mirror of
https://github.com/libguestfs/libguestfs.git
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145 lines
3.4 KiB
C
145 lines
3.4 KiB
C
/* libguestfs - the guestfsd daemon
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* Copyright (C) 2009 Red Hat Inc.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#include <config.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include "c-ctype.h"
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#include "ignore-value.h"
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#include "guestfs_protocol.h"
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#include "daemon.h"
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#include "actions.h"
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#include "optgroups.h"
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GUESTFSD_EXT_CMD(str_grep, grep);
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GUESTFSD_EXT_CMD(str_modprobe, modprobe);
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int
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do_internal_feature_available (const char *group)
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{
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size_t i;
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for (i = 0; optgroups[i].group != NULL; ++i) {
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if (STREQ (group, optgroups[i].group)) {
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const int av = optgroups[i].available ();
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return av ? 0 : 1;
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}
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}
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/* Unknown group */
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return 2;
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}
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char **
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do_available_all_groups (void)
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{
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size_t i;
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CLEANUP_FREE_STRINGSBUF DECLARE_STRINGSBUF (groups);
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for (i = 0; optgroups[i].group != NULL; ++i) {
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if (add_string (&groups, optgroups[i].group) == -1)
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return NULL;
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}
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if (end_stringsbuf (&groups) == -1)
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return NULL;
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return take_stringsbuf (&groups); /* caller frees */
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}
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/* Search for filesystem in /proc/filesystems, ignoring "nodev". */
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static int
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test_proc_filesystems (const char *filesystem)
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{
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CLEANUP_FREE char *regex = NULL;
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CLEANUP_FREE char *err = NULL;
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int r;
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if (asprintf (®ex, "^[[:space:]]*%s$", filesystem) == -1) {
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perror ("asprintf");
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return -1;
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}
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r = commandr (NULL, &err, str_grep, regex, "/proc/filesystems", NULL);
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if (r == -1 || r >= 2) {
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fprintf (stderr, "grep /proc/filesystems: %s", err);
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return -1;
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}
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return r == 0;
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}
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/* Do modprobe, ignore any errors. */
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static void
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modprobe (const char *module)
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{
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ignore_value (command (NULL, NULL, str_modprobe, module, NULL));
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}
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/* Internal function for testing if a filesystem is available. Note
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* this must not call reply_with_error functions.
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*/
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int
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filesystem_available (const char *filesystem)
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{
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int r;
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r = test_proc_filesystems (filesystem);
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if (r == -1 || r > 0)
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return r;
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/* Not found: try to modprobe the module, then test again. */
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if (optgroup_linuxmodules_available ()) {
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modprobe (filesystem);
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r = test_proc_filesystems (filesystem);
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if (r == -1)
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return -1;
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}
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return r;
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}
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int
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do_filesystem_available (const char *filesystem)
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{
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size_t i;
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const size_t len = strlen (filesystem);
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int r;
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for (i = 0; i < len; ++i) {
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if (!c_isalnum (filesystem[i]) && filesystem[i] != '_') {
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reply_with_error ("filesystem name contains non-alphanumeric characters");
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return -1;
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}
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}
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r = filesystem_available (filesystem);
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if (r == -1) {
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reply_with_error ("error testing for filesystem availability; "
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"enable verbose mode and look at preceding output");
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return -1;
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}
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return r;
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}
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