➜  tools go get -u github.com/spf13/cobra/cobra@v1.0.0
go: finding github.com/spf13/cobra/cobra v1.0.0
go: finding github.com/tmc/grpc-websocket-proxy latest
go: finding github.com/armon/consul-api latest
go: finding gopkg.in/check.v1 latest
go: finding github.com/golang/groupcache latest
go: finding golang.org/x/lint latest
go: finding golang.org/x/time latest
go: finding github.com/golang/glog latest
go: finding github.com/xiang90/probing latest
go: finding golang.org/x/net latest
go: finding github.com/coreos/go-systemd latest
go: finding golang.org/x/sync latest
go: finding golang.org/x/oauth2 latest
go: github.com/coreos/bbolt@v1.3.5: parsing go.mod: unexpected module path "go.etcd.io/bbolt"
go: github.com/coreos/go-systemd@v0.0.0-20200630094324-1ac580e0cdfa: go.mod has post-v0 module path "github.com/coreos/go-systemd/v22" at revision 1ac580e0cdfa
go: finding golang.org/x/crypto latest
go get: error loading module requirements
➜  tools
➜  tools go env
GOARCH="amd64"
GOBIN=""
GOCACHE="/Users/jiekunzhu/Library/Caches/go-build"
GOEXE=""
GOFLAGS=""
GOHOSTARCH="amd64"
GOHOSTOS="darwin"
GOOS="darwin"
GOPATH="/Users/jiekunzhu/vhost/go/"
GOPROXY=""
GORACE=""
GOROOT="/usr/local/Cellar/go@1.12/1.12.17/libexec"
GOTMPDIR=""
GOTOOLDIR="/usr/local/Cellar/go@1.12/1.12.17/libexec/pkg/tool/darwin_amd64"
GCCGO="gccgo"
CC="clang"
CXX="clang++"
CGO_ENABLED="1"
GOMOD="/Users/jiekunzhu/tools/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 -fno-caret-diagnostics -Qunused-arguments -fmessage-length=0 -fdebug-prefix-map=/var/folders/hv/xnsdqzkn28d32f7t1qpph_7w0000gp/T/go-build217942708=/tmp/go-build -gno-record-gcc-switches -fno-common"