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/gc
98 < internal/runtime/math
99 < internal/runtime/maps
100 < internal/runtime/strconv
101 < internal/runtime/cgroup
102 < runtime
103 < sync/atomic
104 < internal/sync
105 < weak
106 < internal/synctest
107 < sync
108 < internal/bisect
109 < internal/godebug
110 < internal/reflectlite
111 < errors
112 < internal/oserror;
113
114 cmp, runtime, math/bits
115 < iter
116 < maps, slices;
117
118 internal/oserror, maps, slices
119 < RUNTIME;
120
121 RUNTIME
122 < sort
123 < container/heap
124 < unique;
125
126 RUNTIME
127 < io;
128
129 RUNTIME
130 < arena;
131
132 syscall !< io;
133 reflect !< sort;
134
135 RUNTIME, unicode/utf8
136 < path;
137
138 unicode !< path;
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 runtime/trace,
239 text/scanner,
240 text/tabwriter;
241
242 io, reflect
243 < internal/saferio;
244
245 # encodings
246 # core ones do not use fmt.
247 io, strconv, slices
248 < encoding, encoding/base32, encoding/base64;
249
250 encoding, reflect
251 < encoding/binary;
252
253 FMT, encoding < flag;
254
255 fmt !< encoding/base32, encoding/base64;
256
257 FMT, encoding, encoding/base32, encoding/base64, encoding/binary,
258 internal/saferio
259 < encoding/ascii85, encoding/csv, encoding/gob, encoding/hex,
260 encoding/pem, encoding/xml, mime;
261
262 STR, errors
263 < encoding/json/internal
264 < encoding/json/internal/jsonflags
265 < encoding/json/internal/jsonopts
266 < encoding/json/internal/jsonwire
267 < encoding/json/jsontext;
268
269 FMT,
270 encoding/hex,
271 encoding/base32,
272 encoding/base64,
273 encoding/binary,
274 encoding/json/jsontext,
275 encoding/json/internal,
276 encoding/json/internal/jsonflags,
277 encoding/json/internal/jsonopts,
278 encoding/json/internal/jsonwire
279 < encoding/json/v2
280 < encoding/json;
281
282 # hashes
283 io
284 < hash
285 < hash/adler32, hash/crc32, hash/crc64, hash/fnv;
286
287 # math/big
288 FMT, math/rand
289 < math/big;
290
291 # compression
292 FMT, encoding/binary, hash/adler32, hash/crc32, sort
293 < compress/bzip2, compress/flate, compress/lzw, internal/zstd
294 < archive/zip, compress/gzip, compress/zlib;
295
296 # templates
297 FMT
298 < text/template/parse;
299
300 internal/bytealg, internal/itoa, math/bits, slices, strconv, unique
301 < net/netip;
302
303 FMT, net/netip
304 < net/url;
305
306 net/url, text/template/parse
307 < text/template
308 < internal/lazytemplate;
309
310 # regexp
311 FMT, sort
312 < regexp/syntax
313 < regexp
314 < internal/lazyregexp;
315
316 encoding/json, html, text/template, regexp
317 < html/template;
318
319 # suffix array
320 encoding/binary, regexp
321 < index/suffixarray;
322
323 # executable parsing
324 FMT, encoding/binary, compress/zlib, internal/saferio, internal/zstd, sort
325 < runtime/debug
326 < debug/dwarf
327 < debug/elf, debug/gosym, debug/macho, debug/pe, debug/plan9obj, internal/xcoff
328 < debug/buildinfo
329 < DEBUG;
330
331 # go parser and friends.
332 FMT, sort
333 < internal/gover
334 < go/version
335 < go/token
336 < go/scanner
337 < go/ast
338 < go/internal/typeparams;
339
340 FMT
341 < go/build/constraint;
342
343 FMT, sort
344 < go/doc/comment;
345
346 go/internal/typeparams, go/build/constraint
347 < go/parser;
348
349 go/doc/comment, go/parser, text/tabwriter
350 < go/printer
351 < go/format;
352
353 math/big, go/token
354 < go/constant;
355
356 FMT, internal/goexperiment
357 < internal/buildcfg;
358
359 container/heap, go/constant, go/parser, internal/buildcfg, internal/goversion, internal/types/errors
360 < go/types;
361
362 # The vast majority of standard library packages should not be resorting to regexp.
