When a custom buildpack is provided for image building, the contents
of the buildpack directory, tgz file, or image are copied as tar
entries to a new layer in the ephemeral builder image. Prior to this
commit, only file entries from the buildpack source were copied as
builder layer tar entries; intermediate directory entries from the
source were not copied. This results in directories being created in
the builder container using default permissions. This worked on most
Linux-like OSs where the default permissions allow others-read
access. On some OSs like Arch Linux where the default directory
permissions do not allow others-read, this prevented the lifecycle
processes from reading the buildpack files.
This commit explicitly creates all intermediate directory tar entries
in the builder image layer to ensure that the buildpack directories
and files can be read by the lifecycle processes.
Fixes gh-26658
Change `SpringBootPlugin.PRODUCTION_RUNTIME_CLASSPATH_NAME` from package
private to public so that it can be accessed in user build scripts.
Fixes gh-26686
This commit modifies the integration tests for the Maven and Gradle
image building goal and task to use a custom builder as a test harness
to verify that the plugins invoke the builder as expected.
Fixes gh-25838
Previously, the targetJavaVersion property of bootBuildImage was set
using the project's target compatibility directly. This meant that
property's value would reflect the configured target compatibility at
the time of the task's creation and any subsequent changes to the
target compatibility would be missed.
This commit updates the registration of the bootBuildImage task to set
the value of the targetJavaVersion property using a provider. This
indirection means that the project's target compatibility isn't read
until the value of the targetJavaVersion is read, allowing any changes
to the target compatibility to be picked up even if they're made after
the bootBuildImage task has been created.
Fixes gh-26297
