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How keys are looked up
======================
The key is located in the map whose type was determined when the
automount point was first created. In general the key is a pathname
component. In some circumstances this may be modified by variable
expansion (see Variable Expansion.) and prefixing. If the automount
point has a prefix, specified by the PREF option, then that is
prepended to the search key before the map is searched.
If the map cache is a `regexp' cache then the key is treated as an
egrep-style regular expression, otherwise a normal string comparison is
made.
If the key cannot be found then a "wildcard" match is attempted.
Amd repeatedly strips the basename from the key, appends `/*' and
attempts a lookup. Finally, Amd attempts to locate the special key `*'.
For example, the following sequence would be checked if
`home/dylan/dk2' was being located:
home/dylan/dk2
home/dylan/*
home/*
*
At any point when a wildcard is found, Amd proceeds as if an exact
match had been found and the value field is then used to resolve the
mount request, otherwise an error code is propagated back to the kernel.
(see Filesystem Types.).
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