Running docker build based on argument

Question

Dockerfile:

ARG arg
FROM main-registry.gitlab.com/base/folder/:{$arg}

specific conda environment file to use
ARG conda_environment=environment.yml

COPY . .

RUN conda update --quiet conda

I need to replace this $arg with the value provided in the build command:

docker build --build-arg arg="image_id" -t hello .

I am getting the arg correctly but I am not able to replace the value of the argument in url.

Ideal case:

new url = url/image_id

Reality:

new url = url/$arg

Can you please post an actual unedited snippet or all of your Dockerfile? Your syntax seems wrong with the {} from what you originally posted. Seems like it should be FROM url/${arg} instead — cam
– cam, Commented Mar 3, 2021 at 2:07
ARG arg FROM main-registry.gitlab.com/base/folder/:{$arg} # specific conda environment file to use ARG conda_environment=environment.yml COPY . . RUN conda update --quiet conda — Isha Nema
– Isha Nema, Commented Mar 3, 2021 at 2:17
can you please edit your post instead of posting this in a comment? Thanks! — cam
– cam, Commented Mar 3, 2021 at 2:18

Ryan.Bartsch · Accepted Answer · 2021-03-03 02:21:49Z

1

I've done this before.

In your Dockerfile, you can have ARG commands before your initial FROM e.g. The following is taken from one of my Dockerfile templates (for ASP.NET Core multi-stage docker build):

ARG BUILD_IMAGE_TAG
ARG RUNTIME_IMAGE_TAG

FROM mcr.microsoft.com/dotnet/core/sdk:${BUILD_IMAGE_TAG} AS build

...

FROM mcr.microsoft.com/dotnet/core/aspnet:${RUNTIME_IMAGE_TAG} AS runtime

...

I suspect you've just got the syntax slightly wrong; {$arg} should be ${arg} as per my example above.

answered Mar 3, 2021 at 2:21

Ryan.Bartsch

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1 Comment

Isha Nema Over a year ago

Thanks it worked. I was missing the : and was giving /.

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