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forgejo-docs/docs/developer/repositories-dependencies.md

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develop/repositories-dependencies: explain the cascading-pr setup It provides two concrete examples to illustrate how they are useful. It also explains how the permissions and tokens are created and installed.
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---
title: Managing dependencies between repositories
license: 'CC-BY-SA-4.0'
---
Some Forgejo repositories that depend on each other have workflows
that will trigger workflows on other repositories using the
[cascading-pr](https://code.forgejo.org/actions/cascading-pr/) action.
# Use cases and examples
## Files copied from other repositories
[setup-forgejo](https://code.forgejo.org/actions/setup-forgejo) contains a [copy](https://code.forgejo.org/actions/setup-forgejo/src/branch/main/forgejo-curl.sh) of the [forgejo-curl](https://code.forgejo.org/forgejo/forgejo-curl) script. This script does not have numbered releases and the latest version is the one in the main branch.
forgejo-curl has a [workflow](https://code.forgejo.org/forgejo/forgejo-curl/src/branch/main/.forgejo/workflows/cascade-setup-forgejo.yml) that will open a pull request to setup-forgejo to [update the forgejo-curl.sh script it contains](https://code.forgejo.org/forgejo/forgejo-curl/src/branch/main/.forgejo/cascading-pr-setup-forgejo). The forgejo-curl workflow will wait on the setup-forgejo workflow and fail if it does not pass, thus providing additional confirmation that the change under test won't break setup-forgejo once merged.
When the PR is merged in forgejo-curl, the corresponding PR in setup-forgejo is left open and ready to be merged with the latest version of the forgejo-curl.sh script.
## Verifying an upgrade would work
[setup-forgejo](https://code.forgejo.org/actions/setup-forgejo) installs a [runner](https://code.forgejo.org/forgejo/runner/) by default, as [specified in the action.yml](https://code.forgejo.org/actions/setup-forgejo/src/commit/a580cb63b6ce411c3394aff77c7073d4d3e9428c/action.yml#L49) file.
The runner has a [workflow](https://code.forgejo.org/forgejo/runner/src/branch/main/.forgejo/workflows/cascade-setup-forgejo.yml) that will open a pull request to setup-forgejo to [update the default version](https://code.forgejo.org/forgejo/runner/src/branch/main/.forgejo/cascading-pr-setup-forgejo) in the action.yml file. The runner workflow will wait on the setup-forgejo workflow and fail if it does not pass, thus providing additional confirmation that the change under test won't break setup-forgejo when it upgrades to using a release that contains the change.
When the PR is merged in forgejo-curl, the corresponding PR in setup-forgejo is closed. It is not meant to upgrade setup-forgejo because there is not yet a tag release published with this change.
# Permissions
The cascading-pr action needs a token with write permissions on issues
developer/repositories-dependencies: no need to add collaborators adding collaborators with write access to the destination repository is a way for the author of a pull request to gain elevated privileges
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and repositories that will allow it to fork the destination repository and
create a pull request from this fork. It also needs read permission
develop/repositories-dependencies: explain the cascading-pr setup It provides two concrete examples to illustrate how they are useful. It also explains how the permissions and tokens are created and installed.
2023-10-26 11:45:06 -04:00
on issues and pull requests for the origin repository.
The [cascading-pr user](https://code.forgejo.org/cascading-pr) is
developer/repositories-dependencies: no need to add collaborators adding collaborators with write access to the destination repository is a way for the author of a pull request to gain elevated privileges
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dedicated to providing such tokens.
develop/repositories-dependencies: explain the cascading-pr setup It provides two concrete examples to illustrate how they are useful. It also explains how the permissions and tokens are created and installed.
2023-10-26 11:45:06 -04:00
For instance, a personal token named
`https://code.forgejo.org/forgejo/forgejo-curl/` was created by the
cascading-pr user. This token was added as two secrets named
`CASCADING_PR_ORIGIN` and `CASCADING_PR_DESTINATION` in the
developer/repositories-dependencies: no need to add collaborators adding collaborators with write access to the destination repository is a way for the author of a pull request to gain elevated privileges
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https://code.forgejo.org/forgejo/forgejo-curl/ repository.
develop/repositories-dependencies: explain the cascading-pr setup It provides two concrete examples to illustrate how they are useful. It also explains how the permissions and tokens are created and installed.
2023-10-26 11:45:06 -04:00
# Access to secrets
The workflow that contains the cascading-pr action needs access to the
secrets of the repository and must run `on.pull_request_target`. For
instance:
```yaml
on:
pull_request_target:
types:
- opened
- synchronize
- closed
```
# Updating the workflow
When the cascading-pr workflow is added or updated in a repository, it
must be done in a PR from a branch of the repository and not than from
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a forked repository. It runs `on.pull_request_target` and if run from
a fork it will use the content of the default branch instead of the
proposed change.
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