CODEWITHSUNDEEP
dockerdocker-composeyaml
Raphael
Raphael

Reputation: 47

using custom command, pipe and nested quotes in docker-compose.yml

I am using a container that allows to pass a command to be run during the entrypoint : the entrypoint does an exec $@.

I would like to run this command to add a line at the end of the config file :

cat /etc/program/config.yaml | grep "include: custom-config.yaml" || echo "include: custom-config.yaml" >> /etc/program/config.yaml

I'm trying to use it in docker-compose.yml like that :

command: ["/bin/bash", "-c", "'cat /etc/program/config.yaml | grep ''include: custom-config.yaml'' || echo ''include: custom-config.yaml'' >> /etc/program/config.yaml '"]

but this doesn't works

/etc/program/config.yaml: -c: line 1: syntax error: unexpected end of file
/etc/program/config.yaml: -c: line 0: unexpected EOF while looking for matching `''
/etc/program/config.yaml: -c: line 1: syntax error: unexpected end of file
/etc/program/config.yaml: -c: line 0: unexpected EOF while looking for matching `''
...

I think it might be caused by the pipe (see What is the use of the pipe symbol in YAML?), but I haven't been able to fix it

Thanks

Upvotes: 0

Views: 1612

Answers (2)

Raphael
Raphael

Reputation: 47

I finally created a script like that :

#!/bin/bash

cat /etc/program/config.yaml | grep "include: custom-config.yaml" || echo "include: custom-config.yaml" >> /etc/program/config.yaml

/docker-entrypoint.sh

and used it in the docker-compose file

entrypoint: /new_entrypoint.sh

Upvotes: 0

Antonio Petricca
Antonio Petricca

Reputation: 11006

I suggest you to create a script name run.sh like this:

#!/bin/bash

cat /etc/program/config.yaml | grep "include: custom-config.yaml" || echo "include: custom-config.yaml" >> /etc/program/config.yaml

Then create a docker file like the following:

FROM {{SOME_IMAGE}}

# ... some instructions ...

COPY run.sh .
CMD [ "run.sh" ]

Upvotes: 3

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