Implemented 'mount' and 'touch' commands.

daemon/mount.c

@@ -0,0 +1,76 @@
+/* libguestfs - the guestfsd daemon
+ * 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., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include <config.h>
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+#include "daemon.h"
+#include "actions.h"
+
+/* You must mount something on "/" first, hence: */
+int root_mounted = 0;
+
+/* The "simple mount" call offers no complex options, you can just
+ * mount a device on a mountpoint.
+ *
+ * It's tempting to try a direct mount(2) syscall, but that doesn't
+ * do any autodetection, so we are better off calling out to
+ * /bin/mount.
+ */
+
+int
+do_mount (const char *device, const char *mountpoint)
+{
+  int len, r, is_root;
+  char *mp;
+  char *error;
+
+  is_root = strcmp (mountpoint, "/") == 0;
+
+  if (!root_mounted && !is_root) {
+    reply_with_error ("mount: you must mount something on / first");
+    return -1;
+  }
+
+  len = strlen (mountpoint) + 9;
+
+  mp = malloc (len);
+  if (!mp) {
+    reply_with_perror ("malloc");
+    return -1;
+  }
+
+  snprintf (mp, len, "/sysroot%s", mountpoint);
+
+  r = command (NULL, &error,
+	       "mount", "-o", "sync,noatime", device, mp, NULL);
+  if (r == -1) {
+    reply_with_error ("mount: %s on %s: %s", device, mountpoint, error);
+    free (error);
+    return -1;
+  }
+
+  if (is_root)
+    root_mounted = 1;
+
+  return 0;
+}