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build.go
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build.go
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package tini
import (
"os"
"path/filepath"
"time"
"github.com/paketo-buildpacks/packit/v2"
"github.com/paketo-buildpacks/packit/v2/cargo"
"github.com/paketo-buildpacks/packit/v2/chronos"
"github.com/paketo-buildpacks/packit/v2/postal"
"github.com/paketo-buildpacks/packit/v2/sbom"
"github.com/paketo-buildpacks/packit/v2/scribe"
)
//go:generate faux --interface EntryResolver --output fakes/entry_resolver.go
type EntryResolver interface {
Resolve(name string, entries []packit.BuildpackPlanEntry, priorities []interface{}) (packit.BuildpackPlanEntry, []packit.BuildpackPlanEntry)
MergeLayerTypes(name string, entries []packit.BuildpackPlanEntry) (launch, build bool)
}
//go:generate faux --interface DependencyManager --output fakes/dependency_manager.go
type DependencyManager interface {
Resolve(path, id, version, stack string) (postal.Dependency, error)
Deliver(dependency postal.Dependency, cnbPath, layerPath, platformPath string) error
GenerateBillOfMaterials(dependencies ...postal.Dependency) []packit.BOMEntry
}
//go:generate faux --interface SBOMGenerator --output fakes/sbom_generator.go
type SBOMGenerator interface {
GenerateFromDependency(dependency postal.Dependency, dir string) (sbom.SBOM, error)
}
func Build(
entries EntryResolver,
dependencies DependencyManager,
clock chronos.Clock,
logger scribe.Emitter,
sbomGenerator SBOMGenerator,
) packit.BuildFunc {
return func(context packit.BuildContext) (packit.BuildResult, error) {
logger.Title("%s %s", context.BuildpackInfo.Name, context.BuildpackInfo.Version)
entry, _ := entries.Resolve("tini", context.Plan.Entries, nil)
version, ok := entry.Metadata["version"].(string)
if !ok {
version = "default"
}
dependency, err := dependencies.Resolve(
filepath.Join(context.CNBPath, "buildpack.toml"),
entry.Name,
version,
context.Stack)
if err != nil {
return packit.BuildResult{}, err
}
bom := dependencies.GenerateBillOfMaterials(dependency)
launch, build := entries.MergeLayerTypes("tini", context.Plan.Entries)
var buildMetadata packit.BuildMetadata
if build {
buildMetadata.BOM = bom
}
var launchMetadata packit.LaunchMetadata
if launch {
launchMetadata.BOM = bom
}
layer, err := context.Layers.Get(Tini)
if err != nil {
return packit.BuildResult{}, err
}
cachedChecksum, ok := layer.Metadata["dependency-checksum"].(string)
if ok && cargo.Checksum(dependency.Checksum).MatchString(cachedChecksum) {
logger.Process("Reusing cached layer %s", layer.Path)
logger.Break()
layer.Launch, layer.Build, layer.Cache = launch, build, build
return packit.BuildResult{
Layers: []packit.Layer{layer},
Build: buildMetadata,
Launch: launchMetadata,
}, nil
}
logger.Process("Executing build process")
layer, err = layer.Reset()
if err != nil {
return packit.BuildResult{}, err
}
layer.Launch, layer.Build, layer.Cache = launch, build, build
logger.Subprocess("Installing %s %s", dependency.Name, dependency.Version)
err = os.MkdirAll(filepath.Join(layer.Path, "bin"), os.ModePerm)
if err != nil {
return packit.BuildResult{}, err
}
duration, err := clock.Measure(func() error {
d := dependency
d.Name = "tini" // This is to get the correct name on the binary
return dependencies.Deliver(d, context.CNBPath, filepath.Join(layer.Path, "bin"), context.Platform.Path)
})
if err != nil {
return packit.BuildResult{}, err
}
logger.Action("Completed in %s", duration.Round(time.Millisecond))
logger.Break()
logger.GeneratingSBOM(layer.Path)
var sbomContent sbom.SBOM
duration, err = clock.Measure(func() error {
sbomContent, err = sbomGenerator.GenerateFromDependency(dependency, layer.Path)
return err
})
if err != nil {
return packit.BuildResult{}, err
}
logger.Action("Completed in %s", duration.Round(time.Millisecond))
logger.Break()
logger.FormattingSBOM(context.BuildpackInfo.SBOMFormats...)
layer.SBOM, err = sbomContent.InFormats(context.BuildpackInfo.SBOMFormats...)
if err != nil {
return packit.BuildResult{}, err
}
layer.Metadata = map[string]interface{}{
"dependency-checksum": dependency.Checksum,
}
return packit.BuildResult{
Layers: []packit.Layer{layer},
Build: buildMetadata,
Launch: launchMetadata,
}, nil
}
}