From 642b5fb0007b64c77d186fcb018d571152ee1d47 Mon Sep 17 00:00:00 2001
From: dzwdz
Date: Mon, 14 Aug 2023 18:51:07 +0200
Subject: reorganization: first steps

---
 src/cmd/init/init.c | 151 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 151 insertions(+)
 create mode 100644 src/cmd/init/init.c

(limited to 'src/cmd/init/init.c')

diff --git a/src/cmd/init/init.c b/src/cmd/init/init.c
new file mode 100644
index 0000000..fcebfc7
--- /dev/null
+++ b/src/cmd/init/init.c
@@ -0,0 +1,151 @@
+#include "driver/driver.h"
+#include <camellia/flags.h>
+#include <camellia/syscalls.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <string.h>
+#include <unistd.h>
+#include <camellia/fs/misc.h>
+
+#define die(fmt, ...) do { fprintf(stderr, "init: " fmt, __VA_ARGS__); exit(1); } while (0)
+
+static char title[128];
+
+void redirect(const char *exe, const char *out, const char *in) {
+	if (!fork()) {
+		snprintf(title, sizeof title, "sh >%s", out);
+		setproctitle(title);
+
+		if (!freopen(out, "a+", stderr)) {
+			fprintf(stdout, "couldn't open %s\n", out);
+			exit(1);
+		}
+		if (!freopen(out, "a+", stdout))
+			die("couldn't open %s\n", out);
+		if (!freopen(in, "r", stdin))
+			die(" couldn't open %s\n", in);
+
+		for (;;) {
+			if (!fork()) {
+				const char *argv[] = {exe, NULL};
+				termcook();
+				execv(exe, (void*)argv);
+				fprintf(stderr, "init: couldn't start %s\n", exe);
+				_sys_sleep(5000);
+				exit(1);
+			}
+			_sys_await();
+			_sys_intr();
+		}
+	}
+}
+
+int main(void) {
+	const char *teststr = "I am teststr.\n";
+	hid_t killswitch_pipe[2];
+
+	freopen("/kdev/com1", "a+", stdout);
+	freopen("/kdev/com1", "a+", stderr);
+	printf("[init] stage 2, main at %p, teststr at %p\n", &main, teststr);
+
+	MOUNT_AT("/") {
+		fs_dirinject2((const char*[]){
+			"/keyboard/",
+			"/usr/",
+			"/bin/",
+			"/Users/",
+			"/tmp/",
+			"/vtty",
+			"/net/",
+			"/initctl",
+			NULL
+		});
+	}
+
+	MOUNT_AT("/keyboard") {
+		MOUNT_AT("/") { fs_whitelist((const char*[]){"/kdev/ps2/kb", NULL}); }
+		ps2_drv();
+	}
+	MOUNT_AT("/usr/") {
+		fs_union((const char*[]){
+			"/init/usr/",
+			NULL
+		});
+	}
+	MOUNT_AT("/bin/") {
+		fs_union((const char*[]){
+			"/init/bin/amd64/",
+			"/init/bin/sh/",
+			"/init/usr/bin/",
+			"/init/usr/local/bin/",
+			NULL
+		});
+	}
+	MOUNT_AT("/Users/") {
+		MOUNT_AT("/tmp/") {
+			const char *argv[] = {"/bin/tmpfs", NULL};
+			execv(argv[0], (void*)argv);
+		}
+		// TODO a simple union isn't enough here
+		fs_union((const char*[]){
+			"/tmp/",
+			"/init/Users/",
+			NULL
+		});
+	}
+	MOUNT_AT("/tmp/") {
+		const char *allow[] = {"/bin/tmpfs", NULL};
+		const char *argv[] = {"/bin/tmpfs", NULL};
+		MOUNT_AT("/") { fs_whitelist(allow); }
+		execv(argv[0], (void*)argv);
+	}
+	MOUNT_AT("/vtty") {
+		const char *allow[] = {"/bin/vterm", "/kdev/video/", "/keyboard", "/init/usr/share/fonts/", NULL};
+		const char *argv[] = {"/bin/vterm", NULL};
+		MOUNT_AT("/") { fs_whitelist(allow); }
+		execv(argv[0], (void*)argv);
+	}
+	MOUNT_AT("/net/") {
+		const char *allow[] = {"/bin/netstack", "/kdev/eth", NULL};
+		const char *argv[] = {"/bin/netstack", "/kdev/eth", "192.168.0.11", "192.168.0.2", NULL};
+		MOUNT_AT("/") { fs_whitelist(allow); }
+		execv(argv[0], (void*)argv);
+	}
+
+	if (_sys_pipe(killswitch_pipe, 0) < 0) {
+		printf("couldn't create the killswitch pipe, quitting...\n");
+		return 1;
+	}
+	MOUNT_AT("/initctl") {
+		close(killswitch_pipe[0]);
+		initctl_drv(killswitch_pipe[1]);
+	}
+	close(killswitch_pipe[1]);
+
+	if (!fork()) {
+		// TODO close on exec
+		close(killswitch_pipe[0]);
+		redirect("/bin/shell", "/kdev/com1", "/kdev/com1");
+		redirect("/bin/shell", "/vtty", "/keyboard");
+		exit(1);
+	}
+
+	char buf[128];
+	for (;;) {
+		if (_sys_read(killswitch_pipe[0], buf, 128, 0) != 4) {
+			break;
+		}
+		if (memcmp(buf, "intr", 4) == 0) {
+			_sys_intr();
+		} else if (memcmp(buf, "halt", 4) == 0) {
+			break;
+		}
+	}
+	printf("[init] intr\n");
+	_sys_intr();
+	_sys_sleep(1000);
+	printf("[init] filicide\n");
+	_sys_filicide();
+	printf("[init] goodbye\n");
+	return 0;
+}
-- 
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