363 # go/types is a good chokepoint. It shouldn't use regexp, nor should anything
364 # that is low-enough level to be used by go/types.
365 regexp !< go/types;
366
367 go/doc/comment, go/parser, internal/lazyregexp, text/template
368 < go/doc;
369
370 go/build/constraint, go/doc, go/parser, internal/buildcfg, internal/goroot, internal/goversion, internal/platform, internal/syslist
371 < go/build;
372
373 # databases
374 FMT
375 < database/sql/internal
376 < database/sql/driver;
377
378 database/sql/driver, math/rand/v2 < database/sql;
379
380 # images
381 FMT, compress/lzw, compress/zlib
382 < image/color
383 < image, image/color/palette
384 < image/internal/imageutil
385 < image/draw
386 < image/gif, image/jpeg, image/png;
387
388 # cgo, delayed as long as possible.
389 # If you add a dependency on CGO, you must add the package
390 # to cgoPackages in cmd/dist/test.go as well.
391 RUNTIME
392 < C
393 < runtime/cgo
394 < CGO
395 < runtime/msan, runtime/asan;
396
397 # runtime/race
398 NONE < runtime/race/internal/amd64v1;
399 NONE < runtime/race/internal/amd64v3;
400 CGO, runtime/race/internal/amd64v1, runtime/race/internal/amd64v3 < runtime/race;
401
402 # Bulk of the standard library must not use cgo.
403 # The prohibition stops at net and os/user.
404 C !< fmt, go/types, CRYPTO-MATH, log/slog;
405
406 CGO, OS
407 < plugin;
408
409 CGO, FMT
410 < os/user
411 < archive/tar;
412
413 sync
414 < internal/singleflight;
415
416 os
417 < golang.org/x/net/dns/dnsmessage,
418 golang.org/x/net/lif;
419
420 os, net/netip
421 < internal/routebsd;
422
423 # net is unavoidable when doing any networking,
424 # so large dependencies must be kept out.
425 # This is a long-looking list but most of these
426 # are small with few dependencies.
427 CGO,
428 golang.org/x/net/dns/dnsmessage,
429 golang.org/x/net/lif,
430 internal/godebug,
431 internal/nettrace,
432 internal/poll,
433 internal/routebsd,
434 internal/singleflight,
435 net/netip,
436 os,
437 sort
438 < net;
439
440 fmt, unicode !< net;
441 math/rand !< net; # net uses runtime instead
442
443 # NET is net plus net-helper packages.
444 FMT, net
445 < net/textproto;
446
447 mime, net/textproto, net/url
448 < NET;
449
450 # logging - most packages should not import; http and up is allowed
451 FMT, log/internal
452 < log;
453
454 log, log/slog !< crypto/tls, database/sql, go/importer, testing;
455
456 FMT, log, net
457 < log/syslog;
458
459 RUNTIME
460 < log/slog/internal, log/slog/internal/buffer;
461
462 FMT,
463 encoding, encoding/json,
464 log, log/internal,
465 log/slog/internal, log/slog/internal/buffer,
466 slices
467 < log/slog
468 < log/slog/internal/slogtest, log/slog/internal/benchmarks;
469
470 NET, log
471 < net/mail;
472
473 # FIPS is the FIPS 140 module.
474 # It must not depend on external crypto packages.
475 # Package hash is ok as it's only the interface.
476 # See also fips140deps.AllowedInternalPackages.
