def from_cffi(cls: t.Type[T], struct) -> T:
return cls(
nodeid=struct.nodeid,
generation=struct.generation,
entry_valid=Timespec(struct.entry_valid, struct.entry_valid_nsec),
attr_valid=Timespec(struct.attr_valid, struct.attr_valid_nsec),
attr=FuseAttr.from_cffi(struct.attr),
)
def from_cffi(cls: t.Type[T], struct) -> T:
return cls(
ino=struct.ino,
size=struct.size,
blocks=struct.blocks,
atime=Timespec(sec=struct.atime, nsec=struct.atimensec),
mtime=Timespec(sec=struct.mtime, nsec=struct.mtimensec),
ctime=Timespec(sec=struct.ctime, nsec=struct.ctimensec),
mode=struct.mode,
nlink=struct.nlink,
uid=struct.uid,
gid=struct.gid,
rdev=struct.rdev,
blksize=struct.blksize,
)
def from_bytes(cls: t.Type[T], data: bytes) -> T:
struct = ffi.cast('struct stat*', ffi.from_buffer(data))
return cls(
dev=struct.st_dev,
ino=struct.st_ino,
mode=struct.st_mode,
nlink=struct.st_nlink,
uid=struct.st_uid,
gid=struct.st_gid,
rdev=struct.st_rdev,
size=struct.st_size,
blksize=struct.st_blksize,
blocks=struct.st_blocks,
atime=Timespec.from_cffi(struct.st_atim),
mtime=Timespec.from_cffi(struct.st_mtim),
ctime=Timespec.from_cffi(struct.st_ctim),
)
def test_stat(self) -> None:
initial = Stat(
dev=0,
ino=0,
mode=TypeMode(S_IF.REG, Mode(0o777)),
nlink=0,
uid=0,
gid=0,
rdev=0,
size=0,
blksize=0,
blocks=0,
atime=Timespec(sec=0, nsec=0),
mtime=Timespec(sec=0, nsec=0),
ctime=Timespec(sec=0, nsec=0),
)
output = Stat.from_bytes(initial.to_bytes())
self.assertEqual(initial, output)
async def test_symlink(self) -> None:
@self.nursery.start_soon
async def open() -> None:
async with (await self.child.task.open(
await self.process.ptr(self.path / "foo"),
O.RDONLY)) as foo:
data, _ = await foo.read(await
self.process.malloc(bytes, 4096))
await self.fuse.write((await self.assertRead(FuseGetattrOp)).respond(
FuseAttrOut(attr_valid=Timespec(10000, 0),
attr=FuseAttr(ino=1,
size=0,
blocks=1,
atime=Timespec(0, 0),
mtime=Timespec(0, 0),
ctime=Timespec(0, 0),
mode=TypeMode(S_IF.DIR, Mode(0o777)),
nlink=1,
uid=self.fuse.uid,
gid=self.fuse.gid,
rdev=0,
blksize=4096))))
await self.fuse.write((await self.assertRead(FuseLookupOp)).respond(
FuseEntryOut(
nodeid=2,
generation=1,
entry_valid=Timespec(10000, 0),
attr_valid=Timespec(10000, 0),
# the size needs to be consistent with the data we'll actually send back on read
# the kernel, I guess, handles delivering an eof;
# we can just claim a larger size then send back less data
attr=FuseAttr(ino=999,
size=4096,
blocks=1,
atime=Timespec(0, 0),
mtime=Timespec(0, 0),
ctime=Timespec(0, 0),
mode=TypeMode(S_IF.LNK, Mode(0o777)),
nlink=1,
uid=self.fuse.uid,
gid=self.fuse.gid,
rdev=0,
blksize=4096))))
await self.fuse.write(
(await self.assertRead(FuseReadlinkOp)).respond("/bin/sh"))
async def test_basic(self) -> None:
data_read_from_fuse = b"this is some data read from fuse"
@self.nursery.start_soon
async def open() -> None:
foo = await self.child.task.open(
await self.child.ptr(self.path / "foo"), O.RDONLY)
data, _ = await foo.read(await self.child.malloc(bytes, 4096))
self.assertEqual(data_read_from_fuse, await data.read())
data, _ = await foo.read(await self.child.malloc(bytes, 4096))
self.assertEqual(data.size(), 0)
await foo.close()
root = await self.child.task.open(await self.child.ptr(self.path),
O.RDONLY)
valid, rest = await root.getdents(await self.child.ram.malloc(
DirentList, 4096))
await root.close()
root_getattr = await self.assertRead(FuseGetattrOp)
if root_getattr.hdr.nodeid != 1:
raise Exception("expected to get getattr for root node 1, not",
root_getattr.hdr.nodeid)
await self.fuse.write(
root_getattr.respond(
FuseAttrOut(attr_valid=Timespec(10000, 0),
attr=FuseAttr(ino=1,
size=0,
blocks=1,
atime=Timespec(0, 0),
mtime=Timespec(0, 0),
ctime=Timespec(0, 0),
mode=TypeMode(S_IF.DIR, Mode(0o777)),
