Save cdb for reindexing.

Author: oliverchang

infra/base-images/base-builder/replay_build.sh

@@ -19,4 +19,10 @@ if [ ! -f /usr/bin/bash.real ]; then
   # Only run this once.
   python /usr/local/bin/make_build_replayable.py
 fi
-. $SRC/build.sh "$@"
+
+# If there are cdb fragments saved, restore them to $OUT
+if [ -d /cdb ]; then
+  cp -rT /cdb $OUT/cdb
+fi
+
+. $SRC/build.sh "$@"

infra/build/functions/build_project.py

@@ -553,7 +553,10 @@ def get_indexer_build_steps(project_name,
           'bash', '-c',
           f'cd /src && cd {project.workdir} && mkdir -p {build.out} && '
           '/opt/indexer/index_build.py && '
-          'cp -n /usr/local/bin/replay_build.sh $$SRC/'
+          # Enable re-building both the project and the indexes.
+          'cp -n /usr/local/bin/replay_build.sh $$SRC/ && '
+          # Save the CDB fragments so we can put them together later.
+          'cp -r $$OUT/cdb /cdb'
       ],
       'env': env,
   }