Install base docker image from bash

Question

My dockerfile is as below:

FROM bash:4.4
COPY prerequisites_ubuntu.sh   /temp/prerequisites_ubuntu.sh 
RUN  /temp/prerequisites_ubuntu.sh

prerequisites_ubuntu.sh :

FROM ubuntu:latest

apt-get update  
apt-get install -y    coreutils  git-core ssh scons build-essential g++ libglib2.0-dev unzip uuid-dev python-dev autotools-dev gcc libjansson-dev cmake

When I do docker build "docker build --rm --no-cache -t my_image ." It gives error as

/temp/prerequisites_ubuntu.sh: line 1: FROM: not found
/temp/prerequisites_ubuntu.sh: line 3: apt-get: not found
/temp/prerequisites_ubuntu.sh: line 4: apt-get: not found

The prerequisites_ubuntu.sh file will change for RaspberryPI or other platform

Add a shebang to your bash script. FROM is no bash command. — Cyrus
– Cyrus, Commented Jun 21, 2019 at 8:15
The image bash:4.4 not have FROM command and also not have apt, prerequisites_ubuntu.sh not a valid bash file. — atline
– atline, Commented Jun 21, 2019 at 8:16

Blokje5 · Accepted Answer · 2019-06-21 08:18:00Z

1

There are a couple of issues with the prerequisites_ubuntu.sh file. First of all, it is not an sh file. You are missing a shebang (which specifies which shell to use to execute the script). the FROM statement is part of the Dockerfile spec, not of shell scripts (which is why you get FROM: not found) as an error. And the bash image is based on alpine linux, which does not use apt-get but it uses apk add. Once you change the shell script to use apk add, add a shebang, and remove the FROM statement it should work.

answered Jun 21, 2019 at 8:18

Blokje5

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7 Comments

Zaks Over a year ago

My task is that I should run a simple script prerequisites_ubuntu.sh or prerequisite_rpi.sh which should install base image and dependant packages . The script to be run is chosen based on user input on the platform used . I have to use FROM bash else it will not allow me to do RUN inside dockerfile. How could I probably achieve this

Blokje5 Over a year ago

Maybe it is good to specify in your question what exactly you want to achieve. Do you want to use this dockerfile to install a raspbarry py?

Zaks Over a year ago

I want to run prerequisites code on ubuntu-Linux and Raspberry PI– arm linux platform.Base image cannot be ubuntu in both the platforms as far as I know. Please correct. Therefore I want to run bash script at the beginning to choose the base image. Hence the question

Blokje5 Over a year ago

The whole point of Docker is that you can run the same code on irrespective of the underlying OS (with some quirks), but it seems as if your goal is to install the packages on the underlying OS, which might be a bit more involved. You are currently installing the packages on the docker image when you call RUN.

Zaks Over a year ago

So I can use the base image same and install dependant packages based on the Hardware I want to run the docker image .

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