Apply applies the content associated with the provided digests onto the provided mounts. Archive content will be extracted and decompressed if necessary.
(ctx context.Context, desc ocispec.Descriptor, mounts []mount.Mount, opts ...diff.ApplyOpt)
| 60 | // provided mounts. Archive content will be extracted and decompressed if |
| 61 | // necessary. |
| 62 | func (s *fsApplier) Apply(ctx context.Context, desc ocispec.Descriptor, mounts []mount.Mount, opts ...diff.ApplyOpt) (d ocispec.Descriptor, err error) { |
| 63 | t1 := time.Now() |
| 64 | defer func() { |
| 65 | if err == nil { |
| 66 | log.G(ctx).WithFields(log.Fields{ |
| 67 | "d": time.Since(t1), |
| 68 | "digest": desc.Digest, |
| 69 | "size": desc.Size, |
| 70 | "media": desc.MediaType, |
| 71 | }).Debugf("diff applied") |
| 72 | } |
| 73 | }() |
| 74 | |
| 75 | var config diff.ApplyConfig |
| 76 | for _, o := range opts { |
| 77 | if err := o(ctx, desc, &config); err != nil { |
| 78 | return emptyDesc, fmt.Errorf("failed to apply config opt: %w", err) |
| 79 | } |
| 80 | } |
| 81 | |
| 82 | ra, err := s.store.ReaderAt(ctx, desc) |
| 83 | if err != nil { |
| 84 | return emptyDesc, fmt.Errorf("failed to get reader from content store: %w", err) |
| 85 | } |
| 86 | var r io.ReadCloser |
| 87 | if config.Progress != nil { |
| 88 | r = newProgressReader(ra, config.Progress) |
| 89 | } else { |
| 90 | r = newReadCloser(ra) |
| 91 | } |
| 92 | defer r.Close() |
| 93 | |
| 94 | var processors []diff.StreamProcessor |
| 95 | processor := diff.NewProcessorChain(desc.MediaType, r) |
| 96 | processors = append(processors, processor) |
| 97 | for { |
| 98 | if processor, err = diff.GetProcessor(ctx, processor, config.ProcessorPayloads); err != nil { |
| 99 | return emptyDesc, fmt.Errorf("failed to get stream processor for %s: %w", desc.MediaType, err) |
| 100 | } |
| 101 | processors = append(processors, processor) |
| 102 | if processor.MediaType() == ocispec.MediaTypeImageLayer { |
| 103 | break |
| 104 | } |
| 105 | } |
| 106 | defer processor.Close() |
| 107 | |
| 108 | digester := digest.Canonical.Digester() |
| 109 | rc := &readCounter{ |
| 110 | r: io.TeeReader(processor, digester.Hash()), |
| 111 | } |
| 112 | |
| 113 | // The number of `mounts` that need to be parsed by the mount manager |
| 114 | // will be more than 1 in reality; this is needed to work around some |
| 115 | // overlayfs/bind shortcuts in core/diff/apply/apply_linux.go |
| 116 | if s.mount != nil && len(mounts) > 1 { |
| 117 | var b [3]byte |
| 118 | // Ignore read failures, just decreases uniqueness |
| 119 | rand.Read(b[:]) |
nothing calls this directly
no test coverage detected