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Re: [Qemu-devel] [PATCH v3] linux-user: Fix qemu-binfmt-conf.h to store


From: Riku Voipio
Subject: Re: [Qemu-devel] [PATCH v3] linux-user: Fix qemu-binfmt-conf.h to store config across reboot
Date: Wed, 17 Feb 2016 11:59:33 +0200

Hi,

On 16 February 2016 at 00:47, Laurent Vivier <address@hidden> wrote:
> Ping?

It looks good to me. But I'd like to see some ack/review from
Alexander or Michael.

Riku

> Le 29/01/2016 17:07, Laurent Vivier a écrit :
>> Original qemu-binfmt-conf.h is only able to write configuration
>> into /proc/sys/fs/binfmt_misc, and the configuration is lost on reboot.
>>
>> This script can configure debian and systemd services to restore
>> configuration on reboot. Moreover, it is able to manage binfmt
>> credential and to configure the path of the interpreter.
>>
>> List of supported CPU is:
>>
>> i386 i486 alpha arm sparc32plus ppc ppc64 ppc64le
>> m68k mips mipsel mipsn32 mipsn32el mips64 mips64el
>> sh4 sh4eb s390x aarch64
>>
>> Usage: qemu-binfmt-conf.sh [--qemu-path PATH][--debian][--systemd CPU]
>>                            [--help][--credential yes|no][--exportdir PATH]
>>
>>        Configure binfmt_misc to use qemu interpreter
>>
>>        --help:       display this usage
>>        --qemu-path:  set path to qemu interpreter (/usr/local/bin)
>>        --debian:     don't write into /proc,
>>                      instead generate update-binfmts templates
>>        --systemd:    don't write into /proc,
>>                      instead generate file for systemd-binfmt.service
>>                      for the given CPU
>>        --exportdir:  define where to write configuration files
>>                      (default: /etc/binfmt.d or /usr/share/binfmts)
>>        --credential: if yes, credential an security tokens are
>>                      calculated according to the binary to interpret
>>
>>     To import templates with update-binfmts, use :
>>
>>         sudo update-binfmts --importdir /usr/share/binfmts --import qemu-CPU
>>
>>     To remove interpreter, use :
>>
>>         sudo update-binfmts --package qemu-CPU --remove qemu-CPU 
>> /usr/local/bin
>>
>>     With systemd, binfmt files are loaded by systemd-binfmt.service
>>
>>     The environment variable HOST_ARCH allows to override 'uname' to generate
>>     configuration files for a different architecture than the current one.
>>
>> Signed-off-by: Laurent Vivier <address@hidden>
>> ---
>> v3: change subject to be shorter
>>     fix typo
>>     remove "!EOF", "echo -n" and "[ ... -o ... ]"
>>     check cpu given by --systemd is in the list
>> v2: replace some ERRORS by WARNINGS to be able to use the script inside a 
>> package build
>>     check only the right to write in the directory, no need to be root
>>     merge systemd and binfmt_misc configuration generation
>>     s/qemu_generate_packages/qemu_generate_debian/
>>     add support of HOST_ARCH from debian, and update CPU families.
>>     allow to use --exportdir with --systemd and update "Usage".
>>
>>  scripts/qemu-binfmt-conf.sh | 389 
>> ++++++++++++++++++++++++++++++++++++--------
>>  1 file changed, 320 insertions(+), 69 deletions(-)
>>  mode change 100644 => 100755 scripts/qemu-binfmt-conf.sh
>>
>> diff --git a/scripts/qemu-binfmt-conf.sh b/scripts/qemu-binfmt-conf.sh
>> old mode 100644
>> new mode 100755
>> index 289b1a3..de4d1c1
>> --- a/scripts/qemu-binfmt-conf.sh
