go mod download不会下载单个库；如何在不处理整个供应商缓存的情况下mod导入单个库

问题描述

（免责声明：对于在此描述中使用的错误单词表示歉意。我仍然熟悉go）

我的理解是go模块非常挑剔，因此这种问题涵盖了与go模块和我尝试下载并导入的prometheus运算符库相关的一些主题

一个巨大的要求：我不能进行大量的go mod下载/升级，因为下游部门在我的供应商目录中得到了升级，并且在我们的代码中发生了各种各样的破坏。我正在努力避免这种情况。我只想“安装”这个库（和任何必要的附件）并完成它。

所有这些都说明，使用go mod（或其他合适的工具）来获取不会更新我的所有供应商库的"github.com/coreos/prometheus-operator/pkg/apis/monitoring/v1"的正确方法是什么？我只需要导入v1 api即可以编程方式设置和读取集群中的servicemonitor。

$ go mod download -x github.com/coreos/prometheus-operator/pkg/apis/monitoring/v1
module github.com/coreos/prometheus-operator/pkg/apis/monitoring/v1: not a kNown dependency

或

$ go get github.com/coreos/prometheus-operator/pkg/apis/monitoring/v1
go: found github.com/coreos/prometheus-operator/pkg/apis/monitoring/v1 in github.com/coreos/prometheus-operator v0.41.1

我的进口

import (
    "context"
    "encoding/base64"
    "fmt"
    v1 "k8s.io/api/core/v1"
    "k8s.io/apimachinery/pkg/util/intstr"
    "strings"
    "text/template"
    "time"

    "github.com/google/uuid"

    coreosv1 "github.com/coreos/prometheus-operator/pkg/apis/monitoring/v1"
    "github.com/go-kit/kit/log"

    Metav1 "k8s.io/apimachinery/pkg/apis/Meta/v1"
    "k8s.io/client-go/kubernetes"
    "k8s.io/client-go/tools/clientcmd"
)

我正在使用该库的实际代码如下：

    // define service monitor object
    serviceMonitorObject := &coreosv1.ServiceMonitor{
        ObjectMeta: Metav1.ObjectMeta{
            Name:      objectMetaDataname,// Todo: fix namespace
            Namespace: "monitoring",Labels:    labels,},Spec: coreosv1.ServiceMonitorSpec{
            Selector: Metav1.LabelSelector{
                MatchLabels: labels,NamespaceSelector: coreosv1.NamespaceSelector{
                MatchNames: []string{
                    "monitoring",Endpoints: []coreosv1.Endpoint{
                {
                    Port: "metrics",Interval: "10s",HonorLabels: true,}

但是，我似乎不能只导入一个库。任何建议或帮助将不胜感激。

错误github.com/coreos/prometheus-operator/pkg/apis/monitoring/v1 in github.com/coreos/prometheus-operator v0.41.1表明也许我只是导入了github.com/coreos/prometheus-operator，但是当我这样做时，我的servicemonitor定义就失败了。

编辑

我rm建立了go.{mod,sum}和vendor目录以及git reset --hard我的环境，这将供应商状态恢复到我的工作之前。我执行了以下操作，但正如您所看到的，get似乎可以正常工作，但是coreos下没有/project/vendor/*/目录。

$ go get -x github.com/coreos/prometheus-operator/
# get https://proxy.golang.org/github.com/coreos/@v/list
# get https://proxy.golang.org/github.com/@v/list
# get https://proxy.golang.org/github.com/coreos/prometheus-operator/@v/list
# get https://proxy.golang.org/github.com/@v/list: 410 Gone (0.794s)
# get https://proxy.golang.org/github.com/coreos/@v/list: 410 Gone (0.886s)
# get https://proxy.golang.org/github.com/coreos/prometheus-operator/@v/list: 200 OK (0.897s)
go: github.com/coreos/prometheus-operator upgrade => v0.41.1
$ find vendor -name '*prometheus*'
vendor/github.com/go-kit/kit/metrics/prometheus
vendor/github.com/go-kit/kit/metrics/prometheus/prometheus.go
vendor/github.com/prometheus
vendor/github.com/prometheus/client_golang/prometheus

再次重置我的环境。执行以下操作：

$ go mod download -x github.com/coreos/prometheus-operator/...
warning: pattern "github.com/coreos/prometheus-operator/..." matched no module dependencies
$ go mod download -x github.com/coreos/prometheus-operator/
module github.com/coreos/prometheus-operator/: not a kNown dependency

根据文档，以下内容应显示使用的所有mod（添加grep core以获得更简短的输出）：

$ go list -m all | grep core
github.com/coreos/bbolt v1.3.2
github.com/coreos/etcd v3.3.10+incompatible
github.com/coreos/go-etcd v2.0.0+incompatible
github.com/coreos/go-oidc v2.2.1+incompatible
github.com/coreos/go-semver v0.3.0
github.com/coreos/go-systemd v0.0.0-20190321100706-95778dfbb74e
github.com/coreos/pkg v0.0.0-20180928190104-399ea9e2e55f
github.com/coreos/prometheus-operator v0.41.1

