[Cin] qemu user mode

[Andrew Randrianasulu]

also, there is additional mechanism used by Termux, it does not require
root-level commands

https://proot-me.github.io/

but you probably can use it on debian/arch/ubuntu..

On Saturday, January 8, 2022, Andrew Randrianasulu <randrianasulu at gmail.com>
wrote:

> should be faster than full VM for compiling, but might not work for
> testing /proc/self pointing at wrong image? also ALSA still not work if
> called under qemu-user, last I checked)
>
> https://wiki.debian.org/QemuUserEmulation
>
> Installing packages
> The binfmt-support package contains a helper script to easily
> register/unregister binary formats with the kernel using the binfmt_misc
> module.
>
> Install qemu, binfmt-support, and qemu-user-static:
>
> # apt install qemu binfmt-support qemu-user-static
> Check whether the binfmt entries were successfully registered:
>
> # update-binfmts --display
> This command should print entries for each supported target user emulator,
> except for the host system.
>
> ===
>
>
> see appendix if you already have chroot folder with arm system
>
> or try to use Raspbian's one from
>
>
> https://wiki.debian.org/RaspberryPi/qemu-user-static
>
> a bit involved when it comes to image resizing...
>
> ===
>
> Note: If the host system is Debian Buster and the chroot will be Debian
> Bullseye, it is good to make sure the host has the version 5.2 of
> qemu-user-static, available from buster-backports. Otherwise some binaries
> may cause qemu-user-static to Seg Fault, see 987497. For example setting
> locale(s) in chroot fails without the upgrade of qemu-user-static.
>
> {..}
> sudo losetup -f -P --show 2020-08-20-raspios-buster-arm64.img
>
>
> Mounting the image
> Mount the image with root permissions:
>
> sudo mount /dev/loop0p2 -o rw /mnt
> Optional: If you want to mount the RaspiOS /boot
>
> sudo mount /dev/loop0p1 -o rw /mnt/boot
> Also mount necessary host directories.
>
> cd /mnt
> sudo mount --bind /dev dev/
> sudo mount --bind /sys sys/
> sudo mount --bind /proc proc/
> sudo mount --bind /dev/pts dev/pts
> (not necessary/advised if you use systemd-nspawn)
>
> To get everything work (e.g., network) you need to comment out everything
> in /mnt/etc/ld.so.preload before you chroot in. Take care of that now!
>
> (not sure if copying qemu binary into chroot still needed on latest
> Debian?)
> cp /usr/bin/qemu-aarch64-static /mnt/usr/bin
>
> or qemu-arm-static for armhf
>
> Now chroot in!
>
> cd /mnt
> (not needed if we already in mnt?)
> sudo chroot . bin/bash
>
> now you can try to get git sources and install usual deps for Cin-gg
> compilation from inside arm/aarch64 chroot and see how far it comes!
>
> ===
>
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