fs mkf subcommand

user/fs/main.c

@@ -3,6 +3,7 @@
 #include <ulib.h>
 
 extern void fs_fetch(void);
+extern void fs_mkf(void);
 
 void main(void) {
   if (argslen() == 0) {
@@ -13,6 +14,8 @@ void main(void) {
 
   if (string_strcmp(cmd, "fetch") == 0) {
     fs_fetch();
+  } else if (string_strcmp(cmd, "mkf") == 0) {
+    fs_mkf();
   } else {
     uprintf("fs: unknown command %s\n", cmd);
   }

user/fs/mkf.c

@@ -0,0 +1,36 @@
+#include <stddef.h>
+#include <stdint.h>
+#include <ulib.h>
+
+struct {
+  char *write;
+} FS_MKF_CONFIG = {
+  .write = NULL,
+};
+
+static Arg ARGS[] = {
+  ARG("-write", ARG_STRING, &FS_MKF_CONFIG.write),
+  ARG_END(),
+};
+
+void fs_mkf(void) {
+  if (argslen() < 2) {
+    uprintf("fs: Not enough arguments\n");
+    return;
+  }
+
+  char *path = *(args()+1);
+
+  int32_t ret;
+  if ((ret = parse_args(args()+2, argslen()-1, ARGS)) < 0) {
+    uprintf("fs mkf: Could not parse args: %d\n", ret);
+  }
+
+  IOH ioh = ioctl(IOCTL_NOHANDLE, IOCTL_OPENF, (uint64_t)path, IOCTL_F_MAKE | IOCTL_F_WRITE, 0);
+  if (FS_MKF_CONFIG.write != NULL) {
+    if (ioctl(ioh, IOCTL_WRITE, (uint64_t)FS_MKF_CONFIG.write, string_len(FS_MKF_CONFIG.write), 0) < 0) {
+      uprintf("fs mkf: could not write to %s\n", path);
+    }
+  }
+  ioctl(ioh, IOCTL_CLOSEF, 0, 0, 0);
+}