don't overwrite post-build test logs

install_spack_env.sh

@@ -21,6 +21,9 @@ export SPACK_USER_CONFIG_PATH=$INSTALLATION_ROOT/spack/.spack
 if [ ! -d $INSTALLATION_ROOT/spack ]
 then
   git clone --depth 1 -c advice.detachedHead=false -c feature.manyFiles=true --branch $SPACK_VERSION https://github.com/spack/spack $INSTALLATION_ROOT/spack
+  # SPACK PATCH: the post-build logs on install-time-test-logs.txt gets ovewritten by the post-install logs.
+  # quick fix for that: (TODO: investigate more and open PR)
+  sed -i "s/self.file_like, \"w\"/self.file_like, \"a\"/g" $INSTALLATION_ROOT/spack/lib/spack/llnl/util/tty/log.py
 fi
 
 # copy package settings (modify if necessary) and activate Spack