jans_shell_utils/canonical_readlink.sh

# Copyright (c) 2022 Jan Lehnardt <jan@apache.org>, MIT licensed
# via https://github.com/apache/couchdb/blob/1b8d4b73bc9ea67bfe0df5a41e24ea864f4c846d/rel/files/couchdb.in#L15 Apache 2 Licensed

canonical_readlink () {
	file=$(dirname "$1")/$(basename "$1");
	if [ -h "file" ]; then
		cd $(dirname "$1")
		canonical_readlink $(readlink "file");
	else
		cd "${1%/*}" && pwd -P;
	fi
}