3 files changed, 47 insertions, 8 deletions
diff --git a/builtin/fsmonitor--daemon.c b/builtin/fsmonitor--daemon.c
index 66b78a0353..db297649da 100644
--- a/builtin/fsmonitor--daemon.c
+++ b/builtin/fsmonitor--daemon.c
@@ -1181,11 +1181,11 @@ static int fsmonitor_run_daemon_1(struct fsmonitor_daemon_state *state)
 	 * before we need it.
 	 */
 	if (ipc_server_run_async(&state->ipc_server_data,
-				 fsmonitor_ipc__get_path(), &ipc_opts,
+				 state->path_ipc.buf, &ipc_opts,
 				 handle_client, state))
 		return error_errno(
 			_("could not start IPC thread pool on '%s'"),
-			fsmonitor_ipc__get_path());
+			state->path_ipc.buf);
 
 	/*
 	 * Start the fsmonitor listener thread to collect filesystem
@@ -1220,6 +1220,7 @@ static int fsmonitor_run_daemon_1(struct fsmonitor_daemon_state *state)
 static int fsmonitor_run_daemon(void)
 {
 	struct fsmonitor_daemon_state state;
+	const char *home;
 	int err;
 
 	memset(&state, 0, sizeof(state));
@@ -1290,6 +1291,15 @@ static int fsmonitor_run_daemon(void)
 	strbuf_addch(&state.path_cookie_prefix, '/');
 
 	/*
+	 * We create a named-pipe or unix domain socket inside of the
+	 * ".git" directory.  (Well, on Windows, we base our named
+	 * pipe in the NPFS on the absolute path of the git
+	 * directory.)
+	 */
+	strbuf_init(&state.path_ipc, 0);
+	strbuf_addstr(&state.path_ipc, absolute_path(fsmonitor_ipc__get_path()));
+
+	/*
 	 * Confirm that we can create platform-specific resources for the
 	 * filesystem listener before we bother starting all the threads.
 	 */
@@ -1298,6 +1308,23 @@ static int fsmonitor_run_daemon(void)
 		goto done;
 	}
 
+	/*
+	 * CD out of the worktree root directory.
+	 *
+	 * The common Git startup mechanism causes our CWD to be the
+	 * root of the worktree.  On Windows, this causes our process
+	 * to hold a locked handle on the CWD.  This prevents the
+	 * worktree from being moved or deleted while the daemon is
+	 * running.
+	 *
+	 * We assume that our FS and IPC listener threads have either
+	 * opened all of the handles that they need or will do
+	 * everything using absolute paths.
+	 */
+	home = getenv("HOME");
+	if (home && *home && chdir(home))
+		die_errno(_("could not cd home '%s'"), home);
+
 	err = fsmonitor_run_daemon_1(&state);
 
 done:
@@ -1310,6 +1337,7 @@ done:
 	strbuf_release(&state.path_worktree_watch);
 	strbuf_release(&state.path_gitdir_watch);
 	strbuf_release(&state.path_cookie_prefix);
+	strbuf_release(&state.path_ipc);
 
 	return err;
 }
diff --git a/compat/fsmonitor/fsm-listen-win32.c b/compat/fsmonitor/fsm-listen-win32.c
index 4f46bd1d0a..35f2fb9578 100644
--- a/compat/fsmonitor/fsm-listen-win32.c
+++ b/compat/fsmonitor/fsm-listen-win32.c
@@ -424,12 +424,22 @@ static int recv_rdcw_watch(struct one_watch *watch)
 	}
 
 	/*
-	 * NEEDSWORK: If an external <gitdir> is deleted, the above
-	 * returns an error.  I'm not sure that there's anything that
-	 * we can do here other than failing -- the <worktree>/.git
-	 * link file would be broken anyway.  We might try to check
-	 * for that and return a better error message, but I'm not
-	 * sure it is worth it.
+	 * GetOverlappedResult() fails if the watched directory is
+	 * deleted while we were waiting for an overlapped IO to
+	 * complete.  The documentation did not list specific errors,
+	 * but I observed ERROR_ACCESS_DENIED (0x05) errors during
+	 * testing.
+	 *
+	 * Note that we only get notificaiton events for events
+	 * *within* the directory, not *on* the directory itself.
+	 * (These might be properies of the parent directory, for
+	 * example).
+	 *
+	 * NEEDSWORK: We might try to check for the deleted directory
+	 * case and return a better error message, but I'm not sure it
+	 * is worth it.
+	 *
+	 * Shutdown if we get any error.
 	 */
 
 	error(_("GetOverlappedResult failed on '%s' [GLE %ld]"),
diff --git a/fsmonitor--daemon.h b/fsmonitor--daemon.h
index bd09fffc17..223c2131b5 100644
--- a/fsmonitor--daemon.h
+++ b/fsmonitor--daemon.h
@@ -54,6 +54,7 @@ struct fsmonitor_daemon_state {
 	struct fsmonitor_daemon_backend_data *backend_data;
 
 	struct ipc_server_data *ipc_server_data;
+	struct strbuf path_ipc;
 };
 
 /*