| # https://golang.org/issue/46141: 'go mod tidy' for a Go 1.17 module should by |
| # default preserve enough checksums for the module to be used by Go 1.16. |
| # |
| # We don't have a copy of Go 1.16 handy, but we can simulate it by editing the |
| # 'go' version in the go.mod file to 1.16, without actually updating the |
| # requirements to match. |
| |
| [short] skip |
| |
| env MODFMT='{{with .Module}}{{.Path}} {{.Version}}{{end}}' |
| |
| |
| # This module has the same module dependency graph in Go 1.16 as in Go 1.17, |
| # but in 1.16 requires (checksums for) additional (irrelevant) go.mod files. |
| # |
| # The module graph under both versions looks like: |
| # |
| # m ---- example.com/version v1.1.0 |
| # | |
| # + ---- example.net/lazy v0.1.0 ---- example.com/version v1.0.1 |
| # |
| # Go 1.17 avoids loading the go.mod file for example.com/version v1.0.1 |
| # (because it is lower than the version explicitly required by m, |
| # and the module that requires it — m — specifies 'go 1.17'). |
| # |
| # That go.mod file happens not to affect the final 1.16 module graph anyway, |
| # so the pruned graph is equivalent to the unpruned one. |
| |
| cp go.mod go.mod.orig |
| go mod tidy |
| cmp go.mod go.mod.orig |
| |
| go list -m all |
| cmp stdout m_all.txt |
| |
| go mod edit -go=1.16 |
| go list -m all |
| cmp stdout m_all.txt |
| |
| |
| # If we explicitly drop compatibility with 1.16, we retain fewer checksums, |
| # which gives a cleaner go.sum file but causes 1.16 to fail in readonly mode. |
| |
| cp go.mod.orig go.mod |
| go mod tidy -compat=1.17 |
| cmp go.mod go.mod.orig |
| |
| go list -m all |
| cmp stdout m_all.txt |
| |
| go mod edit -go=1.16 |
| ! go list -m all |
| stderr '^go: example.net/lazy@v0.1.0 requires\n\texample.com/version@v1.0.1: missing go.sum entry; to add it:\n\tgo mod download example.com/version$' |
| |
| |
| -- go.mod -- |
| // Module m happens to have the exact same build list as what would be |
| // selected under Go 1.16, but computes that build list without looking at |
| // as many go.mod files. |
| module example.com/m |
| |
| go 1.17 |
| |
| replace example.net/lazy v0.1.0 => ./lazy |
| |
| require ( |
| example.com/version v1.1.0 |
| example.net/lazy v0.1.0 |
| ) |
| -- m_all.txt -- |
| example.com/m |
| example.com/version v1.1.0 |
| example.net/lazy v0.1.0 => ./lazy |
| -- compatible.go -- |
| package compatible |
| |
| import ( |
| _ "example.com/version" |
| _ "example.net/lazy" |
| ) |
| -- lazy/go.mod -- |
| // Module lazy requires example.com/version v1.0.1. |
| // |
| // However, since this module is lazy, its dependents |
| // should not need checksums for that version of the module |
| // unless they actually import packages from it. |
| module example.net/lazy |
| |
| go 1.17 |
| |
| require example.com/version v1.0.1 |
| -- lazy/lazy.go -- |
| package lazy |
| |
| import _ "example.com/version" |