add travis caching (1st attempt)

Author: agramfort

.travis.yml

@@ -7,22 +7,41 @@ env:
   global:
     - secure: "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"
 
+cache:
+  ccache: true
+  directories:
+    - $HOME/downloads
+
 matrix:
   include:
     - os: linux
       env:
         - BACKEND=Intel10_64lp_seq
         - BUILD_STATIC=1
-    - os: linux
-      env:
-        - BACKEND=Intel10_64lp
-        - BUILD_STATIC=1
+    # - os: linux
+    #   env:
+    #     - BACKEND=Intel10_64lp
+    #     - BUILD_STATIC=1
 
 before_install:
   # Dependencies required by the CI are installed in ${TRAVIS_BUILD_DIR}/deps/
   - DEPS_DIR="${TRAVIS_BUILD_DIR}/deps"
   - mkdir -p "${DEPS_DIR}"
 
+  - export DL_DIR=$HOME/downloads
+  - |
+    function _download() {
+        url="$1"; f="${2:-$(basename $url)}";
+        if [ ! -e $DL_DIR/$f ] ; then
+          mkdir -p $DL_DIR ;
+          echo "Downloading: ${DL_DIR}/$f" ;
+          travis_retry wget --no-verbose $url -O $DL_DIR/$f ;
+        else
+          echo "Reading from cache: ${DL_DIR}/$f" ;
+        fi
+    }
+  - function download() { _download "$1" "" ; }
+
   # Travis machines have 2 cores
   - JOBS=2
 
@@ -52,8 +71,9 @@ before_install:
     if [[ "${BACKEND}" == *"Intel"* ]]; then
       if [[ "${TRAVIS_OS_NAME}" == "linux" ]]; then
         export MKL_INSTALL_DIR=$(pwd)/intel
-        wget --no-verbose http://registrationcenter-download.intel.com/akdlm/irc_nas/tec/12070/l_mkl_2018.0.128.tgz
-        tar -xzf l_mkl_2018.0.128.tgz
+        export ARCH_FNAME=l_mkl_2018.0.128.tgz
+        download http://registrationcenter-download.intel.com/akdlm/irc_nas/tec/12070/${ARCH_FNAME}
+        tar -xzf $DL_DIR/${ARCH_FNAME}
         cat l_mkl_2018.0.128/silent.cfg | grep -v EULA | grep -v PSET_INSTALL_DIR > silent.cfg
         echo "ACCEPT_EULA=accept" >> silent.cfg
         echo "PSET_INSTALL_DIR=${MKL_INSTALL_DIR}" >> silent.cfg
@@ -62,8 +82,9 @@ before_install:
         . ${MKL_INSTALL_DIR}/mkl/bin/mklvars.sh intel64 ilp64
       else  # Mac
         export MKL_INSTALL_DIR=/opt/intel
-        wget --no-verbose http://registrationcenter-download.intel.com/akdlm/irc_nas/tec/12185/m_mkl_2017.4.220.dmg
-        hdiutil attach m_mkl_2017.4.220.dmg
+        export ARCH_FNAME=m_mkl_2017.4.220.dmg
+        download http://registrationcenter-download.intel.com/akdlm/irc_nas/tec/12185/${ARCH_FNAME}
+        hdiutil attach $DL_DIR/${ARCH_FNAME}
         cat /Volumes/m_mkl_2017.4.220/m_mkl_2017.4.220.app/Contents/MacOS/silent.cfg | grep -v EULA | grep -v PSET_INSTALL_DIR > silent.cfg
         echo "ACCEPT_EULA=accept" >> silent.cfg
         echo "PSET_INSTALL_DIR=${MKL_INSTALL_DIR}" >> silent.cfg