mattcasters commented on issue #2596:
URL: https://github.com/apache/hop/issues/2596#issuecomment-5015371946
## Parent project support in the Docker basic image
Implemented one-level parent project registration for the official Hop
Docker / Hop Web images so a child project can inherit parent metadata when
both homes are mounted.
### Root cause
The entrypoint only registered `HOP_PROJECT_NAME` / `HOP_PROJECT_FOLDER`.
Parent inheritance in `Project.modifyVariables` looks up the parent in
`hop-config`; if the parent is not registered, its `metadataBaseFolder` is
never merged into `HOP_METADATA_FOLDER`.
### Changes
- **`load-and-execute.sh` / `run-web.sh`**: register the parent project
first (when configured), then the main project with `--project-parent` and
`--project-keep-config-file`.
- **New environment variables**:
- `HOP_PARENT_PROJECT_NAME`
- `HOP_PARENT_PROJECT_FOLDER`
- `HOP_PARENT_PROJECT_CONFIG_FILE_NAME` (default: `project-config.json`)
- **`hop-conf` project-create**: if an existing `project-config.json`
already defines `parentProjectName`, that value is kept instead of always
forcing the standard parent (unless `--project-parent` is set).
- **Docs**: docker container tech manual + hop-web env table, including a
parent-project example.
### Scope
Only **one parent level** is supported via these env vars (as discussed).
Deeper chains would need a follow-up.
### Related
Works together with #2331 (`PARENT_PROJECT_HOME` / `PARENT_PROJECT_NAME`) so
paths and long-lived setups can reference the parent home after the parent is
registered.
### Example
```bash
docker run --rm \
-v /host/projects:/files/projects \
--env HOP_FILE_PATH='jobs/load_projectB_data.hwf' \
--env HOP_PROJECT_FOLDER=/files/projects/projectB \
--env HOP_PROJECT_NAME=projectB \
--env HOP_PARENT_PROJECT_FOLDER=/files/projects/projectA \
--env HOP_PARENT_PROJECT_NAME=projectA \
--env HOP_ENVIRONMENT_NAME=prod_docker_exec \
--env
HOP_ENVIRONMENT_CONFIG_FILE_NAME_PATHS=/files/projects/projectB/prod_docker_exec-config.json
\
--env HOP_RUN_CONFIG=docker_run_config \
apache/hop:<tag>
```
`HOP_PARENT_PROJECT_NAME` should match `parentProjectName` in the child
project’s `project-config.json`.
Commit on branch `eil-friction`: `3830b5f8af` (*Issue #2596 : add parent
project support to Docker basic image*).
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