Source file
src/go/build/deps_test.go
1
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4
5
6
7
8 package build
9
10 import (
11 "bytes"
12 "fmt"
13 "go/token"
14 "internal/dag"
15 "internal/testenv"
16 "io/fs"
17 "os"
18 "path/filepath"
19 "slices"
20 "strings"
21 "testing"
22 )
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38 var depsRules = `
39 # No dependencies allowed for any of these packages.
40 NONE
41 < unsafe
42 < cmp,
43 container/list,
44 container/ring,
45 internal/byteorder,
46 internal/cfg,
47 internal/coverage,
48 internal/coverage/rtcov,
49 internal/coverage/uleb128,
50 internal/coverage/calloc,
51 internal/cpu,
52 internal/goarch,
53 internal/godebugs,
54 internal/goexperiment,
55 internal/goos,
56 internal/goversion,
57 internal/nettrace,
58 internal/platform,
59 internal/profilerecord,
60 internal/syslist,
61 internal/trace/tracev2,
62 internal/trace/traceviewer/format,
63 log/internal,
64 math/bits,
65 structs,
66 unicode,
67 unicode/utf8,
68 unicode/utf16;
69
70 internal/goarch < internal/abi;
71 internal/byteorder, internal/cpu, internal/goarch < internal/chacha8rand;
72
73 # RUNTIME is the core runtime group of packages, all of them very light-weight.
74 internal/abi,
75 internal/chacha8rand,
76 internal/coverage/rtcov,
77 internal/cpu,
78 internal/goarch,
79 internal/godebugs,
80 internal/goexperiment,
81 internal/goos,
82 internal/profilerecord,
83 internal/trace/tracev2,
84 math/bits,
85 structs
86 < internal/bytealg
87 < internal/stringslite
88 < internal/itoa
89 < internal/unsafeheader
90 < internal/race
91 < internal/msan
92 < internal/asan
93 < internal/runtime/sys
94 < internal/runtime/syscall
95 < internal/runtime/atomic
96 < internal/runtime/exithook
97 < internal/runtime/math
98 < internal/runtime/maps
99 < runtime
100 < sync/atomic
101 < internal/sync
102 < weak
103 < sync
104 < internal/bisect
105 < internal/godebug
106 < internal/reflectlite
107 < errors
108 < internal/oserror;
109
110 cmp, runtime, math/bits
111 < iter
112 < maps, slices;
113
114 internal/oserror, maps, slices
115 < RUNTIME;
116
117 RUNTIME
118 < sort
119 < container/heap
120 < unique;
121
122 RUNTIME
123 < io;
124
125 RUNTIME
126 < arena;
127
128 syscall !< io;
129 reflect !< sort;
130
131 RUNTIME, unicode/utf8
132 < path;
133
134 unicode !< path;
135
136 RUNTIME
137 < internal/synctest
138 < testing/synctest;
139
140 # SYSCALL is RUNTIME plus the packages necessary for basic system calls.
141 RUNTIME, unicode/utf8, unicode/utf16, internal/synctest
142 < internal/syscall/windows/sysdll, syscall/js
143 < syscall
144 < internal/syscall/unix, internal/syscall/windows, internal/syscall/windows/registry
145 < internal/syscall/execenv
146 < SYSCALL;
147
148 # TIME is SYSCALL plus the core packages about time, including context.
149 SYSCALL
150 < time/tzdata
151 < time
152 < context
153 < TIME;
154
155 TIME, io, path, slices
156 < io/fs;
157
158 # MATH is RUNTIME plus the basic math packages.
159 RUNTIME
160 < math
161 < MATH;
162
163 unicode !< math;
164
165 MATH
166 < math/cmplx;
167
168 MATH
169 < math/rand, math/rand/v2;
170
171 MATH
172 < runtime/metrics;
173
174 MATH, unicode/utf8
175 < strconv;
176
177 unicode !< strconv;
178
179 # STR is basic string and buffer manipulation.
