Source file
src/go/build/deps_test.go
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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
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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/itoa,
58 internal/nettrace,
59 internal/platform,
60 internal/profilerecord,
61 internal/runtime/pprof/label,
62 internal/syslist,
63 internal/trace/tracev2,
64 internal/trace/traceviewer/format,
65 log/internal,
66 math/bits,
67 structs,
68 unicode,
69 unicode/utf8,
70 unicode/utf16;
71
72 internal/goarch < internal/abi;
73 internal/byteorder, internal/cpu, internal/goarch < internal/chacha8rand;
74 internal/goarch, math/bits < internal/strconv;
75
76 internal/cpu, internal/strconv < simd/archsimd;
77
78 # RUNTIME is the core runtime group of packages, all of them very light-weight.
79 internal/abi,
80 internal/chacha8rand,
81 internal/coverage/rtcov,
82 internal/cpu,
83 internal/goarch,
84 internal/godebugs,
85 internal/goexperiment,
86 internal/goos,
87 internal/itoa,
88 internal/profilerecord,
89 internal/runtime/pprof/label,
90 internal/strconv,
91 internal/trace/tracev2,
92 math/bits,
93 structs
94 < internal/bytealg
95 < internal/stringslite
96 < internal/unsafeheader
97 < internal/race
98 < internal/msan
99 < internal/asan
100 < internal/runtime/sys
101 < internal/runtime/syscall/linux
102 < internal/runtime/syscall/windows
103 < internal/runtime/atomic
104 < internal/runtime/exithook
105 < internal/runtime/gc
106 < internal/runtime/math
107 < internal/runtime/maps
108 < internal/runtime/cgroup
109 < internal/runtime/gc/scan
110 < runtime
111 < runtime/secret
112 < sync/atomic
113 < internal/sync
114 < weak
115 < internal/synctest
116 < sync
117 < internal/bisect
118 < internal/godebug
119 < internal/reflectlite
120 < errors
121 < internal/oserror;
122
123 cmp, runtime, math/bits
124 < iter
125 < maps, slices;
126
127 internal/oserror, maps, slices
128 < RUNTIME;
129
130 RUNTIME
131 < sort
132 < container/heap
133 < unique;
134
135 RUNTIME
136 < io;
137
138 RUNTIME
139 < arena;
140
141 syscall !< io;
142 reflect !< sort;
143
144 RUNTIME, unicode/utf8
145 < path;
146
147 unicode !< path;
148
149 # SYSCALL is RUNTIME plus the packages necessary for basic system calls.
150 RUNTIME, unicode/utf8, unicode/utf16, internal/synctest
151 < internal/syscall/windows/sysdll, syscall/js
152 < syscall
153 < internal/syscall/unix, internal/syscall/windows, internal/syscall/windows/registry
154 < internal/syscall/execenv
155 < SYSCALL;
156
157 # TIME is SYSCALL plus the core packages about time, including context.
158 SYSCALL
159 < time/tzdata
160 < time
161 < context
162 < TIME;
163
164 TIME, io, path, slices
165 < io/fs;
166
167 # MATH is RUNTIME plus the basic math packages.
168 RUNTIME
169 < math
170 < MATH;
171
172 unicode !< math;
173
174 MATH
175 < math/cmplx;
176
177 MATH
178 < math/rand, math/rand/v2;
179
180 MATH
181 < runtime/metrics;
182
183 MATH, unicode/utf8
184 < strconv;
185
186 unicode !< strconv;
187
188 # STR is basic string and buffer manipulation.
189 RUNTIME, io, unicode/utf8, unicode/utf16, unicode
190 < bytes, strings
191 < bufio;
192
193 bufio, path, strconv
194 < STR;
195
196 # OS is basic OS access, including helpers (path/filepath, os/exec, etc).
197 # OS includes string routines, but those must be layered above package os.
198 # OS does not include reflection.
199 io/fs
200 < internal/testlog
201 < internal/poll
202 < internal/filepathlite
203 < os
204 < os/signal;
205
206 io/fs
207 < embed;
208
209 unicode, fmt !< net, os, os/signal;
210
211 os/signal, internal/filepathlite, STR
212 < path/filepath
213 < io/ioutil;
214
215 path/filepath, internal/godebug < os/exec;
216
217 io/ioutil, os/exec, os/signal
218 < OS;
219
220 reflect !< OS;
221
222 OS
223 < golang.org/x/sys/cpu;
224
225 # FMT is OS (which includes string routines) plus reflect and fmt.
