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cmd/go: enable -x in go mod download

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Lack of logging hinders debugging. Like many other go commands,
let's allow users to inspect what is going on underneath.

Example:

$ GO111MODULE=on GOPROXY=direct GOPATH=`mktemp -d` go mod download -x golang.org/x/tools/gopls@latest
mkdir -p /var/folders/bw/6r6k9d113sv1_vvzk_1kfxbm001py5/T/tmp.ykhTiXaS/pkg/mod/cache/vcs # git3 https://go.googlesource.com/tools
...

Update #35849

Change-Id: I5577e683ae3c0145b11822df255b210ad9f60c87
Reviewed-on: https://go-review.googlesource.com/c/go/+/208558
Run-TryBot: Hyang-Ah Hana Kim <hyangah@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Russ Cox <rsc@golang.org>
This commit is contained in:
Hana (Hyang-Ah) Kim 2019-11-23 12:06:21 -05:00 committed by Hyang-Ah Hana Kim
parent b11d02ef74
commit f1c8e2c14a
3 changed files with 15 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
src/cmd/go/alldocs.go
View File

@ -1010,7 +1010,7 @@
//
// Usage:
//
// go mod download [-json] [modules]
// go mod download [-x] [-json] [modules]
//
// Download downloads the named modules, which can be module patterns selecting
// dependencies of the main module or module queries of the form path@version.
@ -1037,6 +1037,8 @@
// GoModSum string // checksum for go.mod (as in go.sum)
// }
//
// The -x flag causes download to print the commands download executes.
//
// See 'go help modules' for more about module queries.
//
//

6
src/cmd/go/internal/modcmd/download.go
View File

@ -19,7 +19,7 @@ import (
)
var cmdDownload = &base.Command{
UsageLine: "go mod download [-json] [modules]",
UsageLine: "go mod download [-x] [-json] [modules]",
Short: "download modules to local cache",
Long: `
Download downloads the named modules, which can be module patterns selecting
@ -47,6 +47,8 @@ corresponding to this Go struct:
GoModSum string // checksum for go.mod (as in go.sum)
}
The -x flag causes download to print the commands download executes.
See 'go help modules' for more about module queries.
`,
}
@ -56,6 +58,8 @@ var downloadJSON = cmdDownload.Flag.Bool("json", false, "")
func init() {
cmdDownload.Run = runDownload // break init cycle
// TODO(jayconrod): https://golang.org/issue/35849 Apply -x to other 'go mod' commands.
cmdDownload.Flag.BoolVar(&cfg.BuildX, "x", false, "")
work.AddModCommonFlags(cmdDownload)
}

7
src/cmd/go/testdata/script/mod_download.txt vendored
View File

@ -4,6 +4,7 @@ env GOPROXY=$GOPROXY/quiet
# download with version should print nothing
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
@ -106,5 +107,11 @@ 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