env GO111MODULE=on
[short] skip

# -mod=readonly must not resolve missing modules nor update go.mod
env GOFLAGS=-mod=readonly
go mod edit -fmt
cp go.mod go.mod.empty
! go list all
stderr '^x.go:2:8: cannot find module providing package rsc\.io/quote: import lookup disabled by -mod=readonly'
! stderr '\(\)' # If we don't have a reason for -mod=readonly, don't log an empty one.
cmp go.mod go.mod.empty

# -mod=readonly should be set by default.
env GOFLAGS=
! go list all
stderr '^x.go:2:8: no required module provides package rsc\.io/quote; to add it:\n\tgo get rsc\.io/quote$'
cmp go.mod go.mod.empty

env GOFLAGS=-mod=readonly

# update go.mod - go get allowed
go get rsc.io/quote
grep rsc.io/quote go.mod

# update go.mod - go mod tidy allowed
cp go.mod.empty go.mod
go mod tidy
cp go.mod go.mod.tidy

# -mod=readonly must succeed once go.mod is up-to-date...
go list all

# ... even if it needs downloads
go clean -modcache
go list all

# -mod=readonly must not cause 'go list -m' to fail.
# (golang.org/issue/36478)
go list -m all
! stderr 'cannot query module'

# -mod=readonly should reject inconsistent go.mod files
# (ones that would be rewritten).
go get rsc.io/sampler@v1.2.0
go mod edit -require rsc.io/quote@v1.5.2
cp go.mod go.mod.inconsistent
! go list
stderr 'go: updates to go.mod needed, disabled by -mod=readonly'
cmp go.mod go.mod.inconsistent

# We get a different message when -mod=readonly is used by default.
env GOFLAGS=
! go list
stderr '^go: updates to go.mod needed; to update it:\n\tgo mod tidy'

# However, it should not reject files missing a 'go' directive,
# since that was not always required.
cp go.mod.nogo go.mod
go list all
cmp go.mod go.mod.nogo

# Nor should it reject files with redundant (not incorrect)
# requirements.
cp go.mod.redundant go.mod
go list all
cmp go.mod go.mod.redundant

cp go.mod.indirect go.mod
go list all
cmp go.mod go.mod.indirect


# If we identify a missing package as a dependency of some other package in the
# main module, we should suggest 'go mod tidy' instead of resolving it.

cp go.mod.untidy go.mod
! go list all
stderr '^x.go:2:8: no required module provides package rsc.io/quote; to add it:\n\tgo get rsc.io/quote$'

! go list -deps .
stderr '^x.go:2:8: no required module provides package rsc.io/quote; to add it:\n\tgo get rsc.io/quote$'

# However, if we didn't see an import from the main module, we should suggest
# 'go get' instead, because we don't know whether 'go mod tidy' would add it.
! go list rsc.io/quote
stderr '^no required module provides package rsc.io/quote; to add it:\n\tgo get rsc.io/quote$'


-- go.mod --
module m

go 1.16

-- x.go --
package x
import _ "rsc.io/quote"
-- go.mod.nogo --
module m

require (
	rsc.io/quote v1.5.2
	rsc.io/testonly v1.0.0 // indirect
)
-- go.mod.redundant --
module m

go 1.16

require (
	rsc.io/quote v1.5.2
	rsc.io/sampler v1.3.0 // indirect
	rsc.io/testonly v1.0.0 // indirect
)
-- go.mod.indirect --
module m

go 1.16

require (
	rsc.io/quote v1.5.2 // indirect
	rsc.io/sampler v1.3.0 // indirect
	rsc.io/testonly v1.0.0 // indirect
)
-- go.mod.untidy --
module m

go 1.16

require (
	rsc.io/sampler v1.3.0 // indirect
)