work in alternative shells

[dehydrated-io]

work in alternative shells

[lukas2511]

This is related to #109.

I think it's best trying to get this script somewhat posix compliant as this way it should work in quite a lot of shells.

[lukas2511]

Initial zsh compatiblity was added in da2eeda.

Will continue working on compatibility with some other shells.

I think busybox ash (as you suggest) would be a good next target so this script works on embedded systems with openwrt, angstrom, alpine, etc.

[lukas2511]

I just had a look at busybox ash and I don't think porting this script is worth it.
Ash really lacks a lot of features, which would require a ton of workarounds....

I'm closing this ticket now since there already is support for at least one other shell (zsh), and I guess it would work in some others too.
If there are (minor) issues with other shells there should be new tickets created instead of adding to this.

[bittorf]

i was testing the script under busybox.
i dont see too much problems fixing it for POSIX (so working in every shell):

e.g. these calls (there are a lot of)

csr64="$( <<<"${csr}" openssl req -outform DER | urlbase64)"

can be converted to:

csr64="$( echo "${csr}" | openssl req -outform DER | urlbase64)"

another thing are:

[[ var =~ (foo|bar)$ ]] || ...

which can be written as:

case "$var" in
  *foo|*bar);;
  *) ... ;;
esac

another things are arrays, e.g. ${deploy_args[@]} where we can make a small function