The wrapper doesn't work on macOS

[morozov]

readlink: illegal option -- f
usage: readlink [-n] [file ...]
usage: dirname path
readlink: illegal option -- f
usage: readlink [-n] [file ...]

Unlike GNU readlink where -f is:

       -f, --canonicalize
              canonicalize  by  following  every symlink in every component of the given name
              recursively; all but the last component must exist

In BSD readlink it's:

     -f format
             Display information using the specified format.  See the FORMATS section
             for a description of valid formats.

The dirname error is a side effect of that since readlink called on a non-link results in an empty string passed to dirname.

The wrapper would be more robust if it used set -e and quoted all variables:

set -e

PREPEND="$(readlink -f -- "$(dirname "$(readlink -f -- "$0")")/../src/prepend.php")"

Then at least it wouldn't try to call dirname with an empty value which is the result of the error in the subshell.

[weirdan]

I think it makes sense to use PHP instead. If it's not available the script won't work anyway.

[weirdan]

Something like

PREPEND="$(php -n -r 'echo realpath(dirname(realpath($argv[1])) . "/../src/prepend.php");' -- "$0")"

should do the trick I suppose.

[weirdan]

Fixed in 1.6.0.