Add script used to build and update website

_build/update_site.sh

@@ -0,0 +1,76 @@
+#!/bin/bash
+
+# This file is licensed under the MIT License (MIT) available on
+# http://opensource.org/licenses/MIT.
+
+PATH=/usr/sbin:/usr/bin:/sbin:/bin:/usr/local/bin
+
+export PATH=/var/lib/gems/1.8/bin/:$PATH
+
+REPO='https://github.com/bitcoin/bitcoin.org.git'
+SITEDIR='/bitcoin.org/site'
+DESTDIR='build@bitcoinorgsite:/var/www/site'
+WORKDIR=`mktemp -d`
+
+# Stop script in case a single command fails
+set -e
+
+# Cleanup on EXIT and kill all subprocesses (even when a command fails)
+trap "rm -rf $WORKDIR; kill 0; exit 1;" EXIT
+trap "rm -rf $WORKDIR; kill 0;" SIGINT
+
+# Clone repository if missing
+if [ ! -d $SITEDIR ]; then
+	git clone $REPO $SITEDIR
+	cd $SITEDIR
+	git reset --hard HEAD~1
+fi
+
+# Exit if no new commit is available
+cd $SITEDIR
+git fetch -a
+LASTLOCALCOMMIT=`git log --format="%H" | head -n1`
+LASTREMOTECOMMIT=`git log origin/master --format="%H" | head -n1`
+if [ $LASTLOCALCOMMIT == $LASTREMOTECOMMIT ]; then
+	exit
+fi
+
+# Update local branch
+git reset --hard origin/master
+git clean -x -f -d
+
+# Copy files to temporary directory
+rsync -rt --delete "$SITEDIR/" "$WORKDIR/"
+
+# Get last modification time for _buildlock
+touch "$SITEDIR/_buildlock"
+lasttime=`stat -c %Y "$SITEDIR/_buildlock" | cut -d ' ' -f1`
+
+# Build website in a child process
+(
+cd $WORKDIR
+JEKYLL_COMMAND='jekyll' make all
+touch "$WORKDIR/_builddone"
+)&
+
+# Loop every 1 second to check status
+while true
+do
+
+	# Update site and exit if site has been successfully built
+	if [ -e "$WORKDIR/_builddone" ]; then
+		rsync --delete -zrt $WORKDIR/_site/ $DESTDIR/
+		exit
+	fi
+
+	# Cancel script if a concurrent script has touched _buildlock
+	time=0
+	if [ -e "$SITEDIR/_buildlock" ]; then
+		time=`stat -c %Y "$SITEDIR/_buildlock" | cut -d ' ' -f1`
+	fi
+	if [ $time != $lasttime ]; then
+		exit
+	fi
+	sleep 1
+
+done