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

[Laurent Vivier]

Le 25/02/2016 à 17:28, Laurent Vivier a écrit :
> Please, Alex, Michael:
> 
> We need your ack/review.

Someone? :)

Thanks,
Laurent

> Thanks,
> Laurent
> 
> Le 17/02/2016 10:59, Riku Voipio a écrit :
>> 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
>>>>
>>
>