New command: 'mountpoints' which returns a hash of device -> mountpoint.

daemon/mount.c

@@ -142,14 +142,15 @@ do_umount (char *pathordevice)
   return 0;
 }
 
-char **
-do_mounts (void)
+static char **
+mounts_or_mountpoints (int mp)
 {
   char *out, *err;
   int r;
   char **ret = NULL;
   int size = 0, alloc = 0;
   char *p, *pend, *p2;
+  int len;
 
   r = command (&out, &err, "mount", NULL);
   if (r == -1) {
@@ -179,6 +180,20 @@ do_mounts (void)
 	free (out);
 	return NULL;
       }
+      if (mp) {
+	p2 += 12;		/* skip " on /sysroot" */
+	len = strcspn (p2, " ");
+
+	if (len == 0)		/* .. just /sysroot, so we turn it into "/" */
+	  p2 = (char *) "/";
+	else
+	  p2[len] = '\0';
+
+	if (add_string (&ret, &size, &alloc, p2) == -1) {
+	  free (out);
+	  return NULL;
+	}
+      }
     }
 
     p = pend;
@@ -192,6 +207,18 @@ do_mounts (void)
   return ret;
 }
 
+char **
+do_mounts (void)
+{
+  return mounts_or_mountpoints (0);
+}
+
+char **
+do_mountpoints (void)
+{
+  return mounts_or_mountpoints (1);
+}
+
 /* Unmount everything mounted under /sysroot.
  *
  * We have to unmount in the correct order, so we sort the paths by

src/MAX_PROC_NR

@@ -1 +1 @@
-146
+147

src/generator.ml

@@ -1371,7 +1371,9 @@ contains the filesystem.");
 This returns the list of currently mounted filesystems.  It returns
 the list of devices (eg. C</dev/sda1>, C</dev/VG/LV>).
 
-Some internal mounts are not shown.");
+Some internal mounts are not shown.
+
+See also: C<guestfs_mountpoints>");
 
   ("umount_all", (RErr, []), 47, [FishAlias "unmount-all"],
    [InitBasicFS, Always, TestOutputList (
@@ -2927,6 +2929,14 @@ This is the same as C<guestfs_removexattr>, but if C<path>
 is a symbolic link, then it removes an extended attribute
 of the link itself.");
 
+  ("mountpoints", (RHashtable "mps", []), 147, [],
+   [],
+   "show mountpoints",
+   "\
+This call is similar to C<guestfs_mounts>.  That call returns
+a list of devices.  This one returns a hash table (map) of
+device name to directory where the device is mounted.");
+
 ]
 
 let all_functions = non_daemon_functions @ daemon_functions