How to over write helm values yaml file?

In my values file I have

image:
  tag: '123465'

I want to overwrite this from my github ci/cd so Argocd can pick it up

I'm writing this command

sed -i 's|image.tag:.*|image.tag: test|g' dev-*.yaml

I'm getting

> sed: 1: "dev.yaml": extra characters at the end of d command

error.

What am I missing?

Is it necessary for you to use sed? helm supports overriding values via the command line, so you can do something like:

helm install some-name some-chart --set "image.tag=test"

This will override the value from the values.yaml file with the value test.

Above is detailed out in the documentation.

Using sed

The error message you've shared does not match the command, maybe it got mixed up?

Assuming you have a dev.yaml file with:

image:
  tag: '123456'

You can replace the tag value with foobar using:

sed -i 's|^  tag:.*|  tag: "foobar"|' dev.yaml

Keep in mind that the two spaces before tag within the sed command are intentional.

This however breaks down rather quickly if you have another tag: somewhere in your file, say:

image:
  tag: "123456"

someOtherImage:
  tag: "baz"

Running the above command will yield a file that has both tag: values replaced. To get around this, you can use branching:

sed -i '/^image:$/{ n; s|^  tag:.*$|  tag: "foobar"|g }' dev.yaml

Here, /^image:$/ matches lines that contain exactly image:, n; directs sed to load the immediate next line, while the final s|^ tag:.*$| tag: "foobar"|g sed command does the tag replacement, only for the line after image:.

Above is inspired from this blog.