#!/bin/bash -e

# Copyright © Sébastien Luttringer
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License
# as published by the Free Software Foundation; either version 2
# of the License, or (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.

LOCKFILE=~/."${0##*/}".lock
REPOS=/srv/ftp/archlinux/archive/repos
BASE=/srv/ftp/archlinux/archive/packages
PKGFLAT=.all

[[ $1 != "" && ${1:0:1} != / ]] && { echo 'Absolute path please, ln is bugged'; exit 1; }

# we lock!
exec 9> "$LOCKFILE"
flock -n 9 || { echo 'Locking Failed' >&2; exit 1; }

[[ -t 1 ]] && set -x

# nice umask
umask 022

# ensure dirs are here
[[ -e $BASE/$PKGFLAT ]] || mkdir -p "$BASE/$PKGFLAT"

echo "removing dead links in ${BASE##*/}"
find -L "$BASE" -type l -delete -print

# create new links pass
echo 'creating new links'
find ${1:-$REPOS} -type f -name '*.pkg.tar.xz' -o -name '*.pkg.tar.xz.sig'| while read src; do
  filename="${src##*/}"
  pkgname="${filename%-*}" #remove arch and extension
  pkgname="${pkgname%-*}" #remove pkgrel
  pkgname="${pkgname%-*}" #remove pkgver
  first="${pkgname:0:1}"
  parent="$BASE/${first,,}/$pkgname"
  # destination in tree
  tdst="$parent/$filename"
  # destination in flat dir
  fdst="$BASE/$PKGFLAT/$filename"
  # ensure pkgtree parent dir is present
  [[ -d "$parent" ]] || mkdir -v -p "$parent"
  # copy file if necessary
  if [[ "$src" -nt "$tdst" ]]; then
    # remove is necessary to be done and not use -f in ln
    # because this create buggy relative symlink in some case.
    # there is fix around this in next coreutils
    [[ -e "$tdst" ]] && rm -f -v "$tdst"
    # don't use harlink, to be able to easily remove package by date
    # removing a directory by date, will remove symlink in the clean pass
    ln -v -r -s "$src" "$tdst"
  fi
  if [[ "$src" -nt "$fdst" ]]; then
    [[ -e "$fdst" ]] && rm -f -v "$fdst"
    ln -v -r -s "$src" "$fdst"
  fi
done

# disallow listing of PKGFLAT. Too much file
echo 'No listing allowed here.' > "$BASE/$PKGFLAT/index.html"

echo "removing empty directories in ${BASE##*/}"
find "$BASE" -type d -empty -delete -print

touch "$BASE" "$BASE/$PKGFLAT"

# vim:set sw=2 ts=2 ft=sh et: