[buildd-tools-devel] Bug#604268: Bug#604268: Bug#604268: Bug#604268: Bug#604268: QEMU linux-user support

[Julian Andres Klode]

On Tue, Jan 25, 2011 at 03:44:29PM +0100, Loïc Minier wrote:
> On Mon, Jan 24, 2011, Loïc Minier wrote:
> >  While we could try parsing binfmt-support's format or binfmt_misc's
> >  format, I think the best thing here would be to check with the
> >  binfmt-support maintainer.  I wonder whether binfmt-support is
> >  Debian/Ubuntu specific.  If it is, then poking the kernel format or
> >  trying to run a binary might be best.  If it's also used on other
> >  distros, perhaps we can get some command which tells us what the
> >  interpreter is for a specific binary.  If that makes sense to you, I
> >  can poke Colin about it, and perhaps open a bug report for the
> >  binfmt-support changes.
> 
>  I've asked Colin about this, and he implemented support for that in
>  trunk!  :-)   (I tested it, there was an issue in the original version
>  but r109 fixed it)
> 
>  (bzr+ssh://bzr.debian.org/bzr/binfmt-support/trunk or
>  http://bzr.debian.org/binfmt-support/trunk)
> 
>     % sudo apt-get build-dep binfmt-support
>     % ./configure && make
>     % src/update-binfmts --find $chroot/bin/true
>     /usr/bin/qemu-arm-static
> 
>  Note that the --find might return multiple interpreters; in this case,
>  the kernel tries them one by one.
> 
>  Perhaps we should do something like find the first static interpreter,
>  or always copy the first interpreter and warn if there is more than
>  one?
> 
Attaching my solution for this.

-- 
Julian Andres Klode  - Debian Developer, Ubuntu Member

See http://wiki.debian.org/JulianAndresKlode and http://jak-linux.org/.
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#!/bin/sh
# Copyright © 2011 Julian Andres Klode <jak at debian.org>
#
# schroot is free software: you can redistribute it and/or modify it
# under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# schroot is distributed in the hope that it will be useful, but
# WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
# General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see
# <http://www.gnu.org/licenses/>.
#
#####################################################################

set -e

. "$SETUP_DATA_DIR/common-data"
. "$SETUP_DATA_DIR/common-functions"

if [ "$STAGE" != "setup-start" -a "$STAGE" != "setup-stop" ]; then
    exit 0
elif ! which update-binfmts > /dev/null; then
	info "Missing update-binfmts"
	exit 0
fi

shell="${CHROOT_PATH}/bin/sh"

for emulator in $(update-binfmts --find "$shell"); do
	dst="${CHROOT_PATH}$emulator"
	if [ ! -e "$emulator" ]; then
		info "Missing emulator: $emulator"
	else
        if [ ! -e "$dst" ]; then
			printf "#!/bin/sh\n#Created by sbuild\nexit 0" > "$dst"
        fi
        mount --bind "$emulator" "$dst"
        mount -o remount,ro "$dst"
	fi
done
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