180 RUNTIME, io, unicode/utf8, unicode/utf16, unicode
181 < bytes, strings
182 < bufio;
183
184 bufio, path, strconv
185 < STR;
186
187 # OS is basic OS access, including helpers (path/filepath, os/exec, etc).
188 # OS includes string routines, but those must be layered above package os.
189 # OS does not include reflection.
190 io/fs
191 < internal/testlog
192 < internal/poll
193 < internal/filepathlite
194 < os
195 < os/signal;
196
197 io/fs
198 < embed;
199
200 unicode, fmt !< net, os, os/signal;
201
202 os/signal, internal/filepathlite, STR
203 < path/filepath
204 < io/ioutil;
205
206 path/filepath, internal/godebug < os/exec;
207
208 io/ioutil, os/exec, os/signal
209 < OS;
210
211 reflect !< OS;
212
213 OS
214 < golang.org/x/sys/cpu;
215
216 # FMT is OS (which includes string routines) plus reflect and fmt.
217 # It does not include package log, which should be avoided in core packages.
218 arena, strconv, unicode
219 < reflect;
220
221 os, reflect
222 < internal/fmtsort
223 < fmt;
224
225 OS, fmt
226 < FMT;
227
228 log !< FMT;
229
230 # Misc packages needing only FMT.
231 FMT
232 < html,
233 internal/dag,
234 internal/goroot,
235 internal/types/errors,
236 mime/quotedprintable,
237 net/internal/socktest,
238 net/url,
239 runtime/trace,
240 text/scanner,
241 text/tabwriter;
242
243 io, reflect
244 < internal/saferio;
245
246 # encodings
247 # core ones do not use fmt.
248 io, strconv, slices
249 < encoding, encoding/base32, encoding/base64;
250
251 encoding, reflect
252 < encoding/binary;
253
254 FMT, encoding < flag;
255
256 fmt !< encoding/base32, encoding/base64;
257
258 FMT, encoding, encoding/base32, encoding/base64, encoding/binary,
259 internal/saferio
260 < encoding/ascii85, encoding/csv, encoding/gob, encoding/hex,
261 encoding/pem, encoding/xml, mime;
262
263 STR, errors
264 < encoding/json/internal
265 < encoding/json/internal/jsonflags
266 < encoding/json/internal/jsonopts
267 < encoding/json/internal/jsonwire
268 < encoding/json/jsontext;
269
270 FMT,
271 encoding/hex,
272 encoding/base32,
273 encoding/base64,
274 encoding/binary,
275 encoding/json/jsontext,
276 encoding/json/internal,
277 encoding/json/internal/jsonflags,
278 encoding/json/internal/jsonopts,
279 encoding/json/internal/jsonwire
280 < encoding/json/v2
281 < encoding/json;
282
283 # hashes
284 io
285 < hash
286 < hash/adler32, hash/crc32, hash/crc64, hash/fnv;
287
288 # math/big
289 FMT, math/rand
290 < math/big;
291
292 # compression
293 FMT, encoding/binary, hash/adler32, hash/crc32, sort
294 < compress/bzip2, compress/flate, compress/lzw, internal/zstd
295 < archive/zip, compress/gzip, compress/zlib;
296
297 # templates
298 FMT
299 < text/template/parse;
300
301 net/url, text/template/parse
302 < text/template
303 < internal/lazytemplate;
304
305 # regexp
306 FMT, sort
307 < regexp/syntax
308 < regexp
309 < internal/lazyregexp;
310
311 encoding/json, html, text/template, regexp
312 < html/template;
313
314 # suffix array
315 encoding/binary, regexp
316 < index/suffixarray;
317
318 # executable parsing
319 FMT, encoding/binary, compress/zlib, internal/saferio, internal/zstd, sort
320 < runtime/debug
321 < debug/dwarf
322 < debug/elf, debug/gosym, debug/macho, debug/pe, debug/plan9obj, internal/xcoff
323 < debug/buildinfo
324 < DEBUG;
325
326 # go parser and friends.