477
478 io, math/rand/v2 < crypto/internal/randutil;
479
480 STR < crypto/internal/impl;
481
482 OS < crypto/internal/sysrand
483 < crypto/internal/entropy;
484
485 internal/byteorder < crypto/internal/fips140deps/byteorder;
486 internal/cpu, internal/goarch < crypto/internal/fips140deps/cpu;
487 internal/godebug < crypto/internal/fips140deps/godebug;
488
489 STR, hash,
490 crypto/internal/impl,
491 crypto/internal/entropy,
492 crypto/internal/randutil,
493 crypto/internal/fips140deps/byteorder,
494 crypto/internal/fips140deps/cpu,
495 crypto/internal/fips140deps/godebug
496 < crypto/internal/fips140
497 < crypto/internal/fips140/alias
498 < crypto/internal/fips140/subtle
499 < crypto/internal/fips140/sha256
500 < crypto/internal/fips140/sha512
501 < crypto/internal/fips140/sha3
502 < crypto/internal/fips140/hmac
503 < crypto/internal/fips140/check
504 < crypto/internal/fips140/pbkdf2
505 < crypto/internal/fips140/aes
506 < crypto/internal/fips140/drbg
507 < crypto/internal/fips140/aes/gcm
508 < crypto/internal/fips140/hkdf
509 < crypto/internal/fips140/mlkem
510 < crypto/internal/fips140/ssh
511 < crypto/internal/fips140/tls12
512 < crypto/internal/fips140/tls13
513 < crypto/internal/fips140/bigmod
514 < crypto/internal/fips140/nistec/fiat
515 < crypto/internal/fips140/nistec
516 < crypto/internal/fips140/ecdh
517 < crypto/internal/fips140/ecdsa
518 < crypto/internal/fips140/edwards25519/field
519 < crypto/internal/fips140/edwards25519
520 < crypto/internal/fips140/ed25519
521 < crypto/internal/fips140/rsa
522 < FIPS < crypto/fips140;
523
524 crypto !< FIPS;
525
526 # CRYPTO is core crypto algorithms - no cgo, fmt, net.
527 # Mostly wrappers around the FIPS module.
528
529 NONE < crypto/internal/boring/sig, crypto/internal/boring/syso;
530 sync/atomic < crypto/internal/boring/bcache;
531
532 FIPS, internal/godebug, embed,
533 crypto/internal/boring/sig,
534 crypto/internal/boring/syso,
535 crypto/internal/boring/bcache
536 < crypto/internal/fips140only
537 < crypto
538 < crypto/subtle
539 < crypto/sha3
540 < crypto/internal/fips140hash
541 < crypto/cipher
542 < crypto/internal/boring
543 < crypto/boring
544 < crypto/aes,
545 crypto/des,
546 crypto/rc4,
547 crypto/md5,
548 crypto/sha1,
549 crypto/sha256,
550 crypto/sha512,
551 crypto/hmac,
552 crypto/hkdf,
553 crypto/pbkdf2,
554 crypto/ecdh,
555 crypto/mlkem
556 < CRYPTO;
557
558 CGO, fmt, net !< CRYPTO;
559
560 # CRYPTO-MATH is crypto that exposes math/big APIs - no cgo, net; fmt now ok.
561
562 CRYPTO, FMT, math/big, internal/saferio
563 < crypto/internal/boring/bbig
564 < crypto/internal/fips140cache
565 < crypto/rand
566 < crypto/ed25519 # depends on crypto/rand.Reader
567 < encoding/asn1
568 < golang.org/x/crypto/cryptobyte/asn1
569 < golang.org/x/crypto/cryptobyte
570 < crypto/dsa, crypto/elliptic, crypto/rsa
571 < crypto/ecdsa
572 < CRYPTO-MATH;
573
574 CGO, net !< CRYPTO-MATH;
575
576 # TLS, Prince of Dependencies.