226 # It does not include package log, which should be avoided in core packages.
227 arena, strconv, unicode
228 < reflect;
229
230 os, reflect
231 < internal/fmtsort
232 < fmt;
233
234 OS, fmt
235 < FMT;
236
237 log !< FMT;
238
239 # Misc packages needing only FMT.
240 FMT
241 < html,
242 internal/dag,
243 internal/goroot,
244 internal/types/errors,
245 mime/quotedprintable,
246 net/internal/socktest,
247 runtime/trace,
248 text/scanner,
249 text/tabwriter;
250
251 io, reflect
252 < internal/saferio;
253
254 # encodings
255 # core ones do not use fmt.
256 io, strconv, slices
257 < encoding, encoding/base32, encoding/base64;
258
259 encoding, reflect
260 < encoding/binary;
261
262 FMT, encoding < flag;
263
264 fmt !< encoding/base32, encoding/base64;
265
266 FMT, encoding, encoding/base32, encoding/base64, encoding/binary,
267 internal/saferio
268 < encoding/ascii85, encoding/csv, encoding/gob, encoding/hex,
269 encoding/pem, encoding/xml, mime;
270
271 STR, errors
272 < encoding/json/internal
273 < encoding/json/internal/jsonflags
274 < encoding/json/internal/jsonopts
275 < encoding/json/internal/jsonwire
276 < encoding/json/jsontext;
277
278 FMT,
279 encoding/hex,
280 encoding/base32,
281 encoding/base64,
282 encoding/binary,
283 encoding/json/jsontext,
284 encoding/json/internal,
285 encoding/json/internal/jsonflags,
286 encoding/json/internal/jsonopts,
287 encoding/json/internal/jsonwire
288 < encoding/json/v2
289 < encoding/json;
290
291 # hashes
292 io
293 < hash
294 < hash/adler32, hash/crc32, hash/crc64, hash/fnv;
295
296 # math/big
297 FMT, math/rand
298 < math/big;
299
300 # compression
301 FMT, encoding/binary, hash/adler32, hash/crc32, sort
302 < compress/bzip2, compress/flate, compress/lzw, internal/zstd
303 < archive/zip, compress/gzip, compress/zlib;
304
305 # templates
306 FMT
307 < text/template/parse;
308
309 internal/bytealg, math/bits, slices, strconv, unique
310 < net/netip;
311
312 FMT, net/netip
313 < net/url;
314
315 net/url, text/template/parse
316 < text/template
317 < internal/lazytemplate;
318
319 # regexp
320 FMT, sort
321 < regexp/syntax
322 < regexp
323 < internal/lazyregexp;
324
325 encoding/json, html, text/template, regexp
326 < html/template;
327
328 # suffix array
329 encoding/binary, regexp
330 < index/suffixarray;
331
332 # executable parsing
333 FMT, encoding/binary, compress/zlib, internal/saferio, internal/zstd, sort
334 < runtime/debug
335 < debug/dwarf
336 < debug/elf, debug/gosym, debug/macho, debug/pe, debug/plan9obj, internal/xcoff
337 < debug/buildinfo
338 < DEBUG;
339
340 # go parser and friends.
341 FMT, sort
342 < internal/gover
343 < go/version
344 < go/token
345 < go/scanner
346 < go/ast
347 < go/internal/typeparams;
348
349 FMT
350 < go/build/constraint;
351
352 FMT, sort
353 < go/doc/comment;
354
355 go/internal/typeparams, go/build/constraint
356 < go/parser;
357
358 go/doc/comment, go/parser, text/tabwriter
359 < go/printer
360 < go/format;
361
362 math/big, go/token
363 < go/constant;
364
365 FMT, internal/goexperiment
366 < internal/buildcfg;
367
368 container/heap, go/constant, go/parser, internal/buildcfg, internal/goversion, internal/types/errors
369 < go/types;
370
371 # The vast majority of standard library packages should not be resorting to regexp.
