cmd/go: why go get will add indirect dependency into go.mod

[Sherlock-Holo]

What version of Go are you using (go version)?

$ go version
go 1.13.3

Does this issue reproduce with the latest release?

yes

What operating system and processor architecture are you using (go env)?

go env Output

$ go env
GO111MODULE=""
GOARCH="amd64"
GOBIN=""
GOCACHE="/home/sherlock/.cache/go-build"
GOENV="/home/sherlock/.config/go/env"
GOEXE=""
GOFLAGS=""
GOHOSTARCH="amd64"
GOHOSTOS="linux"
GONOPROXY=""
GONOSUMDB=""
GOOS="linux"
GOPATH="/home/sherlock/go"
GOPRIVATE=""
GOPROXY="https://goproxy.cn,direct"
GOROOT="/usr/lib/go"
GOSUMDB="sum.golang.org"
GOTMPDIR=""
GOTOOLDIR="/usr/lib/go/pkg/tool/linux_amd64"
GCCGO="gccgo"
AR="ar"
CC="gcc"
CXX="g++"
CGO_ENABLED="1"
GOMOD="/home/sherlock/git/tfs/go.mod"
CGO_CFLAGS="-g -O2"
CGO_CPPFLAGS=""
CGO_CXXFLAGS="-g -O2"
CGO_FFLAGS="-g -O2"
CGO_LDFLAGS="-g -O2"
PKG_CONFIG="pkg-config"
GOGCCFLAGS="-fPIC -m64 -pthread -fmessage-length=0 -fdebug-prefix-map=/tmp/go-build601688037=/tmp/go-build -gno-record-gcc-switches"

What did you do?

My go.mod file content has some indirect dependencies, like

github.com/spf13/pflag v1.0.5 // indirect
golang.org/x/net v0.0.0-20190921015927-1a5e07d1ff72 // indirect
golang.org/x/sys v0.0.0-20191002091554-b397fe3ad8ed // indirect
golang.org/x/text v0.3.2 // indirect
google.golang.org/genproto v0.0.0-20190916214212-f660b8655731 // indirect

I delete them and then run go mod tidy

What did you expect to see?

What did you see instead?

go doesn't add them back and delete them from go.sum

So it confuses me: if go mod tidy doesn't add them back, and go build successfully, why I run go get -v github.com/something/something will add something indirect dependencies

[bcmills]

This issue seems to be a question about how to use Go, rather than a feature request or defect report about the Go language and/or toolchain.

We have decided that our experiment to allow questions on the issue tracker has not had the outcome we desired, so I am closing this issue. I'm sorry that we can't answer your question here.

There are many other methods to get help if you're still looking for answers:

• The golang-nuts mailing list.

• Stack Overflow, with questions tagged go.

• The Go Forum, a web-based forum hosted by GoBridge.

• The Gophers Slack hosted by GopherAcademy; use the invite app for access.
  The #general channel is a good starting point.

• Go Community on Hashnode with questions and posts tagged with "go"

• IRC channel #go-nuts on Freenode

Thanks