def clone(
self, checkout_config: CheckoutConfig, path: str, snapshot_id: str
) -> None:
if path in self._get_directory_map():
raise Exception(
"""\
mount path %s is already configured (see `eden list`). \
Do you want to run `eden mount %s` instead?"""
% (path, path)
)
# Create the mount point directory
self._create_mount_point_dir(path)
# Create client directory
clients_dir = self._get_clients_dir()
clients_dir.mkdir(parents=True, exist_ok=True)
client_dir = self._create_client_dir_for_path(clients_dir, path)
# Store snapshot ID
checkout = EdenCheckout(self, Path(path), Path(client_dir))
if snapshot_id:
checkout.save_snapshot(snapshot_id)
else:
raise Exception("snapshot id not provided")
checkout.save_config(checkout_config)
# Prepare to mount
mount_info = eden_ttypes.MountArgument(
mountPoint=os.fsencode(path),
edenClientPath=os.fsencode(client_dir),
readOnly=False,
)
with self.get_thrift_client_legacy() as client:
client.mount(mount_info)
self._post_clone_checkout_setup(checkout, snapshot_id)
# Add mapping of mount path to client directory in config.json
self._add_path_to_directory_map(Path(path), os.path.basename(client_dir))
def mount(self, path: Union[Path, str], read_only: bool) -> int:
# Load the config info for this client, to make sure we
# know about the client.
path = Path(path).resolve(strict=False)
client_dir = self._get_client_dir_for_mount_point(path)
checkout = EdenCheckout(self, path, client_dir)
# Call checkout.get_config() for the side-effect of it raising an
# Exception if the config is in an invalid state.
checkout.get_config()
# Make sure the mount path exists
path.mkdir(parents=True, exist_ok=True)
# Check if it is already mounted.
try:
root = path / ".eden" / "root"
target = readlink_retry_estale(root)
if Path(target) == path:
print_stderr(
f"ERROR: Mount point in use! {path} is already mounted by Eden."
)
return 1
else:
# If we are here, MOUNT/.eden/root is a symlink, but it does not
# point to MOUNT. This suggests `path` is a subdirectory of an
# existing mount, though we should never reach this point
# because _get_client_dir_for_mount_point() above should have
# already thrown an exception. We return non-zero here just in
# case.
print_stderr(
f"ERROR: Mount point in use! "
f"{path} is already mounted by Eden as part of {root}.")
return 1
except OSError as ex:
# - ENOENT is expected if the mount is not mounted.
# - We'll get ENOTCONN if the directory was not properly unmounted from a
# previous EdenFS instance. Remounting over this directory is okay (even
# though ideally we would unmount the old stale mount point to clean it
# up).
# - EINVAL can happen if .eden/root isn't a symlink. This isn't expected
# in most circumstances, but it does mean that the directory isn't
# currently an EdenFS checkout.
err = ex.errno
if err not in (errno.ENOENT, errno.ENOTCONN, errno.EINVAL):
raise
# Ask eden to mount the path
mount_info = eden_ttypes.MountArgument(
mountPoint=bytes(path),
edenClientPath=bytes(client_dir),
readOnly=read_only)
try:
with self.get_thrift_client_legacy() as client:
client.mount(mount_info)
except eden_ttypes.EdenError as ex:
if "already mounted" in str(ex):
print_stderr(
f"ERROR: Mount point in use! {path} is already mounted by Eden."
)
return 1
return 0