327 FMT, sort
328 < internal/gover
329 < go/version
330 < go/token
331 < go/scanner
332 < go/ast
333 < go/internal/typeparams;
334
335 FMT
336 < go/build/constraint;
337
338 FMT, sort
339 < go/doc/comment;
340
341 go/internal/typeparams, go/build/constraint
342 < go/parser;
343
344 go/doc/comment, go/parser, text/tabwriter
345 < go/printer
346 < go/format;
347
348 math/big, go/token
349 < go/constant;
350
351 FMT, internal/goexperiment
352 < internal/buildcfg;
353
354 container/heap, go/constant, go/parser, internal/buildcfg, internal/goversion, internal/types/errors
355 < go/types;
356
357 # The vast majority of standard library packages should not be resorting to regexp.
358 # go/types is a good chokepoint. It shouldn't use regexp, nor should anything
359 # that is low-enough level to be used by go/types.
360 regexp !< go/types;
361
362 go/doc/comment, go/parser, internal/lazyregexp, text/template
363 < go/doc;
364
365 go/build/constraint, go/doc, go/parser, internal/buildcfg, internal/goroot, internal/goversion, internal/platform, internal/syslist
366 < go/build;
367
368 # databases
369 FMT
370 < database/sql/internal
371 < database/sql/driver;
372
373 database/sql/driver, math/rand/v2 < database/sql;
374
375 # images
376 FMT, compress/lzw, compress/zlib
377 < image/color
378 < image, image/color/palette
379 < image/internal/imageutil
380 < image/draw
381 < image/gif, image/jpeg, image/png;
382
383 # cgo, delayed as long as possible.
384 # If you add a dependency on CGO, you must add the package
385 # to cgoPackages in cmd/dist/test.go as well.
386 RUNTIME
387 < C
388 < runtime/cgo
389 < CGO
390 < runtime/msan, runtime/asan;
391
392 # runtime/race
393 NONE < runtime/race/internal/amd64v1;
394 NONE < runtime/race/internal/amd64v3;
395 CGO, runtime/race/internal/amd64v1, runtime/race/internal/amd64v3 < runtime/race;
396
397 # Bulk of the standard library must not use cgo.
398 # The prohibition stops at net and os/user.
399 C !< fmt, go/types, CRYPTO-MATH, log/slog;
400
401 CGO, OS
402 < plugin;
403
404 CGO, FMT
405 < os/user
406 < archive/tar;
407
408 sync
409 < internal/singleflight;
410
411 os
412 < golang.org/x/net/dns/dnsmessage,
413 golang.org/x/net/lif;
414
415 internal/bytealg, internal/itoa, math/bits, slices, strconv, unique
416 < net/netip;
417
418 os, net/netip
419 < internal/routebsd;
420
421 # net is unavoidable when doing any networking,
422 # so large dependencies must be kept out.
423 # This is a long-looking list but most of these
424 # are small with few dependencies.
425 CGO,
426 golang.org/x/net/dns/dnsmessage,
427 golang.org/x/net/lif,
428 internal/godebug,
429 internal/nettrace,
430 internal/poll,
431 internal/routebsd,
432 internal/singleflight,
433 net/netip,
434 os,
435 sort
436 < net;
437
438 fmt, unicode !< net;
439 math/rand !< net; # net uses runtime instead
440
441 # NET is net plus net-helper packages.
442 FMT, net
443 < net/textproto;
444
445 mime, net/textproto, net/url
446 < NET;
447
448 # logging - most packages should not import; http and up is allowed
449 FMT, log/internal
450 < log;
451
452 log, log/slog !< crypto/tls, database/sql, go/importer, testing;
453
454 FMT, log, net
455 < log/syslog;
456
457 RUNTIME
458 < log/slog/internal, log/slog/internal/buffer;
459
460 FMT,
461 encoding, encoding/json,
462 log, log/internal,
463 log/slog/internal, log/slog/internal/buffer,
464 slices
465 < log/slog
466 < log/slog/internal/slogtest, log/slog/internal/benchmarks;
467
468 NET, log
469 < net/mail;
470
471 # FIPS is the FIPS 140 module.