577
578 crypto/fips140, sync/atomic < crypto/tls/internal/fips140tls;
579
580 crypto/internal/boring/sig, crypto/tls/internal/fips140tls < crypto/tls/fipsonly;
581
582 CRYPTO, golang.org/x/sys/cpu, encoding/binary, reflect
583 < golang.org/x/crypto/internal/alias
584 < golang.org/x/crypto/internal/subtle
585 < golang.org/x/crypto/chacha20
586 < golang.org/x/crypto/internal/poly1305
587 < golang.org/x/crypto/chacha20poly1305;
588
589 CRYPTO-MATH, NET, container/list, encoding/hex, encoding/pem,
590 golang.org/x/crypto/chacha20poly1305, crypto/tls/internal/fips140tls
591 < crypto/internal/hpke
592 < crypto/x509/internal/macos
593 < crypto/x509/pkix
594 < crypto/x509
595 < crypto/tls;
596
597 # crypto-aware packages
598
599 DEBUG, go/build, go/types, text/scanner, crypto/sha256
600 < internal/pkgbits, internal/exportdata
601 < go/internal/gcimporter, go/internal/gccgoimporter, go/internal/srcimporter
602 < go/importer;
603
604 NET, crypto/rand, mime/quotedprintable
605 < mime/multipart;
606
607 crypto/tls
608 < net/smtp;
609
610 crypto/rand
611 < hash/maphash; # for purego implementation
612
613 # HTTP, King of Dependencies.
614
615 FMT
616 < golang.org/x/net/http2/hpack
617 < net/http/internal, net/http/internal/ascii, net/http/internal/testcert;
618
619 FMT, NET, container/list, encoding/binary, log
620 < golang.org/x/text/transform
621 < golang.org/x/text/unicode/norm
622 < golang.org/x/text/unicode/bidi
623 < golang.org/x/text/secure/bidirule
624 < golang.org/x/net/idna
625 < golang.org/x/net/http/httpguts, golang.org/x/net/http/httpproxy;
626
627 NET, crypto/tls
628 < net/http/httptrace;
629
630 compress/gzip,
631 golang.org/x/net/http/httpguts,
632 golang.org/x/net/http/httpproxy,
633 golang.org/x/net/http2/hpack,
634 net/http/internal,
635 net/http/internal/ascii,
636 net/http/internal/testcert,
637 net/http/httptrace,
638 mime/multipart,
639 log
640 < net/http/internal/httpcommon
641 < net/http;
642
643 # HTTP-aware packages
644
645 encoding/json, net/http
646 < expvar;
647
648 net/http, net/http/internal/ascii
649 < net/http/cookiejar, net/http/httputil;
650
651 net/http, flag
652 < net/http/httptest;
653
654 net/http, regexp
655 < net/http/cgi
656 < net/http/fcgi;
657
658 # Profiling
659 FMT, compress/gzip, encoding/binary, sort, text/tabwriter
660 < runtime/pprof;
661
662 OS, compress/gzip, internal/lazyregexp
663 < internal/profile;
664
665 html, internal/profile, net/http, runtime/pprof, runtime/trace
666 < net/http/pprof;
667
668 # RPC
669 encoding/gob, encoding/json, go/token, html/template, net/http
670 < net/rpc
671 < net/rpc/jsonrpc;
672
673 # System Information
674 bufio, bytes, internal/cpu, io, os, strings, sync
675 < internal/sysinfo;
676
677 # Test-only
678 log
679 < testing/iotest
680 < testing/fstest;
681
682 FMT, flag, math/rand
683 < testing/quick;
684
685 FMT, DEBUG, flag, runtime/trace, internal/sysinfo, math/rand
686 < testing;
687
688 log/slog, testing
689 < testing/slogtest;
690
691 FMT, crypto/sha256, encoding/binary, encoding/json,
692 go/ast, go/parser, go/token,
693 internal/godebug, math/rand, encoding/hex
694 < internal/fuzz;
695
696 OS, flag, testing, internal/cfg, internal/platform, internal/goroot
697 < internal/testenv;
698
699 OS, encoding/base64
700 < internal/obscuretestdata;
701
702 CGO, OS, fmt
703 < internal/testpty;
704
705 NET, testing, math/rand
706 < golang.org/x/net/nettest;
707
708 syscall
709 < os/exec/internal/fdtest;
710
711 FMT, sort
712 < internal/diff;
713
714 FMT
715 < internal/txtar;
716
717 internal/synctest, testing
718 < testing/synctest;
719
720 testing
721 < internal/testhash;
722
723 CRYPTO-MATH, testing, internal/testenv, internal/testhash, encoding/json
724 < crypto/internal/cryptotest;
725
726 CGO, FMT
727 < crypto/internal/sysrand/internal/seccomp;
728
729 FIPS
730 < crypto/internal/fips140/check/checktest;
731
732 # v2 execution trace parser.