372 # go/types is a good chokepoint. It shouldn't use regexp, nor should anything
373 # that is low-enough level to be used by go/types.
374 regexp !< go/types;
375
376 go/doc/comment, go/parser, internal/lazyregexp, text/template
377 < go/doc;
378
379 go/build/constraint, go/doc, go/parser, internal/buildcfg, internal/goroot, internal/goversion, internal/platform, internal/syslist
380 < go/build;
381
382 # databases
383 FMT
384 < database/sql/internal
385 < database/sql/driver;
386
387 database/sql/driver, math/rand/v2 < database/sql;
388
389 # images
390 FMT, compress/lzw, compress/zlib
391 < image/color
392 < image, image/color/palette
393 < image/internal/imageutil
394 < image/draw
395 < image/gif, image/jpeg, image/png;
396
397 # cgo, delayed as long as possible.
398 # If you add a dependency on CGO, you must add the package
399 # to cgoPackages in cmd/dist/test.go as well.
400 RUNTIME
401 < C
402 < runtime/cgo
403 < CGO
404 < runtime/msan, runtime/asan;
405
406 # runtime/race
407 NONE < runtime/race/internal/amd64v1;
408 NONE < runtime/race/internal/amd64v3;
409 CGO, runtime/race/internal/amd64v1, runtime/race/internal/amd64v3 < runtime/race;
410
411 # Bulk of the standard library must not use cgo.
412 # The prohibition stops at net and os/user.
413 C !< fmt, go/types, CRYPTO-MATH, log/slog;
414
415 CGO, OS
416 < plugin;
417
418 CGO, FMT
419 < os/user
420 < archive/tar;
421
422 sync
423 < internal/singleflight;
424
425 os
426 < golang.org/x/net/dns/dnsmessage,
427 golang.org/x/net/lif;
428
429 os, net/netip
430 < internal/routebsd;
431
432 # net is unavoidable when doing any networking,
433 # so large dependencies must be kept out.
434 # This is a long-looking list but most of these
435 # are small with few dependencies.
436 CGO,
437 golang.org/x/net/dns/dnsmessage,
438 golang.org/x/net/lif,
439 internal/godebug,
440 internal/nettrace,
441 internal/poll,
442 internal/routebsd,
443 internal/singleflight,
444 net/netip,
445 os,
446 sort
447 < net;
448
449 fmt, unicode !< net;
450 math/rand !< net; # net uses runtime instead
451
452 # NET is net plus net-helper packages.
453 FMT, net
454 < net/textproto;
455
456 mime, net/textproto, net/url
457 < NET;
458
459 # logging - most packages should not import; http and up is allowed
460 FMT, log/internal
461 < log;
462
463 log, log/slog !< crypto/tls, database/sql, go/importer, testing;
464
465 FMT, log, net
466 < log/syslog;
467
468 RUNTIME
469 < log/slog/internal, log/slog/internal/buffer;
470
471 FMT,
472 encoding, encoding/json,
473 log, log/internal,
474 log/slog/internal, log/slog/internal/buffer,
475 slices
476 < log/slog
477 < log/slog/internal/slogtest, log/slog/internal/benchmarks;
478
479 NET, log
480 < net/mail;
481
482 # FIPS is the FIPS 140 module.
483 # It must not depend on external crypto packages.
484 # Package hash is ok as it's only the interface.
485 # See also fips140deps.AllowedInternalPackages.
