Remove unneeded dependencies

[thcrt]

I'm resubmitting #33 from a branch with only the two pertinent commits, so as to avoid dragging upstream along with any further changes until they're ready.

I plan to actively maintain my fork, Hetzname, going forward, since it's useful and important to me. Of course, I'll push changes upstream, which you are welcome to accept or deny as you wish.

I'd also be happy to maintain this upstream repo if you'd have me :^)

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• Remove awk as a dependency by using grep and tail.
• Remove dig as a dependency by using curl¹.
• Remove bash as a dependency by using sh².

These changes make use of the tool substantially easier on OpenWRT routers, where storage space is often at a premium and thus unneeded dependencies are sub-optimal.

Footnotes

1. And use Hetzner's own external IP detector ↩

2. On OpenWRT routers, and perhaps other notable systems, this is a symlink to ash which works just as well. bash is not pre-installed on such devices. ↩

[FarrowStrange]

Hey @thcrt
please excuse the late reply. Thanks for this great change so that the project can be used on more systems.

Since my resources are unfortunately very limited I would be very happy about a collaboration to keep the project active and up to date.

[thcrt]

@FarrowStrange If you'd like, you could add me as a collaborator/maintainer? Then I can review issues/PRs/etc :)