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Re: [Qemu-devel] Bug#632192: [PATCH] add QEMU_LD_PREFIX environment vari
From: |
Johannes Schauer |
Subject: |
Re: [Qemu-devel] Bug#632192: [PATCH] add QEMU_LD_PREFIX environment variable |
Date: |
Fri, 29 Jul 2011 17:21:59 +0200 |
User-agent: |
Mutt/1.5.20 (2009-06-14) |
On Fri, Jul 29, 2011 at 05:52:50AM -0700, Vagrant Cascadian wrote:
> setting up a wrapper makes trivial cross-architecture chroots harder
> as you'll have to copy two binaries into the chroot, and i'm not sure
> if it would work at all, as the wrapper will need to somehow emulate
> it's own interpreter...
Agreed - this makes a wrapper not an option. I didnt think of that.
> > Alternatively we should have a generic setup for mapping enviroment
> > variables to command line options. Now we get special per-option
> > code every time someone needs to setup a command line option from
> > binfmt.
>
> this would seem a bit better alternative to me...
So if we agree on using environment variables to pass options to
qemu-user we next need to agree on how to name the options.
The following commandline arguments exist (in order as they are checked
in linux-user/main.c) and I shortly described and proposed a name for
the environment variable in the same line.
-d (activate log) - QEMU_LOG
-D (logfile) - QEMU_LOGFILE
-E (set target env variabe) - QEMU_SET_ENV
-U (unset target env variabe) - QEMU_UNSET_ENV
-0 (set target argv[0]) - QEMU_ARGV0
-s (stack size) - QEMU_STACK_SIZE
-L (elf interpreter prefix) - QEMU_LD_PREFIX
-p (page size) - QEMU_PAGESIZE
-g (listen for gdb on port) - QEMU_GDB
-r (uname) - QEMU_UNAME
-cpu (cpu model) - QEMU_CPU
-B (guest base) - QEMU_GUEST_BASE
-R (reserved virtual address) - QEMU_RESERVED_VA
-drop-ld-preload - QEMU_DROP_LD_PRELOAD
-singlestep - QEMU_SINGLESTEP
-strace - QEMU_STRACE
also, there already is the QEMU_STRACE environment variable which could
be incorporated into the solution?
the -E and -U options can be specified several times so the environment
variables should be able to receive a list - maybe in the getsubopt(3)
style?
So what do you think?
cheers, josch
- [Qemu-devel] [PATCH] add QEMU_LD_PREFIX environment variable, Johannes Schauer, 2011/07/06
- [Qemu-devel] [PATCH] add QEMU_LD_PREFIX environment variable, josch, 2011/07/23
- Re: [Qemu-devel] Bug#632192: [PATCH] add QEMU_LD_PREFIX environment variable, Vagrant Cascadian, 2011/07/29
- Re: [Qemu-devel] Bug#632192: [PATCH] add QEMU_LD_PREFIX environment variable,
Johannes Schauer <=
- Re: [Qemu-devel] Bug#632192: [PATCH] add QEMU_LD_PREFIX environment variable, Riku Voipio, 2011/07/30
- [Qemu-devel] [PATCH] introduce environment variables for all qemu-user options, j . schauer, 2011/07/31
- Re: [Qemu-devel] [PATCH] introduce environment variables for all qemu-user options, Peter Maydell, 2011/07/31
- [Qemu-devel] [PATCH] introduce environment variables for all qemu-user options, Johannes Schauer, 2011/07/31