summaryrefslogtreecommitdiff
path: root/pacman2pacman-get
blob: 6cf2aa6a33e638e619370fd498a41c7069b6ee11 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
#! /bin/bash
# /usr/bin/pacman2pacman-get
#
# Version 1.3.0
#
# 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:]]*}"

# 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.

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")

# 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

    mv -f "${pkg_cache_location}/${url##*/}" "${filename}" || exit 1

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.
    curl -# -f -L -o "${filename}" -A 'Pacman2pacman' "${url}" 2>&1 |
    while read -N 1 char
    do
        [[ "${char}" =~ [[:digit:].%\ ] ]] && echo -n "${char}"
    done |
    while read -d '%' word
    do
        progress="${word}%"

        # For consistency with the transmission progress bar:
        [[ "${progress}" == '100.0%' ]] && progress='100%'

        printf "\rPacman2pacman http download: %s: %s   " "${pname}" "${progress}"
    done

    echo

    [[ -f "${filename}" ]] || exit 1
fi

exit