>> +++ b/scripts/qemu-binfmt-conf.sh
>> @@ -1,72 +1,323 @@
>>  #!/bin/sh
>>  # enable automatic i386/ARM/M68K/MIPS/SPARC/PPC/s390 program execution by 
>> the kernel
>>
>> -# load the binfmt_misc module
>> -if [ ! -d /proc/sys/fs/binfmt_misc ]; then
>> -  /sbin/modprobe binfmt_misc
>> -fi
>> -if [ ! -f /proc/sys/fs/binfmt_misc/register ]; then
>> -  mount binfmt_misc -t binfmt_misc /proc/sys/fs/binfmt_misc
>> -fi
>> -
>> -# probe cpu type
>> -cpu=`uname -m`
>> -case "$cpu" in
>> -  i386|i486|i586|i686|i86pc|BePC|x86_64)
>> -    cpu="i386"
>> -  ;;
>> -  m68k)
>> -    cpu="m68k"
>> -  ;;
>> -  mips*)
>> -    cpu="mips"
>> -  ;;
>> -  "Power Macintosh"|ppc|ppc64)
>> -    cpu="ppc"
>> -  ;;
>> -  armv[4-9]*)
>> -    cpu="arm"
>> -  ;;
>> -esac
>> -
>> -# register the interpreter for each cpu except for the native one
>> -if [ $cpu != "i386" ] ; then
>> -    echo 
>> ':i386:M::\x7fELF\x01\x01\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x03\x00:\xff\xff\xff\xff\xff\xfe\xfe\xff\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff\xff:/usr/local/bin/qemu-i386:'
>>  > /proc/sys/fs/binfmt_misc/register
>> -    echo 
>> ':i486:M::\x7fELF\x01\x01\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x06\x00:\xff\xff\xff\xff\xff\xfe\xfe\xff\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff\xff:/usr/local/bin/qemu-i386:'
>>  > /proc/sys/fs/binfmt_misc/register
>> -fi
>> -if [ $cpu != "alpha" ] ; then
>> -    echo 
>> ':alpha:M::\x7fELF\x02\x01\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x26\x90:\xff\xff\xff\xff\xff\xfe\xfe\xff\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff\xff:/usr/local/bin/qemu-alpha:'
>>  > /proc/sys/fs/binfmt_misc/register
>> -fi
>> -if [ $cpu != "arm" ] ; then
>> -    echo   
>> ':arm:M::\x7fELF\x01\x01\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x28\x00:\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff\xff:/usr/local/bin/qemu-arm:'
>>  > /proc/sys/fs/binfmt_misc/register
>> -    echo   
>> ':armeb:M::\x7fELF\x01\x02\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x28:\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff:/usr/local/bin/qemu-armeb:'
>>  > /proc/sys/fs/binfmt_misc/register
>> -fi
>> -if [ $cpu != "aarch64" ] ; then
>> -    echo 
>> ':aarch64:M::\x7fELF\x02\x01\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\xb7\x00:\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff\xff:/usr/local/bin/qemu-aarch64:'
>>  > /proc/sys/fs/binfmt_misc/register
>> -fi
>> -if [ $cpu != "sparc" ] ; then
>> -    echo   
>> ':sparc:M::\x7fELF\x01\x02\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x02:\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff:/usr/local/bin/qemu-sparc:'
>>  > /proc/sys/fs/binfmt_misc/register
>> -fi
>> -if [ $cpu != "ppc" ] ; then
>> -    echo   
>> ':ppc:M::\x7fELF\x01\x02\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x14:\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff:/usr/local/bin/qemu-ppc:'
>>  > /proc/sys/fs/binfmt_misc/register
>> -fi
>> -if [ $cpu != "m68k" ] ; then
>> -    echo   'Please check cpu value and header information for m68k!'
>> -    echo   
>> ':m68k:M::\x7fELF\x01\x02\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x04:\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff:/usr/local/bin/qemu-m68k:'
>>  > /proc/sys/fs/binfmt_misc/register
>> -fi
>> -if [ $cpu != "mips" ] ; then
>> -    # FIXME: We could use the other endianness on a MIPS host.
