arch scripts

It took a moment to work out that there is actually no way of
bootstrapping an arch environment without permanently installing things
to the host system! So we just download a live image and unpack it.

Then after that, getting erlang to work was very easy, just install it,
install zx, run. No R26 incompatibility problems, life is good!

arch/create_environment

@@ -0,0 +1,50 @@
+#!/bin/sh
+
+if test `id -u` -ne 0
+then
+    echo "$0 must be run as root."
+    return
+fi
+
+set -e
+
+ROOT=test_environment
+FRESH=clean_environment
+
+TARBALL=archlinux-bootstrap-x86_64.tar.zst
+REPO="https://geo.mirror.pkgbuild.com"
+
+if test -e "$FRESH"
+then
+    echo "Clean arch environment found at $FRESH. Good."
+else
+    echo "No arch environment found at $FRESH, downloading from $REPO"
+    curl -O "$REPO/iso/latest/$TARBALL"
+    tar -xf "$TARBALL"
+    mv root.x86_64 "$FRESH"
+fi
+
+if test -e "$ROOT"
+then
+    echo "Existing installation found at $ROOT, removing."
+    ./cleanup
+fi
+
+echo "Copying $FRESH to $ROOT."
+cp -r "$FRESH" "$ROOT"
+
+echo "Initializing $ROOT."
+
+./cleanup add_mounts
+
+chmod 1777 "$ROOT/tmp"
+
+echo 'Server = http://ftp.swin.edu.au/archlinux/$repo/os/$arch' > "$ROOT/etc/pacman.d/mirrorlist"
+cp /etc/resolv.conf "$ROOT/etc/resolv.conf"
+
+
+cp -r install_scripts "$ROOT/root"
+
+chroot "$ROOT" /root/install_scripts/user_setup "$@" || echo Script failed.
+
+./cleanup mounts