[PATCH v2 13/28] fsmonitor--daemon: implement daemon command options

["Jeff Hostetler via GitGitGadget" <gitgitgadget@gmail.com>]

From: Jeff Hostetler <jeffhost@microsoft.com>

Implement `run` and `start` commands to try to
begin listening for file system events.

This version defines the thread structure with a single
fsmonitor_fs_listen thread to watch for file system events
and a simple IPC thread pool to wait for connections from
Git clients over a well-known named pipe or Unix domain
socket.

This version does not actually do anything yet because the
backends are still just stubs.

Signed-off-by: Jeff Hostetler <jeffhost@microsoft.com>
---
 builtin/fsmonitor--daemon.c | 390 +++++++++++++++++++++++++++++++++++-
 fsmonitor--daemon.h         |  34 ++++
 2 files changed, 423 insertions(+), 1 deletion(-)
 create mode 100644 fsmonitor--daemon.h

diff --git a/builtin/fsmonitor--daemon.c b/builtin/fsmonitor--daemon.c
index 16ff68b65407..85f99dba861f 100644
--- a/builtin/fsmonitor--daemon.c
+++ b/builtin/fsmonitor--daemon.c
@@ -3,16 +3,52 @@
 #include "parse-options.h"
 #include "fsmonitor.h"
 #include "fsmonitor-ipc.h"
+#include "compat/fsmonitor/fsmonitor-fs-listen.h"
+#include "fsmonitor--daemon.h"
 #include "simple-ipc.h"
 #include "khash.h"
 
 static const char * const builtin_fsmonitor__daemon_usage[] = {
+	N_("git fsmonitor--daemon start [<options>]"),
+	N_("git fsmonitor--daemon run [<options>]"),
 	N_("git fsmonitor--daemon stop"),
 	N_("git fsmonitor--daemon status"),
 	NULL
 };
 
 #ifdef HAVE_FSMONITOR_DAEMON_BACKEND
+/*
+ * Global state loaded from config.
+ */
+#define FSMONITOR__IPC_THREADS "fsmonitor.ipcthreads"
+static int fsmonitor__ipc_threads = 8;
+
+#define FSMONITOR__START_TIMEOUT "fsmonitor.starttimeout"
+static int fsmonitor__start_timeout_sec = 60;
+
+static int fsmonitor_config(const char *var, const char *value, void *cb)
+{
+	if (!strcmp(var, FSMONITOR__IPC_THREADS)) {
+		int i = git_config_int(var, value);
+		if (i < 1)
+			return error(_("value of '%s' out of range: %d"),
+				     FSMONITOR__IPC_THREADS, i);
+		fsmonitor__ipc_threads = i;
+		return 0;
+	}
+
+	if (!strcmp(var, FSMONITOR__START_TIMEOUT)) {
+		int i = git_config_int(var, value);
+		if (i < 0)
+			return error(_("value of '%s' out of range: %d"),
+				     FSMONITOR__START_TIMEOUT, i);
+		fsmonitor__start_timeout_sec = i;
+		return 0;
+	}
+
+	return git_default_config(var, value, cb);
+}
+
 /*
  * Acting as a CLIENT.
  *
@@ -55,11 +91,354 @@ static int do_as_client__status(void)
 	}
 }
 
