Inline editing with CopyFile ?

[gardar]

It seems that currently there are two ways to do in-line file editing. Either with GetPackageOriginalFile or CreateFile.

In a situation where I have a config I want to copy that differs between systems but that file does not come from a package, and echoing the whole content of the file with CopyFile doesn't feel right.

Ideally what I would like to do is something similar to the examples you provide with inline editing using GetPackageOriginalFile, but using a file I have under files/ instead of getting it from a package.
Is there any way CopyFile or CopyFileTo can be used to achieve this?

[CyberShadow]

Yes, I don't think there's a helper for this. I would try something like this:

target="$(CreateFile /etc/passwd)"
cp "$config_dir"/templates/etc/passwd "$target"
sed -i 's/.../' "$target"
...

[gardar]

Perfect, that works!