但是，我仍然无法编译：

$ make -f build/Makefile generators ims-bin-darwin && ./ims-api --config_file=/var/tmp/jim-ims-api.yaml --kubeconfig $HOME/.kube/config --populate_demo_db=true --populate_demo_file hack/demo1.yaml --debug_logging --db_debug_logging
./build/generators/api.sh
Ensuring Bin Directory (./build/generators/../../bin) Exists...
Ensuring Destination Directory ( pkg/generated/api ) Exists...
Ensuring Destination Directory ( pkg/generated/kaas-api ) Exists...
Ensuring Swagger Asset Directory ( assets/generated/swagger ) Exists...
go: inconsistent vendoring in /Users/jimconn/projects/src/ims-api:
        github.com/go-kit/[email protected]: is explicitly required in go.mod,but vendor/modules.txt indicates github.com/go-kit/[email protected]
        github.com/golang/[email protected]: is explicitly required in go.mod,but vendor/modules.txt indicates github.com/golang/[email protected]
        github.com/grpc-ecosystem/[email protected]: is explicitly required in go.mod,but vendor/modules.txt indicates github.com/grpc-ecosystem/[email protected]
        github.com/pkg/[email protected]: is explicitly required in go.mod,but vendor/modules.txt indicates github.com/pkg/[email protected]
        github.com/prometheus/[email protected]: is explicitly required in go.mod,but vendor/modules.txt indicates github.com/prometheus/[email protected]
        golang.org/x/[email protected]: is explicitly required in go.mod,but vendor/modules.txt indicates golang.org/x/[email protected]
        google.golang.org/[email protected]: is explicitly required in go.mod,but vendor/modules.txt indicates google.golang.org/[email protected]
        google.golang.org/[email protected]: is explicitly required in go.mod,but vendor/modules.txt indicates google.golang.org/[email protected]
        gopkg.in/[email protected]: is explicitly required in go.mod,but vendor/modules.txt indicates gopkg.in/[email protected]
        k8s.io/[email protected]: is explicitly required in go.mod,but vendor/modules.txt indicates k8s.io/[email protected]
        k8s.io/[email protected]: is explicitly required in go.mod,but vendor/modules.txt indicates k8s.io/[email protected]
        k8s.io/[email protected]: is explicitly required in go.mod,but vendor/modules.txt indicates k8s.io/[email protected]

run 'go mod vendor' to sync,or use -mod=mod or -mod=readonly to ignore the vendor directory
make: *** [generators] Error 1

我运行了go mod vendor，然后又回到了我的整个供应商树都被更改的状态：

$ g st
On branch expose-bm-prom
Your branch is up to date with 'origin/expose-bm-prom'.

Changes not staged for commit:
  (use "git add/rm <file>..." to update what will be committed)
  (use "git checkout -- <file>..." to discard changes in working directory)

        modified:   assets/generated/swagger/api.swagger.json
        modified:   go.mod
        modified:   go.sum
        modified:   pkg/generated/api/api.pb.go
        modified:   pkg/generated/api/api.pb.gw.go
...
        modified:   vendor/sigs.k8s.io/yaml/README.md
        modified:   vendor/sigs.k8s.io/yaml/yaml.go

Untracked files:
  (use "git add <file>..." to include in what will be committed)

        vendor/github.com/cespare/
        vendor/github.com/coreos/
        vendor/github.com/golang/protobuf/internal/
        vendor/github.com/golang/protobuf/jsonpb/decode.go
        vendor/github.com/golang/protobuf/jsonpb/encode.go
...
        vendor/k8s.io/client-go/util/workqueue/
        vendor/sigs.k8s.io/structured-merge-diff/
        vendor/sigs.k8s.io/yaml/go.mod
        vendor/sigs.k8s.io/yaml/go.sum

no changes added to commit (use "git add" and/or "git commit -a")

$ g st | grep -c vendor
942    # files changed

这只是世界状况吗？如果不处理对整个供应商树的大量更改，我是否无法导入该库，这完全破坏了我的代码！这太荒谬了！

解决方法

go get -d github.com/coreos/prometheus-operator/pkg/apis/monitoring/v1 是添加对提供该包的模块的最新版本的依赖的正确方法。

当 go get 添加模块依赖时，它会根据需要升级其他依赖项以满足新模块的要求。这可能就是您在运行 go mod vendor 时看到很多变化的原因。

如果您想尽量减少这些更改，您可能需要明确选择较旧的版本（以便它具有较旧的要求）：

go get -d github.com/coreos/prometheus-operator/pkg/apis/monitoring/v1@$OLD_VERSION