X-Git-Url: http://git.annexia.org/?p=libguestfs.git;a=blobdiff_plain;f=daemon%2Fmount.c;h=1820f8a8e4b79ea2a9b1a1987a77bb55adad5464;hp=3abdabddaf53af11d64751880b69492b3eceaaaa;hb=a7b73d4a1e09f12b2002083618056f0c823c1dcf;hpb=d7ffe439e8ec5304a1a2d1eb591d348c4ab84f38

diff --git a/daemon/mount.c b/daemon/mount.c
index 3abdabd..1820f8a 100644
--- a/daemon/mount.c
+++ b/daemon/mount.c
@@ -1,5 +1,5 @@
 /* libguestfs - the guestfsd daemon
- * Copyright (C) 2009 Red Hat Inc. 
+ * 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
@@ -39,13 +39,15 @@ int root_mounted = 0;
  */
 
 int
-do_mount_vfs (const char *options, const char *vfstype,
-	      const char *device, const char *mountpoint)
+do_mount_vfs (char *options, char *vfstype,
+	      char *device, char *mountpoint)
 {
   int len, r, is_root;
   char *mp;
   char *error;
 
+  IS_DEVICE (device, -1);
+
   is_root = strcmp (mountpoint, "/") == 0;
 
   if (!root_mounted && !is_root) {
@@ -69,6 +71,7 @@ do_mount_vfs (const char *options, const char *vfstype,
   else
     r = command (NULL, &error,
 		 "mount", "-o", options, device, mp, NULL);
+  free (mp);
   if (r == -1) {
     reply_with_error ("mount: %s on %s: %s", device, mountpoint, error);
     free (error);
@@ -82,20 +85,20 @@ do_mount_vfs (const char *options, const char *vfstype,
 }
 
 int
-do_mount (const char *device, const char *mountpoint)
+do_mount (char *device, char *mountpoint)
 {
   return do_mount_vfs ("sync,noatime", NULL, device, mountpoint);
 }
 
 int
-do_mount_ro (const char *device, const char *mountpoint)
+do_mount_ro (char *device, char *mountpoint)
 {
   return do_mount_vfs ("ro", NULL, device, mountpoint);
 }
 
 int
-do_mount_options (const char *options, const char *device,
-		  const char *mountpoint)
+do_mount_options (char *options, char *device,
+		  char *mountpoint)
 {
   return do_mount_vfs (options, NULL, device, mountpoint);
 }
@@ -104,15 +107,16 @@ do_mount_options (const char *options, const char *device,
  * is kept updated.
  */
 int
-do_umount (const char *pathordevice)
+do_umount (char *pathordevice)
 {
   int len, freeit = 0, r;
   char *buf;
   char *err;
 
-  if (strncmp (pathordevice, "/dev/", 5) == 0)
-    buf = (char *) pathordevice;
-  else {
+  if (strncmp (pathordevice, "/dev/", 5) == 0) {
+    buf = pathordevice;
+    IS_DEVICE (buf, -1);
+  } else {
     len = strlen (pathordevice) + 9;
     freeit = 1;
     buf = malloc (len);
@@ -188,29 +192,133 @@ do_mounts (void)
   return ret;
 }
 
-/* Only unmount stuff under /sysroot */
+/* Unmount everything mounted under /sysroot.
+ *
+ * We have to unmount in the correct order, so we sort the paths by
+ * longest first to ensure that child paths are unmounted by parent
+ * paths.
+ *
+ * This call is more important than it appears at first, because it
+ * is widely used by both test and production code in order to
+ * get back to a known state (nothing mounted, everything synchronized).
+ */
+static int
+compare_longest_first (const void *vp1, const void *vp2)
+{
+  char * const *p1 = (char * const *) vp1;
+  char * const *p2 = (char * const *) vp2;
+  int n1 = strlen (*p1);
+  int n2 = strlen (*p2);
+  return n2 - n1;
+}
+
 int
 do_umount_all (void)
 {
-  char **mounts;
+  char *out, *err;
   int i, r;
-  char *err;
+  char **mounts = NULL;
+  int size = 0, alloc = 0;
+  char *p, *p2, *p3, *pend;
 
-  mounts = do_mounts ();
-  if (mounts == NULL)		/* do_mounts has already replied */
+  r = command (&out, &err, "mount", NULL);
+  if (r == -1) {
+    reply_with_error ("mount: %s", err);
+    free (out);
+    free (err);
     return -1;
+  }
+
+  free (err);
+
+  p = out;
+  while (p) {
+    pend = strchr (p, '\n');
+    if (pend) {
+      *pend = '\0';
+      pend++;
+    }
+
+    /* Lines have the format:
+     *   /dev/foo on /mountpoint type ...
+     */
+    p2 = strstr (p, " on /sysroot");
+    if (p2 != NULL) {
+      p2 += 4;
+      p3 = p2 + strcspn (p2, " ");
+      *p3 = '\0';
+      if (add_string (&mounts, &size, &alloc, p2) == -1) {
+	free (out);
+	return -1;
+      }
+    }
+
+    p = pend;
+  }
+  free (out);
 
-  for (i = 0; mounts[i] != NULL; ++i) {
+  qsort (mounts, size, sizeof (char *), compare_longest_first);
+
+  /* Unmount them. */
+  for (i = 0; i < size; ++i) {
     r = command (NULL, &err, "umount", mounts[i], NULL);
     if (r == -1) {
       reply_with_error ("umount: %s: %s", mounts[i], err);
       free (err);
-      free_strings (mounts);
+      free_stringslen (mounts, size);
       return -1;
     }
     free (err);
   }
 
-  free_strings (mounts);
+  free_stringslen (mounts, size);
+
+  /* We've unmounted root now, so ... */
+  root_mounted = 0;
+
+  return 0;
+}
+
+/* Mount using the loopback device.  You can't use the generic
+ * do_mount call for this because the first parameter isn't a
+ * device.
+ */
+int
+do_mount_loop (char *file, char *mountpoint)
+{
+  int len, r;
+  char *buf, *mp;
+  char *error;
+
+  NEED_ROOT (-1);
+  ABS_PATH (file, -1);
+
+  /* We have to prefix /sysroot on both the filename and the mountpoint. */
+  len = strlen (mountpoint) + 9;
+  mp = malloc (len);
+  if (!mp) {
+    reply_with_perror ("malloc");
+    return -1;
+  }
+  snprintf (mp, len, "/sysroot%s", mountpoint);
+
+  len = strlen (file) + 9;
+  buf = malloc (len);
+  if (!file) {
+    reply_with_perror ("malloc");
+    free (mp);
+    return -1;
+  }
+  snprintf (buf, len, "/sysroot%s", file);
+
+  r = command (NULL, &error, "mount", "-o", "loop", buf, mp, NULL);
+  free (mp);
+  free (buf);
+  if (r == -1) {
+    reply_with_error ("mount: %s on %s: %s", file, mountpoint, error);
+    free (error);
+    return -1;
+  }
+
   return 0;
 }