Log output of site building into file, to avoid travis log file limit

See also http://stackoverflow.com/questions/26082444/how-to-work-around-travis-cis-4mb-output-limit/26082445#26082445

.travis/build-push.sh

@@ -10,14 +10,13 @@ else
     mvn deploy -Possrh,pmd-release -B -V
 fi
 
-mvn site site:stage -Psite -B -V
-
+bash .travis/build-site.sh
 
 # create pmd-doc archive
 (
     cd target
     mv staging pmd-doc-${VERSION}
-    zip -r pmd-doc-${VERSION}.zip pmd-doc-${VERSION}/
+    zip -qr pmd-doc-${VERSION}.zip pmd-doc-${VERSION}/
 )
 
 # Uploading pmd distribution to sourceforge
@@ -27,7 +26,7 @@ rsync -avh src/site/markdown/overview/changelog.md ${PMD_SF_USER}@web.sourceforg
 
 if [[ "$VERSION" == *-SNAPSHOT && "$TRAVIS_BRANCH" == "master" ]]; then
     # Uploading snapshot site...
-    rsync -avh --stats --delete target/pmd-doc-${VERSION}/ ${PMD_SF_USER}@web.sourceforge.net:/home/project-web/pmd/htdocs/snapshot/
+    rsync -ah --stats --delete target/pmd-doc-${VERSION}/ ${PMD_SF_USER}@web.sourceforge.net:/home/project-web/pmd/htdocs/snapshot/
 fi
 
 

.travis/build-site.sh

@@ -0,0 +1,48 @@
+#!/bin/bash
+set -ev
+
+# Do not log the output, to avoid the travis log length limit of 4MB
+# Solution from http://stackoverflow.com/questions/26082444/how-to-work-around-travis-cis-4mb-output-limit/26082445#26082445
+
+
+
+export PING_SLEEP=30s
+export BUILD_OUTPUT=/tmp/build-site.out
+export PING_PID_FILE=/tmp/build-site-ping.pid
+
+touch $BUILD_OUTPUT
+
+dump_output() {
+   echo Tailing the last 500 lines of output:
+   tail -500 $BUILD_OUTPUT  
+}
+kill_ping() {
+  if [ -e $PING_PID_FILE ]; then
+    PING_LOOP_PID=$(cat $PING_PID_FILE)
+    kill $PING_LOOP_PID
+    rm $PING_PID_FILE
+  fi
+}
+error_handler() {
+  kill_ping
+  echo ERROR: An error was encountered with the build.
+  dump_output
+  exit 1
+}
+# If an error occurs, run our error handler to output a tail of the build
+trap 'error_handler' ERR
+
+# Set up a repeating loop to send some output to Travis.
+bash -c "while true; do echo \$(date) - building ...; sleep $PING_SLEEP; done" &
+PING_LOOP_PID=$!
+echo "$PING_LOOP_PID" > $PING_PID_FILE
+
+# Run the build, redirect output into the file
+mvn site site:stage -Psite -B -V >> $BUILD_OUTPUT 2>&1
+
+# The build finished without returning an error so dump a tail of the output
+dump_output
+
+# nicely terminate the ping output loop
+kill_ping
+

.travis/install-configure-maven.sh

@@ -5,8 +5,8 @@ set -ev
 SOURCE_HOME=$PWD
 
 cd $HOME
-wget http://apache.claz.org/maven/maven-3/3.3.9/binaries/apache-maven-3.3.9-bin.tar.gz
-tar zxvf apache-maven-3.3.9-bin.tar.gz
+wget -q http://apache.claz.org/maven/maven-3/3.3.9/binaries/apache-maven-3.3.9-bin.tar.gz
+tar zxf apache-maven-3.3.9-bin.tar.gz
 chmod +x apache-maven-3.3.9/bin/mvn
 
 echo "MAVEN_OPTS='-Xms1g -Xmx1g'" > .mavenrc