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[building]: add steps for using container-builder-shim locally (#1279)

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- Update build steps for using the `container-builder-shim` locally

---------

Co-authored-by: jwhur <57657645+JaewonHur@users.noreply.github.com>
This commit is contained in:
Saehej Kang
2026-03-03 08:20:06 -08:00
committed by GitHub
co-authored by jwhur
parent 5917a60339
commit 2204a9470b
1 changed files with 23 additions and 0 deletions
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BUILDING.md
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@@ -127,6 +127,29 @@ To revert to using the Containerization dependency from your `Package.swift`:
bin/container system start
```
## Develop using a local copy of container-builder-shim
To test changes that require the `container-builder-shim` project:
1. Clone the [container-builder-shim](https://github.com/apple/container-builder-shim) repository and navigate to its directory.
2. After making the necessary changes, build the custom builder image, set it as the active builder image, and remove the existing `buildkit` container so the new image will be used:
```bash
container build -t builder .
container system property set image.builder builder:latest
container rm -f buildkit
```
3. Run the `container` build as usual:
```bash
container build ...
```
> [!IMPORTANT]
> If your modified builder image is broken, make sure to rebuild and correctly tag the builder image before attempting to build `container-builder-shim` again.
## Debug XPC Helpers
Attach debugger to the XPC helpers using their launchd service labels: