pub fn ensure_devp_alias()Expand description
Create the devp executable alias next to dev-prune, and keep it current.
Runs on every invocation because it is two stat calls in the settled case, and
because the alias is how most people invoke this tool — it must never be the stale
half of an upgrade.
DEV_PRUNE_NO_AUTO_SETUP suppresses it, because writing a second executable next to
the first is a self-installation like any other. devp setup still creates the alias
when the variable is set: the variable governs the unattended pass, not the explicit
request.