gnu: patch inotify-race tests to use Rust gdb breakpoints (#9908)

Author: ChrisDryden

util/build-gnu.sh

@@ -216,6 +216,17 @@ sed -i -e "s|rm: cannot remove 'a/1': Permission denied|rm: cannot remove 'a/1/2
 # however there's a bug because `---dis` is an alias for: `---disable-inotify`
 sed -i -e "s|---dis ||g" tests/tail/overlay-headers.sh
 
+# Patch inotify-race tests to use Rust source lines for gdb breakpoints.
+# GNU test checks for race between initial read and watch setup. Rust sets up
+# watchers before initial read, so no exact equivalent exists. We break at
+# watch_with_parent as the closest semantic match. -iex suppresses Rust debug
+# script auto-load warnings that would cause the test to skip.
+"${SED}" -i \
+    -e "s|break_src=\"\$abs_top_srcdir/src/tail.c\"|break_src=\"${path_UUTILS}/src/uu/tail/src/follow/watch.rs\"|" \
+    -e 's|break_line=$(grep -n ^tail_forever_inotify "$break_src")|break_line=$(grep -n "watcher_rx.watch_with_parent" "$break_src")|' \
+    -e 's|gdb -nx --batch-silent|gdb -nx --batch-silent -iex "set auto-load no"|g' \
+    tests/tail/inotify-race.sh tests/tail/inotify-race2.sh
+
 # Do not FAIL, just do a regular ERROR
 sed -i -e "s|framework_failure_ 'no inotify_add_watch';|fail=1;|" tests/tail/inotify-rotate-resources.sh