Add rsync script and Dockerfile

Dockerfile

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+FROM alpine:3.4
+MAINTAINER Michael de Wit <michael@drillster.com>
+
+RUN apk add --no-cache ca-certificates bash openssh-client rsync
+COPY upload.sh /usr/local/
+
+ENTRYPOINT ["/usr/local/upload.sh"]

README.md

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+# drone-rsync

upload.sh

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+#!/bin/bash
+
+if [ -z "$PLUGIN_HOSTS" ]; then
+    echo "Specify at least one host!"
+    exit 1
+fi
+
+if [ -z "$PLUGIN_TARGET" ]; then
+    echo "Specify a target!"
+    exit 1
+fi
+
+PORT=$PLUGIN_PORT
+if [ -z "$PLUGIN_PORT" ]; then
+    echo "Port not specified, using default port 22!"
+    PORT=22
+fi
+
+SOURCE=$PLUGIN_SOURCE
+if [ -z "$PLUGIN_SOURCE" ]; then
+    echo "No source folder specified, using default './'"
+    SOURCE="./"
+fi
+
+USER=$RSYNC_USER
+if [ -z "$RSYNC_USER" ]; then
+    if [ -z "$PLUGIN_USER" ]; then
+        echo "No user specified, using root!"
+        USER="root"
+    else
+        USER=$PLUGIN_USER
+    fi
+fi
+
+SSH_KEY=$RSYNC_KEY
+if [ -z "$RSYNC_KEY" ]; then
+    if [ -z "$PLUGIN_KEY" ]; then
+        echo "No private key specified!"
+        exit 1
+    fi
+    SSH_KEY=$PLUGIN_KEY
+fi
+
+# Building rsync command
+expr="rsync -az"
+
+if [[ -n "$PLUGIN_RECURSIVE"  && $PLUGIN_RECURSIVE ]]; then
+    expr="$expr -r"
+fi
+
+if [[ -n "$PLUGIN_DELETE" && $PLUGIN_DELETE ]]; then
+    expr="$expr --del"
+fi
+
+expr="$expr -e 'ssh -p $PORT -o UserKnownHostsFile=/dev/null -o LogLevel=quiet -o StrictHostKeyChecking=no'"
+
+# Include
+IFS=','; read -ra INCLUDE <<< "$PLUGIN_INCLUDE"
+for include in "${INCLUDE[@]}"; do
+    expr="$expr --include=$include"
+done
+
+# Exclude
+IFS=','; read -ra EXCLUDE <<< "$PLUGIN_EXCLUDE"
+for exclude in "${EXCLUDE[@]}"; do
+    expr="$expr --exclude=$exclude"
+done
+
+# Filter
+IFS=','; read -ra FILTER <<< "$PLUGIN_FILTER"
+for filter in "${FILTER[@]}"; do
+    expr="$expr --filter=$filter"
+done
+
+expr="$expr $SOURCE"
+
+# Prepare SSH
+home="/root"
+
+mkdir -p "$home/.ssh"
+
+printf "StrictHostKeyChecking no\n" > "$home/.ssh/config"
+chmod 0700 "$home/.ssh/config"
+
+echo "$SSH_KEY" > "$home/.ssh/id_rsa"
+chmod 0600 "$home/.ssh/id_rsa"
+
+# Parse SSH commands
+function join_with { local d=$1; shift; echo -n "$1"; shift; printf "%s" "${@/#/$d}"; }
+IFS=','; read -ra COMMANDS <<< "$PLUGIN_SCRIPT"
+script=$(join_with ' && ' "${COMMANDS[@]}")
+
+# Run rsync
+IFS=','; read -ra HOSTS <<< "$PLUGIN_HOSTS"
+result=0
+for host in "${HOSTS[@]}"; do
+    echo $(printf "%s" "$ $expr $USER@$host:$PLUGIN_TARGET ...")
+    eval "$expr $USER@$host:$PLUGIN_TARGET"
+    result=$(($result+$?))
+    if [ "$result" -gt "0" ]; then exit $result; fi
+    if [ -n "$PLUGIN_SCRIPT" ]; then
+        echo $(printf "%s" "$ ssh -p $PORT $USER@$host ...")
+        echo $(printf "%s" " > $script ...")
+        eval "ssh -p $PORT $USER@$host '$script'"
+        result=$(($result+$?))
+        echo $(printf "%s" "$ ssh -p $PORT $USER@$host result: $?")
+        if [ "$result" -gt "0" ]; then exit $result; fi
+    fi
+done
+
+exit $result