|
| 1 | +package main |
| 2 | + |
| 3 | +import ( |
| 4 | + "context" |
| 5 | + "fmt" |
| 6 | + "os" |
| 7 | + |
| 8 | + "github.com/containers/image/v5/docker" |
| 9 | + "github.com/containers/image/v5/docker/reference" |
| 10 | + "github.com/containers/image/v5/manifest" |
| 11 | + "github.com/containers/image/v5/types" |
| 12 | +) |
| 13 | + |
| 14 | +// This is a simple tool to resolve canonical reference of the image. |
| 15 | +// E.g. this resolves quay.io/operator-framework/olm:v0.28.0 to |
| 16 | +// quay.io/operator-framework/olm@sha256:40d0363f4aa684319cd721c2fcf3321785380fdc74de8ef821317cd25a10782a |
| 17 | +func main() { |
| 18 | + ctx := context.Background() |
| 19 | + |
| 20 | + if len(os.Args) != 2 { |
| 21 | + fmt.Fprintf(os.Stderr, "usage: %s <image reference>\n", os.Args[0]) |
| 22 | + os.Exit(1) |
| 23 | + } |
| 24 | + |
| 25 | + ref := os.Args[1] |
| 26 | + |
| 27 | + if err := run(ctx, ref); err != nil { |
| 28 | + fmt.Fprintf(os.Stderr, "error running the tool: %s\n", err) |
| 29 | + os.Exit(1) |
| 30 | + } |
| 31 | +} |
| 32 | + |
| 33 | +func run(ctx context.Context, ref string) error { |
| 34 | + imgRef, err := reference.ParseNamed(ref) |
| 35 | + if err != nil { |
| 36 | + return fmt.Errorf("error parsing image reference %q: %w", ref, err) |
| 37 | + } |
| 38 | + |
| 39 | + sysCtx := &types.SystemContext{} |
| 40 | + canonicalRef, err := resolveCanonicalRef(ctx, imgRef, sysCtx) |
| 41 | + if err != nil { |
| 42 | + return fmt.Errorf("error resolving canonical reference: %w", err) |
| 43 | + } |
| 44 | + |
| 45 | + fmt.Println(canonicalRef.String()) |
| 46 | + return nil |
| 47 | +} |
| 48 | + |
| 49 | +func resolveCanonicalRef(ctx context.Context, imgRef reference.Named, sysCtx *types.SystemContext) (reference.Canonical, error) { |
| 50 | + if canonicalRef, ok := imgRef.(reference.Canonical); ok { |
| 51 | + return canonicalRef, nil |
| 52 | + } |
| 53 | + |
| 54 | + srcRef, err := docker.NewReference(imgRef) |
| 55 | + if err != nil { |
| 56 | + return nil, fmt.Errorf("error creating reference: %w", err) |
| 57 | + } |
| 58 | + |
| 59 | + imgSrc, err := srcRef.NewImageSource(ctx, sysCtx) |
| 60 | + if err != nil { |
| 61 | + return nil, fmt.Errorf("error creating image source: %w", err) |
| 62 | + } |
| 63 | + defer imgSrc.Close() |
| 64 | + |
| 65 | + imgManifestData, _, err := imgSrc.GetManifest(ctx, nil) |
| 66 | + if err != nil { |
| 67 | + return nil, fmt.Errorf("error getting manifest: %w", err) |
| 68 | + } |
| 69 | + imgDigest, err := manifest.Digest(imgManifestData) |
| 70 | + if err != nil { |
| 71 | + return nil, fmt.Errorf("error getting digest of manifest: %w", err) |
| 72 | + } |
| 73 | + canonicalRef, err := reference.WithDigest(reference.TrimNamed(imgRef), imgDigest) |
| 74 | + if err != nil { |
| 75 | + return nil, fmt.Errorf("error creating canonical reference: %w", err) |
| 76 | + } |
| 77 | + return canonicalRef, nil |
| 78 | +} |
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