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donovanglover-nix-config/.archlinux/install-scripts/004-postinstall

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#!/bin/sh
#
# Common post-install system configuration that doesn't involve any
# external packages (besides fish)
#
# https://wiki.archlinux.org/index.php/General_recommendations
set -xe
# Enable the DHCP client daemon service
arch-chroot /mnt ln -sf /usr/lib/systemd/system/dhcpcd.service \
/etc/systemd/system/multi-user.target.wants/dhcpcd.service
# Enable the timesync daemon service (sync the time periodically with a remote server)
arch-chroot /mnt ln -sf /usr/lib/systemd/system/systemd-timesyncd.service \
/etc/systemd/system/sysinit.target.wants/systemd-timesyncd.service
# Enable colors in pacman by uncommenting the Color line.
sed -i '/Color/s/^#//g' /etc/pacman.conf
sed -i '/VerbosePkgLists/s/^#//g' /etc/pacman.conf
# Give users in the wheel group permission to use sudo
echo "%wheel ALL=(ALL) ALL" >> /etc/sudoers
# Create a new user account with sudo privileges and the fish shell.
arch-chroot /mnt useradd -m -g users -G wheel -s /usr/bin/fish "$USERNAME"
# Then, set the password equal to the username (change this later).
echo "$USERNAME:$USERNAME" | chpasswd