69 lines
1.6 KiB
Go
69 lines
1.6 KiB
Go
package source
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import (
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"context"
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"os"
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"time"
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spec "github.com/opencontainers/image-spec/specs-go"
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specV1 "github.com/opencontainers/image-spec/specs-go/v1"
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"github.com/pkg/errors"
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)
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// CreateOptions includes data to alter certain knobs when creating a source
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// image.
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type CreateOptions struct {
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// Author is the author of the source image.
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Author string
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// TimeStamp controls whether a "created" timestamp is set or not.
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TimeStamp bool
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}
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// createdTime returns `time.Now()` if the options are configured to include a
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// time stamp.
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func (o *CreateOptions) createdTime() *time.Time {
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if !o.TimeStamp {
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return nil
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}
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now := time.Now()
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return &now
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}
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// Create creates an empty source image at the specified `sourcePath`. Note
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// that `sourcePath` must not exist.
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func Create(ctx context.Context, sourcePath string, options CreateOptions) error {
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if _, err := os.Stat(sourcePath); err == nil {
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return errors.Errorf("error creating source image: %q already exists", sourcePath)
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}
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ociDest, err := openOrCreateSourceImage(ctx, sourcePath)
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if err != nil {
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return err
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}
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// Create and add a config.
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config := ImageConfig{
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Author: options.Author,
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Created: options.createdTime(),
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}
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configBlob, err := addConfig(ctx, &config, ociDest)
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if err != nil {
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return err
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}
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// Create and write the manifest.
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manifest := specV1.Manifest{
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Versioned: spec.Versioned{SchemaVersion: 2},
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Config: specV1.Descriptor{
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MediaType: MediaTypeSourceImageConfig,
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Digest: configBlob.Digest,
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Size: configBlob.Size,
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},
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}
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if _, _, err := writeManifest(ctx, &manifest, ociDest); err != nil {
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return err
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}
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return ociDest.Commit(ctx, nil)
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}
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