fs Disk formatting subcommand

base/scripts/fmtdisk.tb

@@ -0,0 +1 @@
+$fs fmt -dev $0 -fs $1

user/fs/fmt.c

@@ -0,0 +1,36 @@
+#include <stdint.h>
+#include <stddef.h>
+#include <ulib.h>
+
+struct {
+  char *devname;
+  char *fstype;
+} FS_FMT_CONFIG = {0};
+
+static Arg ARGS[] = {
+  ARG("-dev", ARG_STRING, &FS_FMT_CONFIG.devname),
+  ARG("-fs", ARG_STRING, &FS_FMT_CONFIG.fstype),
+  ARG_END(),
+};
+
+void fs_fmt(void) {
+  int32_t ret;
+  if ((ret = parse_args(args()+1, argslen()-1, ARGS)) < 0) {
+    uprintf("fs fmt: Could not parse args: %d\n", ret);
+  }
+
+  Dev_t dev;
+  ret = dev_gethandle(&dev, FS_FMT_CONFIG.devname);
+  if (ret != E_OK) {
+    uprintf("fs: device %s not found\n", FS_FMT_CONFIG.devname);
+    return;
+  }
+
+  ret = vfsmount("fmt-dummy", FS_FMT_CONFIG.fstype, &dev, true);
+  if (ret != E_OK) {
+    uprintf("fs: mount error %s\n", ERRSTRING(ret));
+    return;
+  }
+
+  /* vfsunmount("fmt-dummy"); */
+}

user/fs/main.c

@@ -4,7 +4,8 @@
 
 #define CMDS(X)                     \
   X(fetch)    X(mkf)    X(mkd)      \
-  X(tree)     X(mount)  X(del)
+  X(tree)     X(mount)  X(del)      \
+  X(fmt)
 
 void main(void) {
   if (argslen() == 0) {