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Original file line number | Diff line number | Diff line change |
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package app | ||
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import ( | ||
"bufio" | ||
"bytes" | ||
"compress/gzip" | ||
"context" | ||
"encoding/json" | ||
"fmt" | ||
"os" | ||
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toto "github.com/in-toto/in-toto-golang/in_toto" | ||
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//attestTypes "github.com/docker/labs-brown-tape/attest/types" | ||
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"github.com/docker/labs-brown-tape/oci" | ||
) | ||
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type TapeViewCommand struct { | ||
tape *TapeCommand | ||
OutputFormatOptions | ||
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Image string `short:"I" long:"image" description:"Name of the image to view" required:"true"` | ||
} | ||
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type artefactInfo struct { | ||
RawManifests struct { | ||
Index rawManifest[oci.IndexManifest] `json:"index"` | ||
Content rawManifest[oci.Manifest] `json:"content"` | ||
Attest rawManifest[oci.Manifest] `json:"attest"` | ||
} `json:"rawManifests"` | ||
Attestations []toto.Statement `json:"attestations"` | ||
} | ||
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type rawManifest[T oci.Manifest | oci.IndexManifest] struct { | ||
Digest string `json:"digest,omitempty"` | ||
Manifest *T `json:"manifest,omitempty"` | ||
} | ||
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func (c *TapeViewCommand) Execute(args []string) error { | ||
ctx := context.WithValue(c.tape.ctx, "command", "view") | ||
if len(args) != 0 { | ||
return fmt.Errorf("unexpected arguments: %v", args) | ||
} | ||
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if err := c.tape.Init(); err != nil { | ||
return err | ||
} | ||
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client := oci.NewClient(nil) | ||
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outputInfo, err := c.CollectInfo(ctx, client) | ||
if err != nil { | ||
return fmt.Errorf("failed to collect info about artifact: %w", err) | ||
} | ||
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if err := c.PrintInfo(ctx, outputInfo); err != nil { | ||
return fmt.Errorf("failed to print info about artifact: %w", err) | ||
} | ||
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return nil | ||
} | ||
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func (c *TapeViewCommand) CollectInfo(ctx context.Context, client *oci.Client) (*artefactInfo, error) { | ||
artefactInfo := &artefactInfo{} | ||
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imageIndex, indexManifest, _, err := client.GetIndexOrImage(ctx, c.Image) | ||
if err != nil { | ||
return nil, err | ||
} | ||
if indexManifest == nil { | ||
return nil, fmt.Errorf("no index manifest found for %q", c.Image) | ||
} | ||
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imageIndexDigest, err := imageIndex.Digest() | ||
if err != nil { | ||
return nil, err | ||
} | ||
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artefactInfo.RawManifests.Index = rawManifest[oci.IndexManifest]{ | ||
Digest: imageIndexDigest.String(), | ||
Manifest: indexManifest, | ||
} | ||
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imageInfo, manifests, err := client.FetchFromIndexOrImage(ctx, imageIndex, indexManifest, nil) | ||
if err != nil { | ||
return nil, err | ||
} | ||
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if len(imageInfo) == 0 { | ||
return nil, fmt.Errorf("no images found in index %q", c.Image) | ||
} | ||
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for i := range imageInfo { | ||
info := imageInfo[i] | ||
switch info.MediaType { | ||
case oci.ContentMediaType: | ||
case oci.AttestMediaType: | ||
gr, err := gzip.NewReader(info) | ||
if err != nil { | ||
return nil, err | ||
} | ||
scanner := bufio.NewScanner(gr) | ||
for scanner.Scan() { | ||
statement := toto.Statement{} // attestTypes.GenericStatement[any]{} | ||
if err := json.NewDecoder(bytes.NewBuffer(scanner.Bytes())).Decode(&statement); err != nil { | ||
return nil, err | ||
} | ||
artefactInfo.Attestations = append(artefactInfo.Attestations, statement) | ||
} | ||
if err := scanner.Err(); err != nil { | ||
return nil, err | ||
} | ||
if err := gr.Close(); err != nil { | ||
return nil, err | ||
} | ||
} | ||
} | ||
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for digest := range manifests { | ||
m := rawManifest[oci.Manifest]{ | ||
Digest: digest.String(), | ||
Manifest: manifests[digest], | ||
} | ||
switch m.Manifest.Config.MediaType { | ||
case oci.ContentMediaType: | ||
artefactInfo.RawManifests.Content = m | ||
case oci.AttestMediaType: | ||
artefactInfo.RawManifests.Attest = m | ||
} | ||
} | ||
return artefactInfo, nil | ||
} | ||
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func (c *TapeViewCommand) PrintInfo(ctx context.Context, outputInfo *artefactInfo) error { | ||
stdj := json.NewEncoder(os.Stdout) | ||
switch c.OutputFormat { | ||
case OutputFormatDirectJSON: | ||
stdj.SetIndent("", " ") | ||
if err := stdj.Encode(outputInfo); err != nil { | ||
return fmt.Errorf("failed to marshal output: %w", err) | ||
} | ||
case OutputFormatText, OutputFormatDetailedText: | ||
fmt.Printf("%s\n", c.Image) | ||
fmt.Printf(" Digest: %s\n", outputInfo.RawManifests.Index.Digest) | ||
fmt.Printf(" OCI Manifests:\n") | ||
fmt.Printf(" %s %s %d \n", outputInfo.RawManifests.Content.Digest, | ||
outputInfo.RawManifests.Content.Manifest.Config.MediaType, | ||
outputInfo.RawManifests.Content.Manifest.Config.Size) | ||
fmt.Printf(" %s\n", outputInfo.RawManifests.Attest.Digest) | ||
|
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} | ||
return nil | ||
} |