+static ipc_server_application_cb handle_client;
+
+static int handle_client(void *data,
+			 const char *command, size_t command_len,
+			 ipc_server_reply_cb *reply,
+			 struct ipc_server_reply_data *reply_data)
+{
+	/* struct fsmonitor_daemon_state *state = data; */
+	int result;
+
+	/*
+	 * The Simple IPC API now supports {char*, len} arguments, but
+	 * FSMonitor always uses proper null-terminated strings, so
+	 * we can ignore the command_len argument.  (Trust, but verify.)
+	 */
+	if (command_len != strlen(command))
+		BUG("FSMonitor assumes text messages");
+
+	trace2_region_enter("fsmonitor", "handle_client", the_repository);
+	trace2_data_string("fsmonitor", the_repository, "request", command);
+
+	result = 0; /* TODO Do something here. */
+
+	trace2_region_leave("fsmonitor", "handle_client", the_repository);
+
+	return result;
+}
+
+static void *fsmonitor_fs_listen__thread_proc(void *_state)
+{
+	struct fsmonitor_daemon_state *state = _state;
+
+	trace2_thread_start("fsm-listen");
+
+	trace_printf_key(&trace_fsmonitor, "Watching: worktree '%s'",
+			 state->path_worktree_watch.buf);
+	if (state->nr_paths_watching > 1)
+		trace_printf_key(&trace_fsmonitor, "Watching: gitdir '%s'",
+				 state->path_gitdir_watch.buf);
+
+	fsmonitor_fs_listen__loop(state);
+
+	trace2_thread_exit();
+	return NULL;
+}
+
+static int fsmonitor_run_daemon_1(struct fsmonitor_daemon_state *state)
+{
+	struct ipc_server_opts ipc_opts = {
+		.nr_threads = fsmonitor__ipc_threads,
+
+		/*
+		 * We know that there are no other active threads yet,
+		 * so we can let the IPC layer temporarily chdir() if
+		 * it needs to when creating the server side of the
+		 * Unix domain socket.
+		 */
+		.uds_disallow_chdir = 0
+	};
+
+	/*
+	 * Start the IPC thread pool before the we've started the file
+	 * system event listener thread so that we have the IPC handle
+	 * before we need it.
+	 */
+	if (ipc_server_run_async(&state->ipc_server_data,
+				 fsmonitor_ipc__get_path(), &ipc_opts,
+				 handle_client, state))
+		return error(_("could not start IPC thread pool"));
+
+	/*
+	 * Start the fsmonitor listener thread to collect filesystem
+	 * events.
+	 */
+	if (pthread_create(&state->listener_thread, NULL,
+			   fsmonitor_fs_listen__thread_proc, state) < 0) {
+		ipc_server_stop_async(state->ipc_server_data);
+		ipc_server_await(state->ipc_server_data);
+
+		return error(_("could not start fsmonitor listener thread"));
+	}
+
+	/*
+	 * The daemon is now fully functional in background threads.
+	 * Wait for the IPC thread pool to shutdown (whether by client
+	 * request or from filesystem activity).
+	 */
+	ipc_server_await(state->ipc_server_data);
+
+	/*
+	 * The fsmonitor listener thread may have received a shutdown
+	 * event from the IPC thread pool, but it doesn't hurt to tell
+	 * it again.  And wait for it to shutdown.
+	 */
+	fsmonitor_fs_listen__stop_async(state);
+	pthread_join(state->listener_thread, NULL);
+
+	return state->error_code;
+}
+
+static int fsmonitor_run_daemon(void)
+{
+	struct fsmonitor_daemon_state state;
+	int err;
+
+	memset(&state, 0, sizeof(state));
+
+	pthread_mutex_init(&state.main_lock, NULL);
+	state.error_code = 0;
+	state.current_token_data = NULL;
+
+	/* Prepare to (recursively) watch the <worktree-root> directory. */
+	strbuf_init(&state.path_worktree_watch, 0);
+	strbuf_addstr(&state.path_worktree_watch, absolute_path(get_git_work_tree()));
+	state.nr_paths_watching = 1;
+
+	/*
+	 * We create/delete cookie files inside the .git directory to
+	 * help us keep sync with the file system.  If ".git" is not a
+	 * directory, then <gitdir> is not inside the cone of
+	 * <worktree-root>, so set up a second watch for it.
+	 */
+	strbuf_init(&state.path_gitdir_watch, 0);
+	strbuf_addbuf(&state.path_gitdir_watch, &state.path_worktree_watch);
+	strbuf_addstr(&state.path_gitdir_watch, "/.git");
+	if (!is_directory(state.path_gitdir_watch.buf)) {
+		strbuf_reset(&state.path_gitdir_watch);
+		strbuf_addstr(&state.path_gitdir_watch, absolute_path(get_git_dir()));
+		state.nr_paths_watching = 2;
+	}
+
+	/*
+	 * Confirm that we can create platform-specific resources for the
+	 * filesystem listener before we bother starting all the threads.
+	 */
+	if (fsmonitor_fs_listen__ctor(&state)) {
+		err = error(_("could not initialize listener thread"));
+		goto done;
+	}
+
+	err = fsmonitor_run_daemon_1(&state);
+
+done:
+	pthread_mutex_destroy(&state.main_lock);
+	fsmonitor_fs_listen__dtor(&state);
+
+	ipc_server_free(state.ipc_server_data);
+
+	strbuf_release(&state.path_worktree_watch);
+	strbuf_release(&state.path_gitdir_watch);
+
+	return err;
+}
+
+static int try_to_run_foreground_daemon(void)
+{
+	/*
+	 * Technically, we don't need to probe for an existing daemon
+	 * process, since we could just call `fsmonitor_run_daemon()`
+	 * and let it fail if the pipe/socket is busy.
