Re: fakechroot

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

On 17.09.19 11:14, Henning Schild wrote:
> Am Fri, 13 Sep 2019 11:41:52 +0200
> schrieb "[ext] Jan Kiszka" <jan.kiszka@siemens.com>:
> 
>> On 13.09.19 11:33, Baurzhan Ismagulov wrote:
>>> On Fri, Sep 13, 2019 at 11:08:21AM +0200, Quirin Gylstorff wrote:
>>>> This was only an initial test but with fakechroot and fakeroot it
>>>> should be possible to have a non-priviledged debootstrap and
>>>> chroot process.
>>>>
>>>> - Initial Creating with debootstrap did work. e.g.:
>>>>     fakechroot fakeroot debootstrap buster amd64
>>>> - what also work was using chroot to enter the create rootfs.
>>>>     fakechroot chroot amd64
>>>
>>> Thanks for sharing. That could be a welcome change.
>>>
>>> 1. How does fakechroot fakeroot perform privileged operations like
>>> chown, mknod, accessing other's files, mounting, etc.?
>>>
>>>      We need that information to be consistent across multiple
>>> commands in multiple recipes (bootstrap, customize, install stuff,
>>> deploy, etc.). Wrapping one command is probably possible with any
>>> tool -- but currently I don't see how they could do what we need.
>>>
>>>      Regarding keeping the information across multiple commands,
>>> Yocto's pseudo should allegedly be able to do that (not sure
>>> whether it keeps the state in a daemon or a file). Evaluating that
>>> was our next step (very low prio ATM) -- maybe that could be
>>> interesting for you as well.
>>>
>>> 2. fakechroot fakeroot is reported to work with foreign-arch
>>> chroots. Have you tried that?
>>>    
>>
>> Note that we can't use fakeroot for most package builds because
>> Debian use it as well, and nesting is not supported.
> 
> Are you sure that is an issue, did you try? Most fakeroot aware tools
> will detect that they are already running in fakeroot and will not try
> to nest.

I've ran into problems when nesting inside the build. Maybe the outer fakeroot 
call would detect and avoid that, but I would not bet on that.

Jan

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