Conversation with #inferno at Sun Apr 22 12:37:36 2012 on powerman-asdf@irc.freenode.net (irc)
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(05:01:22) fr1tz [~fr1tz@195-202-241-126.dynamic.hispeed.ch] entered the room.
(05:27:29) fr1tz: hi everybody. i've only just recently started to dig into inferno and was wondering: is there already something like a file-server version of listen(1)? something that runs a cmd for each open() but serves a file instead of listening for network connections?
(05:59:15) leetspete: fr1tz: You can do that, I think.
(06:37:07) fr1tz: leetspete: What's the easiest way to do it?
(07:28:57) leetspete: fr1tz: You can mount a pipe.  I'm actually fuzzy on the details; sorry.  (And also for the late reply.)
(07:29:02) leetspete: I'm somewhat new to the OS.
(07:38:23) fr1tz: leetspete: The crux is that every Topen on the file spawns the command.
(07:38:55) leetspete: Ah, I see what you mean.
(07:39:30) fr1tz: leetspete: Yeah I just re-read my first message. Wasn't too clear :)
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(07:41:26) leetspete: Yeah, I was thinking you meant something like the Inferno equivalent of a Unix domain socket.
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(08:21:53) fr1tz: leetspete: Maybe I'm trying to solve the wrong problem. Here's what I want to do: Clients can mount the server without any auth taking place. The client then sees a bunch of public data files and a bunch of files that represent other 9p servers. Something like: % mount -A tcp!server!1234 /n/blarg && mount /n/blarg/srv1 /n/srv1
(08:23:59) leetspete: I could definitely be wrong about this, but it seems like you'd need to use the Styx module and spawn things yourself.  I've been poking at man pages.
(08:24:46) leetspete: Oh, for the case you are talking about, am I crazy for thinking bind is what you want?
(08:25:02) leetspete: Or mount {some script} /n/srv1?
(08:26:36) fr1tz: leetspete: The client would have to auth when mounting srv1. Mounting blarg just gives the possibility to mount srv1 via a file.
(08:27:36) leetspete: Even for, say,
(08:28:52) leetspete: Nah, wait, I was about to say something crazy.
(08:33:13) leetspete: export(4) with the file argument?  I am not sure...
(08:34:12) leetspete: fr1tz: Actually, it looks like bind(1) can take a file rather than a directory, and accept a directory to put it into; does that work for what you're doing?
(08:36:30) leetspete: So (untested), you could do bind /n/blarg/srv1 /n, I think.
(08:37:10) fr1tz: leetspete: The problem is how to implement the /n/blarg/srv1 file server-side.
(08:42:23) fr1tz: leetspete: I was going to write a "srvcmd filename cmd [args]" file server. it would serve styx on stdin/stdout, synthesizing filename and then spawning cmd for every Topen on filename, shuffling writes to the cmds stdin and reads from the cmds stdout.
(08:43:02) leetspete: Right, but it seems obvious enough that you figure it must have been written already.
(08:43:10) leetspete: I'd figure it must have been written already.
(08:43:25) fr1tz: leetspete: I thought the same, but haven't found anything yet :)
(08:43:43) leetspete: Right, I think I get what you're saying, then, haha.
(08:44:21) leetspete: If it seems that obvious, what are we missing if it's not there?
(08:48:50) leetspete: I mean, I'm saying I get what you're saying; I don't know the answer to that question.
(08:49:29) leetspete: For my part...I haven't gotten auth to work properly.  I've been at it a while; losing my head, haha.  I think it has to do with a crash in keyfs.  :P
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(08:54:29) fr1tz: leetspete: Hmm... is the option to supply a filename as src to mount even used? Certainly doesn't seem common. Maybe it's just a leftover from plan9, and the "inferno way" of doing things is to use and serve services using network addresses rather than files? Just a thought, don't know much yet about inferno :)
(09:00:57) leetspete: Oh, okay, okay, so
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(09:03:00) leetspete: You can mount {cmd}, right?  And have cat (or something) read and write the file?
(09:03:05) leetspete: I think that might do what you want.
(09:03:41) leetspete: Two cats, I think you'd need in the braces.
(09:04:17) leetspete: It'd be an ugly command, but I think that does it?  Auth would go through, etc.
(09:04:20) leetspete: I believe.
(09:04:36) leetspete: I have to take off; I'm up a little later than I can be.
(09:04:59) leetspete: Sorry I couldn't be of more help.
(09:06:05) fr1tz: No problem, good night :)
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