src/cmd/go/testdata/script/mod_download.txt

env GO111MODULE=on

# download with version should print nothing.
# It should not load retractions from the .mod file from the latest version.
go mod download rsc.io/quote@v1.5.0
! stdout .
! stderr .
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
! exists $GOPATH/pkg/mod/cache/download/rsc.io/quote/@v/v1.5.2.info
! exists $GOPATH/pkg/mod/cache/download/rsc.io/quote/@v/v1.5.2.mod

# download of an invalid path should report the error
[short] skip
! go mod download this.domain.is.invalid/somemodule@v1.0.0
stderr 'this.domain.is.invalid'
! go mod download -json this.domain.is.invalid/somemodule@v1.0.0
stdout '"Error": ".*this.domain.is.invalid.*"'

# download -json with version should print JSON
go mod download -json 'rsc.io/quote@<=v1.5.0'
stdout '^\t"Path": "rsc.io/quote"'
stdout '^\t"Version": "v1.5.0"'
stdout '^\t"Info": ".*(\\\\|/)pkg(\\\\|/)mod(\\\\|/)cache(\\\\|/)download(\\\\|/)rsc.io(\\\\|/)quote(\\\\|/)@v(\\\\|/)v1.5.0.info"'
stdout '^\t"GoMod": ".*(\\\\|/)pkg(\\\\|/)mod(\\\\|/)cache(\\\\|/)download(\\\\|/)rsc.io(\\\\|/)quote(\\\\|/)@v(\\\\|/)v1.5.0.mod"'
stdout '^\t"Zip": ".*(\\\\|/)pkg(\\\\|/)mod(\\\\|/)cache(\\\\|/)download(\\\\|/)rsc.io(\\\\|/)quote(\\\\|/)@v(\\\\|/)v1.5.0.zip"'
stdout '^\t"Sum": "h1:6fJa6E\+wGadANKkUMlZ0DhXFpoKlslOQDCo259XtdIE="'  # hash of testdata/mod version, not real version!
stdout '^\t"GoModSum": "h1:LzX7hefJvL54yjefDEDHNONDjII0t9xZLPXsUe\+TKr0="'
! stdout '"Error"'

# download queries above should not have added to go.mod.
go list -m all
! stdout rsc.io

# download query should have downloaded go.mod for the highest release version
# in order to find retractions when resolving the query '@<=v1.5.0'.
exists $GOPATH/pkg/mod/cache/download/rsc.io/quote/@v/v1.5.2.info
exists $GOPATH/pkg/mod/cache/download/rsc.io/quote/@v/v1.5.2.mod
! exists $GOPATH/pkg/mod/cache/download/rsc.io/quote/@v/v1.5.2.zip

# add to go.mod so we can test non-query downloads
go mod edit -require rsc.io/quote@v1.5.3-pre1
! exists $GOPATH/pkg/mod/cache/download/rsc.io/quote/@v/v1.5.3-pre1.info
! exists $GOPATH/pkg/mod/cache/download/rsc.io/quote/@v/v1.5.3-pre1.mod
! exists $GOPATH/pkg/mod/cache/download/rsc.io/quote/@v/v1.5.3-pre1.zip

# module loading will page in the info and mod files
go list -m -mod=mod all
exists $GOPATH/pkg/mod/cache/download/rsc.io/quote/@v/v1.5.3-pre1.info
exists $GOPATH/pkg/mod/cache/download/rsc.io/quote/@v/v1.5.3-pre1.mod
! exists $GOPATH/pkg/mod/cache/download/rsc.io/quote/@v/v1.5.3-pre1.zip

# download will fetch and unpack the zip file
go mod download
exists $GOPATH/pkg/mod/cache/download/rsc.io/quote/@v/v1.5.3-pre1.info
exists $GOPATH/pkg/mod/cache/download/rsc.io/quote/@v/v1.5.3-pre1.mod
exists $GOPATH/pkg/mod/cache/download/rsc.io/quote/@v/v1.5.3-pre1.zip
exists $GOPATH/pkg/mod/rsc.io/quote@v1.5.3-pre1

