the obvious answer would be something like this:
(ignore the atrocious error handling, it makes the code shorter)

...
let path = ...;
let canonical = path.canonicalize();

if path != canonical {
    panic!();
}

// the path can't contain symlinks as that would make it differ from canonical.
let file = File::open(path).unwrap();
let mut buffer = String::new();
file.read_to_string(&mut buffer).unwrap();
...

but that is fundementally flawed, some entry in path could be replaced by a symlink after the check, but before the file is opened and read.

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