733 FMT, io, internal/trace/tracev2
734 < internal/trace/version;
735
736 FMT, encoding/binary, internal/trace/version
737 < internal/trace/raw;
738
739 FMT, internal/trace/version, io, sort, encoding/binary
740 < internal/trace/internal/tracev1;
741
742 FMT, encoding/binary, internal/trace/version, internal/trace/internal/tracev1, container/heap, math/rand
743 < internal/trace;
744
745 regexp, internal/trace, internal/trace/raw, internal/txtar
746 < internal/trace/testtrace;
747
748 regexp, internal/txtar, internal/trace, internal/trace/raw
749 < internal/trace/internal/testgen;
750
751 # cmd/trace dependencies.
752 FMT,
753 embed,
754 encoding/json,
755 html/template,
756 internal/profile,
757 internal/trace,
758 internal/trace/traceviewer/format,
759 net/http
760 < internal/trace/traceviewer;
761
762 # Coverage.
763 FMT, hash/fnv, encoding/binary, regexp, sort, text/tabwriter,
764 internal/coverage, internal/coverage/uleb128
765 < internal/coverage/cmerge,
766 internal/coverage/pods,
767 internal/coverage/slicereader,
768 internal/coverage/slicewriter;
769
770 internal/coverage/slicereader, internal/coverage/slicewriter
771 < internal/coverage/stringtab
772 < internal/coverage/decodecounter, internal/coverage/decodemeta,
773 internal/coverage/encodecounter, internal/coverage/encodemeta;
774
775 internal/coverage/cmerge
776 < internal/coverage/cformat;
777
778 internal/coverage, crypto/sha256, FMT
779 < cmd/internal/cov/covcmd;
780
781 encoding/json,
782 runtime/debug,
783 internal/coverage/calloc,
784 internal/coverage/cformat,
785 internal/coverage/decodecounter, internal/coverage/decodemeta,
786 internal/coverage/encodecounter, internal/coverage/encodemeta,
787 internal/coverage/pods
788 < internal/coverage/cfile
789 < runtime/coverage;
790
791 internal/coverage/cfile, internal/fuzz, internal/testlog, runtime/pprof, regexp
792 < testing/internal/testdeps;
793
794 # Test-only packages can have anything they want
795 FMT, compress/gzip, embed, encoding/binary < encoding/json/internal/jsontest;
796 CGO, internal/syscall/unix < net/internal/cgotest;
797 FMT < math/big/internal/asmgen;
798
799 FMT, testing < internal/cgrouptest;
800 `
801
802
803 func listStdPkgs(goroot string) ([]string, error) {
804
805 var pkgs []string
806
807 src := filepath.Join(goroot, "src") + string(filepath.Separator)
808 walkFn := func(path string, d fs.DirEntry, err error) error {
809 if err != nil || !d.IsDir() || path == src {
810 return nil
811 }
812
813 base := filepath.Base(path)
814 if strings.HasPrefix(base, ".") || strings.HasPrefix(base, "_") || base == "testdata" {
815 return filepath.SkipDir
816 }
817
818 name := filepath.ToSlash(path[len(src):])
819 if name == "builtin" || name == "cmd" {
820 return filepath.SkipDir
821 }
822
823 pkgs = append(pkgs, strings.TrimPrefix(name, "vendor/"))
824 return nil
825 }
826 if err := filepath.WalkDir(src, walkFn); err != nil {
827 return nil, err
828 }
829 return pkgs, nil
830 }
831
832 func TestDependencies(t *testing.T) {
833 testenv.MustHaveSource(t)
834
835 ctxt := Default
