[master] f8856377b param: Present alias names to tweaks

[Dridi Boukelmoune]

commit f8856377b4f89c2ed1f5acf53a6dc53855744138
Author: Dridi Boukelmoune <dridi.boukelmoune at gmail.com>
Date:   Tue May 31 07:59:17 2022 +0200

    param: Present alias names to tweaks
    
    Instead of simply resolving the original parameter and passing it on
    pristine to its tweak, build an intermediary param spec that has all
    the properties of the original with the name of the alias.
    
    This enables special handling of deprecated aliases with their
    replacements.

diff --git a/bin/varnishd/mgt/mgt_param_tweak.c b/bin/varnishd/mgt/mgt_param_tweak.c
index 6f0e26803..cba614415 100644
--- a/bin/varnishd/mgt/mgt_param_tweak.c
+++ b/bin/varnishd/mgt/mgt_param_tweak.c
@@ -565,9 +565,15 @@ tweak_storage(struct vsb *vsb, const struct parspec *par, const char *arg)
 int v_matchproto_(tweak_t)
 tweak_alias(struct vsb *vsb, const struct parspec *par, const char *arg)
 {
-
-	par = TRUST_ME(par->priv);
-	return (par->func(vsb, par, arg));
+	const struct parspec *orig;
+	struct parspec alias[1];
+
+	orig = TRUST_ME(par->priv);
+	AN(orig);
+	memcpy(alias, orig, sizeof *orig);
+	alias->name = par->name;
+	alias->priv = TRUST_ME(orig);
+	return (alias->func(vsb, alias, arg));
 }
 
 /*--------------------------------------------------------------------