错误: dockerfile解析错误无效字段‘’

Question

我正试图将Go开发环境封装起来。我指的博客：https://www.docker.com/blog/containerize-your-go-developer-environment-part-1/

我收到了一个错误：

未能解决与前端dockerfile.v0:未能解决与前端gateway.v0: rpc错误:代码=未知desc =无效字段'‘必须是一个key=value对Makefile:8:配方的目标’bin/示例失败的制造：*bin/示例错误1

我的Dockerfile：

# syntax = docker/dockerfile:1-experimental

FROM --platform=${BUILDPLATFORM} golang:1.17.8-alpine AS base
WORKDIR /src
ENV CGO_ENABLED=0
COPY go.* .
RUN --mount=type=cache, target=/go/pkg/mod go mod download

FROM base AS build
ARG TARGETOS
ARG TARGETARCH
RUN --mount=target=. --mount=type=cache, target=/go/pkg/mod --mount=type=cache, target=/root/.cache/go-build GOOS=${TARGETOS} GOARCH=${TARGETARCH} go build -o /out/example .

FROM base AS unit-test
RUN --mount=target=. --mount=type=cache, target=/go/pkg/mod --mount=type=cache, target=/root/.cache/go-build go test -v .

FROM golangci/golangci-lint:v1.43-alpine AS lint-base

FROM base AS lint
RUN --mount=target=. --mount=from=lint-base, src=/usr/bin/golangci-lint, target=/usr/bin/golangci-lint --mount=type=cache, target=/go/pkg/mod --mount=type=cache, target=/root/.cache/go-build --mount=type=cache, target=/root/.cache/golangci-lint golangci-lint run --timeout 10m0s ./...

FROM scratch AS bin-unix
COPY --from=build /out/example /

FROM bin-unix AS bin-linux
FROM bin-unix AS bin-darwin

FROM scratch AS bin-windows
COPY --from=build /out/example /example.exe

FROM bin-${TARGETOS} AS bin

Makefile如下：

all: bin/example
test: lint unit-test

PLATFORM=linux/amd64

.PHONY: bin/example
bin/example:
    @docker build . --target bin --output bin/ --platform ${PLATFORM}

.PHONY: unit-test
unit-test:
    @docker build . --target unit-test

.PHONY: lint
lint:
    @docker build . --target lint

在航站楼：

atin@atin-VirtualBox:~/Desktop/container-go-dev$ export DOCKER_BUILDKIT=1
atin@atin-VirtualBox:~/Desktop/container-go-dev$ make
[+] Building 23.2s (5/5) FINISHED                                               
 => [internal] load build definition from Dockerfile                       1.6s
 => => transferring dockerfile: 38B                                        0.4s
 => [internal] load .dockerignore                                          1.3s
 => => transferring context: 34B                                           0.3s
 => resolve image config for docker.io/docker/dockerfile:1-experimental   10.3s
 => [auth] docker/dockerfile:pull token for registry-1.docker.io           0.0s
 => CACHED docker-image://docker.io/docker/dockerfile:1-experimental@sha2  0.0s
failed to solve with frontend dockerfile.v0: failed to solve with frontend gateway.v0: rpc error: code = Unknown desc = failed to create LLB definition: dockerfile parse error line 7: invalid field '' must be a key=value pair
Makefile:8: recipe for target 'bin/example' failed
make: *** [bin/example] Error 1

Answer 1

这是您的停靠文件的第7行：

RUN --mount=type=cache, target=/go/pkg/mod go mod download

我当然不是dockerfiles方面的专家，但这种语法在我看来并不正确。我不知道RUN命令在您的映像中调用了什么程序，但是我怀疑这里是否应该有逗号，在“装入”和“类型”之间是否应该有等号，还是应该是破折号呢？还有，在这里用"--“来传递一个选项有效吗？

Answer 2

在整个文件中有许多无效的空格，包括顶部的语法行(可能导致忽略它)和--mount选项：

RUN --mount=type=cache, target=/go/pkg/mod go mod download

应该是

RUN --mount=type=cache,target=/go/pkg/mod go mod download