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detect.go
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detect.go
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/*
* Copyright 2018-2020 the original author or authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* https://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package executable
import (
"fmt"
"github.com/buildpacks/libcnb"
"github.com/paketo-buildpacks/libjvm"
"github.com/paketo-buildpacks/libpak"
"github.com/paketo-buildpacks/libpak/bard"
)
const (
PlanEntryJVMApplication = "jvm-application"
PlanEntryJVMApplicationPackage = "jvm-application-package"
PlanEntryJRE = "jre"
PlanEntryWatchexec = "watchexec"
PlanEntrySyft = "syft"
)
type Detect struct{
Logger bard.Logger
}
func (d Detect) Detect(context libcnb.DetectContext) (libcnb.DetectResult, error) {
cr, err := libpak.NewConfigurationResolver(context.Buildpack, &d.Logger)
if err != nil {
return libcnb.DetectResult{}, fmt.Errorf("unable to create configuration resolver\n%w", err)
}
result := libcnb.DetectResult{
Pass: true,
Plans: []libcnb.BuildPlan{
{
Provides: []libcnb.BuildPlanProvide{
{Name: PlanEntryJVMApplication},
},
Requires: []libcnb.BuildPlanRequire{
{Name: PlanEntrySyft},
{Name: PlanEntryJRE, Metadata: map[string]interface{}{"launch": true}},
{Name: PlanEntryJVMApplicationPackage},
{Name: PlanEntryJVMApplication},
},
},
},
}
m, err := libjvm.NewManifest(context.Application.Path)
if err != nil {
return libcnb.DetectResult{}, fmt.Errorf("unable to read manifest in %s\n%w", context.Application.Path, err)
}
if _, ok := m.Get("Main-Class"); ok {
d.Logger.Info("PASSED: 'Main-Class' manifest attribute found")
result.Plans[0].Provides = append(result.Plans[0].Provides, libcnb.BuildPlanProvide{Name: PlanEntryJVMApplicationPackage})
}
if cr.ResolveBool("BP_LIVE_RELOAD_ENABLED") {
for i := range result.Plans {
result.Plans[i].Requires = append(result.Plans[i].Requires, libcnb.BuildPlanRequire{
Name: PlanEntryWatchexec,
})
}
}
return result, nil
}