Ubuntu-16.04 fabric cannot stat 'build/docker/gotools/bin/protoc-gen-go'

export GOROOT=/usr/local/go

#使用如下步骤:
# 1. 安装 gopm
export GOPATH=/opt/go/ # global settings: export GOPATH=/usr/local
go get -u github.com/gpmgo/gopm
#确认在$GOPATH/bin 目录下有 gopm
# 2. 通过 gopm 安装 goimports
export GOPATH=/opt/go/
gopm get -g -d golang.org/x/tools/cmd/goimports
#再使用 go install 安装 goimports
go install golang.org/x/tools/cmd/goimports
#确认在$GOPATH/bin 目录下有 goimports

GOPATH=/opt/go
gopm get -g -d golang.org/x/tools/cover
gopm get -g -d github.com/axw/gocov/gocov
go install github.com/axw/gocov/gocov
# 确认 $GOPATH/bin 目录下有 gocov

export GOPATH=/opt/go
gopm get -g -d github.com/AlekSi/gocov-xml
go install github.com/AlekSi/gocov-xml
#确认 $GOPATH/bin 目录下有 gocov-xml

#编译生成 protoc-gen-go
cd $GOPATH
gopm get -g -d github.com/golang/protobuf/protoc-gen-go
go install github.com/golang/protobuf/protoc-gen-go
#确认在$GOPATH/bin出现protoc-gen-go执行文件

如果出现文件或者命令没找到的错误，复制go 的相关文件到 fabric 编译环境

cp $GOPATH/bin/protoc-gen-go $GOPATH/src/github.com/hyperledger/fabric/build/docker/gotools/bin/

cp $GOPATH/bin/gocov $GOPATH/src/github.com/hyperledger/fabric/build/docker/gotools/bin/