fix canonical component artifact identity

docs/wasm-runtime-architecture.md

@@ -396,7 +396,9 @@ header free-functions are `inline`. The wasm backend exposes only declarations
   child and again with that child activated. This guards the component-slot
   cache invariant that a cache hit must restore both the function-table slot
   and the resolved unit path; otherwise nested relative targets resolve from
-  the caller after a repeated parent invocation.
+  the caller after a repeated parent invocation. Resolved component paths are
+  canonical absolute paths: equivalent spellings containing `.` or `..` must
+  share one source, compile, artifact, and module-cache identity.
 
 - **WebSocket end-to-end**: a headless client performs a raw WS handshake to
   `:HTTP_PORT` with path `/site/tests/websockets.ws.uce` (self-resolving

site/tests/components.uce

@@ -27,6 +27,8 @@ RENDER(Request& context)
 	String lazy_first = component("components/lazy-parent", lazy_props, context);
 	lazy_props["show_child"].set_bool(true);
 	String lazy_second = component("components/lazy-parent", lazy_props, context);
+	String relative_resolved = component_resolve("components/../relative-child");
+	String relative_markup = component("components/../relative-child", props, context);
 	String alias_markup = component("components/props_alias", props, context);
 	// Named handler through the string-returning component("unit:NAME") form
 	// (distinct path from component_render below): resolves __uce_component_HEADER
@@ -47,6 +49,8 @@ RENDER(Request& context)
 	check("component_resolve()", resolved != "", resolved);
 	check("component()", panel_markup.find("Component Output") != String::npos && panel_markup.find("This body comes from component()") != String::npos, panel_markup);
 	check("cached component retains path for a newly activated relative child", lazy_first.find("lazy-child") == String::npos && lazy_second.find("lazy-child") != String::npos, lazy_second);
+	check("relative component path has canonical identity", relative_resolved.find("/../") == String::npos && str_ends_with(relative_resolved, "/site/tests/relative-child.uce"), relative_resolved);
+	check("relative component path renders its canonical artifact", relative_markup.find("relative-child") != String::npos, relative_markup);
 	check("COMPONENT(Request& props) alias", alias_markup.find("alias=Component Output") != String::npos && alias_markup.find("body=This body comes from component()") != String::npos, alias_markup);
 	check("component_render() named handler", footer_markup.find("Named footer render") != String::npos, footer_markup);
 	check("component(\"unit:NAME\") named handler", header_markup.find("Component Output") != String::npos && header_markup.find("This body comes from component()") == String::npos, header_markup);

site/tests/relative-child.uce

@@ -0,0 +1,6 @@
+#include "testlib.h"
+
+COMPONENT(Request& context)
+{
+	?><span>relative-child</span><?
+}

src/wasm/worker.cpp

@@ -1455,8 +1455,13 @@ private:
 				candidates.push_back(base + "components/" + normalize_component_path(file_name));
 			}
 			for(auto& candidate : candidates)
-				if(file_exists_host(candidate))
-					return(candidate);
+			{
+				if(!file_exists_host(candidate))
+					continue;
+				char resolved[PATH_MAX];
+				if(realpath(candidate.c_str(), resolved))
+					return(String(resolved));
+			}
 		}
 		return("");
 	}