Re: debootrap error

[Jan Kiszka <jan.kiszka@siemens.com>]

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.

Jan

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