486
487 io, math/rand/v2 < crypto/internal/randutil;
488
489 NONE < crypto/internal/constanttime;
490
491 STR < crypto/internal/impl;
492
493 OS < crypto/internal/sysrand
494 < crypto/internal/entropy;
495
496 internal/byteorder < crypto/internal/fips140deps/byteorder;
497 internal/cpu, internal/goarch < crypto/internal/fips140deps/cpu;
498 internal/godebug < crypto/internal/fips140deps/godebug;
499 time, internal/syscall/windows < crypto/internal/fips140deps/time;
500
501 crypto/internal/fips140deps/time, errors, math/bits, sync/atomic, unsafe
502 < crypto/internal/entropy/v1.0.0;
503
504 STR, hash,
505 crypto/internal/impl,
506 crypto/internal/entropy,
507 crypto/internal/randutil,
508 crypto/internal/constanttime,
509 crypto/internal/entropy/v1.0.0,
510 crypto/internal/fips140deps/byteorder,
511 crypto/internal/fips140deps/cpu,
512 crypto/internal/fips140deps/godebug
513 < crypto/internal/fips140
514 < crypto/internal/fips140/alias
515 < crypto/internal/fips140/subtle
516 < crypto/internal/fips140/sha256
517 < crypto/internal/fips140/sha512
518 < crypto/internal/fips140/sha3
519 < crypto/internal/fips140/hmac
520 < crypto/internal/fips140/check
521 < crypto/internal/fips140/pbkdf2
522 < crypto/internal/fips140/aes
523 < crypto/internal/fips140/drbg
524 < crypto/internal/fips140/aes/gcm
525 < crypto/internal/fips140/hkdf
526 < crypto/internal/fips140/mlkem
527 < crypto/internal/fips140/mldsa
528 < crypto/internal/fips140/ssh
529 < crypto/internal/fips140/tls12
530 < crypto/internal/fips140/tls13
531 < crypto/internal/fips140/bigmod
532 < crypto/internal/fips140/nistec/fiat
533 < crypto/internal/fips140/nistec
534 < crypto/internal/fips140/ecdh
535 < crypto/internal/fips140/ecdsa
536 < crypto/internal/fips140/edwards25519/field
537 < crypto/internal/fips140/edwards25519
538 < crypto/internal/fips140/ed25519
539 < crypto/internal/fips140/rsa
540 < crypto/fips140 < FIPS;
541
542 crypto !< FIPS;
543
544 # CRYPTO is core crypto algorithms - no cgo, fmt, net.
545 # Mostly wrappers around the FIPS module.
546
547 NONE < crypto/internal/boring/sig, crypto/internal/boring/syso;
548 sync/atomic < crypto/internal/boring/bcache;
549
550 FIPS, internal/godebug, embed,
551 crypto/internal/boring/sig,
552 crypto/internal/boring/syso,
553 crypto/internal/boring/bcache
554 < crypto/internal/fips140only
555 < crypto
556 < crypto/subtle
557 < crypto/sha3
558 < crypto/internal/fips140hash
559 < crypto/cipher
560 < crypto/internal/boring
561 < crypto/boring
562 < crypto/internal/rand
563 < crypto/aes,
564 crypto/des,
565 crypto/rc4,
566 crypto/md5,
567 crypto/sha1,
568 crypto/sha256,
569 crypto/sha512,
570 crypto/hmac,
571 crypto/hkdf,
572 crypto/pbkdf2,
573 crypto/ecdh,
574 crypto/mlkem
575 < CRYPTO;
576
577 CGO, fmt, net !< CRYPTO;
578
579 # CRYPTO-MATH is crypto that exposes math/big APIs - no cgo, net; fmt now ok.
580
581 CRYPTO, FMT, math/big, internal/saferio
582 < crypto/internal/boring/bbig
583 < crypto/internal/fips140cache
584 < crypto/rand
585 < crypto/ed25519 # depends on crypto/rand.Reader
586 < encoding/asn1
587 < golang.org/x/crypto/cryptobyte/asn1
588 < golang.org/x/crypto/cryptobyte
589 < crypto/dsa, crypto/elliptic, crypto/rsa
590 < crypto/ecdsa
591 < CRYPTO-MATH;
592
593 CGO, net !< CRYPTO-MATH;
594
595 # TLS, Prince of Dependencies.
