Use wget if curl is unavailable

[ukoloff]

trafficstars

Default installation of Debian has wget installed, but not curl.

It would be handy if getssl could use wget when curl is missing. acme.sh does this.

[tlhackque]

It would be simpler to just install curl. curl is a well supported tool packaged for pretty much every distribution - so installing it shouldn't be an issue. And much lower risk of introducing a regression.

So, if no curl: check for a repo tool, such as apt-get (Debian), dnf (RedHat) and if one is available, try to install curl.

To avoid upseting the truly paranoid, prompt & ask permission first (it's a one-time thing)...and setup/first use is very likely to be interactive.

Supporting wget instead would complicate the code - and testing - a lot more than this approach, which would be one contiguous block of code.

[timkimber]

I agree that adding support for wget will complicate the code, but not everyone has the luxury of being able to install tools on their servers - I use cpanel hosting and although I can get shell access and run scripts, I can't install anything.