File: utils.go

package info (click to toggle)
singularity-container 4.1.5%2Bds4-1
  • links: PTS, VCS
  • area: main
  • in suites: sid
  • size: 43,876 kB
  • sloc: asm: 14,840; sh: 3,190; ansic: 1,751; awk: 414; makefile: 413; python: 99
file content (374 lines) | stat: -rw-r--r-- 8,407 bytes parent folder | download
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
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
package cacheimport

import (
	"context"
	"fmt"
	"sort"

	"github.com/moby/buildkit/solver"
	"github.com/moby/buildkit/util/bklog"
	digest "github.com/opencontainers/go-digest"
	"github.com/pkg/errors"
)

// sortConfig sorts the config structure to make sure it is deterministic
func sortConfig(cc *CacheConfig) {
	type indexedLayer struct {
		oldIndex int
		newIndex int
		l        CacheLayer
	}

	unsortedLayers := make([]*indexedLayer, len(cc.Layers))
	sortedLayers := make([]*indexedLayer, len(cc.Layers))

	for i, l := range cc.Layers {
		il := &indexedLayer{oldIndex: i, l: l}
		unsortedLayers[i] = il
		sortedLayers[i] = il
	}
	sort.Slice(sortedLayers, func(i, j int) bool {
		li := sortedLayers[i].l
		lj := sortedLayers[j].l
		if li.Blob == lj.Blob {
			return li.ParentIndex < lj.ParentIndex
		}
		return li.Blob < lj.Blob
	})
	for i, l := range sortedLayers {
		l.newIndex = i
	}

	layers := make([]CacheLayer, len(sortedLayers))
	for i, l := range sortedLayers {
		if pID := l.l.ParentIndex; pID != -1 {
			l.l.ParentIndex = unsortedLayers[pID].newIndex
		}
		layers[i] = l.l
	}

	type indexedRecord struct {
		oldIndex int
		newIndex int
		r        CacheRecord
	}

	unsortedRecords := make([]*indexedRecord, len(cc.Records))
	sortedRecords := make([]*indexedRecord, len(cc.Records))

	for i, r := range cc.Records {
		ir := &indexedRecord{oldIndex: i, r: r}
		unsortedRecords[i] = ir
		sortedRecords[i] = ir
	}
	sort.Slice(sortedRecords, func(i, j int) bool {
		ri := sortedRecords[i].r
		rj := sortedRecords[j].r
		if ri.Digest != rj.Digest {
			return ri.Digest < rj.Digest
		}
		if len(ri.Inputs) != len(rj.Inputs) {
			return len(ri.Inputs) < len(rj.Inputs)
		}
		for i, inputs := range ri.Inputs {
			if len(ri.Inputs[i]) != len(rj.Inputs[i]) {
				return len(ri.Inputs[i]) < len(rj.Inputs[i])
			}
			for j := range inputs {
				if ri.Inputs[i][j].Selector != rj.Inputs[i][j].Selector {
					return ri.Inputs[i][j].Selector < rj.Inputs[i][j].Selector
				}
				inputDigesti := cc.Records[ri.Inputs[i][j].LinkIndex].Digest
				inputDigestj := cc.Records[rj.Inputs[i][j].LinkIndex].Digest
				if inputDigesti != inputDigestj {
					return inputDigesti < inputDigestj
				}
			}
		}
		return false
	})
	for i, l := range sortedRecords {
		l.newIndex = i
	}

	records := make([]CacheRecord, len(sortedRecords))
	for i, r := range sortedRecords {
		for j := range r.r.Results {
			r.r.Results[j].LayerIndex = unsortedLayers[r.r.Results[j].LayerIndex].newIndex
		}
		for j, inputs := range r.r.Inputs {
			for k := range inputs {
				r.r.Inputs[j][k].LinkIndex = unsortedRecords[r.r.Inputs[j][k].LinkIndex].newIndex
			}
			sort.Slice(inputs, func(i, j int) bool {
				return inputs[i].LinkIndex < inputs[j].LinkIndex
			})
		}
		records[i] = r.r
	}

	cc.Layers = layers
	cc.Records = records
}

func outputKey(dgst digest.Digest, idx int) digest.Digest {
	return digest.FromBytes([]byte(fmt.Sprintf("%s@%d", dgst, idx)))
}

type nlink struct {
	dgst     digest.Digest
	input    int
	selector string
}
type normalizeState struct {
	added map[*item]*item
	links map[*item]map[nlink]map[digest.Digest]struct{}
	byKey map[digest.Digest]*item
	next  int
}

func (s *normalizeState) removeLoops(ctx context.Context) {
	roots := []digest.Digest{}
	for dgst, it := range s.byKey {
		if len(it.links) == 0 {
			roots = append(roots, dgst)
		}
	}

	visited := map[digest.Digest]struct{}{}

	for _, d := range roots {
		s.checkLoops(ctx, d, visited)
	}
}

func (s *normalizeState) checkLoops(ctx context.Context, d digest.Digest, visited map[digest.Digest]struct{}) {
	it, ok := s.byKey[d]
	if !ok {
		return
	}
	links, ok := s.links[it]
	if !ok {
		return
	}
	visited[d] = struct{}{}
	defer func() {
		delete(visited, d)
	}()

