Fix permissions

ci/docker/install/ubuntu_r.sh

@@ -31,6 +31,12 @@ echo "deb http://cran.rstudio.com/bin/linux/ubuntu trusty/" >> /etc/apt/sources.
 
 apt-key add r.gpg
 
+# We have to install some dependencies during runtime - if somebody knows a better solution,
+# please don't hesitate to replace this!
+# This script is supposed to only be run within Docker, so this should be "safe" to do.
+mkdir -p /usr/local/lib/R/site-library
+chmod 777 /usr/local/lib/R/site-library
+
 # Installing the latest version (3.3+) that is compatible with MXNet
 add-apt-repository 'deb [arch=amd64,i386] https://cran.rstudio.com/bin/linux/ubuntu xenial/'
 
@@ -42,3 +48,8 @@ apt-get install -y --allow-unauthenticated \
     libxt-dev \
     r-base \
     r-base-dev
+
+# Pre-install depenendencies
+Rscript -e "if(!require(devtools)){install.packages('devtools', repo = 'https://cloud.r-project.org/')}"
+Rscript -e "if(!require(devtools)||packageVersion('roxygen2') < '6.1.1'){install.packages('roxygen2', repo = 'https://cloud.r-project.org/')}"
+Rscript -e "library(devtools); library(methods); options(repos=c(CRAN='https://cloud.r-project.org/')); install_deps(pkg='R-package', dependencies = TRUE)"

ci/docker/runtime_functions.sh

@@ -883,6 +883,7 @@ unittest_ubuntu_cpu_R() {
     mkdir -p /tmp/r-site-library
     # build R packages in parallel
     mkdir -p ~/.R/
+    build_ccache_wrappers
     echo  "MAKEFLAGS = -j"$(nproc) > ~/.R/Makevars
     # make -j not supported
     make rpkg                           \
@@ -898,6 +899,7 @@ unittest_ubuntu_gpu_R() {
     mkdir -p /tmp/r-site-library
     # build R packages in parallel
     mkdir -p ~/.R/
+    build_ccache_wrappers
     echo  "MAKEFLAGS = -j"$(nproc) > ~/.R/Makevars
     # make -j not supported
     make rpkg                           \