如何找到Go模块源缓存？

Question

我已经将项目升级到Go 1.11并为我的项目启用了模块支持,但似乎CircleCI正在重新下载每个构建的依赖项.我知道CircleCI允许在重建之间进行缓存,所以我查看了Go模块的文档,虽然它提到了缓存,但我似乎无法找到它实际存在的位置.

Go模块的源缓存在哪里？

Answer 1

截至最终的1.11版本,go 模块缓存(用于存储下载的模块和源代码)位于该$GOPATH/pkg/mod位置(请参阅此处的文档).为了澄清,go 构建缓存(用于存储最近的编译结果)位于不同的位置.

这篇文章指出,它是在$GOPATH/src/mod最近约40天的时间段内,golang团队必须改变目标位置.此消息线程讨论了下载项目最终的原因$GOPATH/pkg.

您还可以使用该go mod download -json命令查看下载的模块/源元数据及其在本地磁盘上的位置.示例输出如下:

$ go mod download -json
go: finding github.com/aws/aws-sdk-go v1.14.5
go: finding github.com/aws/aws-lambda-go v1.2.0
{
    "Path": "github.com/aws/aws-lambda-go",
    "Version": "v1.2.0",
    "Info": "/go/pkg/mod/cache/download/github.com/aws/aws-lambda-go/@v/v1.2.0.info",
    "GoMod": "/go/pkg/mod/cache/download/github.com/aws/aws-lambda-go/@v/v1.2.0.mod",
    "Zip": "/go/pkg/mod/cache/download/github.com/aws/aws-lambda-go/@v/v1.2.0.zip",
    "Dir": "/go/pkg/mod/github.com/aws/aws-lambda-go@v1.2.0",
    "Sum": "h1:2f0pbAKMNNhvOkjI9BCrwoeIiduSTlYpD0iKEN1neuQ=",
    "GoModSum": "h1:zUsUQhAUjYzR8AuduJPCfhBuKWUaDbQiPOG+ouzmE1A="
}
{
    "Path": "github.com/aws/aws-sdk-go",
    "Version": "v1.14.5",
    "Info": "/go/pkg/mod/cache/download/github.com/aws/aws-sdk-go/@v/v1.14.5.info",
    "GoMod": "/go/pkg/mod/cache/download/github.com/aws/aws-sdk-go/@v/v1.14.5.mod",
    "Zip": "/go/pkg/mod/cache/download/github.com/aws/aws-sdk-go/@v/v1.14.5.zip",
    "Dir": "/go/pkg/mod/github.com/aws/aws-sdk-go@v1.14.5",
    "Sum": "h1:+l1m6QH6LypE2kL0p/G0Oh7ceCv+IVQ1h5UEBt2xjjU=",
    "GoModSum": "h1:ZRmQr0FajVIyZ4ZzBYKG5P3ZqPz9IHG41ZoMu1ADI3k="
}

该输出来自CircleCI 2.0的构建,使用他们的官方circleci/golang:1.11图像.这是一个人为的例子,展示了如何包含新golang模块缓存位置的步骤restore_cache和save_cache步骤:

steps:
    - checkout
    - restore_cache:
       keys:
         - gomod-cache-{{ checksum "go.sum" }}
    - run: go vet ./...
    - save_cache:
        key: gomod-cache-{{ checksum "go.sum" }}
        paths:
          - /go/pkg/mod