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extmod/vfs: Allow to mount a block device, not just a VFS object.

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If the mounted object doesn't have a "mount" method then assume it's a
block device and try to detect the filesystem.  Since we currently only
support FAT filesystems, the behaviour is to just try and create a VfsFat
object automatically, using the given block device.
This commit is contained in:
Damien George 2017-02-09 12:03:12 +11:00
parent 181f7d1450
commit ec7dc7f8d7
1 changed files with 14 additions and 1 deletions
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15
extmod/vfs.c
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@ -132,11 +132,24 @@ mp_obj_t mp_vfs_mount(size_t n_args, const mp_obj_t *pos_args, mp_map_t *kw_args
mp_uint_t mnt_len;
const char *mnt_str = mp_obj_str_get_data(pos_args[1], &mnt_len);
// see if we need to auto-detect and create the filesystem
mp_obj_t vfs_obj = pos_args[0];
mp_obj_t dest[2];
mp_load_method_maybe(vfs_obj, MP_QSTR_mount, dest);
if (dest[0] == MP_OBJ_NULL) {
// Input object has no mount method, assume it's a block device and try to
// auto-detect the filesystem and create the corresponding VFS entity.
// (At the moment we only support FAT filesystems.)
#if MICROPY_VFS_FAT
vfs_obj = mp_fat_vfs_type.make_new(&mp_fat_vfs_type, 1, 0, &vfs_obj);
#endif
}
// create new object
mp_vfs_mount_t *vfs = m_new_obj(mp_vfs_mount_t);
vfs->str = mnt_str;
vfs->len = mnt_len;
vfs->obj = pos_args[0];
vfs->obj = vfs_obj;
vfs->next = NULL;
// call the underlying object to do any mounting operation