>> -    echo   
>> ':mips:M::\x7fELF\x01\x02\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x08:\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff:/usr/local/bin/qemu-mips:'
>>  > /proc/sys/fs/binfmt_misc/register
>> -    echo   
>> ':mipsel:M::\x7fELF\x01\x01\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x08\x00:\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff\xff:/usr/local/bin/qemu-mipsel:'
>>  > /proc/sys/fs/binfmt_misc/register
>> -    echo   
>> ':mipsn32:M::\x7fELF\x01\x02\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x08:\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff:/usr/local/bin/qemu-mipsn32:'
>>  > /proc/sys/fs/binfmt_misc/register
>> -    echo   
>> ':mipsn32el:M::\x7fELF\x01\x01\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x08\x00:\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff\xff:/usr/local/bin/qemu-mipsn32el:'
>>  > /proc/sys/fs/binfmt_misc/register
>> -    echo   
>> ':mips64:M::\x7fELF\x02\x02\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x08:\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff:/usr/local/bin/qemu-mips64:'
>>  > /proc/sys/fs/binfmt_misc/register
>> -    echo   
>> ':mips64el:M::\x7fELF\x02\x01\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x08\x00:\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff\xff:/usr/local/bin/qemu-mips64el:'
>>  > /proc/sys/fs/binfmt_misc/register
>> -fi
>> -if [ $cpu != "sh" ] ; then
>> -    echo    
>> ':sh4:M::\x7fELF\x01\x01\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x2a\x00:\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff\xff:/usr/local/bin/qemu-sh4:'
>>  > /proc/sys/fs/binfmt_misc/register
>> -    echo    
>> ':sh4eb:M::\x7fELF\x01\x02\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x2a:\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff:/usr/local/bin/qemu-sh4eb:'
>>  > /proc/sys/fs/binfmt_misc/register
>> -fi
>> -if [ $cpu != "s390x" ] ; then
>> -    echo   
>> ':s390x:M::\x7fELF\x02\x02\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x16:\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff:/usr/local/bin/qemu-s390x:'
>>  > /proc/sys/fs/binfmt_misc/register
>> -fi
>> +qemu_target_list="i386 i486 alpha arm sparc32plus ppc ppc64 ppc64le m68k \
>> +mips mipsel mipsn32 mipsn32el mips64 mips64el \
>> +sh4 sh4eb s390x aarch64"
>> +
>> +i386_magic='\x7fELF\x01\x01\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x03\x00'
>> +i386_mask='\xff\xff\xff\xff\xff\xfe\xfe\xff\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff\xff'
>> +i386_family=i386
>> +
>> +i486_magic='\x7fELF\x01\x01\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x06\x00'
>> +i486_mask='\xff\xff\xff\xff\xff\xfe\xfe\xff\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff\xff'
>> +i486_family=i386
>> +
>> +alpha_magic='\x7fELF\x02\x01\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x26\x90'
>> +alpha_mask='\xff\xff\xff\xff\xff\xfe\xfe\xff\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff\xff'
>> +alpha_family=alpha
>> +
>> +arm_magic='\x7fELF\x01\x01\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x28\x00'
>> +arm_mask='\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff\xff'
>> +arm_family=arm
>> +
>> +armeb_magic='\x7fELF\x01\x02\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x28'
>> +armeb_mask='\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff'
>> +armeb_family=arm
>> +
>> +sparc_magic='\x7fELF\x01\x02\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x02'
>> +sparc_mask='\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff'
>> +sparc_family=sparc
>> +
>> +sparc32plus_magic='\x7fELF\x01\x02\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x12'
>> +sparc32plus_mask='\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff'
>> +sparc32plus_family=sparc
>> +
>> +ppc_magic='\x7fELF\x01\x02\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x14'
>> +ppc_mask='\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff'
>> +ppc_family=ppc
>> +
>> +ppc64_magic='\x7fELF\x02\x02\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x15'
>> +ppc64_mask='\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff'
>> +ppc64_family=ppc
>> +
>> +ppc64le_magic='\x7fELF\x02\x01\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x15\x00'
>> +ppc64le_mask='\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff\x00'
>> +ppc64le_family=ppcle
>> +
>> +m68k_magic='\x7fELF\x01\x02\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x04'
>> +m68k_mask='\xff\xff\xff\xff\xff\xff\xfe\xfe\xff\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff'
>> +m68k_family=m68k
>> +
>> +# FIXME: We could use the other endianness on a MIPS host.
