c = 0;
if (parse_size (size_str, &size) == -1)
return -1;
fd = open (filename, O_WRONLY|O_CREAT|O_NOCTTY|O_TRUNC|O_CLOEXEC, 0666);
if (fd == -1) {
perror (filename);
return -1;
}
if (!sparse) { /* Not sparse */
#ifdef HAVE_POSIX_FALLOCATE
int err = posix_fallocate (fd, 0, size);
if (err != 0) {
errno = err;
perror ("fallocate");
close (fd);
unlink (filename);
return -1;
}
#else
/* Slow emulation of posix_fallocate on platforms which don't have it. */
char buffer[BUFSIZ];
memset (buffer, 0, sizeof buffer);
size_t remaining = size;
while (remaining > 0) {
size_t n = remaining > sizeof buffer ? sizeof buffer : remaining;
ssize_t r = write (fd, buffer, n);
if (r == -1) {
perror ("write");
close (fd);
unlink (filename);
return -1;
}
remaining -= r;
}
#endif
} else { /* Sparse */
if (lseek (fd, size-1, SEEK_SET) == (off_t) -1) {
perror ("lseek");
close (fd);
unlink (filename);
return -1;
}
if (write (fd, &c, 1) != 1) {
perror ("write");
close (fd);
unlink (filename);
return -1;
}
}
if (close (fd) == -1) {
perror (filename);
unlink (filename);
return -1;
}
if (add) {
if (guestfs_add_drive_opts (g, filename,
GUESTFS_ADD_DRIVE_OPTS_FORMAT, "raw",
-1) == -1) {
unlink (filename);
return -1;
}
}
return 0;
}
int
parse_size (const char *str, off_t *size_rtn)
{
unsigned long long size;
strtol_error xerr;
xerr = xstrtoull (str, NULL, 0, &size, "0kKMGTPEZY");
if (xerr != LONGINT_OK) {
fprintf (stderr,
_("%s: invalid integer parameter (%s returned %d)\n"),
"parse_size", "xstrtoull", xerr);
return -1;
}
/* XXX 32 bit file offsets, if anyone uses them? GCC should give
* a warning here anyhow.
*/
*size_rtn = size;
return 0;
}
|
