1 # https://golang.org/issue/46141: 'go mod tidy' for a Go 1.17 module should by
2 # default preserve enough checksums for the module to be used by Go 1.16.
3 #
4 # We don't have a copy of Go 1.16 handy, but we can simulate it by editing the
5 # 'go' version in the go.mod file to 1.16, without actually updating the
6 # requirements to match.
7
8 [short] skip
9
10 env MODFMT='{{with .Module}}{{.Path}} {{.Version}}{{end}}'
11
12 # For this module, the dependency providing package
13 # example.net/ambiguous/nested/pkg is unambiguous in Go 1.17 (because only one
14 # root of the module graph contains the package), whereas it is ambiguous in
15 # Go 1.16 (because two different modules contain plausible packages and Go 1.16
16 # does not privilege roots above other dependencies).
17 #
18 # However, the overall build list is identical for both versions.
19
20 cp go.mod go.mod.orig
21
22 ! go mod tidy
23
24 stderr '^go: example\.com/m imports\n\texample\.net/indirect imports\n\texample\.net/ambiguous/nested/pkg loaded from example\.net/ambiguous/nested@v0\.1\.0,\n\tbut go 1.16 would fail to locate it:\n\tambiguous import: found package example\.net/ambiguous/nested/pkg in multiple modules:\n\texample\.net/ambiguous v0.1.0 \(.*\)\n\texample\.net/ambiguous/nested v0.1.0 \(.*\)\n\n'
25
26 stderr '\n\nTo proceed despite packages unresolved in go 1\.16:\n\tgo mod tidy -e\nIf reproducibility with go 1.16 is not needed:\n\tgo mod tidy -compat=1\.17\nFor other options, see:\n\thttps://golang\.org/doc/modules/pruning\n'
27
28 cmp go.mod go.mod.orig
29
30
31 # If we run 'go mod tidy -e', we should still save enough checksums to run
32 # 'go list -m all' reproducibly with go 1.16, even though we can't list
33 # the specific package.
34
35 go mod tidy -e
36 ! stderr '\n\tgo mod tidy'
37 cmp go.mod go.mod.orig
38
39 go list -m all
40 cmp stdout all-m.txt
41
42 go list -f $MODFMT example.net/ambiguous/nested/pkg
43 stdout '^example.net/ambiguous/nested v0\.1\.0$'
44 ! stderr .
45
46 go mod edit -go=1.16
47 go list -m all
48 cmp stdout all-m.txt
49
50 ! go list -f $MODFMT example.net/ambiguous/nested/pkg
51 stderr '^ambiguous import: found package example\.net/ambiguous/nested/pkg in multiple modules:\n\texample\.net/ambiguous v0\.1\.0 \(.*\)\n\texample\.net/ambiguous/nested v0\.1\.0 \(.*\)\n'
52
53
54 # On the other hand, if we use -compat=1.17, 1.16 can't even load
55 # the build list (due to missing checksums).
56
57 cp go.mod.orig go.mod
58 go mod tidy -compat=1.17
59 ! stderr .
60 go list -m all
61 cmp stdout all-m.txt
62
63 go mod edit -go=1.16
64 ! go list -m all
65 stderr '^go: example\.net/indirect@v0\.1\.0 requires\n\texample\.net/ambiguous@v0\.1\.0: missing go\.sum entry for go\.mod file; to add it:\n\tgo mod download example\.net/ambiguous\n'
66
67
68 -- go.mod --
69 module example.com/m
70
71 go 1.17
72
73 replace example.net/indirect v0.1.0 => ./indirect
74
75 require example.net/indirect v0.1.0
76
77 require example.net/ambiguous/nested v0.1.0 // indirect
78 -- all-m.txt --
79 example.com/m
80 example.net/ambiguous v0.1.0
81 example.net/ambiguous/nested v0.1.0
82 example.net/indirect v0.1.0 => ./indirect
83 -- m.go --
84 package m
85
86 import _ "example.net/indirect"
87
88 -- indirect/go.mod --
89 module example.net/indirect
90
91 go 1.17
92
93 require example.net/ambiguous v0.1.0
94 -- indirect/indirect.go --
95 package indirect
96
97 import _ "example.net/ambiguous/nested/pkg"
98
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