Date: Mon, 11 Nov 2013 14:35:42 -0600 From: Nathan Whitehorn <nwhitehorn@freebsd.org> To: Devin Teske <dteske@freebsd.org>, Michael Dexter <editor@callfortesting.org> Cc: Current Current <freebsd-current@freebsd.org>, "Teske, Devin" <Devin.Teske@fisglobal.com>, Peter Grehan <grehan@freebsd.org> Subject: Re: [CFT] bsdinstall and zfsboot enhancements Message-ID: <52813F9E.8080304@freebsd.org> In-Reply-To: <BFE265FC-849A-4381-8DF7-216AD5584253@fisglobal.com> References: <C9783B1F-20EA-4C08-9947-70DF363E8B6A@fisglobal.com> <5275C597.6070702@freebsd.org> <97944047-D575-4E2E-B687-9871DFE058E3@fisglobal.com> <ABD90FE2-1540-410A-959E-D91D0BE811E3@freebsd.org> <52769CFE.5080707@freebsd.org> <5281340E.8080009@callfortesting.org> <BFE265FC-849A-4381-8DF7-216AD5584253@fisglobal.com>
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On 11/11/13 14:30, Teske, Devin wrote: > (disabling default gpg-signing until they fix a bug with the quoting) > > On Nov 11, 2013, at 11:46 AM, Michael Dexter wrote: > >> Hello all, >> >> I have been experimenting with various BSD and GNU/Linux boot media >> under bhyve and noticed that we may want to accommodate the "LiveCD" >> mode of the installer, which in turn requires the correct console. >> >> Currently, one is prompted for VT100 for installation but this does not >> appear to work/stick for LiveCD mode. >> >> Can anyone verify this? >> > Sorry, I mistook your issue in the previous e-mail to be on-going with the > thread it was inline with. > > "LiveCD" changes things a bit. > > (thinks) > > I would expect that a prompt could do: > > 1. modify /etc/ttys on the boot media > 2. run "init q" > > But there's a couple of assumptions... > > 3. Can we even write to /etc/ttys? > NB: We can write to /tmp because it's an md0 swap device > > So do we have to get fancy with slipping a unionfs layer backed by another > md swap device above the root? > > That would make every file on the boot media writable (writes would go to > the swap-backed md device and if you execute "rm -fW file" you can get back > files that have been previously unlinked -- unlinks are stored as whiteouts in > the swap backed md device). For all intents and purposes, the read-only file- > system becomes writable and we could then munge /etc/ttys to enable serial > only when a menu item is chosen. > > If I'm off-base, let me know... sounds like a lot of trouble. > > The alternative being that you enable serial by default but then I have to tell > field engineers to unplug barcode readers before they do an install??? (that's > a question, it may be entirely safe, but I've never tried, seems unsafe) > > Question is, how would you disable it? Goes back to writable filesystem. This is why I don't think we want to modify /etc/ttys. Instead we want to have init do the right thing (follow the boot console) with a single unchanged /etc/ttys. -Nathan
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