fsmonitor--daemon: add a built-in fsmonitor daemon

Create a built-in file system monitoring daemon that can be used by
the existing `fsmonitor` feature (protocol API and index extension)
to improve the performance of various Git commands, such as `status`.

The `fsmonitor--daemon` feature builds upon the `Simple IPC` API and
provides an alternative to hook access to existing fsmonitors such
as `watchman`.

This commit merely adds the new command without any functionality.

Co-authored-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Signed-off-by: Jeff Hostetler <jeffhost@microsoft.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

1 files changed, 46 insertions, 0 deletions

diff --git a/builtin/fsmonitor--daemon.c b/builtin/fsmonitor--daemon.c
new file mode 100644
index 0000000000..f049879337
--- /dev/null
+++ b/builtin/fsmonitor--daemon.c
@@ -0,0 +1,46 @@
+#include "builtin.h"
+#include "config.h"
+#include "parse-options.h"
+#include "fsmonitor.h"
+#include "fsmonitor-ipc.h"
+#include "simple-ipc.h"
+#include "khash.h"
+
+static const char * const builtin_fsmonitor__daemon_usage[] = {
+	NULL
+};
+
+#ifdef HAVE_FSMONITOR_DAEMON_BACKEND
+
+int cmd_fsmonitor__daemon(int argc, const char **argv, const char *prefix)
+{
+	const char *subcmd;
+
+	struct option options[] = {
+		OPT_END()
+	};
+
+	git_config(git_default_config, NULL);
+
+	argc = parse_options(argc, argv, prefix, options,
+			     builtin_fsmonitor__daemon_usage, 0);
+	if (argc != 1)
+		usage_with_options(builtin_fsmonitor__daemon_usage, options);
+	subcmd = argv[0];
+
+	die(_("Unhandled subcommand '%s'"), subcmd);
+}
+
+#else
+int cmd_fsmonitor__daemon(int argc, const char **argv, const char *prefix)
+{
+	struct option options[] = {
+		OPT_END()
+	};
+
+	if (argc == 2 && !strcmp(argv[1], "-h"))
+		usage_with_options(builtin_fsmonitor__daemon_usage, options);
+
+	die(_("fsmonitor--daemon not supported on this platform"));
+}
+#endif