# 'mod download' should download the module to the cache.
go mod download rsc.io/quote@v1.5.0
exists $GOPATH/pkg/mod/cache/download/rsc.io/quote/@v/v1.5.0.info
exists $GOPATH/pkg/mod/cache/download/rsc.io/quote/@v/v1.5.0.mod
exists $GOPATH/pkg/mod/cache/download/rsc.io/quote/@v/v1.5.0.zip

# '-n' should print commands but not actually execute them.
go clean -modcache -n
stdout '^rm -rf .*pkg.mod$'

go list all # all includes both modules
stdout 'example.com/a'
stdout 'example.com/b'

# -mod can only be set to readonly in workspace mode
go list -mod=readonly all
! go list -mod=mod all
stderr '^go: -mod may only be set to readonly or vendor when in workspace mode'
env GOWORK=off
go list -mod=mod all
env GOWORK=

# Test that duplicates in the use list return an error
cp go.work go.work.backup
cp go.work.dup go.work

go build -x -mod=mod my-module/vendor/example.com/another-module/foo/bar/baz.go
go build -x -mod=readonly my-module/vendor/example.com/another-module/foo/bar/baz.go
go build -x -mod=vendor my-module/vendor/example.com/another-module/foo/bar/baz.go

# baz_with_outside_dep.go (with a non-std dependency) works with -mod=mod
# but not with -mod=readonly and -mod=vendor.

# Test that mod=vendor is disabled in workspace mode, even
# with a single workspace module.

cd workspace

# Base case: ensure the module would default to mod=vendor
# outside of workspace mode.
env GOWORK=off
go list -f '{{.Dir}}' example.com/dep
stdout $GOPATH[\\/]src[\\/]workspace[\\/]vendor[\\/]example.com[\\/]dep

# Test case: endure the module does not enter mod=vendor outside
# worspace mode.
env GOWORK=''

go get -modcacherw
exists $GOPATH/pkg/mod/rsc.io/quote@v1.5.2/go.mod

# 'go mod verify' should fail if we delete a file.
go mod verify
rm $GOPATH/pkg/mod/rsc.io/quote@v1.5.2/go.mod
! go mod verify

# Create a .partial file to simulate an failure extracting the zip file.
cp empty $GOPATH/pkg/mod/cache/download/rsc.io/quote/@v/v1.5.2.partial

# 'go mod verify' should not fail, since the module hasn't been completely

cp go.mod.allreplaced go.mod
go list -m -u -f '{{.Path}}@{{.Version}} <{{.Deprecated}}>{{with .Replace}} => {{.Path}}@{{.Version}} <{{.Deprecated}}>{{end}}' all
stdout '^example.com/deprecated/a@v1.0.0 <> => example.com/deprecated/b@v1.0.0 <in example.com/deprecated/b@v1.9.0>$'

# When one version is replaced, we should see a deprecation message.
cp go.mod.onereplaced go.mod

# Regression test for https://go.dev/issue/60313: 'go mod tidy' did not preserve
# dependencies needed to prevent 'ambiguous import' errors in external test
# dependencies.

cp go.mod go.mod.orig
go mod tidy
cmp go.mod go.mod.orig

-- go.mod --
module example

go 1.21

require (
	example.net/a v0.1.0
	example.net/b v0.1.0
)

require example.net/outer/inner v0.1.0 // indirect

replace (
	example.net/a v0.1.0 => ./a

golang.org/x/net v0.25.0/go.mod h1:JkAGAh7GEvH74S6FOH42FLoXpXbE/aqXSrIQjXgsiwM=
golang.org/x/sys v0.5.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
golang.org/x/sys v0.20.0 h1:Od9JTbYCk261bKm4M/mw7AklTlFYIa0bIp9BgSm1S8Y=
golang.org/x/sys v0.20.0/go.mod h1:/VUhepiaJMQUp4+oa/7Zr1D23ma6VTLIYjOOTFZPUcA=
golang.org/x/text v0.15.0 h1:h1V/4gjBv8v9cjcR6+AR5+/cIYK5N/WAgiv4xlsEtAk=
golang.org/x/text v0.15.0/go.mod h1:18ZOQIKpY8NJVqYksKHtTdi31H5itFRjB5/qKTNYzSU=

cp go.exclude.mod go.exclude.mod.orig
! go get -modfile=go.exclude.mod rsc.io/quote@v1.5.0
stderr '^go: rsc.io/quote@v1.5.0: excluded by go.mod$'

# get non-excluded version
cp go.exclude.mod.orig go.exclude.mod
go get -modfile=go.exclude.mod rsc.io/quote@v1.5.1
stderr 'rsc.io/quote v1.5.1'

# get query with excluded version
cp go.exclude.mod.orig go.exclude.mod
go get -modfile=go.exclude.mod rsc.io/quote@>=v1.5

// workspace mode, or the workspace's directory in workspace mode.
func Replacement(mod module.Version) module.Version {
	r, foundModRoot, _ := replacementFrom(mod)
	return canonicalizeReplacePath(r, foundModRoot)
}

// replacementFrom returns the replacement for mod, if any, the modroot of the replacement if it appeared in a go.mod,