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stamp.go
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stamp.go
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package configadapter
import (
"context"
"crypto/sha256"
"encoding/base64"
"encoding/hex"
"encoding/json"
"errors"
"fmt"
"sort"
"get.porter.sh/porter/pkg"
"get.porter.sh/porter/pkg/cnab"
"get.porter.sh/porter/pkg/config"
"get.porter.sh/porter/pkg/manifest"
"get.porter.sh/porter/pkg/portercontext"
"get.porter.sh/porter/pkg/tracing"
"github.com/Masterminds/semver/v3"
)
// Stamp contains Porter specific metadata about a bundle that we can place
// in the custom section of a bundle.json
type Stamp struct {
// ManifestDigest takes into account all unique data that goes into a
// porter build to help determine if the last build is stale.
// * manifest
// * mixins
// * (TODO) files in current directory
ManifestDigest string `json:"manifestDigest"`
// Mixins used in the bundle.
Mixins map[string]MixinRecord `json:"mixins"`
// Manifest is the base64 encoded porter.yaml.
EncodedManifest string `json:"manifest"`
// Version and commit define the version of the Porter used when a bundle was built.
Version string `json:"version"`
Commit string `json:"commit"`
}
// DecodeManifest base64 decodes the manifest stored in the stamp
func (s Stamp) DecodeManifest() ([]byte, error) {
if s.EncodedManifest == "" {
return nil, errors.New("no Porter manifest was embedded in the bundle")
}
resultB, err := base64.StdEncoding.DecodeString(s.EncodedManifest)
if err != nil {
return nil, fmt.Errorf("could not base64 decode the manifest in the stamp\n%s: %w", s.EncodedManifest, err)
}
return resultB, nil
}
func (s Stamp) WriteManifest(cxt *portercontext.Context, path string) error {
manifestB, err := s.DecodeManifest()
if err != nil {
return err
}
err = cxt.FileSystem.WriteFile(path, manifestB, pkg.FileModeWritable)
if err != nil {
return fmt.Errorf("could not save decoded manifest to %s: %w", path, err)
}
return nil
}
// MixinRecord contains information about a mixin used in a bundle
// For now it is a placeholder for data that we would like to include in the future.
type MixinRecord struct {
// Name of the mixin used in the bundle. This is used for sorting only, and
// should not be written to the Porter's stamp in bundle.json because we are
// storing these mixin records in a map, keyed by the mixin name.
Name string `json:"-"`
// Version of the mixin used in the bundle.
Version string `json:"version"`
}
type MixinRecords []MixinRecord
func (m MixinRecords) Len() int {
return len(m)
}
func (m MixinRecords) Less(i, j int) bool {
// Currently there can only be a single version of a mixin used in a bundle
// I'm considering version as well for sorting in case that changes in the future once mixins are bundles
// referenced by a bundle, and not embedded binaries
iRecord := m[i]
jRecord := m[j]
if iRecord.Name == jRecord.Name {
// Try to sort by the mixin's semantic version
// If it doesn't parse, just fall through and sort as a string instead
iVersion, iErr := semver.NewVersion(iRecord.Version)
jVersion, jErr := semver.NewVersion(jRecord.Version)
if iErr == nil && jErr == nil {
return iVersion.LessThan(jVersion)
} else {
return iRecord.Version < jRecord.Version
}
}
return iRecord.Name < jRecord.Name
}
func (m MixinRecords) Swap(i, j int) {
tmp := m[i]
m[i] = m[j]
m[j] = tmp
}
func (c *ManifestConverter) GenerateStamp(ctx context.Context) (Stamp, error) {
log := tracing.LoggerFromContext(ctx)
stamp := Stamp{}
// Remember the original porter.yaml, base64 encoded to avoid canonical json shenanigans
rawManifest, err := manifest.ReadManifestData(c.config.Context, c.Manifest.ManifestPath)
if err != nil {
return Stamp{}, err
}
stamp.EncodedManifest = base64.StdEncoding.EncodeToString(rawManifest)
stamp.Mixins = make(map[string]MixinRecord, len(c.Manifest.Mixins))
usedMixins := c.getUsedMixinRecords()
for _, record := range usedMixins {
stamp.Mixins[record.Name] = record
}
digest, err := c.DigestManifest()
if err != nil {
// The digest is only used to decide if we need to rebuild, it is not an error condition to not
// have a digest.
log.Warn(fmt.Sprint("WARNING: Could not digest the porter manifest file: %w", err))
stamp.ManifestDigest = "unknown"
} else {
stamp.ManifestDigest = digest
}
stamp.Version = pkg.Version
stamp.Commit = pkg.Commit
return stamp, nil
}
func (c *ManifestConverter) DigestManifest() (string, error) {
if exists, _ := c.config.FileSystem.Exists(c.Manifest.ManifestPath); !exists {
return "", fmt.Errorf("the specified porter configuration file %s does not exist", c.Manifest.ManifestPath)
}
data, err := c.config.FileSystem.ReadFile(c.Manifest.ManifestPath)
if err != nil {
return "", fmt.Errorf("could not read manifest at %q: %w", c.Manifest.ManifestPath, err)
}
v := pkg.Version
data = append(data, v...)
usedMixins := c.getUsedMixinRecords()
sort.Sort(usedMixins) // Ensure that this is sorted so the digest is consistent
for _, mixinRecord := range usedMixins {
data = append(append(data, mixinRecord.Name...), mixinRecord.Version...)
}
digest := sha256.Sum256(data)
return hex.EncodeToString(digest[:]), nil
}
func LoadStamp(bun cnab.ExtendedBundle) (Stamp, error) {
// TODO(carolynvs): can we simplify some of this by using the extended bundle?
data, ok := bun.Custom[config.CustomPorterKey]
if !ok {
return Stamp{}, fmt.Errorf("porter stamp (custom.%s) was not present on the bundle", config.CustomPorterKey)
}
dataB, err := json.Marshal(data)
if err != nil {
return Stamp{}, fmt.Errorf("could not marshal the porter stamp %q: %w", string(dataB), err)
}
stamp := Stamp{}
err = json.Unmarshal(dataB, &stamp)
if err != nil {
return Stamp{}, fmt.Errorf("could not unmarshal the porter stamp %q: %w", string(dataB), err)
}
return stamp, nil
}
// getUsedMixinRecords returns a list of the mixins used by the bundle, including
// information about the installed mixin, such as its version.
func (c *ManifestConverter) getUsedMixinRecords() MixinRecords {
usedMixins := make(MixinRecords, 0)
for _, usedMixin := range c.Manifest.Mixins {
for _, installedMixin := range c.InstalledMixins {
if usedMixin.Name == installedMixin.Name {
usedMixins = append(usedMixins, MixinRecord{
Name: installedMixin.Name,
Version: installedMixin.GetVersionInfo().Version,
})
}
}
}
sort.Sort(usedMixins)
return usedMixins
}