$ git clone -n https://src.fedoraproject.org/rpms/llvm.git /var/lib/mock/f41-build-side-1-3069969-38786/root/chroot_tmpdir/scmroot/llvm
Cloning into '/var/lib/mock/f41-build-side-1-3069969-38786/root/chroot_tmpdir/scmroot/llvm'...
$ git fetch origin 4fb09cf1aa3b860c32ff46db312fd03dce1481cf:KOJI_FETCH_HEAD
fatal: unable to access 'https://src.fedoraproject.org/rpms/llvm.git/': OpenSSL SSL_connect: SSL_ERROR_SYSCALL in connection to src.fedoraproject.org:443 
$ git reset --hard 4fb09cf1aa3b860c32ff46db312fd03dce1481cf
HEAD is now at 4fb09cf Update to 19.1.0