local Prerelease/release jobs fail if ~/.ccache doesnt exist on the host before running the scripts

[mikaelarguedas]

Running prerelease job on Bionic (and Xenial) fails if the directory ~/.ccache doesnt exist on the host machine

When trying to mount the volume the folder is created as root. But the docker container is using a non-root user causing this error to appear.

ccache: error: Failed to create directory /home/buildfarm/.ccache/tmp: Permission denied

full error message

==> cmake /tmp/ws/src/roscpp_core/cpp_common -DCATKIN_DEVEL_PREFIX=/tmp/ws/devel_isolated/cpp_common -DCMAKE_INSTALL_PREFIX=/tmp/ws/install_isolated -DBUILD_TESTING=0 -DCATKIN_SKIP_TESTING=1 -G Unix Makefiles in '/tmp/ws/build_isolated/cpp_common'
-- The C compiler identification is GNU 7.4.0
-- The CXX compiler identification is GNU 7.4.0
-- Check for working C compiler: /usr/lib/ccache/cc
-- Check for working C compiler: /usr/lib/ccache/cc -- broken
CMake Error at /usr/share/cmake-3.10/Modules/CMakeTestCCompiler.cmake:52 (message):
  The C compiler

    "/usr/lib/ccache/cc"

  is not able to compile a simple test program.

  It fails with the following output:

    Change Dir: /tmp/ws/build_isolated/cpp_common/CMakeFiles/CMakeTmp
    
    Run Build Command:"/usr/bin/make" "cmTC_4192b/fast"
    /usr/bin/make -f CMakeFiles/cmTC_4192b.dir/build.make CMakeFiles/cmTC_4192b.dir/build
    make[1]: Entering directory '/tmp/ws/build_isolated/cpp_common/CMakeFiles/CMakeTmp'
    Building C object CMakeFiles/cmTC_4192b.dir/testCCompiler.c.o
    /usr/lib/ccache/cc    -o CMakeFiles/cmTC_4192b.dir/testCCompiler.c.o   -c /tmp/ws/build_isolated/cpp_common/CMakeFiles/CMakeTmp/testCCompiler.c
    ccache: error: Failed to create directory /home/buildfarm/.ccache/tmp: Permission denied
    CMakeFiles/cmTC_4192b.dir/build.make:65: recipe for target 'CMakeFiles/cmTC_4192b.dir/testCCompiler.c.o' failed
    make[1]: *** [CMakeFiles/cmTC_4192b.dir/testCCompiler.c.o] Error 1
    make[1]: Leaving directory '/tmp/ws/build_isolated/cpp_common/CMakeFiles/CMakeTmp'
    Makefile:126: recipe for target 'cmTC_4192b/fast' failed
    make: *** [cmTC_4192b/fast] Error 2
    

  

  CMake will not be able to correctly generate this project.
Call Stack (most recent call first):
  CMakeLists.txt:2 (project)

How to reproduce:

sudo mv ~/.ccache ~/.ccache_old
mkdir -p /tmp/prerelease_ccache_bug && cd /tmp/prerelease_ccache_bug
generate_prerelease_script.py   https://raw.githubusercontent.com/ros-infrastructure/ros_buildfarm_config/production/index.yaml   melodic default ubuntu bionic amd64   roscpp_core   --level 0   --output-dir ./
./prerelease.sh
sudo mv ~/.ccache_old ~/.ccache

Same failure appears with release jobs

[Affonso-Gui]

Was still having this problem a few years later. In my case, the .ccache existed but was owned by root.

Solved by changing the ownership, as pointed out in:
https://answers.ros.org/question/347063/error-pre-release-melodic/