mod_tidy_compat_irrelevant.txt

Documentation: cmd/go/testdata/script

     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
    13# This module selects the same versions in Go 1.16 and 1.17 for all modules
    14# that provide packages (or test dependencies of packages) imported by the
    15# main module. However, in Go 1.16 it selects a higher version of a
    16# transitive module dependency that is not otherwise relevant to the main module.
    17# As a result, Go 1.16 needs an additional checksum for the go.mod file of
    18# that irrelevant dependency.
    19#
    20# The Go 1.16 module graph looks like:
    21#
    22# m ---- lazy v0.1.0 ---- incompatible v1.0.0
    23#         |
    24#         + ------------- requireincompatible v0.1.0 ---- incompatible v2.0.0+incompatible
    25
    26cp go.mod go.mod.orig
    27go mod tidy
    28cmp go.mod go.mod.orig
    29
    30go list -deps -test -f $MODFMT all
    31cp stdout out-117.txt
    32
    33go mod edit -go=1.16
    34go list -deps -test -f $MODFMT all
    35cmp stdout out-117.txt
    36
    37
    38# If we explicitly drop compatibility with 1.16, we retain fewer checksums,
    39# which gives a cleaner go.sum file but causes 1.16 to fail in readonly mode.
    40
    41cp go.mod.orig go.mod
    42go mod tidy -compat=1.17
    43cmp go.mod go.mod.orig
    44
    45go list -deps -test -f $MODFMT all
    46cmp stdout out-117.txt
    47
    48go mod edit -go=1.16
    49! go list -deps -test -f $MODFMT all
    50stderr -count=1 '^go: example.net/lazy@v0.1.0 requires\n\texample.com/retract/incompatible@v1.0.0: missing go.sum entry for go.mod file; to add it:\n\tgo mod download example.com/retract/incompatible$'
    51
    52
    53-- go.mod --
    54// Module m imports packages from the same versions under Go 1.17
    55// as under Go 1.16, but under 1.16 its (implicit) external test dependencies
    56// are higher.
    57module example.com/m
    58
    59go 1.17
    60
    61replace (
    62	example.net/lazy v0.1.0 => ./lazy
    63	example.net/requireincompatible v0.1.0 => ./requireincompatible
    64)
    65
    66require example.net/lazy v0.1.0
    67-- m.go --
    68package m
    69
    70import _ "example.net/lazy"
    71-- lazy/go.mod --
    72// Module lazy requires example.com/retract/incompatible v1.0.0.
    73//
    74// When viewed from the outside it also has a transitive dependency
    75// on v2.0.0+incompatible, but in lazy mode that transitive dependency
    76// is pruned out.
    77module example.net/lazy
    78
    79go 1.17
    80
    81exclude example.com/retract/incompatible v2.0.0+incompatible
    82
    83require (
    84	example.com/retract/incompatible v1.0.0
    85	example.net/requireincompatible v0.1.0
    86)
    87-- lazy/lazy.go --
    88package lazy
    89-- lazy/unimported/unimported.go --
    90package unimported
    91
    92import _ "example.com/retract/incompatible"
    93-- requireincompatible/go.mod --
    94module example.net/requireincompatible
    95
    96go 1.15
    97
    98require example.com/retract/incompatible v2.0.0+incompatible
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