macOS readlink does not have -f flag

[Coneko]

Not sure if this is supported or even intended to work, but right off the bat I hit:

% ./nix --help
readlink: illegal option -- f
usage: readlink [-n] [file ...]
./nix: line 55: : No such file or directory
Could not find or decompress resource archive.
This script can be rebuilt using the nixie tool
tar: Error opening archive: Unrecognized archive format
zsh: abort      ./nix --help
The resource archive is missing or malformed.
This script can be rebuilt using the nixie tool
./nix: line 50: kill: (19685) - No such process

because bsd readlink doesn't support -f like gnu coreutils readlink does.

[Thesola10]

Must have been an oversight, I did test the script on vanilla macOS before. Which version of macOS/Darwin did you test that on?

I struggle to find an alternative readily available.

[Thesola10]

readlink -f exists on macOS 12, what macOS version did you use?

[Thesola10]

What do you think of embedding realpath-lib into the generated Nixie script? I could have the builder prepend it to the generated script file.