build: golang: does not copy all *.go files.

[jtagcat]

File: language/golang/build-images.md

COPY *.go ./ is misleading. It does not copy all needed files.

Using subdirectories and -packages is not uncommon in golang:

. (spotify-togit)
├── main.go
├── pkg
│   ├── git.go
│   └── os.go

Building the image in the container fails for non-obvious reasons:

main.go:15:2: no required module provides package github.com/jtagcat/spotify-togit/pkg; to add it:
        go get github.com/jtagcat/spotify-togit/pkg

pkg/ of the same module didn't get copied over.

Depends on this almost 3y old issue: moby/moby#39530

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[jtagcat]

See https://github.com/jtagcat/dotfiles/blob/main/scripts/template/gobuild.Dockerfile for workaround funk.

[docker-robott]

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If the problem is still relevant, mark the issue as fresh with a /remove-lifecycle stale comment.
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/lifecycle stale

[jtagcat]

unstale

no sane way of copying all go files reliably without copying a file at a time, or whole root

[jtagcat]

/remove-lifecycle stale

[jtagcat]

/lifecycle frozen

[krlozadan]

Still having the same issue. It's kind of annoying but you still have to do COPY . . and rely on a .dockerignore file to avoid files you don't want to

[sedyh]

+1 for this, it will not work with standard layout where all entrypoints are located in cmd subpackages.
The doc should be updated.

Error: error building at STEP "COPY *.go ./": checking on sources under "<path>/go/app": Rel: can't make  relative to <path>/go/app; copier: stat: ["/*.go"]: no such file or directory

My structure:

.
├── cmd
│   └── app
│       └── main.go
├── go.mod
└── go.sum

[kalalannn]

still issue
Step 5/9 : COPY *.go ./
COPY failed: no source files were specified