596
597 crypto/fips140, sync/atomic < crypto/tls/internal/fips140tls;
598
599 crypto/internal/boring/sig, crypto/tls/internal/fips140tls < crypto/tls/fipsonly;
600
601 CRYPTO, golang.org/x/sys/cpu, encoding/binary, reflect
602 < golang.org/x/crypto/internal/alias
603 < golang.org/x/crypto/internal/subtle
604 < golang.org/x/crypto/chacha20
605 < golang.org/x/crypto/internal/poly1305
606 < golang.org/x/crypto/chacha20poly1305;
607
608 CRYPTO-MATH, golang.org/x/crypto/chacha20poly1305
609 < crypto/hpke;
610
611 CRYPTO-MATH, NET, container/list, encoding/hex, encoding/pem, crypto/hpke,
612 golang.org/x/crypto/chacha20poly1305, crypto/tls/internal/fips140tls
613 < crypto/x509/internal/macos
614 < crypto/x509/pkix
615 < crypto/x509
616 < crypto/tls;
617
618 # crypto-aware packages
619
620 DEBUG, go/build, go/types, text/scanner, crypto/sha256
621 < internal/pkgbits, internal/exportdata
622 < go/internal/gcimporter, go/internal/gccgoimporter, go/internal/srcimporter
623 < go/importer;
624
625 NET, crypto/rand, mime/quotedprintable
626 < mime/multipart;
627
628 crypto/tls
629 < net/smtp;
630
631 crypto/rand
632 < hash/maphash; # for purego implementation
633
634 # HTTP, King of Dependencies.
635
636 FMT
637 < golang.org/x/net/http2/hpack
638 < net/http/internal, net/http/internal/ascii, net/http/internal/testcert;
639
640 FMT, NET, container/list, encoding/binary, log
641 < golang.org/x/text/transform
642 < golang.org/x/text/unicode/norm
643 < golang.org/x/text/unicode/bidi
644 < golang.org/x/text/secure/bidirule
645 < golang.org/x/net/idna
646 < golang.org/x/net/http/httpguts, golang.org/x/net/http/httpproxy;
647
648 NET, crypto/tls
649 < net/http/httptrace;
650
651 compress/gzip,
652 golang.org/x/net/http/httpguts,
653 golang.org/x/net/http/httpproxy,
654 golang.org/x/net/http2/hpack,
655 net/http/internal,
656 net/http/internal/ascii,
657 net/http/internal/testcert,
658 net/http/httptrace,
659 mime/multipart,
660 log
661 < net/http/internal/httpcommon, net/http/internal/httpsfv
662 < net/http;
663
664 # HTTP-aware packages
665
666 encoding/json, net/http
667 < expvar;
668
669 net/http, net/http/internal/ascii
670 < net/http/cookiejar, net/http/httputil;
671
672 net/http, flag
673 < net/http/httptest;
674
675 net/http, regexp
676 < net/http/cgi
677 < net/http/fcgi;
678
679 # Profiling
680 internal/runtime/pprof/label, runtime, context < internal/runtime/pprof;
681 FMT, compress/gzip, encoding/binary, sort, text/tabwriter, internal/runtime/pprof, internal/runtime/pprof/label
682 < runtime/pprof;
683
684 OS, compress/gzip, internal/lazyregexp
685 < internal/profile;
686
687 html, internal/profile, net/http, runtime/pprof, runtime/trace
688 < net/http/pprof;
689
690 # RPC
691 encoding/gob, encoding/json, go/token, html/template, net/http
692 < net/rpc
693 < net/rpc/jsonrpc;
694
695 # System Information
696 bufio, bytes, internal/cpu, io, os, strings, sync
697 < internal/sysinfo;
698
699 # Test-only
700 log
701 < testing/iotest
702 < testing/fstest;
703
704 FMT, flag, math/rand
705 < testing/quick;
706
707 FMT, DEBUG, flag, runtime/trace, internal/sysinfo, math/rand
708 < testing;
709
710 testing, math
711 < simd/archsimd/internal/test_helpers;
712
713 log/slog, testing
714 < testing/slogtest;
715
716 testing, crypto/rand
717 < testing/cryptotest;
718
719 FMT, crypto/sha256, encoding/binary, encoding/json,
720 go/ast, go/parser, go/token,
721 internal/godebug, math/rand, encoding/hex
722 < internal/fuzz;
723
724 OS, flag, testing, internal/cfg, internal/platform, internal/goroot
725 < internal/testenv;
726
727 OS, encoding/base64
728 < internal/obscuretestdata;
729
730 CGO, OS, fmt
731 < internal/testpty;
732
733 NET, testing, math/rand
734 < golang.org/x/net/nettest;
735
736 syscall
737 < os/exec/internal/fdtest;
738
739 FMT, sort
740 < internal/diff;
741
742 FMT
743 < internal/txtar;
744
745 internal/synctest, testing
746 < testing/synctest;
747
748 testing
749 < internal/testhash;
750
751 CRYPTO-MATH
752 < crypto/mlkem/mlkemtest;
753
754 CRYPTO-MATH, testing, internal/testenv, internal/testhash, encoding/json
755 < crypto/internal/cryptotest;
756
757 CGO, FMT
758 < crypto/internal/sysrand/internal/seccomp;
759
760 FIPS
761 < crypto/internal/fips140/check/checktest;
762
763 # v2 execution trace parser.
