1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
|
package cacheimport
// Distributable build cache
//
// Main manifest is OCI image index
// https://github.com/opencontainers/image-spec/blob/master/image-index.md .
// Manifests array contains descriptors to the cache layers and one instance of
// build cache config with media type application/vnd.buildkit.cacheconfig.v0 .
// The cache layer descriptors need to have an annotation with uncompressed digest
// to allow deduplication on extraction and optionally "buildkit/createdat"
// annotation to support maintaining original timestamps.
//
// Cache config file layout:
//
//{
// "layers": [ <- layers contains references to blobs
// {
// "blob": "sha256:deadbeef", <- digest of layer blob in index
// "parent": -1 <- index of parent layer, -1 if no parent
// },
// {
// "blob": "sha256:deadbeef",
// "parent": 0
// }
// ],
//
// "records": [ <- records contains chains of cache keys
// {
// "digest": "sha256:deadbeef", <- base digest for the record
// },
// {
// "digest": "sha256:deadbeef",
// "layers": [ <- optional array of layer pointers
// {
// "createdat": "",
// "layer": 1, <- index to the layers array, layer is loaded with all of its parents
// }
// ],
// "chains": [ <- optional array of layer pointer lists
// {
// "createdat": "",
// "layers": [1], <- indexes to the layers array, all layers are loaded in specified order without parents
// }
// ],
// "inputs": [ <- dependant records, this is how cache keys are linked together
// [ <- index of the dependency (0)
// {
// "selector": "sel", <- optional selector
// "link": 0, <- index to the dependant record
// }
// ]
// ]
// }
// ]
// }
|
