docker - Docker镜像构建失败，出现 “COPY failed: no source files were specified”

Question

我正在尝试使用Golang Docker SDK构建docker镜像，但{"message": "COPY failed: no source files were specified"}," error": "COPY failed: no source files were specified"}失败
这是我的代码

 package main
 import (
  "archive/tar"
  "bytes"
  "context"
  "fmt"
  "io"
  "io/ioutil"
  "os"

  "github.com/docker/docker/api/types"
  "github.com/docker/docker/client"
 )

func buildImage(client *client.Client, tags []string, dockerfile string) error {
ctx := context.Background()

// Create a buffer
buf := new(bytes.Buffer)
tw := tar.NewWriter(buf)
defer tw.Close()

// Create a filereader
dockerFileReader, err := os.Open(dockerfile)
if err != nil {
    return err
}

// Read the actual Dockerfile
readDockerFile, err := ioutil.ReadAll(dockerFileReader)
if err != nil {
    return err
}

// Make a TAR header for the file
tarHeader := &tar.Header{
    Name: dockerfile,
    Size: int64(len(readDockerFile)),
}

// Writes the header described for the TAR file
err = tw.WriteHeader(tarHeader)
if err != nil {
    return err
}

// Writes the dockerfile data to the TAR file
_, err = tw.Write(readDockerFile)
if err != nil {
    return err
}

dockerFileTarReader := bytes.NewReader(buf.Bytes())

buildOptions := types.ImageBuildOptions{
    Context:    dockerFileTarReader, 
    Dockerfile: dockerfile,
    Remove:     true,
    Tags:       tags,
}
// Build the actual image
imageBuildResponse, err := client.ImageBuild(
    ctx,
    dockerFileTarReader,
    buildOptions,
)

if err != nil {
    return err
}

// Read the STDOUT from the build process
defer imageBuildResponse.Body.Close()
_, err = io.Copy(os.Stdout, imageBuildResponse.Body)
if err != nil {
    return err
}

return nil
}

这是我的文件夹结构，尝试使用src的Dockerfile构建docker镜像。
我想考虑docker build的 src内部的所有文件。

-- root
   |-- src 
       |--Dockerfile
       |--files
   |-- go-code
       |--build.go

Dockerfile

FROM node:12


WORKDIR /app
COPY package*.json ./
RUN npm install

COPY . .

EXPOSE 3000

CMD [ "node", "index.js" ]

详细错误消息:

{"errorDetail":{"message":"COPY failed: no source files were specified"},"error":"COPY failed: no source files were specified"}

Answer 1

这取决于您从何处调用docker build。
例如。

-- root
   |-- src 
       |--Dockerfile
       |--files
   |-- go-code
       |--build.go

如果要复制 /root/src/files/中的文件，则需要cd到 /root/src文件夹中。
在这种情况下，docker命令将为: docker built -t <tagname> .在您的情况下，第一个“。”在COPY命令中将尝试从build.go运行所在的目录中进行复制。
这可能是您的脚本失败的原因。