[travis] Readonly ccache for pull requests

Author: m-kuhn

ci/travis/linux/qt4/script.sh

@@ -18,5 +18,10 @@ export PATH=${HOME}/osgeo4travis/bin:${HOME}/osgeo4travis/sbin:${PATH}
 export LD_LIBRARY_PATH=${HOME}/osgeo4travis/lib
 export CTEST_PARALLEL_LEVEL=1
 export CCACHE_CPP2=yes
+export CCACHE_TEMPDIR=/tmp
+if [ "${TRAVIS_PULL_REQUEST}" != "false" ]; then
+  export CCACHE_READONLY=yes
+  chmod -R ugo-w ~/.ccache
+fi
 
 xvfb-run ctest -V -E 'qgis_openstreetmaptest|qgis_wcsprovidertest' -S ./qgis-test-travis.ctest --output-on-failure

ci/travis/linux/qt5/script.sh

@@ -17,6 +17,11 @@ export PYTHONPATH=${HOME}/osgeo4travis/lib/python3.3/site-packages/
 export PATH=${HOME}/osgeo4travis/bin:${HOME}/osgeo4travis/sbin:${PATH}
 export LD_LIBRARY_PATH=${HOME}/osgeo4travis/lib
 export CTEST_PARALLEL_LEVEL=1
+export CCACHE_TEMPDIR=/tmp
+if [ "${TRAVIS_PULL_REQUEST}" != "false" ]; then
+  export CCACHE_READONLY=yes
+  chmod -R ugo-w ~/.ccache
+fi
 
 DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )"