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#! /bin/bash
# /usr/bin/pacman2pacman-get
#
# Version 1.4.1
#
# Copyright (C) 2014 Joseph Graham <joseph@t67.eu>
#
# 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 3 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 Affero General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
shopt -s extglob
torrent_folder='/srv/pacman2pacman/torrents'
pkg_cache_location='/var/cache/pacman/pkg'
# Pacman2pacman should be called like this from /etc/pacman.conf:
# XferCommand = /usr/bin/pacman2pacman-get %u %o
# Check that the args are not empty.
[[ -z ${1} ]] && { echo "The first argument should be the download url." ; exit 1 ; }
[[ -z ${2} ]] && { echo "The second argument should be the local filename, plus a “.part” extension." ; exit 1 ; }
url="${1}" # The download url.
filename="${2}" # This is where the downloaded file needs to be saved
# or hardlinked
# Check if transmission daemon is running.
if ! systemctl show --property='ActiveState' transmission | grep -q 'ActiveState=active'
then
echo 'Error: The transmission daemon is not running.'
exit 1
fi
cd "${torrent_folder}"
# Find the name of the package that will be displayed
pname="${url##*/}"
pname="${pname%%-[[:digit:]]*}"
# Find out if it's a dbfile
if [[ "${url}" == *'.db' ]] || [[ "${url}" == *'.db.sig' ]]
then
dbfile=1
else
dbfile=0
fi
# Check for a .torrent.
# We will cycle through the mirrors in the mirrorlist, trying to get
# the torrent file for this package. If it fails we keep trying more
# mirrors until we get a 404 or a success, because only a 404
# indicates that the .torrent does not exist.
# If it's a .db file then we don't even check for a .torrent
if (( dbfile ))
then
response='no_torrent'
else
while read mirror
do
# Remove the `Server = ' part, whether it has spaces or not
mirror="${mirror##Server?( )=?( )}"
torrent_url="${mirror%%\$*}torrents/${url##*/}.torrent"
err=$( curl -O -f -L -s -A 'Pacman2pacman' "${torrent_url}" )
if [[ "${?}" == 0 ]]
then
response='found_torrent'
break
elif [[ "${err}" == *'404'* ]]
then
response='no_torrent'
break
fi
done < <(grep 'Server \?= \?' "/etc/pacman.d/mirrorlist")
fi
# If there's a .torrent we download the package with transmission
# otherwize we just download it by http.
if [[ "${response}" == 'found_torrent' ]]
then
cd "${pkg_cache_location}"
# Add the torrent to transmission
transmission-remote -a "${torrent_folder}/${url##*/}.torrent" -w "${pkg_cache_location}" &>/dev/null
# The torrent is now downloading. To get info about the torrent in
# order to display a progress bar we need to know it's id.
# Find out the id of the torrent
id=$(transmission-remote -l | grep "${url##*/}")
id="${id## }"
id="${id## }"
id="${id## }"
id="${id## }"
id="${id## }"
id="${id## }"
id="${id## }"
id="${id## }"
id="${id## }"
id="${id## }"
id="${id## }" # Once should be enough but somehow it's not so I do
# it loads of times.
id="${id%% *}"
# If there is an error there will be an asterix displayed on the
# end of the id. We must remove it.
id="${id%\*}"
if ! [[ ${id} =~ [[:digit:]] ]]
then
echo 'Error.'
exit 1
fi
# Display a progress bar until it's finished and then hardlink it to
# the right place.
progress='0%'
echo -n "Pacman2pacman p2p download: ${pname}: ${progress}"
until [[ "${progress}" == '100%' ]]
do
progress=$(transmission-remote -t "${id}" -i | grep 'Percent Done:')
progress="${progress##* }" # Remove stuff we don't want
printf "\rPacman2pacman p2p download: %s: %s " "${pname}" "${progress}"
sleep 0.7
done
echo
err_count=0
until mv -f "${pkg_cache_location}/${url##*/}" "${filename}" 2>/dev/null
do
if (( err_count > 50 ))
then
echo "error moving \"${pkg_cache_location}/${url##*/}\""
exit 1
fi
sleep 0.1
(( ++ err_count ))
done
else
cd "${pkg_cache_location}"
# There's no .torrent so we download it by just HTTP.
# We must do some complicated stuff to customise the progress
# meter how we want it, to make it consistent with the progress
# bar when we download stuff with transmission.
progress='0%'
echo -n "Pacman2pacman http download: ${pname}: ${progress}"
# The first loop gets rid of all the backspace and `#'es and
# stuff. The second loop isolates the percent done number.
{
# For dbs we check if they are modified
if (( dbfile ))
then
if [[ -f "/srv/pacman2pacman/dbcache/${filename##*/}" ]]
then
curl -# -f -L -z "/srv/pacman2pacman/dbcache/${filename##*/}" -o "/srv/pacman2pacman/dbcache/${filename##*/}" -A 'Pacman2pacman' "${url}" 2>&1
else
curl -# -f -L -o "/srv/pacman2pacman/dbcache/${filename##*/}" -A 'Pacman2pacman' "${url}" 2>&1
fi
else
curl -# -f -L -o "${filename}" -A 'Pacman2pacman' "${url}" 2>&1
fi
} |
while read -N 1 char
do
[[ "${char}" =~ [[:digit:].%\ ] ]] && echo -n "${char}"
done |
{
while read -d '%' word
do
progress="${word}%"
# There's a crazy bug that causes it to display 100% at the
# start of the download. This should fix it.
[[ "${progress}" == '100.0%' ]] && continue
printf "\rPacman2pacman http download: %s: %s " "${pname}" "${progress}"
done
# It's the end of the download so we can now display 100%
if [[ "${progress}" == '100.0%' ]]
then
progress='100%'
printf "\rPacman2pacman http download: %s: %s " "${pname}" "${progress}"
fi
}
echo
if (( dbfile )) && [[ -f "/srv/pacman2pacman/dbcache/${filename##*/}" ]]
then
cp "/srv/pacman2pacman/dbcache/${filename##*/}" "${filename}" 2>/dev/null
fi
[[ -f "${filename}" ]] || exit 1
fi
exit
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