# download repopulates deleted files and directories independently.
rm $GOPATH/pkg/mod/cache/download/rsc.io/quote/@v/v1.5.3-pre1.info
go mod download
exists $GOPATH/pkg/mod/cache/download/rsc.io/quote/@v/v1.5.3-pre1.info
rm $GOPATH/pkg/mod/cache/download/rsc.io/quote/@v/v1.5.3-pre1.mod
go mod download
exists $GOPATH/pkg/mod/cache/download/rsc.io/quote/@v/v1.5.3-pre1.mod
rm $GOPATH/pkg/mod/cache/download/rsc.io/quote/@v/v1.5.3-pre1.zip
go mod download
exists $GOPATH/pkg/mod/cache/download/rsc.io/quote/@v/v1.5.3-pre1.zip
rm -r $GOPATH/pkg/mod/rsc.io/quote@v1.5.3-pre1
go mod download
exists $GOPATH/pkg/mod/rsc.io/quote@v1.5.3-pre1

# download reports the locations of downloaded files
go mod download -json
stdout '^\t"Path": "rsc.io/quote"'
stdout '^\t"Version": "v1.5.3-pre1"'
stdout '^\t"Info": ".*(\\\\|/)pkg(\\\\|/)mod(\\\\|/)cache(\\\\|/)download(\\\\|/)rsc.io(\\\\|/)quote(\\\\|/)@v(\\\\|/)v1.5.3-pre1.info"'
stdout '^\t"GoMod": ".*(\\\\|/)pkg(\\\\|/)mod(\\\\|/)cache(\\\\|/)download(\\\\|/)rsc.io(\\\\|/)quote(\\\\|/)@v(\\\\|/)v1.5.3-pre1.mod"'
stdout '^\t"Zip": ".*(\\\\|/)pkg(\\\\|/)mod(\\\\|/)cache(\\\\|/)download(\\\\|/)rsc.io(\\\\|/)quote(\\\\|/)@v(\\\\|/)v1.5.3-pre1.zip"'
stdout '^\t"Dir": ".*(\\\\|/)pkg(\\\\|/)mod(\\\\|/)rsc.io(\\\\|/)quote@v1.5.3-pre1"'

# download will follow replacements
go mod edit -require rsc.io/quote@v1.5.1 -replace rsc.io/quote@v1.5.1=rsc.io/quote@v1.5.2
go mod download
! exists $GOPATH/pkg/mod/cache/download/rsc.io/quote/@v/v1.5.1.zip
exists $GOPATH/pkg/mod/cache/download/rsc.io/quote/@v/v1.5.2.zip

# download will not follow replacements for explicit module queries
go mod download -json rsc.io/quote@v1.5.1
exists $GOPATH/pkg/mod/cache/download/rsc.io/quote/@v/v1.5.1.zip

# download reports errors encountered when locating modules
! go mod download bad/path
stderr '^module bad/path: not a known dependency$'
! go mod download bad/path@latest
stderr '^bad/path@latest: malformed module path "bad/path": missing dot in first path element$'
! go mod download rsc.io/quote@v1.999.999
stderr '^rsc.io/quote@v1.999.999: reading .*/v1.999.999.info: 404 Not Found$'
! go mod download -json bad/path
stdout '^\t"Error": "module bad/path: not a known dependency"'

# download main module returns an error
go mod download m
stderr '^go mod download: skipping argument m that resolves to the main module\n'
go mod download m@latest
stderr '^go mod download: skipping argument m@latest that resolves to the main module\n'

# allow go mod download without go.mod
env GO111MODULE=auto
rm go.mod
rm $GOPATH/pkg/mod/cache/download/rsc.io/quote/@v/v1.2.1.zip
go mod download rsc.io/quote@v1.2.1
exists $GOPATH/pkg/mod/cache/download/rsc.io/quote/@v/v1.2.1.zip

# download -x with version should print
# the underlying commands such as contacting GOPROXY.
go mod download -x rsc.io/quote@v1.0.0
! stdout .
stderr 'get '$GOPROXY

-- go.mod --
module m