[PATCH 2/3] scalar unregister: stop FSMonitor daemon

["Johannes Schindelin via GitGitGadget" <gitgitgadget@gmail.com>]

From: Johannes Schindelin <johannes.schindelin@gmx.de>

Especially on Windows, we will need to stop that daemon, just in case
that the directory needs to be removed (the daemon would otherwise hold
a handle to that directory, preventing it from being deleted).

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Signed-off-by: Victoria Dye <vdye@github.com>
---
 contrib/scalar/scalar.c | 30 ++++++++++++++++++++++++++++++
 1 file changed, 30 insertions(+)

diff --git a/contrib/scalar/scalar.c b/contrib/scalar/scalar.c
index 219e414ab4e..b774eb044ec 100644
--- a/contrib/scalar/scalar.c
+++ b/contrib/scalar/scalar.c
@@ -272,6 +272,33 @@ static int start_fsmonitor_daemon(void)
 	return res;
 }
 
+static int stop_fsmonitor_daemon(void)
+{
+	int res = 0;
+	if (fsmonitor_ipc__is_supported()) {
+		struct strbuf err = STRBUF_INIT;
+		struct child_process cp = CHILD_PROCESS_INIT;
+
+		/* Try to stop the FSMonitor daemon */
+		cp.git_cmd = 1;
+		strvec_pushl(&cp.args, "fsmonitor--daemon", "stop", NULL);
+		if (!pipe_command(&cp, NULL, 0, NULL, 0, &err, 0)) {
+			/* Successfully stopped FSMonitor */
+			strbuf_release(&err);
+			return 0;
+		}
+
+		/* If FSMonitor really hasn't stopped, emit error */
+		if (fsmonitor_ipc__get_state() == IPC_STATE__LISTENING)
+			res = error(_("could not stop the FSMonitor daemon: %s"),
+				    err.buf);
+
+		strbuf_release(&err);
+	}
+
+	return res;
+}
+
 static int register_dir(void)
 {
 	int res = add_or_remove_enlistment(1);
@@ -298,6 +325,9 @@ static int unregister_dir(void)
 	if (add_or_remove_enlistment(0) < 0)
 		res = -1;
 
+	if (stop_fsmonitor_daemon() < 0)
+		res = -1;
+
 	return res;
 }
 
-- 
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