go语言引入本地依赖包

在go语言项目中，引入本地包很常见，举个例子。

postgres_exporter 引入本地的pq。下载和运行postgres_exporter，还需要安装go语言

下载postgres数据使用驱动：git clone git@github.com:lib/pq.git

package main

import (
...
        "github.com/lib/pq"
...

查看源码位置

[root@baidu1 postgres_exporter]# pwd
/gopath/postgres_exporter
[root@baidu1 pq]# pwd
/src/pq

使用 replace 将远程包替换为本地包服务

[root@baidu1 postgres_exporter]# vi go.mod 

replace github.com/lib/pq => /src/pq

打包，应用

[root@segment1 postgres_exporter]# make build
>> building binaries
GO111MODULE=on /root/go/bin/promu build --prefix /home/wangdp/postgres_exporter 
 >   postgres_exporter
go: downloading github.com/blang/semver v3.5.1+incompatible
go: downloading github.com/go-kit/kit v0.10.0
go: downloading github.com/prometheus/client_golang v1.9.0
go: downloading github.com/prometheus/common v0.17.0
go: downloading github.com/prometheus/exporter-toolkit v0.5.1
go: downloading gopkg.in/yaml.v2 v2.4.0
go: downloading gopkg.in/alecthomas/kingpin.v2 v2.2.6
go: downloading github.com/go-logfmt/logfmt v0.5.0
go: downloading github.com/prometheus/client_model v0.2.0
go: downloading github.com/beorn7/perks v1.0.1
go: downloading github.com/cespare/xxhash/v2 v2.1.1
go: downloading github.com/golang/protobuf v1.4.3
go: downloading github.com/prometheus/procfs v0.2.0
go: downloading github.com/pkg/errors v0.9.1
go: downloading golang.org/x/crypto v0.0.0-20201208171446-5f87f3452ae9
go: downloading github.com/matttproud/golang_protobuf_extensions v1.0.1
go: downloading github.com/alecthomas/template v0.0.0-20190718012654-fb15b899a751
go: downloading github.com/alecthomas/units v0.0.0-20190924025748-f65c72e2690d
go: downloading google.golang.org/protobuf v1.23.0
go: downloading github.com/mwitkow/go-conntrack v0.0.0-20190716064945-2f068394615f
go: downloading golang.org/x/net v0.0.0-20200625001655-4c5254603344
go: downloading golang.org/x/sys v0.0.0-20201214210602-f9fddec55a1e
go: downloading github.com/jpillora/backoff v1.0.0
go: downloading golang.org/x/text v0.3.2

export DATA_SOURCE_NAME=postgresql://postgres_exporter:password@localhost:5432/postgres?sslmode=disable
./postgres_exporter