Date: Wed, 21 Mar 2018 14:37:15 +0200 From: Konstantin Belousov <kostikbel@gmail.com> To: Andriy Gapon <avg@FreeBSD.org> Cc: Stefan Esser <se@freebsd.org>, freebsd-amd64@freebsd.org Subject: Re: Linux compat / changing compat path Message-ID: <20180321123715.GK76926@kib.kiev.ua> In-Reply-To: <75bf1e70-b43a-5642-f69a-cc085c50225a@FreeBSD.org> References: <fd061767-0b5b-d8f4-6c90-5ae6ff500ef9@bege.email> <20180321090911.4d1059c2@ernst.home> <e046a463-6463-b36c-3f16-1047abed7393@freebsd.org> <75bf1e70-b43a-5642-f69a-cc085c50225a@FreeBSD.org>
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On Wed, Mar 21, 2018 at 01:57:37PM +0200, Andriy Gapon wrote: > On 21/03/2018 10:39, Stefan Esser wrote: > > And you want to change occurances of /compat/linux in the kernel (and possibly > > some libraries and user programs), e.g. in /sys/amd64/linux/linux_sysvec.c ... > > > > There is some magic that makes an exec of /bin/sh look up /compat/linux/bin/sh > > first, if performed from within a program running under Linux emulation, and > > if you need that behavior, you have to adjust at least the kernel sources. > > > > Maybe the hard-coded "/compat/linux" should be replaced by a macro, to allow > > easy modification without loss of functionality ... > > I am not sure what would actually happen in the following case. > Create a jail and make it "pure Linux". That is, install only Linux binaries > there, no FreeBSD at all. And install them under the root of the jail, that is, > no /compat/linux within the jail. > Would that work? > Would I be able to start such a jail (processes in it) ? > Would they be able to correctly find their libraries and other executables they > might want to exec? > > If this works or could be made to work, then I am sure that some people would it > useful. > This already works. /compat/linux prefix is first try, and if not found, code falls back to normal lookup. People did used 'native linux' jails, in particular, to do builds.
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