供应商/数据库在 Docker 映像中找不到包

Question

I'm writing a simple app in GO and using postges I have this folder structure

  |--- Dockerfile 
  |--- api.go 
  |--- vendor/ 
         database/
            init.go

and here is my dockerfile

FROM golang:1.9

ARG app_env
ENV APP_ENV $app_env

COPY . .
WORKDIR /project

RUN go get ./vendor/database

RUN go get ./
RUN go build

CMD if [ ${APP_ENV} = production ]; \
    then \
    api; \
    else \
    api; \
    fi

EXPOSE 8080

when I working docker-compose up I m getting this error:

Error Message

Step 6/10 : RUN go get ./vendor/database
 ---> Running in 459740ba584c
can't load package: package ./vendor/database: cannot find package "./vendor/database" in:
        /project/vendor/database
Service 'api' failed to build: The command '/bin/sh -c go get ./vendor/database' returned a non-zero code: 1

Where am I going wrong with the project structure?

Answer 1

You are copying the source to default directory of the base image with the command COPY . . COPY . . . Then you are making /project as working directory with WORKDIR /project . So when you run RUN go get ./vendor/database , the command is actually run in /project/vendor/database which does not exist. Switch the order of COPY and WORKDIR as follows

WORKDIR /project
COPY . .