>> +
>> +mips_magic='\x7fELF\x01\x02\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x08'
>> +mips_mask='\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff'
>> +mips_family=mips
>> +
>> +mipsel_magic='\x7fELF\x01\x01\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x08\x00'
>> +mipsel_mask='\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff\xff'
>> +mipsel_family=mips
>> +
>> +mipsn32_magic='\x7fELF\x01\x02\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x08'
>> +mipsn32_mask='\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff'
>> +mipsn32_family=mips
>> +
>> +mipsn32el_magic='\x7fELF\x01\x01\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x08\x00'
>> +mipsn32el_mask='\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff\xff'
>> +mipsn32el_family=mips
>> +
>> +mips64_magic='\x7fELF\x02\x02\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x08'
>> +mips64_mask='\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff'
>> +mips64_family=mips
>> +
>> +mips64el_magic='\x7fELF\x02\x01\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x08\x00'
>> +mips64el_mask='\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff\xff'
>> +mips64el_family=mips
>> +
>> +sh4_magic='\x7fELF\x01\x01\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x2a\x00'
>> +sh4_mask='\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff\xff'
>> +sh4_family=sh4
>> +
>> +sh4eb_magic='\x7fELF\x01\x02\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x2a'
>> +sh4eb_mask='\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff'
>> +sh4eb_family=sh4
>> +
>> +s390x_magic='\x7fELF\x02\x02\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x16'
>> +s390x_mask='\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff'
>> +s390x_family=s390x
>> +
>> +aarch64_magic='\x7fELF\x02\x01\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\xb7\x00'
>> +aarch64_mask='\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff\xff'
>> +aarch64_family=arm
>> +
>> +qemu_get_family() {
>> +    cpu=${HOST_ARCH:-$(uname -m)}
>> +    case "$cpu" in
>> +    amd64|i386|i486|i586|i686|i86pc|BePC|x86_64)
>> +        echo "i386"
>> +        ;;
>> +    mips*)
>> +        echo "mips"
>> +        ;;
>> +    "Power Macintosh"|ppc64|powerpc|ppc)
>> +        echo "ppc"
>> +        ;;
>> +    ppc64el|ppc64le)
>> +        echo "ppcle"
>> +        ;;
>> +    arm|armel|armhf|arm64|armv[4-9]*)
>> +        echo "arm"
>> +        ;;
>> +    sparc*)
>> +        echo "sparc"
>> +        ;;
>> +    *)
>> +        echo "$cpu"
>> +        ;;
>> +    esac
>> +}
>> +
>> +usage() {
>> +    cat <<EOF
>> +Usage: qemu-binfmt-conf.sh [--qemu-path PATH][--debian][--systemd CPU]
>> +                           [--help][--credential yes|no][--exportdir PATH]
>> +
>> +       Configure binfmt_misc to use qemu interpreter
>> +
>> +       --help:       display this usage
>> +       --qemu-path:  set path to qemu interpreter ($QEMU_PATH)
>> +       --debian:     don't write into /proc,
>> +                     instead generate update-binfmts templates
>> +       --systemd:    don't write into /proc,
>> +                     instead generate file for systemd-binfmt.service
>> +                     for the given CPU
>> +       --exportdir:  define where to write configuration files
>> +                     (default: $SYSTEMDDIR or $DEBIANDIR)
>> +       --credential: if yes, credential and security tokens are
>> +                     calculated according to the binary to interpret
>> +
>> +    To import templates with update-binfmts, use :
>> +
>> +        sudo update-binfmts --importdir ${EXPORTDIR:-$DEBIANDIR} --import 
>> qemu-CPU
>> +
>> +    To remove interpreter, use :
>> +
>> +        sudo update-binfmts --package qemu-CPU --remove qemu-CPU $QEMU_PATH
>> +
>> +    With systemd, binfmt files are loaded by systemd-binfmt.service
>> +
>> +    The environment variable HOST_ARCH allows to override 'uname' to 
>> generate
>> +    configuration files for a different architecture than the current one.
>> +
>> +    where CPU is one of:
>> +
>> +        $qemu_target_list
>> +
>> +EOF
>> +}
>> +
>> +qemu_check_access() {
>> +    if [ ! -w "$1" ] ; then
>> +        echo "ERROR: cannot write to $1" 1>&2
>> +        exit 1
>> +    fi
>> +}
>> +
>> +qemu_check_bintfmt_misc() {
>> +    # load the binfmt_misc module
