Steve Kemp wrote:
> [...]
>   I think that aborting if the file doesn't exist is too strong
>  a reaction..

There is technically no use to give a non-existing config file - that is
clear because it's just ignored, if it doesn't exist - no action is taken.

So, if a user gives --config with an unexisting file it is therefore
very likely a typo, which the user wants to be warned as fast as
possible. In this case, there's no use to run the install until the end
with an unwanted configuration - the user wants to run again, with the
right config file.

If not error is given, and not stopped, it takes a long while to find
out that the wrong configuration is installed.

Henning


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