472 # It must not depend on external crypto packages.
473 # See also fips140deps.AllowedInternalPackages.
474
475 io, math/rand/v2 < crypto/internal/randutil;
476
477 STR < crypto/internal/impl;
478
479 OS < crypto/internal/sysrand
480 < crypto/internal/entropy;
481
482 internal/byteorder < crypto/internal/fips140deps/byteorder;
483 internal/cpu, internal/goarch < crypto/internal/fips140deps/cpu;
484 internal/godebug < crypto/internal/fips140deps/godebug;
485
486 STR, crypto/internal/impl,
487 crypto/internal/entropy,
488 crypto/internal/randutil,
489 crypto/internal/fips140deps/byteorder,
490 crypto/internal/fips140deps/cpu,
491 crypto/internal/fips140deps/godebug
492 < crypto/internal/fips140
493 < crypto/internal/fips140/alias
494 < crypto/internal/fips140/subtle
495 < crypto/internal/fips140/sha256
496 < crypto/internal/fips140/sha512
497 < crypto/internal/fips140/sha3
498 < crypto/internal/fips140/hmac
499 < crypto/internal/fips140/check
500 < crypto/internal/fips140/pbkdf2
501 < crypto/internal/fips140/aes
502 < crypto/internal/fips140/drbg
503 < crypto/internal/fips140/aes/gcm
504 < crypto/internal/fips140/hkdf
505 < crypto/internal/fips140/mlkem
506 < crypto/internal/fips140/ssh
507 < crypto/internal/fips140/tls12
508 < crypto/internal/fips140/tls13
509 < crypto/internal/fips140/bigmod
510 < crypto/internal/fips140/nistec/fiat
511 < crypto/internal/fips140/nistec
512 < crypto/internal/fips140/ecdh
513 < crypto/internal/fips140/ecdsa
514 < crypto/internal/fips140/edwards25519/field
515 < crypto/internal/fips140/edwards25519
516 < crypto/internal/fips140/ed25519
517 < crypto/internal/fips140/rsa
518 < FIPS;
519
520 FIPS, internal/godebug < crypto/fips140;
521
522 crypto, hash !< FIPS;
523
524 # CRYPTO is core crypto algorithms - no cgo, fmt, net.
525 # Mostly wrappers around the FIPS module.
526
527 NONE < crypto/internal/boring/sig, crypto/internal/boring/syso;
528 sync/atomic < crypto/internal/boring/bcache;
529
530 FIPS, internal/godebug, hash, embed,
531 crypto/internal/boring/sig,
532 crypto/internal/boring/syso,
533 crypto/internal/boring/bcache
534 < crypto/internal/fips140only
535 < crypto
536 < crypto/subtle
537 < crypto/sha3
538 < crypto/internal/fips140hash
539 < crypto/cipher
540 < crypto/internal/boring
541 < crypto/boring
542 < crypto/aes,
543 crypto/des,
544 crypto/rc4,
545 crypto/md5,
546 crypto/sha1,
547 crypto/sha256,
548 crypto/sha512,
549 crypto/hmac,
550 crypto/hkdf,
551 crypto/pbkdf2,
552 crypto/ecdh,
553 crypto/mlkem
554 < CRYPTO;
555
556 CGO, fmt, net !< CRYPTO;
557
558 # CRYPTO-MATH is crypto that exposes math/big APIs - no cgo, net; fmt now ok.
559
560 CRYPTO, FMT, math/big
561 < crypto/internal/boring/bbig
562 < crypto/rand
563 < crypto/ed25519 # depends on crypto/rand.Reader
564 < encoding/asn1
565 < golang.org/x/crypto/cryptobyte/asn1
566 < golang.org/x/crypto/cryptobyte
567 < crypto/dsa, crypto/elliptic, crypto/rsa
568 < crypto/ecdsa
569 < CRYPTO-MATH;
570
571 CGO, net !< CRYPTO-MATH;
572
573 # TLS, Prince of Dependencies.
