[Cin] Docker

[Andrew Randrianasulu]

I found this page

https://hub.docker.com/r/multiarch/qemu-user-static/

https://stackoverflow.com/questions/72444103/what-does-running-the-multiarch-qemu-user-static-does-before-building-a-containe

seems to work after I

1) installed Docker itself (needs Go language from Google .. quite a beast!
filled 1Gb for its own incremental rebuilds)

2) installed docker-cli from Slackbuilds

3) ran /etc/rc.d/rc docker start (different command on systemd distros)

4) ran
mount binfmt_misc -t binfmt_misc /proc/sys/fs/binfmt_misc

(may be already done by your startup scripts)

5) ran docker run --rm --privileged multiarch/qemu-user-static --reset -p
yes -c yes

6) ran test line
root at slax:~/src/appimagetool# docker run --rm -t --privileged
arm64v8/ubuntu uname -m              WARNING: The requested image's
platform (linux/arm64/v8) does not match the detected host platform
(linux/386) and no specific platform was requested

aarch64
                root at slax:~/src/appimagetool#

for some reason it was not working as root without "privileged"!

But hopefully now I can.download few more linuxes for  exotic arches and
look what their objcopy output looks like! So, hopefully more arches in our
strange image-embedding code soon ;)

Appimagetool build also worked after I added "privileged" to its script!

env ARCH=x86_64  ci/build-in-docker.sh

file appimagetool-x86_64.AppImage*
appimagetool-x86_64.AppImage: ELF 64-bit LSB executable, x86-64, version 1
(SYSV), statically linked,
BuildID[sha1]=9d7e67802fffc45391e9a993c33120227d1b7c78, stripped

so,I am happy Slacker!
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