764 FMT, io, internal/trace/tracev2
765 < internal/trace/version;
766
767 FMT, encoding/binary, internal/trace/version
768 < internal/trace/raw;
769
770 FMT, internal/trace/version, io, sort, encoding/binary
771 < internal/trace/internal/tracev1;
772
773 FMT, encoding/binary, internal/trace/version, internal/trace/internal/tracev1, container/heap, math/rand, regexp
774 < internal/trace;
775
776 # cmd/trace dependencies.
777 FMT,
778 embed,
779 encoding/json,
780 html/template,
781 internal/profile,
782 internal/trace,
783 internal/trace/traceviewer/format,
784 net/http
785 < internal/trace/traceviewer;
786
787 # Coverage.
788 FMT, hash/fnv, encoding/binary, regexp, sort, text/tabwriter,
789 internal/coverage, internal/coverage/uleb128
790 < internal/coverage/cmerge,
791 internal/coverage/pods,
792 internal/coverage/slicereader,
793 internal/coverage/slicewriter;
794
795 internal/coverage/slicereader, internal/coverage/slicewriter
796 < internal/coverage/stringtab
797 < internal/coverage/decodecounter, internal/coverage/decodemeta,
798 internal/coverage/encodecounter, internal/coverage/encodemeta;
799
800 internal/coverage/cmerge
801 < internal/coverage/cformat;
802
803 internal/coverage, crypto/sha256, FMT
804 < cmd/internal/cov/covcmd;
805
806 encoding/json,
807 runtime/debug,
808 internal/coverage/calloc,
809 internal/coverage/cformat,
810 internal/coverage/decodecounter, internal/coverage/decodemeta,
811 internal/coverage/encodecounter, internal/coverage/encodemeta,
812 internal/coverage/pods
813 < internal/coverage/cfile
814 < runtime/coverage;
815
816 internal/coverage/cfile, internal/fuzz, internal/testlog, runtime/pprof, regexp
817 < testing/internal/testdeps;
818
819 # Test-only packages can have anything they want
820
821 FMT, compress/gzip, embed, encoding/binary
822 < encoding/json/internal/jsontest;
823
824 CGO, internal/syscall/unix
825 < net/internal/cgotest;
826
827 FMT, testing
828 < internal/cgrouptest;
829
830 regexp, internal/testenv, internal/trace, internal/trace/raw, internal/txtar, testing
831 < internal/trace/testtrace;
832
833 C, CGO
834 < internal/runtime/cgobench;
835
836 # Generate-only packages can have anything they want.
