Golang project dependency management tool go vendor, go Mod

We're doing golang When programming a project , Generally, we will face more complicated golang The problem of dependence , Can pass go vendor perhaps go mod To solve

If go get error , Make the following settings on the command line ：

go env -w GOPROXY=https://goproxy.cn,direct

First download govendor：

go get github.com/kardianos/govendor

After downloading , Go to the project root , Perform initialization ：

govendor init

govendor Common commands

command	describe
init	Initial change vendor Catalog
list	List all the dependent packages of the project
add	Add package to vendor Under the table of contents
update	to update GOPATH Dependency package to vendor Catalog
remove	from vendor Delete dependent packages in
status	List the status of all packages ： defect 、 Expired or changed packages
fetch	Add or update packages to local vendor Catalog
sync	according to vendor.json To update dependent packages
get	similar go get, Pull the dependency package to vendor Under the table of contents

have access to govendor fetch Pull the source code directly ：

govendor fetch github.com/go-gorm/gorm/

---

go mod Must be go 1.11 Version and above

Set it first ：

go env -w GOBIN=/Users/youdi/go/bin
go env -w GO111MODULE=on
go env -w GOPROXY=https://goproxy.cn,direct //  Use seven cow cloud 

go mod command

command	explain
download	download modules to local cache( Download dependency package )
edit	edit go.mod from tools or scripts（ edit go.mod)
graph	print module requirement graph ( Print module dependency graph )
verify	initialize new module in current directory（ Initialize... In the current directory mod）
tidy	add missing and remove unused modules( Pull the missing module , Remove unused modules )
vendor	make vendored copy of dependencies( Copy dependency to vendor Next )
verify	verify dependencies have expected content ( Verify that the dependency is correct ）
why	explain why packages or modules are needed( Explain why you need to rely )

Initialize project ：

//  Go to the project root , perform ：
go mod init 
//  perhaps  go mod init  Project name 
```
 And then you can use `go get` Pull the package that you need to depend on , Will be automatically go.mod Generate records in 



- go mod download  Download module to local cache , The cache path is  $GOPATH/pkg/mod/cache
- go mod edit  Yes, it provides command edition editing  go.mod  The function of , for example  go mod edit -fmt go.mod  Can format  go.mod
- go mod graph  Show the dependency graph between modules 
- go mod init  Initialization module （ For example, the original dep Managed dependencies are transformed ）
- go mod tidy  Add missing packages , Remove useless packages 
- go mod vendor  Copy dependencies to  vendor/  Under the table of contents 
- go mod verify  Confirm dependencies 
- go mod why  Explain why packages and modules are needed 
 

 Generally, we can import other people's projects , Or modified go.mod After the document passed :
```
go mod tidy
```
 To initialize the dependencies of the latter refresh project 

 If you use goland To develop , Then you need to set go module and go proxy agent ：
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