(Illustration by Gaich Muramatsu)
> I assume you mean /bin/pwd since many shells do have pwd built in Yes. Many commercial package installation scripts use /bin/pwd because they're written in sh, and they get the "wrong answer". > If you mean something like having a coda-volume for each architecture, I mean a sequence of hundreds of commands like these, executed by the client at boot time: # do-mnt @my-servers:/exp/depot/emacs-19.10/bin-_at_sys /depot/emacs-19.10/bin # do-mnt @my-servers:/exp/depot/emacs-19.10/lib-_at_sys /depot/emacs-19.10/lib # do-mnt @my-servers:/exp/depot/emacs-19.10/etc /depot/emacs-19.10/etc # do-mnt @my-servers:/exp/depot/emacs-19.10/man /depot/emacs-19.10/man # do-mnt @my-servers:/exp/depot/emacs-19.10/lisp /depot/emacs-19.10/lisp # do-mnt @my-servers:/exp/depot/X11R6-1.0/bin-_at_sys /depot/X11R6-1.0/bin # do-mnt @my-servers:/exp/depot/X11R6-1.0/lib-_at_sys /depot/X11R6-1.0/lib # do-mnt @my-servers:/exp/depot/X11R6-1.0/etc /depot/X11R6-1.0/etc # do-mnt @my-servers:/exp/depot/X11R6-1.0/man /depot/X11R6-1.0/man # do-mnt @my-servers:/exp/depot/X11R6-1.0/lisp /depot/X11R6-1.0/lisp @my-servers is a cookie that specifies a set of machines that are serving a filesystem. A given client will speak to several sets. You probably want X to survive campus network partitions, so you will have many geographically distributed hosts in that set. You may only have two hosts in the set that serves the dictionary datafiles or the shared tmp space, because you don't want to spend the disk space on a lot of copies. There may be many sets for home dirs such they are local on a bunch of users' machines. If you allow for hundreds of mounts from tens of sets of servers, the admin can build whatever mess he needs. The mounts need to be changable on machines without disrupting processes not using that namespace. For instance /home/foo/bb fills up, so I tell bb to log out, copy /home/foo/bb to /home/bar/bb, change the password file, and he logs back on to more space. For amd we used the yp map distribution method. However, yp sucks. For Coda the map notification mechanism should happen automatically, i.e. guaranteed delivery to the hosts using a volume, not a script I run on all hosts I think may have have mounted something on. Preferably the map notification mechanism will not require individually disabling the old mounts first, i.e. whenever a filesystem call happens it uses the most recent definition for that namespace, and does a new mount behind the scenes if necessary. > But, Coda would need reliable support for mounting the same volume > at multiple locations. And/or mounting arbitrary subtrees of a volume at multiple locations. > We have however found a need to extend this mechanism. For example > it could be very handy to have a name: @user which would expand to > $HOME, or a programmable one @MACHINE which would refer to a > directory called "desktop" on desktop workstations and to a > directory called "notebook" on laptops. Yes. Or some sort of mechanism that would assemble values from files that could change without recompiling Venus. Another member of the League for Programming Freedom (LPF) www.lpf.org ------------------------------------------------------------------------------- Brian Bartholomew - bb_at_wv.com - www.wv.com - Working Version, Cambridge, MAReceived on 1997-10-15 12:52:39