#!/bin/bash
#
# Purpose : Keep pacman's mirrorlist on mirrors that are up to date with Arch.
#           A mirror that stops syncing doesn't cause an error: update and
#           version just stop seeing new packages, such as a new kernel.
#
# reflector.timer picks fresh mirrors once a week, and update picks new ones
# straight away when the first mirror falls a day behind (updates.d/10-pacman.sh).
# To choose mirrors yourself, edit /etc/xdg/reflector/reflector.conf: once it
# doesn't start with the CoreDesktop line below, this leaves it alone. To stop
# CoreDesktop changing the mirrorlist at all, add reflector to
# ~/.config/coredesktop/skip-packages.

COREDESKTOP="$HOME/.local/share/coredesktop"

source "$COREDESKTOP/utils.sh"

CONF=/etc/xdg/reflector/reflector.conf
MARKER="# CoreDesktop: choose up-to-date mirrors (system/mirrors.sh)"

install_packages reflector || exit 1
# Skipped in skip-packages
is_installed reflector || exit 0

# Ours, or reflector's own that no one has edited, is ours to replace (pacman
# translates UNMODIFIED, hence LC_ALL=C)
if head -n 1 "$CONF" 2> /dev/null | grep -qxF "$MARKER" \
    || LC_ALL=C pacman -Qii reflector 2> /dev/null | grep -qE "^UNMODIFIED[[:space:]]+$CONF$"; then
  # Mirrors that synced in the last 12 hours, fastest first. --latest rates only
  # the 20 most recently synced, as rating every mirror takes minutes.
  sudo tee "$CONF" > /dev/null << EOF
$MARKER
# Delete the line above to choose your own; CoreDesktop then leaves this alone.
--save /etc/pacman.d/mirrorlist
--protocol https
--age 12
--completion-percent 100
--latest 20
--sort rate
EOF
else
  echo "Keeping your own mirror choices in $CONF."
fi

enable_services reflector.timer

# A failed refresh leaves the mirrorlist as it was
echo "Choosing up-to-date mirrors..."
if ! sudo systemctl start reflector.service; then
  echo "Couldn't choose new mirrors; keeping the ones in /etc/pacman.d/mirrorlist."
fi
exit 0