A LINKBACK converts a file or directory in the image to point to its
corresponding location in /ram. At boot time, the location in
/ram then points back to a location in the master image based
on the node's class, hostname, or a defined property.
- The CLASS target causes the linkback to point to the file or
directory having an extension that matches the node's class name.
- The NODE target causes the linkback to point to the file
or directory having an extension that matches the node's hostname.
- The PROPERTY target causes the linkback to point to the
first existing alphanumeric file or directory having an extension that matches
one of the node's defined properties.
- Any arbitrary file or directory can be specified as the direct
target of a linkback. This target is interpolated to
replace any instance of `$CLASS' with the node's
class name, and any instance of `$NODE' with the node's hostname.
-f forces the linkback to point to the specified target even
if the target doesn't exist. Note: The -f option cannot be used
with PROPERTY linkbacks.
-h specifies that the linkback target should be 'hidden'.
Note: Only CLASS, NODE, and PROPERTY linkbacks can use the -h
option.
-c limits the directive to apply only to the given classes.
-n limits the directive to apply only to the given nodes.
-p limits the directive to apply only to nodes having one or
more of the given properties.