1 /* libguestfs - the guestfsd daemon
2 * Copyright (C) 2009 Red Hat Inc.
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation; either version 2 of the License, or
7 * (at your option) any later version.
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the Free Software
16 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
28 #include "../src/guestfs_protocol.h"
33 do_touch (const char *path)
41 fd = open (path, O_WRONLY | O_CREAT | O_NOCTTY, 0666);
45 reply_with_perror ("open: %s", path);
49 if (futimens (fd, NULL) == -1) {
50 reply_with_perror ("futimens: %s", path);
60 do_cat (const char *path)
63 int alloc, size, r, max;
70 fd = open (path, O_RDONLY);
74 reply_with_perror ("open: %s", path);
78 /* Read up to GUESTFS_MESSAGE_MAX - <overhead> bytes. If it's
79 * larger than that, we need to return an error instead (for
82 max = GUESTFS_MESSAGE_MAX - 1000;
90 reply_with_error ("cat: %s: file is too large for message buffer",
96 buf2 = realloc (buf, alloc);
98 reply_with_perror ("realloc");
106 r = read (fd, buf + size, alloc - size);
108 reply_with_perror ("read: %s", path);
121 if (close (fd) == -1) {
122 reply_with_perror ("close: %s", path);
127 return buf; /* caller will free */
131 do_read_lines (const char *path)
134 int size = 0, alloc = 0;
141 ABS_PATH (path, NULL);
144 fp = fopen (path, "r");
148 reply_with_perror ("fopen: %s", path);
152 while ((n = getline (&line, &len, fp)) != -1) {
153 /* Remove either LF or CRLF. */
154 if (n >= 2 && line[n-2] == '\r' && line[n-1] == '\n')
156 else if (n >= 1 && line[n-1] == '\n')
159 if (add_string (&r, &size, &alloc, line) == -1) {
168 if (add_string (&r, &size, &alloc, NULL) == -1) {
173 if (fclose (fp) == EOF) {
174 reply_with_perror ("fclose: %s", path);
183 do_rm (const char *path)
195 reply_with_perror ("unlink: %s", path);
203 do_chmod (int mode, const char *path)
211 r = chmod (path, mode);
215 reply_with_perror ("chmod: %s: 0%o", path, mode);
223 do_chown (int owner, int group, const char *path)
231 r = chown (path, owner, group);
235 reply_with_perror ("chown: %s: %d.%d", path, owner, group);
243 do_exists (const char *path)
251 r = access (path, F_OK);
258 do_is_file (const char *path)
267 r = lstat (path, &buf);
271 if (errno != ENOENT && errno != ENOTDIR) {
272 reply_with_perror ("stat: %s", path);
276 return 0; /* Not a file. */
279 return S_ISREG (buf.st_mode);
283 do_write_file (const char *path, const char *content, int size)
291 size = strlen (content);
294 fd = open (path, O_WRONLY | O_TRUNC | O_CREAT | O_NOCTTY, 0666);
298 reply_with_perror ("open: %s", path);
302 if (xwrite (fd, content, size) == -1) {
303 reply_with_perror ("write");
308 if (close (fd) == -1) {
309 reply_with_perror ("close: %s", path);
316 /* This runs the 'file' command. */
318 do_file (const char *path)
321 int r, len, freeit = 0;
324 NEED_ROOT_OR_IS_DEVICE (path, NULL);
325 ABS_PATH (path, NULL);
327 if (strncmp (path, "/dev/", 5) == 0)
330 len = strlen (path) + 9;
333 reply_with_perror ("malloc");
336 snprintf (buf, len, "/sysroot%s", path);
340 /* file(1) manpage claims "file returns 0 on success, and non-zero on
341 * error", but this is evidently not true. It always returns 0, in
342 * every scenario I can think up. So check the target is readable
345 if (access (buf, R_OK) == -1) {
346 if (freeit) free (buf);
347 reply_with_perror ("access: %s", path);
351 r = command (&out, &err, "file", "-bsL", buf, NULL);
352 if (freeit) free (buf);
356 reply_with_error ("file: %s: %s", path, err);
362 /* We need to remove the trailing \n from output of file(1). */
364 if (out[len-1] == '\n')
367 return out; /* caller frees */