Re: debootrap error

[Claudius Heine <claudius.heine.ext@siemens.com>]

On 19/03/2019 10.09, Jan Kiszka wrote:
> On 19.03.19 09:01, Claudius Heine wrote:
>> On Tue, 2019-03-19 at 08:51 +0100, Jan Kiszka wrote:
>>> On 19.03.19 08:22, Claudius Heine wrote:
>>>> Hi Suzuki-san,
>>>>
>>>> On 19/03/2019 06.18, akihiro27.suzuki@toshiba.co.jp wrote:
>>>>> Hi,
>>>>>
>>>>>>> That is how my qemu-arm setting looks like. Do you have a
>>>>>>> differentqemu path?
>>>>>>>
>>>>>>> $ cat /proc/sys/fs/binfmt_misc/qemu-arm
>>>>>>> enabled
>>>>>>> interpreter /usr/bin/qemu-arm-static
>>>>>>> flags: OCF
>>>>>>> offset 0
>>>>>>> magic 7f454c4601010100000000000000000002002800
>>>>>>> mask ffffffffffffff00fffffffffffffffffeffffff
>>>>> My qemu-arm setting is as follows:
>>>>>
>>>>>       $ cat /proc/sys/fs/binfmt_misc/qemu-arm
>>>>>       enabled
>>>>>       interpreter /usr/bin/qemu-arm
>>>>>       flags: OC
>>>>>       offset 0
>>>>>       magic 7f454c4601010100000000000000000002002800
>>>>>       mask ffffffffffffff00fffffffffffffffffeffffff
>>>>>
>>>>> According to this, the interpreter path was not same.
>>>>> My machine used /usr/bin/qemu-arm but Claudius's machine used
>>>>> /usr/bin/qemu-arm-static.
>>>>>
>>>>> If the first place, my machine didn't have /usr/bin/qemu-arm-
>>>>> static.
>>>>> So, I installed qemu-user-static as follows:
>>>>>
>>>>>       $ sudo aptitude install qemu-user-static
>>>>>       [sudo] password for akihiro:
>>>>>       The following NEW packages will be installed:
>>>>>         qemu-user-static{b}
>>>>>       0 packages upgraded, 1 newly installed, 0 to remove and 0
>>>>> not upgraded.
>>>>>       Need to get 10.0 MB of archives. After unpacking 101 MB will
>>>>> be used.
>>>>>       The following packages have unmet dependencies:
>>>>>        qemu-user-static : Conflicts: qemu-user-binfmt but
>>>>> 1:2.11+dfsg-1ubuntu7.10 is installed
>>>>>        qemu-user-binfmt : Conflicts: qemu-user-static but
>>>>> 1:2.11+dfsg-1ubuntu7.10 is to be installed
>>>>>       The following actions will resolve these dependencies:
>>>>>            Remove the following packages:
>>>>>       1)     qemu-user-binfmt [1:2.11+dfsg-1ubuntu7.10 (bionic-
>>>>> updates, now)]
>>>>>       Accept this solution? [Y/n/q/?] Y
>>>>>       The following NEW packages will be installed:
>>>>>         qemu-user-static
>>>>>       The following packages will be REMOVED:
>>>>>         qemu-user-binfmt{a}
>>>>>       0 packages upgraded, 1 newly installed, 1 to remove and 0
>>>>> not upgraded.
>>>>>       Need to get 10.0 MB of archives. After unpacking 101 MB will
>>>>> be used.
>>>>>       Do you want to continue? [Y/n/?] Y
>>>>>       Get: 1 http://ftp.jaist.ac.jp/pub/Linux/ubuntu bionic-
>>>>> updates/universe
>>>>> amd64 qemu-user-static amd64 1:2.11+dfsg-1ubuntu7.10 [10.0 MB]
>>>>>       Fetched 10.0 MB in 1min 5s (155 kB/s)
>>>>>       (Reading database ... 299683 files and directories currently
>>>>> installed.)
>>>>>       Removing qemu-user-binfmt (1:2.11+dfsg-1ubuntu7.10) ...
>>>>>       Selecting previously unselected package qemu-user-static.
>>>>>       (Reading database ... 299683 files and directories currently
>>>>> installed.)
>>>>>       Preparing to unpack
>>>>> .../qemu-user-static_1%3a2.11+dfsg-1ubuntu7.10_amd64.deb ...
>>>>>       Unpacking qemu-user-static (1:2.11+dfsg-1ubuntu7.10) ...
>>>>>       Setting up qemu-user-static (1:2.11+dfsg-1ubuntu7.10) ...
>>>>>       Processing triggers for man-db (2.8.3-2ubuntu0.1) ...
>>>>>
>>>>> After that, I checked my qemu-arm setting.
>>>>> The interpreter path has been changed to /usr/bin/qemu-arm-static
>>>>> as below:
>>>>>
>>>>>       $ cat /proc/sys/fs/binfmt_misc/qemu-arm
>>>>>       enabled
>>>>>       interpreter /usr/bin/qemu-arm-static
>>>>>       flags: OC
>>>>>       offset 0
>>>>>       magic 7f454c4601010100000000000000000002002800
>>>>>       mask ffffffffffffff00fffffffffffffffffeffffff
>>>>>
>>>>> After that, I built board-bbb.yml as below, and it succeeded!
>>>>>
>>>>>       $ ./kas-docker --isar build kas.yml:board-bbb.yml
>>>>>
>>>>> The root cause of this error is that my machine was not using
>>>>> statically linked user mode qemu binaries?
>>>>
>>>> Well the docker container has the 'qemu-user-static' files
>>>> installed as a
>>>> dependency of qemu-debootstrap. The dynamic linking version would
>>>> not work here,
>>>> because qemu-deboostrap will copy just the one binary to the
>>>> bootstrapped rootfs
>>>> before chrooting into it. The binfmt_misc settings needs to point
>>>> to the qemu
>>>> static binary that was copied to the rootfs for this to work. The
>>>> error of
>>>> course is pretty misleading and stumbled over that very often
>>>> myself.
>>>>
>>>> And what your problem shows as well is that the call of 'update-
>>>> binfmts
>>>> --enable' (which happens in the docker entry point script) does not
>>>> seem to fix
>>>> the path.
>>>
>>> ...which is good to know. Maybe it gets tricked by something being
>>> enabled
>>> already. But I thought I tested this. Anyway, I guess we need to
>>> study that
>>> script /wrt how to achieve some reliable rewriting of the settings.
>>
>> Well you could just call '/var/lib/dpkg/info/qemu-user-static.postinst'
>> from the docker entry point :)
>>
> 
> Ugly... And that call will actually be nop due to how the script works 
> (if it works at all).

Well dpkg-reconfigure would be a bit nicer...

Claudius

> 
> It seems this binfmt installation never worked for the isar-kas
> container:
> 
> builder@384a365634ab:~$ ls /usr/share/binfmts/
> python2.7  python3.5
> 
> And python2.7 does a file installation+ an update-binfmt --import - 
> rather than a --install - during its postinst.
> 
> "For packages, this is preferable to using the --install option, as
> a format file can be installed without update-binfmts needing to be
> available."
> [update-binfmt man page]
> 
> Jan
> 

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