os/arch: add bootstrap script for new Arch builds

os/arch/bootstrap

@@ -0,0 +1,61 @@
+#!/usr/bin/env bash
+
+# This script bootstraps arch linux with the utmost essentials. It expects an internet
+# connection, and the harddrives to be set up (and one of the mounted to /mnt).
+
+MOUNT=/mnt
+USERNAME=hlissner
+
+exists() { command -v "$1" >/dev/null; }
+arch() { arch-chroot "$MOUNT" /bin/bash -c "$1"; }
+pac() { pacstrap "$MOUNT" $@; }
+
+if ! exists arch-chroot; then
+    >&2 echo "Meant to be run from the Arch Linux installer"
+    exit 1
+elif ! grep "$MOUNT " /proc/mounts >/dev/null; then
+    >&2 echo "$MOUNT isn't mounted"
+    exit 2
+elif ! echo -e "GET http://google.com HTTP/1.0\n\n" | nc google.com 80 > /dev/null 2>&1; then
+    >&2 echo "No internet connection detected!"
+    exit 3
+fi
+
+# bootstrap
+pac base base-devel intel-ucode
+# device mounting drivers
+pac dosfstools ntfs-3g exfat-utils hfsprogs
+
+# hostname
+read -p "Enter computer hostname: " host
+echo "$host" > "$MOUNT/etc/hostname"
+
+# networking support
+WIRELESS_DEV=$(ip link | grep wlp | awk '{print $2}'| sed 's/://' | sed '1!d')
+if [[ $WIRELESS_DEV ]]; then
+    echo "==> ${WIRELESS_DEV} interface detected"
+    pac iw wireless_tools wpa_actiond wpa_supplicant dialog
+fi
+
+WIRED_DEV=$(ip link | grep "en[sop]" | awk '{print $2}'| sed 's/://' | sed '1!d')
+if [[ $WIRED_DEV ]]; then
+    echo "==> ${WIRED_DEV} interface detected"
+    arch "systemctl enable dhcpcd@${WIRED_DEV}.service"
+fi
+# Speed up connections on boot
+if ! grep "^noarp$" $MOUNT/etc/dhcpcd.conf; then
+    echo -e "\nnoarp" >> $MOUNT/etc/dhcpcd.conf
+fi
+
+# locale
+sed -i '/^#en_US\.UTF-8/s/^#//' $MOUNT/etc/locale.gen
+arch "locale-gen"
+# datetime
+pac ntp
+arch "systemctl enable ntpd.service"
+arch "ln -sfv /usr/share/zoneinfo/America/Toronto /etc/localtime"
+
+# finalization
+genfstab -U "$MOUNT" >> "$MOUNT/etc/fstab"
+arch "bootctl --path=/boot install"
+arch "mkinitcpio -p linux"