Overwrite referenced files (in .Files) in a Subchart or insert mariadb initial files from a main chart

Since your mariadb is a subchart managed by third party, .Files.Glob refers only to files inside mariadb directory.

If you want to place any startup scripts inside subchart, you have to unarchive it.

Let's say you have custom-init-scripts directory with all init scripts in your parent chart.

$ ls custom-init-scripts/init.sh  insert.sql# download mariadb chart package in charts directory$ helm dependency update# unarchive and delete package$ tar -xvf charts/mariadb-5.*.tgz -C charts && rm charts/mariadb-5.*.tgz# copy init scripts to mariadb subchart$ cp -a custom-init-scripts/. charts/mariadb/files/docker-entrypoint-initdb.d/

Now your init files are present in mariadb subchart

helm install --debug --dry-run --set mariadb.enabled=true ....---# Source: mychart/charts/mariadb/templates/initialization-configmap.yamlapiVersion: v1kind: ConfigMapmetadata:  name: elevated-dragonfly-mariadb-master-init-scripts  labels:    app: mariadb    component: "master"    chart: mariadb-5.2.5    release: "elevated-dragonfly"    heritage: "Tiller"binaryData:data:  init.sh: "echo \"hi\"\r\n"  insert.sql: INSERT INT Users (FirstName, LastName) VALUES ('A', 'B');