	for l, ids := range links {
		for id := range ids {
			if _, ok := visited[id]; ok {
				it2, ok := s.byKey[id]
				if !ok {
					continue
				}
				if !it2.removeLink(it) {
					bklog.G(ctx).Warnf("failed to remove looping cache key %s %s", d, id)
				}
				delete(links[l], id)
			} else {
				s.checkLoops(ctx, id, visited)
			}
		}
	}
}

func normalizeItem(it *item, state *normalizeState) (*item, error) {
	if it2, ok := state.added[it]; ok {
		return it2, nil
	}

	if len(it.links) == 0 {
		id := it.dgst
		if it2, ok := state.byKey[id]; ok {
			state.added[it] = it2
			return it2, nil
		}
		state.byKey[id] = it
		state.added[it] = it
		return nil, nil
	}

	matches := map[digest.Digest]struct{}{}

	// check if there is already a matching record
	for i, m := range it.links {
		if len(m) == 0 {
			return nil, errors.Errorf("invalid incomplete links")
		}
		for l := range m {
			nl := nlink{dgst: it.dgst, input: i, selector: l.selector}
			it2, err := normalizeItem(l.src, state)
			if err != nil {
				return nil, err
			}
			links := state.links[it2][nl]
			if i == 0 {
				for id := range links {
					matches[id] = struct{}{}
				}
			} else {
				for id := range matches {
					if _, ok := links[id]; !ok {
						delete(matches, id)
					}
				}
			}
		}
	}

	var id digest.Digest

	links := it.links

	if len(matches) > 0 {
		for m := range matches {
			if id == "" || id > m {
				id = m
			}
		}
	} else {
		// keep tmp IDs deterministic
		state.next++
		id = digest.FromBytes([]byte(fmt.Sprintf("%d", state.next)))
		state.byKey[id] = it
		it.links = make([]map[link]struct{}, len(it.links))
		for i := range it.links {
			it.links[i] = map[link]struct{}{}
		}
	}

	it2 := state.byKey[id]
	state.added[it] = it2

	for i, m := range links {
		for l := range m {
			subIt, err := normalizeItem(l.src, state)
			if err != nil {
				return nil, err
			}
			it2.links[i][link{src: subIt, selector: l.selector}] = struct{}{}

			nl := nlink{dgst: it.dgst, input: i, selector: l.selector}
			if _, ok := state.links[subIt]; !ok {
				state.links[subIt] = map[nlink]map[digest.Digest]struct{}{}
			}
			if _, ok := state.links[subIt][nl]; !ok {
				state.links[subIt][nl] = map[digest.Digest]struct{}{}
			}
			state.links[subIt][nl][id] = struct{}{}
		}
	}

	return it2, nil
}

type marshalState struct {
	layers      []CacheLayer
	chainsByID  map[string]int
	descriptors DescriptorProvider

	records       []CacheRecord
	recordsByItem map[*item]int
}

func marshalRemote(ctx context.Context, r *solver.Remote, state *marshalState) string {
	if len(r.Descriptors) == 0 {
		return ""
	}

	if r.Provider != nil {
		for _, d := range r.Descriptors {
			if _, err := r.Provider.Info(ctx, d.Digest); err != nil {
				return ""
			}
		}
	}

	var parentID string
	if len(r.Descriptors) > 1 {
		r2 := &solver.Remote{
			Descriptors: r.Descriptors[:len(r.Descriptors)-1],
			Provider:    r.Provider,
		}
		parentID = marshalRemote(ctx, r2, state)
	}
	desc := r.Descriptors[len(r.Descriptors)-1]

	state.descriptors[desc.Digest] = DescriptorProviderPair{
		Descriptor: desc,
		Provider:   r.Provider,
	}

	id := desc.Digest.String() + parentID

	if _, ok := state.chainsByID[id]; ok {
		return id
	}

	state.chainsByID[id] = len(state.layers)
	l := CacheLayer{
		Blob:        desc.Digest,
		ParentIndex: -1,
	}
	if parentID != "" {
		l.ParentIndex = state.chainsByID[parentID]
	}
	state.layers = append(state.layers, l)
	return id
}

func marshalItem(ctx context.Context, it *item, state *marshalState) error {
	if _, ok := state.recordsByItem[it]; ok {
		return nil
	}

	rec := CacheRecord{
		Digest: it.dgst,
		Inputs: make([][]CacheInput, len(it.links)),
	}

	for i, m := range it.links {
		for l := range m {
			if err := marshalItem(ctx, l.src, state); err != nil {
				return err
			}
			idx, ok := state.recordsByItem[l.src]
			if !ok {
				return errors.Errorf("invalid source record: %v", l.src)
			}
			rec.Inputs[i] = append(rec.Inputs[i], CacheInput{
				Selector:  l.selector,
				LinkIndex: idx,
			})
		}
	}

	if it.result != nil {
		id := marshalRemote(ctx, it.result, state)
		if id != "" {
			idx, ok := state.chainsByID[id]
			if !ok {
				return errors.Errorf("parent chainid not found")
			}
			rec.Results = append(rec.Results, CacheResult{LayerIndex: idx, CreatedAt: it.resultTime})
		}
	}

	state.recordsByItem[it] = len(state.records)
	state.records = append(state.records, rec)
	return nil
}

func isSubRemote(sub, main solver.Remote) bool {
	if len(sub.Descriptors) > len(main.Descriptors) {
		return false
	}
	for i := range sub.Descriptors {
		if sub.Descriptors[i].Digest != main.Descriptors[i].Digest {
			return false
		}
	}
	return true
}