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Cross-compile Rust on Fedora

These notes will set up a cross-compiling environment for Rust projects using only prebuilt Fedora RPMs with no emulation. While this works, it is unsupported and will leave the system RPM database in an odd state that could result in packages getting out of sync. It should only be used as a temporary measure if at all.

The example commands use aarch64 as the target architecure.

Install a cross-compiling environment for GNU C

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Tectonic virtual install script

This script is a Tectonic installer for local development and testing. It creates a cluster of virtual machines on the same host that runs the script. All files, processes, and any other virtual resources that are created during its execution should be automatically removed on exit.

Dependencies

The first lines in the script list every command dependency, which can be

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#!/bin/bash -e
# Select which Docker version to use on CoreOS with torcx.

# Specify the available Docker version to enable.
version=17.09

# Create modifiable torcx paths if they don't exist already.
mkdir -p /etc/torcx/profiles /var/lib/torcx/store

# Download the torcx manifest file for the currently running OS version.

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#!/bin/bash -ex
# Test IPSec with a tunnel between two containers.

# Provide /proc/net/pfkey since af_key.ko apparently isn't autoloaded.
sudo modprobe af_key

# Start and prepare the containers.
for host in left right
do
        docker run \

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{
  "ignition": { "version": "2.0.0" },
  "systemd": {
    "units": [
      {
        "name": "auto-update-kmods.service",
        "enable": true,
        "contents": "[Unit]\nDescription=Install custom kernel modules\nAfter=lib-modules.mount network-online.target\nRequires=lib-modules.mount network-online.target\nConditionPathExists=!/opt/modules/%v\nConditionPathExistsGlob=/lib/modules/auto-update-kmods.d/*.sh\n\n[Service]\nType=oneshot\nExecStart=/bin/bash -ex /lib/modules/auto-update-kmods.sh\n\n[Install]\nWantedBy=multi-user.target\n"
      },
      {

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#!/bin/bash -e

# Build a CentOS system with the configuration file from CoreOS.
config_url='https://raw.githubusercontent.com/coreos/coreos-overlay/master/app-emulation/wa-linux-agent/files/waagent.conf'
mirrorlist='http://mirrorlist.centos.org/?release=7&arch=x86_64&repo=os'
mirror=$(
         IFS=$'\n' urls=($(curl --location --silent "$mirrorlist"))
         echo "${urls[$((RANDOM % ${#urls[@]}))]}"
)

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/* cc -o noodel -lseccomp noodel.c */
#include <seccomp.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>

int
main (int argc, char *argv[])
{
  scmp_filter_ctx ctx;

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CoreOS Workstation Notes

This is a summary of the system setup used for the demonstration on 2016-07-18.

Goals / Requirements

This was put together with the following intent:

• It must build upon an unmodified CoreOS user space image.

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#cloud-config
hostname: "set-this"

coreos:
  update:
    reboot-strategy: "off"

  units:
    - name: "default.target"
      command: "start"

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[Unit]
Description=Start the local Fedora installation in a container
After=getty@tty2.service getty@tty3.service \
    boot.mount mnt-fedora.mount opt.mount
Conflicts=getty@tty2.service getty@tty3.service
Requires=mnt-fedora.mount
Wants=boot.mount opt.mount

[Service]
Delegate=yes