837
838 container/heap,
839 encoding/binary,
840 fmt,
841 hash/maphash,
842 io,
843 log,
844 math/bits,
845 os,
846 reflect,
847 strings,
848 sync
849 < internal/runtime/gc/internal/gen;
850
851 regexp, internal/txtar, internal/trace, internal/trace/raw
852 < internal/trace/internal/testgen;
853
854 FMT
855 < math/big/internal/asmgen;
856 `
857
858
859 func listStdPkgs(goroot string) ([]string, error) {
860
861 var pkgs []string
862
863 src := filepath.Join(goroot, "src") + string(filepath.Separator)
864 walkFn := func(path string, d fs.DirEntry, err error) error {
865 if err != nil || !d.IsDir() || path == src {
866 return nil
867 }
868
869 base := filepath.Base(path)
870 if strings.HasPrefix(base, ".") || strings.HasPrefix(base, "_") || base == "testdata" {
871 return filepath.SkipDir
872 }
873
874 name := filepath.ToSlash(path[len(src):])
875 if name == "builtin" || name == "cmd" {
876 return filepath.SkipDir
877 }
878
879 pkgs = append(pkgs, strings.TrimPrefix(name, "vendor/"))
880 return nil
881 }
882 if err := filepath.WalkDir(src, walkFn); err != nil {
883 return nil, err
884 }
885 return pkgs, nil
886 }
887
888 func TestDependencies(t *testing.T) {
889 testenv.MustHaveSource(t)
890
891 ctxt := Default
892 all, err := listStdPkgs(ctxt.GOROOT)
893 if err != nil {
894 t.Fatal(err)
895 }
896 slices.Sort(all)
897
898 sawImport := map[string]map[string]bool{}
899 policy := depsPolicy(t)
900
901 for _, pkg := range all {
902 imports, err := findImports(pkg)
903 if err != nil {
904 t.Error(err)
905 continue
906 }
907 if sawImport[pkg] == nil {
908 sawImport[pkg] = map[string]bool{}
909 }
910 var bad []string
911 for _, imp := range imports {
912 sawImport[pkg][imp] = true
913 if !policy.HasEdge(pkg, imp) {
914 bad = append(bad, imp)
915 }
916 }
917 if bad != nil {
918 t.Errorf("unexpected dependency: %s imports %v", pkg, bad)
919 }
920 }
921 }
922
923 var buildIgnore = []byte("\n//go:build ignore")
924
925 func findImports(pkg string) ([]string, error) {
926 vpkg := pkg
927 if strings.HasPrefix(pkg, "golang.org") {
928 vpkg = "vendor/" + pkg
929 }
930 dir := filepath.Join(Default.GOROOT, "src", vpkg)
931 files, err := os.ReadDir(dir)
932 if err != nil {
933 return nil, err
934 }
935 var imports []string
936 var haveImport = map[string]bool{}
937 if pkg == "crypto/internal/boring" {
938 haveImport["C"] = true
939 }
940 fset := token.NewFileSet()
941 for _, file := range files {
942 name := file.Name()
943 if name == "slice_go14.go" || name == "slice_go18.go" {
944
945 continue
946 }
947 if !strings.HasSuffix(name, ".go") || strings.HasSuffix(name, "_test.go") {
948 continue
949 }
950 info := fileInfo{
951 name: filepath.Join(dir, name),
952 fset: fset,
953 }
954 f, err := os.Open(info.name)
955 if err != nil {
956 return nil, err
957 }
958 err = readGoInfo(f, &info)
959 f.Close()
960 if err != nil {
961 return nil, fmt.Errorf("reading %v: %v", name, err)
962 }
963 if info.parsed.Name.Name == "main" {
964 continue
965 }
966 if bytes.Contains(info.header, buildIgnore) {
967 continue
968 }
969 for _, imp := range info.imports {
970 path := imp.path
971 if !haveImport[path] {
972 haveImport[path] = true
973 imports = append(imports, path)
974 }
975 }
976 }
977 slices.Sort(imports)
978 return imports, nil
979 }
980
981
982 func depsPolicy(t *testing.T) *dag.Graph {
983 g, err := dag.Parse(depsRules)
984 if err != nil {
985 t.Fatal(err)
986 }
987 return g
988 }
989
990
991
992 func TestStdlibLowercase(t *testing.T) {
993 testenv.MustHaveSource(t)
994
995 ctxt := Default
996 all, err := listStdPkgs(ctxt.GOROOT)
997 if err != nil {
998 t.Fatal(err)
999 }
1000
1001 for _, pkgname := range all {
1002 if strings.ToLower(pkgname) != pkgname {
1003 t.Errorf("package %q should not use upper-case path", pkgname)
1004 }
1005 }
1006 }
1007
1008
1009 func TestFindImports(t *testing.T) {
1010 imports, err := findImports("go/build")
1011 if err != nil {
1012 t.Fatal(err)
1013 }
1014 t.Logf("go/build imports %q", imports)
1015 want := []string{"bytes", "os", "path/filepath", "strings"}
1016 wantLoop:
1017 for _, w := range want {
1018 for _, imp := range imports {
1019 if imp == w {
1020 continue wantLoop
1021 }
1022 }
1023 t.Errorf("expected to find %q in import list", w)
1024 }
1025 }
1026
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