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# Make sure that -diff behaves the same as tidy.
31[exec:patch] cp go.mod.orig go.mod
32[exec:patch] ! exists go.sum
33[exec:patch] ! go mod tidy -diff
34[exec:patch] ! stdout .
35[exec:patch] 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'
36[exec:patch] 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'
37
38
39# If we run 'go mod tidy -e', we should still save enough checksums to run
40# 'go list -m all' reproducibly with go 1.16, even though we can't list
41# the specific package.
42
43go mod tidy -e
44! stderr '\n\tgo mod tidy'
45cmp go.mod go.mod.orig
46
47# Make sure that -diff behaves the same as tidy.
48[exec:patch] mv go.mod go.mod.tidyResult
49[exec:patch] mv go.sum go.sum.tidyResult
50[exec:patch] cp go.mod.orig go.mod
51[exec:patch] ! go mod tidy -e -diff
52[exec:patch] ! stderr '\n\tgo mod tidy'
53[exec:patch] cp stdout diff.patch
54[exec:patch] exec patch -p1 -i diff.patch
55[exec:patch] go mod tidy -e -diff
56[exec:patch] ! stdout .
57[exec:patch] cmp go.mod go.mod.tidyResult
58[exec:patch] cmp go.sum go.sum.tidyResult
59
60go list -m all
61cmp stdout all-m.txt
62
63go list -f $MODFMT example.net/ambiguous/nested/pkg
64stdout '^example.net/ambiguous/nested v0\.1\.0$'
65! stderr .
66
67go mod edit -go=1.16
68go list -m all
69cmp stdout all-m.txt
70
71! go list -f $MODFMT example.net/ambiguous/nested/pkg
72stderr '^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'
73
74
75# On the other hand, if we use -compat=1.17, 1.16 can't even load
76# the build list (due to missing checksums).
77
78cp go.mod.orig go.mod
79go mod tidy -compat=1.17
80! stderr .
81go list -m all
82cmp stdout all-m.txt
83
84# Make sure that -diff behaves the same as tidy.
85[exec:patch] mv go.mod go.mod.tidyResult
86[exec:patch] mv go.sum go.sum.tidyResult
87[exec:patch] cp go.mod.orig go.mod
88[exec:patch] ! go mod tidy -compat=1.17 -diff
89[exec:patch] ! stderr .
90[exec:patch] cp stdout diff.patch
91[exec:patch] exec patch -p1 -i diff.patch
92[exec:patch] go mod tidy -compat=1.17 -diff
93[exec:patch] ! stdout .
94[exec:patch] cmp go.mod go.mod.tidyResult
95[exec:patch] cmp go.sum go.sum.tidyResult
96
97go mod edit -go=1.16
98! go list -m all
99stderr '^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'
100
101
102-- go.mod --
103module example.com/m
104
105go 1.17
106
107replace example.net/indirect v0.1.0 => ./indirect
108
109require example.net/indirect v0.1.0
110
111require example.net/ambiguous/nested v0.1.0 // indirect
112-- all-m.txt --
113example.com/m
114example.net/ambiguous v0.1.0
115example.net/ambiguous/nested v0.1.0
116example.net/indirect v0.1.0 => ./indirect
117-- m.go --
118package m
119
120import _ "example.net/indirect"
121
122-- indirect/go.mod --
123module example.net/indirect
124
125go 1.17
126
127require example.net/ambiguous v0.1.0
128-- indirect/indirect.go --
129package indirect
130
131import _ "example.net/ambiguous/nested/pkg"
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