shell: add boot commands

Makefile

@@ -42,6 +42,7 @@ obj-y += source/ftl/gc.o
 obj-y += source/ftl/map.o
 
 obj-y += source/shell/args.o
+obj-y += source/shell/boot.o
 obj-y += source/shell/cmd.o
 obj-y += source/shell/echo.o
 obj-y += source/shell/flash.o

include/shell/boot.h

@@ -0,0 +1,6 @@
+#pragma once
+
+struct console;
+
+int shell_prepare(struct console *con, size_t argc, const char **argv);
+int shell_boot(struct console *con, size_t argc, const char **argv);

source/shell/boot.c

@@ -0,0 +1,65 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include <console.h>
+#include <macros.h>
+
+#include <fs/mufs.h>
+
+#include <shell/boot.h>
+
+extern struct mufs *mufs;
+
+int shell_prepare(struct console *con, size_t argc, const char **argv)
+{
+	char buf[256];
+	struct mufs_file *file;
+	size_t size, n;
+
+	if (argc < 1) {
+		fprintf(con->fp, "usage: booting <version>\n");
+		return -1;
+	}
+
+	if (!mufs) {
+		fprintf(con->fp, "error: no file system mounted.\n");
+		return -1;
+	}
+
+	if (!(file = mufs_open(mufs, "logs/boot.log", MUFS_WRITE | MUFS_APPEND))) {
+		fprintf(con->fp, "error: unable to open the file\n");
+		return -1;
+	}
+
+	n = min(strlen(argv[0]), sizeof(buf) - 2);
+
+	memcpy(buf, argv[0], n);
+	buf[n++] = '\n';
+	buf[n] = '\0';
+
+	size = mufs_write(file, buf, n);
+	mufs_close(file);
+
+	if (size < n) {
+		fprintf(con->fp, "error: unable to log the version to boot\n");
+		return -1;
+	}
+
+	return 0;
+}
+
+int shell_boot(struct console *con, size_t argc, const char **argv)
+{
+	(void)con;
+
+	if (argc < 1) {
+		fprintf(con->fp, "usage: booting ok\n");
+		return -1;
+	}
+
+	if (strcmp(argv[0], "ok") != 0)
+		return -1;
+
+	return 0;
+}