extmod/vfs_lfs: Support mounting LFS filesystems in read-only mode.
Signed-off-by: Damien George <damien@micropython.org>
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@ -423,10 +423,16 @@ STATIC mp_obj_t MP_VFS_LFSx(statvfs)(mp_obj_t self_in, mp_obj_t path_in) {
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STATIC MP_DEFINE_CONST_FUN_OBJ_2(MP_VFS_LFSx(statvfs_obj), MP_VFS_LFSx(statvfs));
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STATIC mp_obj_t MP_VFS_LFSx(mount)(mp_obj_t self_in, mp_obj_t readonly, mp_obj_t mkfs) {
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(void)self_in;
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(void)readonly;
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MP_OBJ_VFS_LFSx *self = MP_OBJ_TO_PTR(self_in);
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(void)mkfs;
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// already called LFSx_API(mount) in MP_VFS_LFSx(make_new)
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// Make block device read-only if requested.
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if (mp_obj_is_true(readonly)) {
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self->blockdev.writeblocks[0] = MP_OBJ_NULL;
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}
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// Already called LFSx_API(mount) in MP_VFS_LFSx(make_new) so the filesystem is ready.
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return mp_const_none;
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}
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STATIC MP_DEFINE_CONST_FUN_OBJ_3(MP_VFS_LFSx(mount_obj), MP_VFS_LFSx(mount));
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@ -67,6 +67,23 @@ def test(bdev, vfs_class):
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# umount
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uos.umount("/lfs")
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# mount read-only
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vfs = vfs_class(bdev)
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uos.mount(vfs, "/lfs", readonly=True)
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# test reading works
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with open("/lfs/subdir/lfsmod2.py") as f:
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print("lfsmod2.py:", f.read())
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# test writing fails
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try:
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open("/lfs/test_write", "w")
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except OSError as er:
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print(repr(er))
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# umount
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uos.umount("/lfs")
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# clear imported modules
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usys.modules.clear()
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@ -2,7 +2,13 @@ test <class 'VfsLfs1'>
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hello from lfs
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package
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hello from lfs
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lfsmod2.py: print("hello from lfs")
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OSError(30,)
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test <class 'VfsLfs2'>
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hello from lfs
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package
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hello from lfs
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lfsmod2.py: print("hello from lfs")
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OSError(36,)
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