+	 *
+	 * However, this method gives us a nicer error message for a
+	 * common error case.
+	 */
+	if (fsmonitor_ipc__get_state() == IPC_STATE__LISTENING)
+		die("fsmonitor--daemon is already running.");
+
+	return !!fsmonitor_run_daemon();
+}
+
+#ifndef GIT_WINDOWS_NATIVE
+/*
+ * This is adapted from `daemonize()`.  Use `fork()` to directly create
+ * and run the daemon in a child process.  The fork-parent returns the
+ * child PID so that we can wait for the child to startup before exiting.
+ */
+static int spawn_background_fsmonitor_daemon(pid_t *pid)
+{
+	*pid = fork();
+
+	switch (*pid) {
+	case 0:
+		if (setsid() == -1)
+			error_errno(_("setsid failed"));
+		close(0);
+		close(1);
+		close(2);
+		sanitize_stdfds();
+
+		return !!fsmonitor_run_daemon();
+
+	case -1:
+		return error_errno(_("could not spawn fsmonitor--daemon in the background"));
+
+	default:
+		return 0;
+	}
+}
+#else
+/*
+ * Conceptually like `daemonize()` but different because Windows does not
+ * have `fork(2)`.  Spawn a normal Windows child process but without the
+ * limitations of `start_command()` and `finish_command()`.
+ */
+static int spawn_background_fsmonitor_daemon(pid_t *pid)
+{
+	char git_exe[MAX_PATH];
+	struct strvec args = STRVEC_INIT;
+	int in, out;
+
+	GetModuleFileNameA(NULL, git_exe, MAX_PATH);
+
+	in = open("/dev/null", O_RDONLY);
+	out = open("/dev/null", O_WRONLY);
+
+	strvec_push(&args, git_exe);
+	strvec_push(&args, "fsmonitor--daemon");
+	strvec_push(&args, "run");
+
+	*pid = mingw_spawnvpe(args.v[0], args.v, NULL, NULL, in, out, out);
+	close(in);
+	close(out);
+
+	strvec_clear(&args);
+
+	if (*pid < 0)
+		return error(_("could not spawn fsmonitor--daemon in the background"));
+
+	return 0;
+}
+#endif
+
+/*
+ * This is adapted from `wait_or_whine()`.  Watch the child process and
+ * let it get started and begin listening for requests on the socket
+ * before reporting our success.
+ */
+static int wait_for_background_startup(pid_t pid_child)
+{
+	int status;
+	pid_t pid_seen;
+	enum ipc_active_state s;
+	time_t time_limit, now;
+
+	time(&time_limit);
+	time_limit += fsmonitor__start_timeout_sec;
+
+	for (;;) {
+		pid_seen = waitpid(pid_child, &status, WNOHANG);
+
+		if (pid_seen == -1)
+			return error_errno(_("waitpid failed"));
+		else if (pid_seen == 0) {
+			/*
+			 * The child is still running (this should be
+			 * the normal case).  Try to connect to it on
+			 * the socket and see if it is ready for
+			 * business.
+			 *
+			 * If there is another daemon already running,
+			 * our child will fail to start (possibly
+			 * after a timeout on the lock), but we don't
+			 * care (who responds) if the socket is live.
+			 */
+			s = fsmonitor_ipc__get_state();
+			if (s == IPC_STATE__LISTENING)
+				return 0;
+
+			time(&now);
+			if (now > time_limit)
+				return error(_("fsmonitor--daemon not online yet"));
+		} else if (pid_seen == pid_child) {
+			/*
+			 * The new child daemon process shutdown while
+			 * it was starting up, so it is not listening
+			 * on the socket.
+			 *
+			 * Try to ping the socket in the odd chance
+			 * that another daemon started (or was already
+			 * running) while our child was starting.
+			 *
+			 * Again, we don't care who services the socket.
+			 */
+			s = fsmonitor_ipc__get_state();
+			if (s == IPC_STATE__LISTENING)
+				return 0;
+
+			/*
+			 * We don't care about the WEXITSTATUS() nor
+			 * any of the WIF*(status) values because
+			 * `cmd_fsmonitor__daemon()` does the `!!result`
+			 * trick on all function return values.
+			 *
+			 * So it is sufficient to just report the
+			 * early shutdown as an error.
+			 */
+			return error(_("fsmonitor--daemon failed to start"));
+		} else
+			return error(_("waitpid is confused"));
+	}
+}
+
+static int try_to_start_background_daemon(void)
+{
+	pid_t pid_child;
+	int ret;
+
+	/*
+	 * Before we try to create a background daemon process, see
+	 * if a daemon process is already listening.  This makes it
+	 * easier for us to report an already-listening error to the
+	 * console, since our spawn/daemon can only report the success
+	 * of creating the background process (and not whether it
+	 * immediately exited).
+	 */
+	if (fsmonitor_ipc__get_state() == IPC_STATE__LISTENING)
+		die("fsmonitor--daemon is already running.");
+
+	/*
+	 * Run the actual daemon in a background process.
+	 */
+	ret = spawn_background_fsmonitor_daemon(&pid_child);
+	if (pid_child <= 0)
+		return ret;
+
+	/*
+	 * Wait (with timeout) for the background child process get
+	 * started and begin listening on the socket/pipe.  This makes
+	 * the "start" command more synchronous and more reliable in
+	 * tests.
+	 */
+	ret = wait_for_background_startup(pid_child);
+
+	return ret;
+}
+
 int cmd_fsmonitor__daemon(int argc, const char **argv, const char *prefix)
 {
 	const char *subcmd;
 
