[The "next-gen LDAP schema" problem will have to simmer for a while, but in
the meantime, I've another little nut to crack on this list]
Map overrides. I'd like to have an indirect map that is normally pulled
from LDAP/Hesiod/etc.---but not necessarily 100% of the time. Sometimes, a
key will have to map to something other than the "canonical" location, and
on a locally-visible-only basis at that.
Real-life example: Let's say I have a straightforward NFS-homedir setup,
and a user "foo". So you'd typically see e.g.
fuzzball:/srv/users/foo on /nfshome/foo type nfs
But what if, for some reason, the workstation cannot contact the fuzzball
server? (Assume no server replication.) Then, I'd like to create a
temporary homedir, e.g.
/nfshome/foo -> /var/tmphomedir/foo (symlink)
so that the user can at least log in and check mail et al.
(There are other use cases, but this is probably the least convoluted one I
can think of. Note: My scenario would be with AFS, but I used NFS above
because it really shouldn't matter.)
Right now, I can sort-of get this behavior via a program map, one that
returns the /var/*** path when necessary. Of course, if I want LDAP/Hesiod
lookups to be the common case, then those have to be built into the program
map as well, making autofs's built-in lookup code redundant. Right now, I
can't say to autofs "First, check if program map A returns some
special-case path; if not, then use whatever directory service B says."
This would be a sort of failover for maps, in general terms: if the first
map doesn't succeed, try the second one, and so on. This is a bit iffy when
you're talking about directory services failing, because that usually
involves a longish timeout. But a program map can fail immediately, thereby
making itself transparent at the top of such a failover stack.
First of all, is there a way to do this currently?
If not, should I expect any difficulty in implementing this? On the
configuration side, I would think that extending the syntax to support this
behavior should be straightforward: just allow multiple entries for the
same mountpoint in auto.master.
--Daniel
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