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Path: sserve!newshost.anu.edu.au!munnari.oz.au!news.Hawaii.Edu!ames!agate!howland.reston.ans.net!news.moneng.mei.com!uwm.edu!ogicse!cs.uoregon.edu!usenet.ee.pdx.edu!not-for-mail From: eric@ee.pdx.edu (Eric Berggren) Newsgroups: comp.unix.bsd Subject: AMD question: ${rhost} expansion and ... Message-ID: <2cote8$r5q@ursula.ee.pdx.edu> Date: 21 Nov 93 07:26:00 GMT Article-I.D.: ursula.2cote8$r5q Sender: eric@ursula.ee.pdx.edu Lines: 67 NNTP-Posting-Host: ee.pdx.edu X-Newsreader: NN version 6.5.0 #2 (NOV) I am investigating the prospect of upgrading automount on our Sun network to AMD. With the exception of /, /usr (and maybe /var and /tmp), all hosts have their local disks mounted at boot under /disk/<name-of-part> (ie, the filesystems do not reflect the source and may not be unique). This was so that we didn't have to maintain two maps for autmount (one for NFS, one for local). It has other advantages over /home/host/<name> . Users may be accessed indirectly via /u/<username> where the actual filesystem may be on any host (including locally). Anyway, with that in mind, I'm trying to set up AMD to provide the same functionality as automount for starters. I am attempting to use the following map to accomplish this : = /defaults sublink:=${key};hostd!=${rhost};type:=nfs \ = hostd==${rhost};type:=link;fs:=${rfs} = = eric rhost:=ren.cs.pdx.edu;rfs:=/disk/blort = jane rhost:=ren.cs.pdx.edu;rfs:=/disk/blort = sue rhost:=ren.cs.pdx.edu;rfs:=/disk/blort = bob rhost:=ren.cs.pdx.edu;rfs:=/disk/blort = zort rhost:=ren.cs.pdx.edu;rfs:=/disk/blort If the user is on a host other than "ren", it will mount the filesystem ren:/disk/blort (if not already) and make the sublink. Otherwise, it will simply make a link into /disk/blort (already mounted in fstab). Two problems arrise from this. First, ${rhosts} does not appear to get expanded at the appropriate time before comparison. The manual states that ${rhost} is expanded first, assignments next, selectors and options last. I am finding that hostd==${rhost} always fails on "ren" (I have also tried 'host==${rhost.}' etc.). host==ren and hostd=ren.cs.pdx.edu do succeed however. Where am I blundering here ? Second, AMD seems to get confused with the non-determinism of the /defaults line. Replacing ${rhost} with "ren.cs.pdx.edu" to get around problem #1 temporarily, the above works fine on remote hosts, however, it fails on ren, with the entire key being mapped to 'error'. Is there a better way to do this, or can AMD be updated to work as above ? I do not wish to have to create a map containing hosts and their respective filesystems. Nor do I wish to have to rebuild the filesystem hierarchies to ensure they are unique across the network. If I do, then it isn't worth the switch. I'd appreciate suggestions, and possible even better, more advanced and varied examples of real AMD maps in use. Output from 'amd -v' : Copyright (c) 1990 Jan-Simon Pendry Copyright (c) 1990 Imperial College of Science, Technology & Medicine Copyright (c) 1990 The Regents of the University of California. amd 5.2.2.2 of 1992/05/31 16:53:21 bsd44-alpha #0: Thu Nov 18 23:42:32 PST 1993 Built by eric@ren.cs.pdx.edu for a sun3 running sos4 (big-endian). Map support for: root, passwd, union, nis, file, error. FS: ufs, nfs, nfsx, host, link, linkx, program, union, auto, direct, toplvl, error. Primary network is 131.252.20.0. Thanks. -eric -- Eric Berggren | "We are Microsoft. UNIX is irrelevant. Portland State University | OS/2 is irrelevant. Openness is futile. eric@ee.pdx.edu | Prepare to be assimilated." by prs@turing.org