 	struct option options[] = {
+		OPT_INTEGER(0, "ipc-threads",
+			    &fsmonitor__ipc_threads,
+			    N_("use <n> ipc worker threads")),
+		OPT_INTEGER(0, "start-timeout",
+			    &fsmonitor__start_timeout_sec,
+			    N_("Max seconds to wait for background daemon startup")),
+
 		OPT_END()
 	};
 
@@ -69,7 +448,7 @@ int cmd_fsmonitor__daemon(int argc, const char **argv, const char *prefix)
 	if (argc == 2 && !strcmp(argv[1], "-h"))
 		usage_with_options(builtin_fsmonitor__daemon_usage, options);
 
-	git_config(git_default_config, NULL);
+	git_config(fsmonitor_config, NULL);
 
 	subcmd = argv[1];
 	argv--;
@@ -77,6 +456,15 @@ int cmd_fsmonitor__daemon(int argc, const char **argv, const char *prefix)
 
 	argc = parse_options(argc, argv, prefix, options,
 			     builtin_fsmonitor__daemon_usage, 0);
+	if (fsmonitor__ipc_threads < 1)
+		die(_("invalid 'ipc-threads' value (%d)"),
+		    fsmonitor__ipc_threads);
+
+	if (!strcmp(subcmd, "start"))
+		return !!try_to_start_background_daemon();
+
+	if (!strcmp(subcmd, "run"))
+		return !!try_to_run_foreground_daemon();
 
 	if (!strcmp(subcmd, "stop"))
 		return !!do_as_client__send_stop();
diff --git a/fsmonitor--daemon.h b/fsmonitor--daemon.h
new file mode 100644
index 000000000000..3009c1a83de7
--- /dev/null
+++ b/fsmonitor--daemon.h
@@ -0,0 +1,34 @@
+#ifndef FSMONITOR_DAEMON_H
+#define FSMONITOR_DAEMON_H
+
+#ifdef HAVE_FSMONITOR_DAEMON_BACKEND
+
+#include "cache.h"
+#include "dir.h"
+#include "run-command.h"
+#include "simple-ipc.h"
+#include "thread-utils.h"
+
+struct fsmonitor_batch;
+struct fsmonitor_token_data;
+
+struct fsmonitor_daemon_backend_data; /* opaque platform-specific data */
+
+struct fsmonitor_daemon_state {
+	pthread_t listener_thread;
+	pthread_mutex_t main_lock;
+
+	struct strbuf path_worktree_watch;
+	struct strbuf path_gitdir_watch;
+	int nr_paths_watching;
+
+	struct fsmonitor_token_data *current_token_data;
+
+	int error_code;
+	struct fsmonitor_daemon_backend_data *backend_data;
+
+	struct ipc_server_data *ipc_server_data;
+};
+
+#endif /* HAVE_FSMONITOR_DAEMON_BACKEND */
+#endif /* FSMONITOR_DAEMON_H */
-- 
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