Question 46661 in Debian Question posted in
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Docker download and install binary – Debian

im trying to install the Hugo tool in docker file following this guideline

https://gohugo.io/getting-started/installing/#debian-and-ubuntu

What I did is the following

FROM debian:11.3
RUN apt-get update 
    && apt-get install -y --no-install-recommends 
         hugo
RUN ["hugo version"]

The docker build working except the last statement RUN ["hugo version"]

the error is > [3/3] RUN ["hugo version"]: #7 0.173 container_linux.go:380: starting container process caused: exec: "hugo version": executable file not found in $PATH how can I add it to the path, I assume that if I download it it should be there but no. any idea?

UPDATE

when I change it to
RUN hugo version

I got the following output without the version printed, any idea what am I missing here?

#7 [3/3] RUN hugo version
#7 sha256:d032565cca2aac041e6791690dbcb32f2dc9d024d05699f67d21eb51cb39b0fc
#7 CACHED

#8 exporting to image
#8 sha256:e8c613e07b0b7ff33893b694f7759a10d42e180f2b4dc349fb57dc6b71dcab00
#8 exporting layers done
#8 writing image sha256:db76bafd84f0bdf930625714a72e2d0e1967578c48df0ffd0b4fc869c802f18f done
#8 DONE 0.0s
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2

Answers


  1. 0

    When docker build executes the line: RUN hugo version, then by default, it does not show the output of the run commands that were not loaded from the cache. And hence you are not seeing its output.

    When I ran docker build command with this flag: --progress=plain, I could see the output of "non-cached" line for RUN command. More details can be found in this answer. Here is the screenshot for the output I got:
    enter image description here

    A few observations:

    1. I saw in one of the comments that you tried to run docker build using this flag but it still did not work. This is because, if you closely observe, that "RUN hugo version" line is "CACHED". And this flag --progress=plain shows intermediate steps of the lines that are not cached or freshly executed.
      So, if you wish to view the output, you need to first clear your docker build cache and all the dangling images using the commands:
    $docker builder prune -a
$docker image prune -a

    After this step, you will be able to freshly execute all your build steps and will be able to see output of RUN hugo version.

    1. To keep your hugo container running after you spin it from the image you build, you need to specify either CMD or ENTRYPOINT command. The command specified with these dockerfile instructions are executed only when you spin a container from the image that you have already built, not when the image is being built. For example if my dockerfile is:
    FROM debian:11.3
RUN apt-get update 
    && apt-get install -y --no-install-recommends 
         hugo
CMD hugo version

    The output during build would be:
    enter image description here
    The instruction CMD hugo version is not executed.

    After I run a container from this built image via command:
    enter image description here
    Then only I would see the output of this instruction coming.

    I hope this helps in building the understanding!

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  2. 0

    You can run the docker build command with --no-cache to see the output without cache:

    Full Dockerfile:

    FROM debian:11.3
RUN apt-get update 
    && apt-get install -y --no-install-recommends 
         hugo
RUN hugo version

    Full command:

    docker build . --progress plain --no-cache

    This displays:

    #6 [3/3] RUN hugo version
#6 sha256:d032565cca2aac041e6791690dbcb32f2dc9d024d05699f67d21eb51cb39b0fc
#6 0.494 Hugo Static Site Generator v0.80.0/extended linux/amd64 BuildDate: 2021-07-18T09:31:51Z (debian 0.80.0-6+b5)
#6 DONE 0.5s

    Also, you need to keep the command and parameters separate when using the []-syntax, so it would look like RUN ["hugo", "version"]

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