ytt formatting converts multi line strings to single line strings due to trailing spaces

[fritzduchardt]

What steps did you take:
I am running ytt on a config map with a multi line string and a trailing space after the colon in line 7, e.g.:

  1 apiVersion: v1
  2 kind: ConfigMap
  3 metadata:
  4   name: my-config.map
  5 data:
  6   config: |
  7     metricsConfig: 
  8       enabled: true
  9       path: /metrics
 10       port: 9090
 11       ignoreErrors: false
 12       secure: false

What happened:
Ytt unexpectedly converts the multi-line string to a single-line string:

apiVersion: v1
kind: ConfigMap
metadata:
  name: my-config.map
data:
  config: "metricsConfig: \n  enabled: true\n  path: /metrics\n  port: 9090\n  ignoreErrors: false\n  secure: false\n"

What did you expect:
The multi-line string should be kept. The trailing white space could be removed.

Environment:

• ytt version (use ytt --version): 0.44.0
• OS (e.g. from /etc/os-release): Ubuntu 20.04.4 LTS

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[dteoh]

I don't have any errant trailing spaces in my multi-line strings but recently also saw that ytt is now collapsing everything into a very long single line string, so it would be great to get this behaviour reverted or configurable.

[sethiyash]

I'm able to successfully reproduce this issue. We will run our thoughts on this internally and set the priority accordingly.

Meanwhile, if you are willing to contribute, we will be happy to review it on a priority basis.

[vmunishwar]

Also, could you please let us know if this is a blocking issue for your use case or you found any workaround?

[fritzduchardt]

My current workaround is to run sed -r " s#:\s+$#:#g" on my yamls before handing them to ytt.

[fritzduchardt]

@sethiyash Please have a look at my PR to fix the issue

[vmunishwar]

@fritzduchardt Thank you for reaching out with this issue and we appreciate the work you have done to fix it.
However, this seems to be an issue present in yaml.v2 library which is used in ytt and also we verified that this issue is present in yaml.v3 library. It would be nice if we can raise this PR in API v2 of the yaml package for Go. Please let us know your thoughts on this. Thank you.