update-mocks: prefer to find function defs from local includes.

This matters for:
	- common/wallet.h vs wallet/wallet.h
	- common/gossip_store.h vs gossipd/gossip_store.h
	- common/json.h vs lightningd/json.h
	- common/ping.h vs lightningd/ping.h

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

tools/mockup.sh

@@ -1,5 +1,13 @@
 #!/usr/bin/env bash
 
+if [ $# = 0 ]; then
+    echo 'Usage: mockup.sh <filename> [SYMBOLS...]' >&2
+    exit 1
+fi
+
+UPDIRNAME=$(dirname "$(dirname "$1")")
+shift
+
 if [ $# -eq 0 ]; then
     # With no args, read stdin to scrape compiler output.
     # shellcheck disable=SC2046
@@ -29,7 +37,8 @@ fi
 for SYMBOL; do
     # If there are multiple declarations, pick first (eg. common/memleak.h
     # has notleak_ as a declaration, and then an inline).
-    WHERE=$(grep -nH "^[a-zA-Z0-9_ (),]* [*]*$SYMBOL(" ./*/*.h | head -n1)
+    # Also, prefer local headers over generic ones.
+    WHERE=$(shopt -s nullglob; grep -nH "^[a-zA-Z0-9_ (),]* [*]*$SYMBOL(" "$UPDIRNAME"/*.h ./*/*.h | head -n1)
     if [ x"$WHERE" = x ]; then
 	echo "/* Could not find declaration for $SYMBOL */"
 	continue

tools/update-mocks.sh

@@ -30,7 +30,7 @@ if [ -n "$START" ]; then
 	if grep -q 'too many errors emitted.*-error-limit=0' "${BASE}.err"; then
 	    LDFLAGS=-Wl,-error-limit=0 make_binary || :
 	fi
-	tools/mockup.sh < "${BASE}.err" >> "${BASE}.stubs"
+	tools/mockup.sh "$FILE" < "${BASE}.err" >> "${BASE}.stubs"
 	# If there are no link errors, maybe compile fail for other reason?
 	if ! grep -F -q 'Generated stub for' "${BASE}.stubs"; then
 	    cat "${BASE}.err"