GoogleContainerTools / GoogleContainerTools/jib
Jib cannot load images created by bazel rules_oci 2.x
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- Java
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Description
**Environment**:
- Jib Gradle plugin 3.4.5
- Gradle 8.13
- macos
**Description of the issue**:
Jib fails to load images produced with bazel's rules_oci 2.x
https://github.com/bazel-contrib/rules_oci/releases/tag/v2.0.0
This seems to be due to the following change
> Uncompressed archives in the tars attribute is no longer compressed when creating the image, this might make images bigger compared to 1.x. Use pkg_tar#extension or tar#compress attribute to compress the layers beforehand.
When loading an image in from rules_oci, I see the exception
```
* What went wrong:
Execution failed for task ':app:jibBuildTar'.
> com.google.cloud.tools.jib.plugins.common.BuildStepsExecutionException: org.apache.commons.compress.compressors.CompressorException: No Compressor found for the stream signature.
```
That tracks, as there is no longer any compression.
**Expected behavior**:
Build succeeds.
**Steps to reproduce**:
1. start a local registry (`docker run -d -p 5000:5000 --name registry registry`)
2. use bazel and rules_oci to produce a docker image (targeting a local registry, using rules_oci's oci_load)
3. push to the local registry (`docker push localhost:5000/distroless/java21:nonroot`, required as jib can't load registry images)
4. Try to build an image using that registry image (see gradle config below)
**`jib-gradle-plugin` Configuration**:
```groovy
jib {
from {
setAllowInsecureRegistries(true)
image = "localhost:5000/distroless/java21:nonroot"
```
**Log output**:
```
* What went wrong:
Execution failed for task ':app:jibBuildTar'.
> com.google.cloud.tools.jib.plugins.common.BuildStepsExecutionException: org.apache.commons.compress.compressors.CompressorException: No Compressor found for the stream signature.
```
**Additional Information**:
Can be worked around by re-enabling compression as the rules_oci changelog points out.
```
pkg_tar(
name = "tar_java" + version + "_" + arch,
extension = "tar.gz",
```
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