Add GitHub Docker action for testing UDP and HTTP file transfers

The Dockerfile works when run locally. The GitHub action
plumbing may or not work in this state.

.github/actions/test-transfer-udp-http/entrypoint.sh

@@ -0,0 +1,119 @@
+#!/bin/bash
+# IPv6 is unfortunately disabled by default in Docker
+# (see sysctl net.ipv6.conf.lo.disable_ipv6)
+
+set -e
+
+# Install programs and build dependencies
+
+if command -v sudo; then
+    SUDO="sudo "
+else
+    SUDO=""
+fi
+
+$SUDO apt-get update
+$SUDO apt-get install -y cmake libssl-dev screen rtorrent mktorrent
+
+rtorrent -h
+
+# Build and start tracker
+
+if [[ -z "${GITHUB_WORKSPACE}" ]]; then
+    cd "$HOME"
+
+    git clone https://github.com/greatest-ape/aquatic.git
+
+    cd aquatic
+else
+    cd "$GITHUB_WORKSPACE"
+fi
+
+cargo build --bin aquatic
+
+echo "log_level = 'debug'
+
+[network]
+address = '127.0.0.1:3000'" > http.toml
+./target/debug/aquatic http -c http.toml &
+
+echo "[network]
+address = '127.0.0.1:3000'" > udp.toml
+screen -dmS aquatic-udp ./target/debug/aquatic udp -c udp.toml
+
+# Setup directories
+
+cd "$HOME"
+
+mkdir seed
+mkdir leech
+mkdir torrents
+
+# Create torrents
+
+echo "http-test-ipv4" > seed/http-test-ipv4
+echo "udp-test-ipv4" > seed/udp-test-ipv4
+
+mktorrent -p -o "torrents/http-ipv4.torrent" -a "http://127.0.0.1:3000/announce" "seed/http-test-ipv4"
+mktorrent -p -o "torrents/udp-ipv4.torrent" -a "udp://127.0.0.1:3000" "seed/udp-test-ipv4"
+
+cp -r torrents torrents-seed
+cp -r torrents torrents-leech
+
+# Start seeding client
+
+echo "directory.default.set = $HOME/seed
+schedule2 = watch_directory,5,5,load.start=$HOME/torrents-seed/*.torrent" > ~/.rtorrent.rc
+
+echo "Starting seeding client"
+screen -dmS rtorrent-seed rtorrent
+
+sleep 10 # Give seeding rtorrent time to load its config file
+
+# Start leeching client
+
+echo "directory.default.set = $HOME/leech
+schedule2 = watch_directory,5,5,load.start=$HOME/torrents-leech/*.torrent" > ~/.rtorrent.rc
+
+echo "Starting leeching client.."
+screen -dmS rtorrent-leech rtorrent
+
+# Check for completion
+
+HTTP_IPv4="Failed"
+UDP_IPv4="Failed"
+
+i="0"
+
+echo "Watching for finished files.."
+
+while [ $i -lt 300 ]
+do
+    if test -f "leech/http-test-ipv4"; then
+        if grep -q "http-test-ipv4" "leech/http-test-ipv4"; then
+            HTTP_IPv4="Ok"
+        fi
+    fi
+    if test -f "leech/udp-test-ipv4"; then
+        if grep -q "udp-test-ipv4" "leech/udp-test-ipv4"; then
+            UDP_IPv4="Ok"
+        fi
+    fi
+
+    if [ "$HTTP_IPv4" = "Ok" ] && [ "$UDP_IPv4" = "Ok" ]; then
+        break
+    fi
+
+    sleep 1
+
+    i=$[$i+1]
+done
+
+echo "Waited for $i seconds"
+
+echo "::set-output name=http_ipv4::$HTTP_IPv4"
+echo "::set-output name=udp_ipv4::$UDP_IPv4"
+
+if [ "$HTTP_IPv4" != "Ok" ] || [ "$UDP_IPv4" != "Ok" ]; then
+    exit 1
+fi