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
10env 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
20cp go.mod go.mod.orig
21
22! go mod tidy
23
24stderr '^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
26stderr '\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
28cmp 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
35go mod tidy -e
36! stderr '\n\tgo mod tidy'
37cmp go.mod go.mod.orig
38
39go list -m all
40cmp stdout all-m.txt
41
42go list -f $MODFMT example.net/ambiguous/nested/pkg
43stdout '^example.net/ambiguous/nested v0\.1\.0$'
44! stderr .
45
46go mod edit -go=1.16
47go list -m all
48cmp stdout all-m.txt
49
50! go list -f $MODFMT example.net/ambiguous/nested/pkg
51stderr '^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
57cp go.mod.orig go.mod
58go mod tidy -compat=1.17
59! stderr .
60go list -m all
61cmp stdout all-m.txt
62
63go mod edit -go=1.16
64! go list -m all
65stderr '^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 --
69module example.com/m
70
71go 1.17
72
73replace example.net/indirect v0.1.0 => ./indirect
74
75require example.net/indirect v0.1.0
76
77require example.net/ambiguous/nested v0.1.0 // indirect
78-- all-m.txt --
79example.com/m
80example.net/ambiguous v0.1.0
81example.net/ambiguous/nested v0.1.0
82example.net/indirect v0.1.0 => ./indirect
83-- m.go --
84package m
85
86import _ "example.net/indirect"
87
88-- indirect/go.mod --
89module example.net/indirect
90
91go 1.17
92
93require example.net/ambiguous v0.1.0
94-- indirect/indirect.go --
95package indirect
96
97import _ "example.net/ambiguous/nested/pkg"
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