Clang Analyze for Gluster

21 Aug 2017 - gluster

Deepshika recently worked on getting a clang analyze job for Gluster setup with Jenkins. This job worked on both our laptops, but not on our build machines that run CentOS. It appears that the problem was clang on CentOS is 3.4 vs 4.0 on Fedora 26. It fails because one of our dependencies need -fno-stack-protector, which wasn’t in clang until 3.8 or so. It’s been on my list of things to fix. I realized that the right way would be to get a newer version of clang on Fedora. I could have just compiled clang or build 4.0 packages but I didn’t want to end up having to maintain the package for our specific install. I decided to reduce complexity by doing a compilation inside a Fedora 6 chroot. This sounded like the least likely to add maintenance burden. When I looked for documentation on how to go about this, I couldn’t find much. The mock man page, however, is very well written and that’s all I needed. This is the script I used comments about each step.

    # Create a new chroot
    sudo mock -r fedora-26-x86_64 --init

    # Install the build dependencies
    sudo mock -r fedora-26-x86_64 --install langpacks-en glibc-langpack-en automake autoconf libtool flex bison openssl-devel libxml2-devel python-devel libaio-devel libibverbs-devel librdmacm-devel readline-devel lvm2-devel glib2-devel userspace-rcu-devel libcmocka-devel libacl-devel sqlite-devel fuse-devel redhat-rpm-config clang clang-analyzer git

    # Copy the Gluster source code inside the chroot at /src
    sudo mock -r fedora-26-x86_64 --copyin $WORKSPACE /src

    # Execute commands in the chroot to build with clang
    sudo mock -r fedora-26-x86_64 --chroot "cd /src && ./"
    sudo mock -r fedora-26-x86_64 --chroot "cd /src && ./configure CC=clang --enable-gnfs --enable-debug"
    sudo mock -r fedora-26-x86_64 --chroot "cd /src && scan-build -o /src/clangScanBuildReports -v -v --use-cc clang --use-analyzer=/usr/bin/clang make"

    # Copy the output back into the working directory
    sudo mock -r fedora-26-x86_64 --copyout /src/clangScanBuildReports $WORKSPACE/clangScanBuildReports

    # Clean up the chroot
    sudo mock -r fedora-26-x86_64 --clean