feature request: new built-in function base64(string)

[glerchundi]

I would like to include in a cloud-config (which is formatted using YAML) section my custom certification authority certificate, which contains newlines. If I use directly with ${file} cloud-config will fail parsing.

What do you think if we can make a function like base64("mystring") which interpolates to the encoded base64 format?

Use-case:

#cloud-config

[...]

write_files:
  - path: "/etc/ssl/etcd/ca-chain.cert.pem"
    permissions: "0600"
    owner: "etcd"
    encoding: "base64"
    content: |
      ${base64(file("etcd-ca-chain.cert.pem"))}

WDYT?

[apparentlymart]

It sounds good to me!

If someone wants to look at implementing this and hasn't done this sort of thing before, my PR #3127 is an example of a change adding new interpolation functions. Since encoding/base64 is in the Go standard library the implementation should be relatively simple.

[ghost]

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