fix: omit OCI cache handling code if cache isn't specified

Changes in CI file allow to use existing spack deployments w/o cache.

install_spack_env.sh

@@ -16,7 +16,7 @@ EBRAINS_REPO=$3       # location of ebrains-spack-builds repository
 EBRAINS_SPACK_ENV=$4  # name of EBRAINS Spack environment to be created/updated
 UPSTREAM_INSTANCE=$5  # path to Spack instance to use as upstream (optional)
 UPDATE_SPACK_OCI_CACHES=$6 # "true" enables updating the OCI cache for spack sources and build results
-OCI_CACHE_PREFIX=$7
+export OCI_CACHE_PREFIX=$7
 
 # specify location of .spack dir (by default in ~)
 # this is where cache and configuration settings are stored
@@ -82,39 +82,42 @@ spack concretize --force --fresh --test root
 
 export CACHE_SPECFILE=${CACHE_SPECFILE:-"env_specfile.yaml"}
 export YASHCHIKI_HOME=${EBRAINS_REPO}/vendor/yashchiki
-export OCI_CACHE_PREFIX=${OCI_CACHE_PREFIX:-${HARBOR_HOST:-"docker-registry.ebrains.eu"}/${HARBOR_PROJECT:-"esd"}/master}
 export SPACK_CACHE_SOURCE=${SPACK_CACHE_SOURCE:-${INSTALLATION_ROOT}/spack/var/spack/cache}
 export SPACK_CACHE_BUILD=${SPACK_CACHE_BUILD:-${INSTALLATION_ROOT}/spack/var/spack/cache}
 
 # dump dag to file
 spack spec -y > "${CACHE_SPECFILE}"
-# fetch missing sources (if packages not yet installed)
-python3 ${YASHCHIKI_HOME}/fetch_cached_sources.py \
-    --local-cache=${SPACK_CACHE_SOURCE} \
-    --remote-cache-type=oci \
-    --remote-cache=${OCI_CACHE_PREFIX}/source_cache \
-    --yashchiki-home=${YASHCHIKI_HOME} \
-    missing_paths_sources.dat ${CACHE_SPECFILE}
-# fetch missing build results (if packages not yet installed)
-python3 ${YASHCHIKI_HOME}/fetch_cached_buildresults.py \
-    --local-cache=${SPACK_CACHE_BUILD}/build_cache \
-    --remote-cache-type=oci \
-    --remote-cache=${OCI_CACHE_PREFIX}/build_cache \
-    --yashchiki-home=${YASHCHIKI_HOME} \
-    missing_paths_buildresults.dat ${CACHE_SPECFILE}
+if [ -n "${OCI_CACHE_PREFIX}" ]; then
+    # fetch missing sources (if packages not yet installed)
+    python3 ${YASHCHIKI_HOME}/fetch_cached_sources.py \
+        --local-cache=${SPACK_CACHE_SOURCE} \
+        --remote-cache-type=oci \
+        --remote-cache=${OCI_CACHE_PREFIX}/source_cache \
+        --yashchiki-home=${YASHCHIKI_HOME} \
+        missing_paths_sources.dat ${CACHE_SPECFILE}
+    # fetch missing build results (if packages not yet installed)
+    python3 ${YASHCHIKI_HOME}/fetch_cached_buildresults.py \
+        --local-cache=${SPACK_CACHE_BUILD}/build_cache \
+        --remote-cache-type=oci \
+        --remote-cache=${OCI_CACHE_PREFIX}/build_cache \
+        --yashchiki-home=${YASHCHIKI_HOME} \
+        missing_paths_buildresults.dat ${CACHE_SPECFILE}
+fi
 spack-python -c "exit(not len(spack.environment.active_environment().uninstalled_specs()))" && (
     # fetch all sources but delay exit code handling
     spack fetch --dependencies --missing && ret=$? || ret=$?;
-    # push freshly fetched sources to remote cache
-    if [ ${UPDATE_SPACK_OCI_CACHES:-false} = "true" ]; then
-        echo "Performing update of the source cache"
-        python3 ${YASHCHIKI_HOME}/update_cached_sources.py \
-            --local-cache=${SPACK_CACHE_SOURCE} \
-            --remote-cache-type=oci \
-            --remote-cache=${OCI_CACHE_PREFIX}/source_cache \
-            missing_paths_sources.dat;
-    else
-        echo "Updating of the source cache disabled."
+    if [ -n "${OCI_CACHE_PREFIX}" ]; then
+        # push freshly fetched sources to remote cache
+        if [ ${UPDATE_SPACK_OCI_CACHES:-false} = "true" ]; then
+            echo "Performing update of the source cache"
+            python3 ${YASHCHIKI_HOME}/update_cached_sources.py \
+                --local-cache=${SPACK_CACHE_SOURCE} \
+                --remote-cache-type=oci \
+                --remote-cache=${OCI_CACHE_PREFIX}/source_cache \
+                missing_paths_sources.dat;
+        else
+            echo "Updating of the source cache disabled."
+        fi
     fi
     if [ $ret -ne 0 ]; then
         (exit $ret)
@@ -125,15 +128,17 @@ spack-python -c "exit(not len(spack.environment.active_environment().uninstalled
 # (Note: spack expects `build_cache/` below the folder we specify here
 spack mirror add local_cache ${SPACK_CACHE_BUILD}
 
-# record the state of installed/uninstalled packages before actually installing them
-dag_hashes_pre_install=$(spack-python ${YASHCHIKI_HOME}/specfile_dag_hash.py ${CACHE_SPECFILE})
+if [ -n "${OCI_CACHE_PREFIX}" ]; then
+    # record the state of installed/uninstalled packages before actually installing them
+    dag_hashes_pre_install=$(spack-python ${YASHCHIKI_HOME}/specfile_dag_hash.py ${CACHE_SPECFILE})
+fi
 
 # install the environment, use 2 jobs to reduce the amount of required RAM
 # delay exit code until we have updated the cache below
 spack install --no-check-signature -y -j$SPACK_JOBS --fresh --test root && spack_install_ret=$? || spack_install_ret=$?
 
 # no need to update the local cache nor the remote cache if we don't want to update
-if [ ${UPDATE_SPACK_OCI_CACHES:-false} = "true" ]; then
+if [ -n "${OCI_CACHE_PREFIX}" ] && [ ${UPDATE_SPACK_OCI_CACHES:-false} = "true" ]; then
     # push previously missing (but now installed) packages to the local cache
     for dag_hash in $dag_hashes_pre_install; do
         spack buildcache create --unsigned --only package ${SPACK_CACHE_BUILD} /${dag_hash} && ret=$? || ret=$?