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cmd/go: error out of 'go mod download' if the main module is passed as argument

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Test added.

Fixes #28338

Change-Id: Iab72ba5646360ae91671261161d8fda451f7a717
Reviewed-on: https://go-review.googlesource.com/c/go/+/189797
Run-TryBot: Bryan C. Mills <bcmills@google.com>
Reviewed-by: Bryan C. Mills <bcmills@google.com>
This commit is contained in:
Constantin Konstantinidis 2019-08-10 08:00:55 +02:00 committed by Bryan C. Mills
parent b3885dbc93
commit 696c41488a
2 changed files with 20 additions and 2 deletions
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16
src/cmd/go/internal/modcmd/download.go
View File

@ -81,6 +81,17 @@ func runDownload(cmd *base.Command, args []string) {
}
if len(args) == 0 {
args = []string{"all"}
} else if modload.HasModRoot() {
modload.InitMod() // to fill Target
targetAtLatest := modload.Target.Path + "@latest"
targetAtUpgrade := modload.Target.Path + "@upgrade"
targetAtPatch := modload.Target.Path + "@patch"
for _, arg := range args {
switch arg {
case modload.Target.Path, targetAtLatest, targetAtUpgrade, targetAtPatch:
os.Stderr.WriteString("go mod download: skipping argument "+ arg + " that resolves to the main module\n")
}
}
}
var mods []*moduleJSON
@ -91,8 +102,9 @@ func runDownload(cmd *base.Command, args []string) {
if info.Replace != nil {
info = info.Replace
}
if info.Version == "" && info.Error == nil {
// main module
if (module.Version{Path: info.Path, Version: info.Version} == modload.Target) {
// skipping main module.
// go mod download without dependencies is silent.
continue
}
m := &moduleJSON{

6
src/cmd/go/testdata/script/mod_download.txt vendored
View File

@ -93,6 +93,12 @@ 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