golang 安装依赖

 go get -d -v ./...

以下载grpc为例

grpc官方提供的下载命令是：

go get google.golang.org/grpc

因为无法访问，所以我们需要在$GOPATH/src目录下面创建一个google.golang.org的目录。
在github上找到对应的grpc的包，https://github.com/grpc/grpc-go
其实google.golang.org对应的就是https://github.com/grpc/grpc-go
然后我们进入到$GOPATH/src/google.golang.org这个目录。执行git命令

git clone --depth=1 https://github.com/grpc/grpc-go.git grpc

命令解析：
其中--depth=1 这个参数的意思是只克隆最新的commit分支。不加也行。
最后的grpc表示的是将克隆的文件存放到那个文件夹里面。
执行完上面的命令，我们就成功的将grpc的包下载到本地了。

go get google.golang.org/grpc

golang当中go get其实执行了两个操作，一个是git clone 另外一个go install。所以我们还要进入到$GOPATH/src/google.golang.org/grpc当中执行以下go install 。这个命令会在$GOPATH/pkg/google.golang.org/grpc下面生成一个grpc.a的外部包文件。用于和其他程序访问和编译。并且在go install的过程当中我们可以检查哪些相关依赖的包没有安装，可以使用相同的办法进行安装。

如何自动下载所有依赖包？
大部分情况下大家下载 Go 项目都是使用go get命令，它除了会下载指定的项目代码，还会去下载这个项目所依赖的所有项目。

但是有的时候我们的项目由于各种原因并不是通过go get下载的，是通过git clone下载的，这样代码下下来就没有依赖包了，没办法编译通过的。这样的话怎么办呢？

 go get -d -v ./...
 

-d标志只下载代码包，不执行安装命令；
-v打印详细日志和调试日志。这里加上这个标志会把每个下载的包都打印出来；
./...这个表示路径，代表当前目录下所有的文件。

tips2

go: github.com/go-sql-driver/mysql@v1.5.0: Get "https://proxy.golang.org/github.com/go-sql-driver/mysql/@v/v1.5.0.mod": dial tcp 172.217.24.17:443: i/o timeout

root@cloud:~/tron-go# export GOPROXY=https://mirrors.aliyun.com/goproxy/
root@cloud:~/tro-go# make -j 48 
go: downloading golang.org/x/sys v0.0.0-20200625212154-ddb9806d33ae
go: downloading go.starlark.net v0.0.0-20200619143648-50ca820fafb9
go: downloading google.golang.org/genproto v0.0.0-20200626011028-ee7919e894b5
go: downloading golang.org/x/text v0.3.3

开启GO111MODULE
用环境变量 GO111MODULE 开启或关闭模块支持，它有三个可选值：off、on、auto，默认值是 auto。
GO111MODULE=off 无模块支持，go 会从 GOPATH 和 vendor 文件夹寻找包。
GO111MODULE=on 模块支持，go 会忽略 GOPATH 和 vendor 文件夹，只根据 go.mod 下载依赖。
GO111MODULE=auto 在 GOPATH/src/mod 中，也会把 go install 的结果放在 $GOPATH/bin 中。
go env -w GO111MODULE=on

/opt/gopath/pkg/mod/gvisor.dev/gvisor@v0.0.0-20201228220549-5c21c7c3bd15/pkg/coverage/coverage.go:35:2: cannot find module providing package github.com/bazelbuild/rules_go/go/tools/coverdata: module github.com/bazelbuild/rules_go/go/tools/coverdata: reading https://mirrors.aliyun.com/goproxy/github.com/bazelbuild/rules_go/go/tools/coverdata/@v/list: 404 Not Found
root@cloud:/gvisor# unset GOPROXY
root@cloud:/gvisor# go get gvisor.dev/gvisor/runsc@go
go get gvisor.dev/gvisor/runsc@go: gvisor.dev/gvisor/runsc@go: invalid version: Get "https://proxy.golang.org/gvisor.dev/gvisor/runsc/@v/go.info": dial tcp 216.58.200.241:443: i/o timeout
root@cloud:/gvisor# go get https://github.com/bazelbuild/rules_go.git
go get https:/github.com/bazelbuild/rules_go.git: malformed module path "https:/github.com/bazelbuild/rules_go.git": invalid char ':'
root@cloud:/gvisor# go get github.com/bazelbuild/rules_go

