Re: fakechroot

[Quirin Gylstorff <quirin.gylstorff@siemens.com>]

On 9/13/19 11:33 AM, 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.
> 

fakechroot, fakeroot and pseudo are all using a similar mechanism by 
modifying the LD_PRELOAD_PATH with there own Libraries and abstracting 
the necessary systemcalls. pseudo uses a sqlite Database to get a 
persistent view on the topic.

> 2. fakechroot fakeroot is reported to work with foreign-arch chroots. Have you
>     tried that?

I will test it.
> 
> With kind regards,
> Baurzhan.
>