nlink=1,
uid=self.fuse.uid,
gid=self.fuse.gid,
rdev=0,
blksize=4096))))
await self.fuse.write((await self.assertRead(FuseLookupOp)).respond(
FuseEntryOut(
nodeid=2,
generation=1,
entry_valid=Timespec(10000, 0),
attr_valid=Timespec(10000, 0),
# the size needs to be consistent with the data we'll actually send back on read
# the kernel, I guess, handles delivering an eof
attr=FuseAttr(ino=999,
size=len(data_read_from_fuse),
blocks=1,
atime=Timespec(0, 0),
mtime=Timespec(0, 0),
ctime=Timespec(0, 0),
mode=TypeMode(S_IF.REG, Mode(0o777)),
nlink=1,
uid=self.fuse.uid,
gid=self.fuse.gid,
rdev=0,
blksize=4096))))
fh = 42
await self.fuse.write((await self.assertRead(FuseOpenOp)).respond(
FuseOpenOut(fh=fh, open_flags=FOPEN.NONE)))
await self.fuse.write(
(await self.assertRead(FuseReadOp)).respond(data_read_from_fuse))
# close file
await self.fuse.write((await self.assertRead(FuseFlushOp)).respond())
await self.fuse.write((await self.assertRead(FuseReleaseOp)).respond())
# open root and getdents
root_fh = 137
await self.fuse.write((await self.assertRead(FuseOpendirOp)).respond(
FuseOpenOut(fh=root_fh, open_flags=FOPEN.NONE)))
foobar_ino = 432
await self.fuse.write((
await self.assertRead(FuseReaddirplusOp)
).respond([
FuseDirentplus(
FuseEntryOut(
nodeid=foobar_ino,
generation=1,
entry_valid=Timespec(10000, 0),
attr_valid=Timespec(10000, 0),
# the size needs to be consistent with the data we'll actually send back on read
# the kernel, I guess, handles delivering an eof
attr=FuseAttr(ino=foobar_ino,
size=len(data_read_from_fuse),
blocks=1,
atime=Timespec(0, 0),
mtime=Timespec(0, 0),
ctime=Timespec(0, 0),
mode=TypeMode(S_IF.REG, Mode(0o777)),
nlink=1,
uid=self.fuse.uid,
gid=self.fuse.gid,
rdev=0,
blksize=4096)),
FuseDirent(
ino=foobar_ino,
off=1,
type=DT.REG,
name="foobar",
),
),
]))
# close file
await self.fuse.write((await
self.assertRead(FuseReleasedirOp)).respond())
async def open() -> None:
"Every filename in this filesystem is a symlink to stub_path"
while True:
try:
[op] = await fuse.read()
except OSError as e:
# sure wish Python had a builtin ENODEV exception, that would come in handy
if e.errno == errno.ENODEV:
# the filesystem has been unmounted, just return cleanly
return
else:
raise
sym_ino = 2
fh = 42
if isinstance(op, FuseGetattrOp):
await fuse.write(
op.respond(
FuseAttrOut(attr_valid=Timespec(10000, 0),
attr=FuseAttr(
ino=1,
size=0,
blocks=1,
atime=Timespec(0, 0),
mtime=Timespec(0, 0),
ctime=Timespec(0, 0),
mode=TypeMode(
S_IF.DIR, Mode(0o777)),
nlink=1,
uid=fuse.uid,
gid=fuse.gid,
rdev=0,
blksize=4096))))
elif isinstance(op, FuseLookupOp):
await fuse.write(
op.respond(
FuseEntryOut(
nodeid=sym_ino,
generation=1,
entry_valid=Timespec(10000, 0),
attr_valid=Timespec(10000, 0),
# the size needs to be consistent with the data we'll actually send back on read
# the kernel, I guess, handles delivering an eof
attr=FuseAttr(ino=999,
size=16,
blocks=1,
atime=Timespec(0, 0),
mtime=Timespec(0, 0),
ctime=Timespec(0, 0),
mode=TypeMode(
S_IF.LNK,
Mode(0o777)),
nlink=1,
uid=fuse.uid,
gid=fuse.gid,
rdev=0,
blksize=4096))))
elif isinstance(op, FuseOpenOp):
await fuse.write(
op.respond(
FuseOpenOut(fh=fh, open_flags=FOPEN.NONE)))
elif isinstance(op, FuseGetxattrOp):
await fuse.write(op.error(-errno.ENODATA))
elif isinstance(op, FuseReadOp):
await fuse.write(op.respond(bytes(16)))
elif isinstance(op, FuseReleaseOp):
await fuse.write(op.respond())
elif isinstance(op, FuseReadlinkOp):
await fuse.write(op.respond(stub_path))
else:
print("unhandled op", op)
raise Exception("unhandled op", op)
def from_header(cls: t.Type[T], data: bytes) -> T:
struct = ffi.cast('struct fuse_attr_out*', ffi.from_buffer(data))
return cls(
attr_valid=Timespec(struct.attr_valid, struct.attr_valid_nsec),
attr=FuseAttr.from_cffi(struct.attr),
)