tmpl.Dockerfile name cannot be changed

[andig]

I needed to have a separate template file and copied tmpl.Dockerfileto ci.Dockerfile. Running with different name fails:

Version: 0.62 2021-08-22_09:43:34
seihon publish --dry-run=false --template docker/ci.Dockerfile --base-runtime-image alpine:3.13 \
       --image-name andig/evcc -v "latest" --targets=arm.v6,arm.v8,amd64
Error: template: "tmpl.Dockerfile" is an incomplete or empty template

This seems to happen inside parse.Execute because t.Tree is nil but I couldn't figure out why. The produced architecture dockerfile turns up empty.

[andig]

Update: looks as if the problem is the command chaining:

    if name == t.Name() {
        tmpl = t
    } else {
        tmpl = t.New(name)
    }

will create a template of ci.Dockerfile name, not tmpl.Dockerfile as one might expect due to

parse, err := template.New("tmpl.Dockerfile").
    Funcs(sprig.FuncMap()).
    ParseFiles(dockerfileTemplate)
if err != nil {
    return err
}

Imho this does not work as expected

[andig]

One potential workaround could be to use template.Parse instead of template.ParseFiles here as this will keep the template name unchanged. I'm not sure if that will handle hierarchical templates though.

[ldez]

Fixed by 3f28a201b4402c19d2ad9d898da4fd9a61ccdd4e