574
575 crypto/fips140, sync/atomic < crypto/tls/internal/fips140tls;
576
577 crypto/internal/boring/sig, crypto/tls/internal/fips140tls < crypto/tls/fipsonly;
578
579 CRYPTO, golang.org/x/sys/cpu, encoding/binary, reflect
580 < golang.org/x/crypto/internal/alias
581 < golang.org/x/crypto/internal/subtle
582 < golang.org/x/crypto/chacha20
583 < golang.org/x/crypto/internal/poly1305
584 < golang.org/x/crypto/chacha20poly1305;
585
586 CRYPTO-MATH, NET, container/list, encoding/hex, encoding/pem,
587 golang.org/x/crypto/chacha20poly1305, crypto/tls/internal/fips140tls
588 < crypto/internal/hpke
589 < crypto/x509/internal/macos
590 < crypto/x509/pkix
591 < crypto/x509
592 < crypto/tls;
593
594 # crypto-aware packages
595
596 DEBUG, go/build, go/types, text/scanner, crypto/sha256
597 < internal/pkgbits, internal/exportdata
598 < go/internal/gcimporter, go/internal/gccgoimporter, go/internal/srcimporter
599 < go/importer;
600
601 NET, crypto/rand, mime/quotedprintable
602 < mime/multipart;
603
604 crypto/tls
605 < net/smtp;
606
607 crypto/rand
608 < hash/maphash; # for purego implementation
609
610 # HTTP, King of Dependencies.
611
612 FMT
613 < golang.org/x/net/http2/hpack
614 < net/http/internal, net/http/internal/ascii, net/http/internal/testcert;
615
616 FMT, NET, container/list, encoding/binary, log
617 < golang.org/x/text/transform
618 < golang.org/x/text/unicode/norm
619 < golang.org/x/text/unicode/bidi
620 < golang.org/x/text/secure/bidirule
621 < golang.org/x/net/idna
622 < golang.org/x/net/http/httpguts, golang.org/x/net/http/httpproxy;
623
624 NET, crypto/tls
625 < net/http/httptrace;
626
627 compress/gzip,
628 golang.org/x/net/http/httpguts,
629 golang.org/x/net/http/httpproxy,
630 golang.org/x/net/http2/hpack,
631 net/http/internal,
632 net/http/internal/ascii,
633 net/http/internal/testcert,
634 net/http/httptrace,
635 mime/multipart,
636 log
637 < net/http/internal/httpcommon
638 < net/http;
639
640 # HTTP-aware packages
641
642 encoding/json, net/http
643 < expvar;
644
645 net/http, net/http/internal/ascii
646 < net/http/cookiejar, net/http/httputil;
647
648 net/http, flag
649 < net/http/httptest;
650
651 net/http, regexp
652 < net/http/cgi
653 < net/http/fcgi;
654
655 # Profiling
656 FMT, compress/gzip, encoding/binary, sort, text/tabwriter
657 < runtime/pprof;
658
659 OS, compress/gzip, internal/lazyregexp
660 < internal/profile;
661
662 html, internal/profile, net/http, runtime/pprof, runtime/trace
663 < net/http/pprof;
664
665 # RPC
666 encoding/gob, encoding/json, go/token, html/template, net/http
667 < net/rpc
668 < net/rpc/jsonrpc;
669
670 # System Information
671 bufio, bytes, internal/cpu, io, os, strings, sync
672 < internal/sysinfo;
673
674 # Test-only
675 log
676 < testing/iotest
677 < testing/fstest;
678
679 FMT, flag, math/rand
680 < testing/quick;
681
682 FMT, DEBUG, flag, runtime/trace, internal/sysinfo, math/rand
683 < testing;
684
685 log/slog, testing
686 < testing/slogtest;
687
688 FMT, crypto/sha256, encoding/binary, encoding/json,
689 go/ast, go/parser, go/token,
690 internal/godebug, math/rand, encoding/hex
691 < internal/fuzz;
692
693 OS, flag, testing, internal/cfg, internal/platform, internal/goroot
694 < internal/testenv;
695
696 OS, encoding/base64
697 < internal/obscuretestdata;
698
699 CGO, OS, fmt
700 < internal/testpty;
701
702 NET, testing, math/rand
703 < golang.org/x/net/nettest;
704
705 syscall
706 < os/exec/internal/fdtest;
707
708 FMT, sort
709 < internal/diff;
710
711 FMT
712 < internal/txtar;
713
714 CRYPTO-MATH, testing, internal/testenv, encoding/json
715 < crypto/internal/cryptotest;
716
717 CGO, FMT
718 < crypto/internal/sysrand/internal/seccomp;
719
720 FIPS
721 < crypto/internal/fips140/check/checktest;
722
723 # v2 execution trace parser.
