Messages in this thread | | | From | Ramkumar Ramachandra <> | Date | Tue, 16 Jul 2013 23:42:55 +0530 | Subject | Re: [PATCH] um/configs: don't use devtmpfs in defconfig |
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Al Viro wrote: > As for the devices, they are *not* bogus. RTFM, already. > Documentation/virtual/uml/UserModeLinux-HOWTO.txt, if you can't be bothered > to say git grep UML Documentation/ and find where it on your own. The > relevant section is called "Setting up serial lines and consoles". > Seriously, it's not as if the documentation didn't exist or had been > hard to find...
Yes; I've been trying to decipher the con thing for some time now.
> FWIW, default config is rather annoying - 6 xterms spawned and associated > with /dev/tty[1-6]. con0=fd:0,fd:1 con=pts mentioned in the HOWTO would, > IMO, make for much saner default.
Leave aside the fact that I could not find the uml-utils upstream [1], and didn't have a /uml/port-helper to connect the xterms for a second; I didn't even understand what was supposed to happen. Why do we spawn xterms, and attach to the host's /dev/tty*? So far, I just used /dev/console inside my existing tmux session in urxvt, and it seems to work fine.
> No comments on systemd behaviour - take that with LP and his crowd. They > may or may not be confused by /dev/tty1 not being a virtual console.
From my brief discussion with Lennart, he's just following what Documentation/devices.txt says: /dev/tty* are virtual consoles. If um is making some sort of exception for good reason, I'm sure systemd can accommodate it.
> One > practical issue is the lack of VT102 emulation;
This detail is not at all clear from the Documentation. I spent a lot of time trying to figure out why systemd wasn't able to getty on /dev/tty1.
> TERM=linux when logged > in on those is not right - you want either TERM=xterm (for xterms) or > TERM=screen (when accessing pts-associated ones with screen /dev/pts/n), > etc. In any case, it's a dumb serial line as far as the guest kernel > is concerned - all terminal emulation is going to happen elsewhere (xterms > running on host and interpreting escape sequences from guest userland, > etc.)
Hm, what does $TERM have to do with all this?
[1]: A fabulously empty git repository here: sourceforge.net/p/user-mode-linux/git/ref/master/
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