Wrapper uses readlink -f which is not supported on all versions of macOS

[johnsonjh]

The eatmydata wrapper uses readlink -f which is not supported on all versions of macOS - the simplest workaround is to use readlink from coreutils.

I will take a look further at the usage in the script and see if an alternative that does not require any dependencies could be possible unless someone beats me to it.

[johnsonjh]

I don't know the exact versions where -f is supported, but the failure noted was from Homebrew's CI on ARM64 macOS 11.

[johnsonjh]

Perhaps realpath -e would work here.

As with readlink, since this is non-POSIX, I'd need to check if it's widely supported ...

[jjwatt]

FYI, http://mywiki.wooledge.org/BashFAQ/029

tl;dr: You can use perl:

perl -le 'print readlink "/bin/sh"'

or find with printf %l:

$ find /bin/ -type l -printf '%p points to %l\n'
/bin/sh points to bash
/bin/bunzip2 points to bzip2

or write a custom function (that is a little gnarly--see the link for it).