724 FMT, io, internal/trace/tracev2
725 < internal/trace/version;
726
727 FMT, encoding/binary, internal/trace/version
728 < internal/trace/raw;
729
730 FMT, internal/trace/version, io, sort, encoding/binary
731 < internal/trace/internal/tracev1;
732
733 FMT, encoding/binary, internal/trace/version, internal/trace/internal/tracev1, container/heap, math/rand
734 < internal/trace;
735
736 regexp, internal/trace, internal/trace/raw, internal/txtar
737 < internal/trace/testtrace;
738
739 regexp, internal/txtar, internal/trace, internal/trace/raw
740 < internal/trace/internal/testgen;
741
742 # cmd/trace dependencies.
743 FMT,
744 embed,
745 encoding/json,
746 html/template,
747 internal/profile,
748 internal/trace,
749 internal/trace/traceviewer/format,
750 net/http
751 < internal/trace/traceviewer;
752
753 # Coverage.
754 FMT, hash/fnv, encoding/binary, regexp, sort, text/tabwriter,
755 internal/coverage, internal/coverage/uleb128
756 < internal/coverage/cmerge,
757 internal/coverage/pods,
758 internal/coverage/slicereader,
759 internal/coverage/slicewriter;
760
761 internal/coverage/slicereader, internal/coverage/slicewriter
762 < internal/coverage/stringtab
763 < internal/coverage/decodecounter, internal/coverage/decodemeta,
764 internal/coverage/encodecounter, internal/coverage/encodemeta;
765
766 internal/coverage/cmerge
767 < internal/coverage/cformat;
768
769 internal/coverage, crypto/sha256, FMT
770 < cmd/internal/cov/covcmd;
771
772 encoding/json,
773 runtime/debug,
774 internal/coverage/calloc,
775 internal/coverage/cformat,
776 internal/coverage/decodecounter, internal/coverage/decodemeta,
777 internal/coverage/encodecounter, internal/coverage/encodemeta,
778 internal/coverage/pods
779 < internal/coverage/cfile
780 < runtime/coverage;
781
782 internal/coverage/cfile, internal/fuzz, internal/testlog, runtime/pprof, regexp
783 < testing/internal/testdeps;
784
785 # Test-only packages can have anything they want
786 FMT, compress/gzip, embed, encoding/binary < encoding/json/internal/jsontest;
787 CGO, internal/syscall/unix < net/internal/cgotest;
788 FMT < math/big/internal/asmgen;
789 `
790
791
792 func listStdPkgs(goroot string) ([]string, error) {
793
794 var pkgs []string
795
796 src := filepath.Join(goroot, "src") + string(filepath.Separator)
797 walkFn := func(path string, d fs.DirEntry, err error) error {
798 if err != nil || !d.IsDir() || path == src {
799 return nil
800 }
801
802 base := filepath.Base(path)
803 if strings.HasPrefix(base, ".") || strings.HasPrefix(base, "_") || base == "testdata" {
804 return filepath.SkipDir
805 }
806
807 name := filepath.ToSlash(path[len(src):])
808 if name == "builtin" || name == "cmd" {
809 return filepath.SkipDir
810 }
811
812 pkgs = append(pkgs, strings.TrimPrefix(name, "vendor/"))
813 return nil
814 }
815 if err := filepath.WalkDir(src, walkFn); err != nil {
816 return nil, err
817 }
818 return pkgs, nil
819 }
820
821 func TestDependencies(t *testing.T) {
822 testenv.MustHaveSource(t)
823
824 ctxt := Default