836 all, err := listStdPkgs(ctxt.GOROOT)
837 if err != nil {
838 t.Fatal(err)
839 }
840 slices.Sort(all)
841
842 sawImport := map[string]map[string]bool{}
843 policy := depsPolicy(t)
844
845 for _, pkg := range all {
846 imports, err := findImports(pkg)
847 if err != nil {
848 t.Error(err)
849 continue
850 }
851 if sawImport[pkg] == nil {
852 sawImport[pkg] = map[string]bool{}
853 }
854 var bad []string
855 for _, imp := range imports {
856 sawImport[pkg][imp] = true
857 if !policy.HasEdge(pkg, imp) {
858 bad = append(bad, imp)
859 }
860 }
861 if bad != nil {
862 t.Errorf("unexpected dependency: %s imports %v", pkg, bad)
863 }
864 }
865 }
866
867 var buildIgnore = []byte("\n//go:build ignore")
868
869 func findImports(pkg string) ([]string, error) {
870 vpkg := pkg
871 if strings.HasPrefix(pkg, "golang.org") {
872 vpkg = "vendor/" + pkg
873 }
874 dir := filepath.Join(Default.GOROOT, "src", vpkg)
875 files, err := os.ReadDir(dir)
876 if err != nil {
877 return nil, err
878 }
879 var imports []string
880 var haveImport = map[string]bool{}
881 if pkg == "crypto/internal/boring" {
882 haveImport["C"] = true
883 }
884 fset := token.NewFileSet()
885 for _, file := range files {
886 name := file.Name()
887 if name == "slice_go14.go" || name == "slice_go18.go" {
888
889 continue
890 }
891 if !strings.HasSuffix(name, ".go") || strings.HasSuffix(name, "_test.go") {
892 continue
893 }
894 info := fileInfo{
895 name: filepath.Join(dir, name),
896 fset: fset,
897 }
898 f, err := os.Open(info.name)
899 if err != nil {
900 return nil, err
901 }
902 err = readGoInfo(f, &info)
903 f.Close()
904 if err != nil {
905 return nil, fmt.Errorf("reading %v: %v", name, err)
906 }
907 if info.parsed.Name.Name == "main" {
908 continue
909 }
910 if bytes.Contains(info.header, buildIgnore) {
911 continue
912 }
913 for _, imp := range info.imports {
914 path := imp.path
915 if !haveImport[path] {
916 haveImport[path] = true
917 imports = append(imports, path)
918 }
919 }
920 }
921 slices.Sort(imports)
922 return imports, nil
923 }
924
925
926 func depsPolicy(t *testing.T) *dag.Graph {
927 g, err := dag.Parse(depsRules)
928 if err != nil {
929 t.Fatal(err)
930 }
931 return g
932 }
933
934
935
936 func TestStdlibLowercase(t *testing.T) {
937 testenv.MustHaveSource(t)
938
939 ctxt := Default
940 all, err := listStdPkgs(ctxt.GOROOT)
941 if err != nil {
942 t.Fatal(err)
943 }
944
945 for _, pkgname := range all {
946 if strings.ToLower(pkgname) != pkgname {
947 t.Errorf("package %q should not use upper-case path", pkgname)
948 }
949 }
950 }
951
952
953 func TestFindImports(t *testing.T) {
954 imports, err := findImports("go/build")
955 if err != nil {
956 t.Fatal(err)
957 }
958 t.Logf("go/build imports %q", imports)
959 want := []string{"bytes", "os", "path/filepath", "strings"}
960 wantLoop:
961 for _, w := range want {
962 for _, imp := range imports {
963 if imp == w {
964 continue wantLoop
965 }
966 }
967 t.Errorf("expected to find %q in import list", w)
968 }
969 }
970
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