arm-link

#!/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
ARMBASE=/srv/ftp/archlinux/arm
PKGTREE=packages
PKGFLAT=all
LASTM=month
LASTW=week

[[ $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; }

# nice umask
umask 022

cd "$ARMBASE"

# update last month
ln -snf "$(date +%Y/%m/01)" "$LASTM"

# update last week
ln -snf "$(date -d 'last monday' +%Y/%m/%d)" "$LASTW"


for _d in "$PKGTREE" "$PKGFLAT"; do
  # ensure dir are here
  [[ -e $_d ]] || mkdir -p "$_d"

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

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

# create new links pass
echo ':: creating new links'
find ${1:-"$ARMBASE"/20??} -type f -name '*.pkg.tar.xz'| while read src; do
  filename="${src##*/}"
  pkgname="${filename%-*}" #remove arch and extension
  pkgname="${pkgname%-*}" #remove pkgrel
  pkgname="${pkgname%-*}" #remove pkgver
  first="${pkgname:0:1}"
  parent="$ARMBASE/$PKGTREE/${first,,}/$pkgname"
  # destination in tree
  tdst="$parent/$filename"
  # destination in flat dir
  fdst="$ARMBASE/$PKGFLAT/$filename"
  # ensure pkgtree dad 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.' > "$PKGFLAT"/index.html

touch "$PKGTREE" "$PKGFLAT"

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