Initial commit. Everything beleived to be i working order.

1 files changed, 137 insertions, 0 deletions

diff --git a/pacman2pacman-get b/pacman2pacman-get
new file mode 100644
index 0000000..7dde661
--- /dev/null
+++ b/pacman2pacman-get
@@ -0,0 +1,137 @@
+#! /bin/bash
+# /usr/bin/pacman2pacman-get
+#
+# 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/>.
+
+
+# Where Pacman2pacman will look to find .torrent files.
+torrents='http://repo.parabolagnulinux.org/torrents/'
+
+# 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="${2}"  # This is where the downloaded file needs to be saved
+                 # or hardlinked
+
+# Check if transmission daemon is running.
+if ! systemctl show --property='ActiveState' transmission | grep -q 'ActiveState=active'
+then
+    echo 'Error: The transmission daemon is not running.'
+    exit 1
+fi
+
+torrent_url="${torrents}${url##*/}.torrent"
+
+cd /srv/pacman2pacman/torrents
+
+# Find the name of the package that will be displayed
+pname="${url##*/}"
+pname="${pname%%-[[:digit:]]*}"
+
+# Check for a .torrent.
+if curl -O -f -L -s -A 'Pacman2pacman' "${torrent_url}"
+then
+    # Add the torrent to transmission
+    transmission-remote -a "${url##*/}.torrent" -w /srv/pacman2pacman/downloads &>/dev/null
+
+    # The torrent is now downloading. To get info about the torrent in
+    # order to display a progress bar we need to know it's id.
+
+    # Find out the id of the torrent
+    id=$(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 download: ${pname}: ${progress}"
+
+    until [[ "${progress}" == '100%' ]]
+    do
+        progress=$(transmission-remote -t "${id}" -i | grep 'Percent Done:')
+        progress="${progress##* }"  # Remove stuff we don't want
+
+        printf "\rPacman2pacman download: %s: %s   " "${pname}" "${progress}"
+
+        sleep 0.7
+    done
+
+    echo
+
+    ln "/srv/pacman2pacman/downloads/${url##*/}" "${filename}" || exit 1
+
+else
+    # 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 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:
+        [[ "${progress}" == '100.0%' ]] && progress='100%'
+
+        printf "\rPacman2pacman download: %s: %s   " "${pname}" "${progress}"
+    done
+
+    echo
+
+    [[ -f "${filename}" ]] || exit 1
+fi
+
+exit