how to pass environment variable as value

[vikram-katkar]

Describe the bug
how to pass environment variable as value?

yq w temp.yaml data.role ${VALUE}

[mikefarah]

As you would with any other shell command.

export VALUE=cat
yq w temp.yaml data.role $VALUE

[StianOvrevage]

How is this done on v4, where everything is in a string that will not get expanded by the shell?

[StianOvrevage]

This works, even though it's a bit ugly:

yq eval ".imageTag = \"$GITHUB_SHA\"" deploy/values-old-dev.yaml > deploy/values-dev.yaml

[bilalinamdar]

I tried above it just got me the thing i changed. other parameters got DELETED !

[bilalinamdar]

for v4 this works

To change with var
myvar="data:/root"
yq eval ".services.app.volumes[0] = "$myvar"" -i docker-compose.yml

-i, --inplace update the yaml file inplace of first yaml file given.

Thanks to above command @StianOvrevage Just need to escape properly.

[sromocki]

@bilalinamdar

I still had to escape the double quotes in your above response to get it to work

yq eval ".services.app.volumes[0] = \"$myvar\"" -i docker-compose.yml

[bilalinamdar]

my mistake was to not include code tag that is why it is messed up in the post.
Apologies for the same. below i copy pasted same line of yours

yq eval ".services.app.volumes[0] = "$myvar"" -i docker-compose.yml

yq eval ".services.app.volumes[0] = \"$myvar\"" -i docker-compose.yml

[CarMoreno]

In a Dockerfile, I created an ARG called VARIABLE which is set from a docker-compose.yaml file. I used this sentence and it worked:

ARG VARIABLE
yq -i '.this.is.yourproperty = strenv(VARIABLE)' file.yml

[aerlaut]

@CarMoreno that inserts the value as a string right? Is there a way to parse VARIABLE into an integer?

[CarMoreno]

Yes @aerlaut as string. I did not know a way to parse it into an integer, sorry

[mikefarah]

Just use env(VARIABLE) instead :)

[leonarac]

Just use env(VARIABLE) instead :)

can i get a value from yml file, and store to a variable in a pipeline? im working with azure

[evelizg]

Hi @mikefarah
I need your support please.
I put this shell but doesn't work:
yaml is an environment variable
yq -i 'del(yaml)' ejemplo_config.yml