/
lifecycle.go
121 lines (103 loc) · 2.58 KB
/
lifecycle.go
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package builder
import (
"archive/tar"
"fmt"
"io"
"path"
"regexp"
"github.com/pkg/errors"
"github.com/buildpacks/pack/internal/archive"
)
// A snapshot of the latest tested lifecycle version values
const (
DefaultLifecycleVersion = "0.9.1"
DefaultBuildpackAPIVersion = "0.2"
)
// Blob is an interface to wrap opening blobs
type Blob interface {
Open() (io.ReadCloser, error)
}
// Lifecycle is an implementation of the CNB Lifecycle spec
//go:generate mockgen -package testmocks -destination testmocks/mock_lifecycle.go github.com/buildpacks/pack/internal/builder Lifecycle
type Lifecycle interface {
Blob
Descriptor() LifecycleDescriptor
}
type lifecycle struct {
descriptor LifecycleDescriptor
Blob
}
// NewLifecycle creates a Lifecycle from a Blob
func NewLifecycle(blob Blob) (Lifecycle, error) {
var err error
br, err := blob.Open()
if err != nil {
return nil, errors.Wrap(err, "open lifecycle blob")
}
defer br.Close()
_, buf, err := archive.ReadTarEntry(br, "lifecycle.toml")
if err != nil && errors.Cause(err) == archive.ErrEntryNotExist {
return nil, err
} else if err != nil {
return nil, errors.Wrap(err, "reading lifecycle descriptor")
}
lifecycleDescriptor, err := ParseDescriptor(string(buf))
if err != nil {
return nil, err
}
lifecycle := &lifecycle{Blob: blob, descriptor: CompatDescriptor(lifecycleDescriptor)}
if err = lifecycle.validateBinaries(); err != nil {
return nil, errors.Wrap(err, "validating binaries")
}
return lifecycle, nil
}
// Descriptor returns the LifecycleDescriptor
func (l *lifecycle) Descriptor() LifecycleDescriptor {
return l.descriptor
}
func (l *lifecycle) validateBinaries() error {
rc, err := l.Open()
if err != nil {
return errors.Wrap(err, "create lifecycle blob reader")
}
defer rc.Close()
regex := regexp.MustCompile(`^[^/]+/([^/]+)$`)
headers := map[string]bool{}
tr := tar.NewReader(rc)
for {
header, err := tr.Next()
if err == io.EOF {
break
}
if err != nil {
return errors.Wrap(err, "failed to get next tar entry")
}
pathMatches := regex.FindStringSubmatch(path.Clean(header.Name))
if pathMatches != nil {
headers[pathMatches[1]] = true
}
}
for _, p := range l.binaries() {
_, found := headers[p]
if !found {
_, found = headers[p+".exe"]
if !found {
return fmt.Errorf("did not find '%s' in tar", p)
}
}
}
return nil
}
// Binaries returns a list of all binaries contained in the lifecycle.
func (l *lifecycle) binaries() []string {
binaries := []string{
"detector",
"restorer",
"analyzer",
"builder",
"exporter",
"launcher",
"creator",
}
return binaries
}