>> +    if [ ! -d /proc/sys/fs/binfmt_misc ]; then
>> +      if ! /sbin/modprobe binfmt_misc ; then
>> +          exit 1
>> +      fi
>> +    fi
>> +    if [ ! -f /proc/sys/fs/binfmt_misc/register ]; then
>> +      if ! mount binfmt_misc -t binfmt_misc /proc/sys/fs/binfmt_misc ; then
>> +          exit 1
>> +      fi
>> +    fi
>> +
>> +    qemu_check_access /proc/sys/fs/binfmt_misc/register
>> +}
>> +
>> +installed_dpkg() {
>> +    dpkg --status "$1" > /dev/null 2>&1
>> +}
>> +
>> +qemu_check_debian() {
>> +    if [ ! -e /etc/debian_version ] ; then
>> +        echo "WARNING: your system is not a Debian based distro" 1>&2
>> +    elif ! installed_dpkg binfmt-support ; then
>> +        echo "WARNING: package binfmt-support is needed" 1>&2
>> +    fi
>> +    qemu_check_access "$EXPORTDIR"
>> +}
>> +
>> +qemu_check_systemd() {
>> +    if ! systemctl -q is-enabled systemd-binfmt.service ; then
>> +        echo "WARNING: systemd-binfmt.service is missing or disabled" 1>&2
>> +    fi
>> +    qemu_check_access "$EXPORTDIR"
>> +}
>> +
>> +qemu_generate_register() {
>> +    echo ":qemu-$cpu:M::$magic:$mask:$qemu:$FLAGS"
>> +}
>> +
>> +qemu_register_interpreter() {
>> +    echo "Setting $qemu as binfmt interpreter for $cpu"
>> +    qemu_generate_register > /proc/sys/fs/binfmt_misc/register
>> +}
>> +
>> +qemu_generate_systemd() {
>> +    echo "Setting $qemu as binfmt interpreter for $cpu for 
>> systemd-binfmt.service"
>> +    qemu_generate_register > "$EXPORTDIR/qemu-$cpu.conf"
>> +}
>> +
>> +qemu_generate_debian() {
>> +    cat > "$EXPORTDIR/qemu-$cpu" <<EOF
>> +package qemu-$cpu
>> +interpreter $qemu
>> +magic $magic
>> +mask $mask
>> +EOF
>> +    if [ "$FLAGS" = "OC" ] ; then
>> +        echo "credentials yes" >> "$EXPORTDIR/qemu-$cpu"
>> +    fi
>> +}
>> +
>> +qemu_set_binfmts() {
>> +    # probe cpu type
>> +    host_family=$(qemu_get_family)
>> +
>> +    # register the interpreter for each cpu except for the native one
>> +
>> +    for cpu in ${qemu_target_list} ; do
>> +        magic=$(eval echo \$${cpu}_magic)
>> +        mask=$(eval echo \$${cpu}_mask)
>> +        family=$(eval echo \$${cpu}_family)
>> +
>> +        if [ "$magic" = "" ] || [ "$mask" = "" ] || [ "$family" = "" ] ; 
>> then
>> +            echo "INTERNAL ERROR: unknown cpu $cpu" 1>&2
>> +            continue
>> +        fi
>> +
>> +        qemu="$QEMU_PATH/qemu-$cpu"
>> +        if [ "$cpu" = "i486" ] ; then
>> +            qemu="$QEMU_PATH/qemu-i386"
>> +        fi
>> +
>> +        if [ "$host_family" != "$family" ] ; then
>> +            $BINFMT_SET
>> +        fi
>> +    done
>> +}
>> +
>> +CHECK=qemu_check_bintfmt_misc
>> +BINFMT_SET=qemu_register_interpreter
>> +
>> +SYSTEMDDIR="/etc/binfmt.d"
>> +DEBIANDIR="/usr/share/binfmts"
>> +
>> +QEMU_PATH=/usr/local/bin
>> +FLAGS=""
>> +
>> +options=$(getopt -o ds:Q:e:hc: -l 
>> debian,systemd:,qemu-path:,exportdir:,help,credential: -- "$@")
>> +eval set -- "$options"
>> +
>> +while true ; do
>> +    case "$1" in
>> +    -d|--debian)
>> +        CHECK=qemu_check_debian
>> +        BINFMT_SET=qemu_generate_debian
>> +        EXPORTDIR=${EXPORTDIR:-$DEBIANDIR}
>> +        ;;
>> +    -s|--systemd)
>> +        CHECK=qemu_check_systemd
>> +        BINFMT_SET=qemu_generate_systemd
>> +        EXPORTDIR=${EXPORTDIR:-$SYSTEMDDIR}
>> +        shift
>> +        # check given cpu is in the supported CPU list
>> +        for cpu in ${qemu_target_list} ; do
>> +            if [ "$cpu" == "$1" ] ; then
>> +                break
>> +            fi
>> +        done
>> +
>> +        if [ "$cpu" == "$1" ] ; then
>> +            qemu_target_list="$1"
>> +        else
>> +            echo "ERROR: unknown CPU \"$1\"" 1>&2
>> +            usage
>> +            exit 1
>> +        fi
>> +        ;;
>> +    -Q|--qemu-path)
>> +        shift
>> +        QEMU_PATH="$1"
>> +        ;;
>> +    -e|--exportdir)
>> +        shift
>> +        EXPORTDIR="$1"
>> +        ;;
>> +    -h|--help)
>> +        usage
>> +        exit 1
>> +        ;;
>> +    -c|--credential)
>> +        shift
>> +        if [ "$1" = "yes" ] ; then
>> +            FLAGS="OC"
>> +        else
>> +            FLAGS=""
>> +        fi
>> +        ;;
>> +    *)
>> +        break
>> +        ;;
>> +    esac
>> +    shift
>> +done
>> +
>> +$CHECK
>> +qemu_set_binfmts
>>



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