825 all, err := listStdPkgs(ctxt.GOROOT)
826 if err != nil {
827 t.Fatal(err)
828 }
829 slices.Sort(all)
830
831 sawImport := map[string]map[string]bool{}
832 policy := depsPolicy(t)
833
834 for _, pkg := range all {
835 imports, err := findImports(pkg)
836 if err != nil {
837 t.Error(err)
838 continue
839 }
840 if sawImport[pkg] == nil {
841 sawImport[pkg] = map[string]bool{}
842 }
843 var bad []string
844 for _, imp := range imports {
845 sawImport[pkg][imp] = true
846 if !policy.HasEdge(pkg, imp) {
847 bad = append(bad, imp)
848 }
849 }
850 if bad != nil {
851 t.Errorf("unexpected dependency: %s imports %v", pkg, bad)
852 }
853 }
854 }
855
856 var buildIgnore = []byte("\n//go:build ignore")
857
858 func findImports(pkg string) ([]string, error) {
859 vpkg := pkg
860 if strings.HasPrefix(pkg, "golang.org") {
861 vpkg = "vendor/" + pkg
862 }
863 dir := filepath.Join(Default.GOROOT, "src", vpkg)
864 files, err := os.ReadDir(dir)
865 if err != nil {
866 return nil, err
867 }
868 var imports []string
869 var haveImport = map[string]bool{}
870 if pkg == "crypto/internal/boring" {
871 haveImport["C"] = true
872 }
873 fset := token.NewFileSet()
874 for _, file := range files {
875 name := file.Name()
876 if name == "slice_go14.go" || name == "slice_go18.go" {
877
878 continue
879 }
880 if !strings.HasSuffix(name, ".go") || strings.HasSuffix(name, "_test.go") {
881 continue
882 }
883 info := fileInfo{
884 name: filepath.Join(dir, name),
885 fset: fset,
886 }
887 f, err := os.Open(info.name)
888 if err != nil {
889 return nil, err
890 }
891 err = readGoInfo(f, &info)
892 f.Close()
893 if err != nil {
894 return nil, fmt.Errorf("reading %v: %v", name, err)
895 }
896 if info.parsed.Name.Name == "main" {
897 continue
898 }
899 if bytes.Contains(info.header, buildIgnore) {
900 continue
901 }
902 for _, imp := range info.imports {
903 path := imp.path
904 if !haveImport[path] {
905 haveImport[path] = true
906 imports = append(imports, path)
907 }
908 }
909 }
910 slices.Sort(imports)
911 return imports, nil
912 }
913
914
915 func depsPolicy(t *testing.T) *dag.Graph {
916 g, err := dag.Parse(depsRules)
917 if err != nil {
918 t.Fatal(err)
919 }
920 return g
921 }
922
923
924
925 func TestStdlibLowercase(t *testing.T) {
926 testenv.MustHaveSource(t)
927
928 ctxt := Default
929 all, err := listStdPkgs(ctxt.GOROOT)
930 if err != nil {
931 t.Fatal(err)
932 }
933
934 for _, pkgname := range all {
935 if strings.ToLower(pkgname) != pkgname {
936 t.Errorf("package %q should not use upper-case path", pkgname)
937 }
938 }
939 }
940
941
942 func TestFindImports(t *testing.T) {
943 imports, err := findImports("go/build")
944 if err != nil {
945 t.Fatal(err)
946 }
947 t.Logf("go/build imports %q", imports)
948 want := []string{"bytes", "os", "path/filepath", "strings"}
949 wantLoop:
950 for _, w := range want {
951 for _, imp := range imports {
952 if imp == w {
953 continue wantLoop
954 }
955 }
956 t.Errorf("expected to find %q in import list", w)
957 }
958 }
959
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