git clone

golang 安装依赖

root@cloud:/gvisor# export GOPROXY=https://mirrors.aliyun.com/goproxy/
root@cloud:/gvisor# go get gvisor.dev/gvisor/runsc@go
go: found gvisor.dev/gvisor/runsc in gvisor.dev/gvisor v0.0.0-20201228220549-5c21c7c3bd15
go: finding module for package github.com/bazelbuild/rules_go/go/tools/coverdata
go: downloading github.com/bazelbuild/rules_go v0.25.1
go: found github.com/bazelbuild/rules_go/go/tools/coverdata in github.com/bazelbuild/rules_go v0.25.1
# gvisor.dev/gvisor/pkg/sentry/platform/ring0/pagetables
/opt/gopath/pkg/mod/gvisor.dev/gvisor@v0.0.0-20201228220549-5c21c7c3bd15/pkg/sentry/platform/ring0/pagetables/walker_empty.go:121:14: pudEntry.SetSuper undefined (type *PTE has no field or method SetSuper)
/opt/gopath/pkg/mod/gvisor.dev/gvisor@v0.0.0-20201228220549-5c21c7c3bd15/pkg/sentry/platform/ring0/pagetables/walker_empty.go:132:22: pudEntry.IsSuper undefined (type *PTE has no field or method IsSuper)
/opt/gopath/pkg/mod/gvisor.dev/gvisor@v0.0.0-20201228220549-5c21c7c3bd15/pkg/sentry/platform/ring0/pagetables/walker_empty.go:138:24: pmdEntries[index].SetSuper undefined (type PTE has no field or method SetSuper)
/opt/gopath/pkg/mod/gvisor.dev/gvisor@v0.0.0-20201228220549-5c21c7c3bd15/pkg/sentry/platform/ring0/pagetables/walker_empty.go:175:15: pmdEntry.SetSuper undefined (type *PTE has no field or method SetSuper)
/opt/gopath/pkg/mod/gvisor.dev/gvisor@v0.0.0-20201228220549-5c21c7c3bd15/pkg/sentry/platform/ring0/pagetables/walker_empty.go:186:23: pmdEntry.IsSuper undefined (type *PTE has no field or method IsSuper)
/opt/gopath/pkg/mod/gvisor.dev/gvisor@v0.0.0-20201228220549-5c21c7c3bd15/pkg/sentry/platform/ring0/pagetables/walker_lookup.go:121:14: pudEntry.SetSuper undefined (type *PTE has no field or method SetSuper)
/opt/gopath/pkg/mod/gvisor.dev/gvisor@v0.0.0-20201228220549-5c21c7c3bd15/pkg/sentry/platform/ring0/pagetables/walker_lookup.go:132:22: pudEntry.IsSuper undefined (type *PTE has no field or method IsSuper)
/opt/gopath/pkg/mod/gvisor.dev/gvisor@v0.0.0-20201228220549-5c21c7c3bd15/pkg/sentry/platform/ring0/pagetables/walker_lookup.go:138:24: pmdEntries[index].SetSuper undefined (type PTE has no field or method SetSuper)
/opt/gopath/pkg/mod/gvisor.dev/gvisor@v0.0.0-20201228220549-5c21c7c3bd15/pkg/sentry/platform/ring0/pagetables/walker_lookup.go:175:15: pmdEntry.SetSuper undefined (type *PTE has no field or method SetSuper)
/opt/gopath/pkg/mod/gvisor.dev/gvisor@v0.0.0-20201228220549-5c21c7c3bd15/pkg/sentry/platform/ring0/pagetables/walker_lookup.go:186:23: pmdEntry.IsSuper undefined (type *PTE has no field or method IsSuper)
/opt/gopath/pkg/mod/gvisor.dev/gvisor@v0.0.0-20201228220549-5c21c7c3bd15/pkg/sentry/platform/ring0/pagetables/walker_lookup.go:186:23: too many errors
note: module requires Go 1.15
root@cloud:/gvisor#

note: module requires Go 1.15