debloat and reorganize code

split app into procd and init binaries
remove log support, this is an external service now

Signed-off-by: John Crispin <blogic@openwrt.org>

1 files changed, 98 insertions, 0 deletions

diff --git a/initd/preinit.c b/initd/preinit.c
new file mode 100644
index 0000000..eeadbeb
--- /dev/null
+++ b/initd/preinit.c
@@ -0,0 +1,98 @@
+/*
+ * Copyright (C) 2013 Felix Fietkau <nbd@openwrt.org>
+ * Copyright (C) 2013 John Crispin <blogic@openwrt.org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License version 2.1
+ * as published by the Free Software Foundation
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <sys/mount.h>
+
+#include <libubox/uloop.h>
+#include <libubox/utils.h>
+#include <libubus.h>
+
+#include <stdio.h>
+
+#include <unistd.h>
+
+#include "init.h"
+#include "../watchdog.h"
+
+static struct uloop_process preinit_proc;
+static struct uloop_process plugd_proc;
+
+static void
+spawn_procd(struct uloop_process *proc, int ret)
+{
+	char *wdt_fd = watchdog_fd();
+	char *argv[] = { "/sbin/procd", NULL };
+	struct stat s;
+
+	if (plugd_proc.pid > 0)
+		kill(plugd_proc.pid, SIGKILL);
+
+	if (!stat("/tmp/sysupgrade", &s))
+		while (true)
+			sleep(1);
+
+	unsetenv("INITRAMFS");
+	unsetenv("PREINIT");
+	DEBUG(2, "Exec to real procd now\n");
+	if (wdt_fd)
+		setenv("WDTFD", wdt_fd, 1);
+	execvp(argv[0], argv);
+}
+
+static void
+plugd_proc_cb(struct uloop_process *proc, int ret)
+{
+	proc->pid = 0;
+}
+
+void
+preinit(void)
+{
+	char *init[] = { "/bin/sh", "/etc/preinit", NULL };
+	char *plug[] = { "/sbin/procd", "-h", "/etc/hotplug-preinit.json", NULL };
+
+	LOG("- preinit -\n");
+
+	plugd_proc.cb = plugd_proc_cb;
+	plugd_proc.pid = fork();
+	if (!plugd_proc.pid) {
+		execvp(plug[0], plug);
+		ERROR("Failed to start plugd\n");
+		exit(-1);
+	}
+	if (plugd_proc.pid <= 0) {
+		ERROR("Failed to start new plugd instance\n");
+		return;
+	}
+	uloop_process_add(&plugd_proc);
+
+	setenv("PREINIT", "1", 1);
+
+	preinit_proc.cb = spawn_procd;
+	preinit_proc.pid = fork();
+	if (!preinit_proc.pid) {
+		execvp(init[0], init);
+		ERROR("Failed to start preinit\n");
+		exit(-1);
+	}
+	if (preinit_proc.pid <= 0) {
+		ERROR("Failed to start new preinit instance\n");
+		return;
+	}
+	uloop_process_add(&preinit_proc);
+
+	DEBUG(4, "Launched preinit instance, pid=%d\n", (int) preinit_proc.pid);
+}