# Buggy code
def fill_from_lock(stage, lock_data=None):
    """Fill values for params, checksums for outs and deps from lock."""
    if not lock_data:
        return

    assert isinstance(lock_data, dict)
    items = chain(
        ((StageParams.PARAM_DEPS, dep) for dep in stage.deps),
        ((StageParams.PARAM_OUTS, out) for out in stage.outs),
    )

    checksums = {
        key: {item["path"]: item for item in lock_data.get(key, {})}
        for key in [StageParams.PARAM_DEPS, StageParams.PARAM_OUTS]
    }
    for key, item in items:
        path = item.def_path
        if isinstance(item, dependency.ParamsDependency):
            item.fill_values(get_in(lock_data, [stage.PARAM_PARAMS, path]))
            continue
        item.checksum = get_in(checksums, [key, path, item.checksum_type])


# Traceback (dvc.exceptions.RemoteCacheRequiredError)
2020-07-01 17:14:02,947 DEBUG: fetched: [(3,)]
2020-07-01 17:14:03,123 DEBUG: Removing output 'some_target' of stage: 'some_target.dvc'.
Importing 's3://some_bucket/some_target' -> 'some_target'
2020-07-01 17:14:03,123 DEBUG: Computed stage: 'some_target.dvc' md5: '2f8b87d3b22efd1638f414c3b3f65614'
2020-07-01 17:14:03,123 DEBUG: 'md5' of stage: 'some_target.dvc' changed.
2020-07-01 17:14:04,088 DEBUG: fetched: [(0,)]
2020-07-01 17:14:04,146 ERROR: failed to import s3://some_bucket/some_target. You could also try downloading it manually, and adding it with `dvc add`. - Current operation was unsuccessful because 's3://some_bucket/some_target' requires existing cache on 's3' remote. See <https://man.dvc.org/config#cache> for information on how to set up remote cache.
------------------------------------------------------------
Traceback (most recent call last):
File "/usr/lib/python3.8/site-packages/dvc/command/imp_url.py", line 14, in run
self.repo.imp_url(
File "/usr/lib/python3.8/site-packages/dvc/repo/__init__.py", line 36, in wrapper
ret = f(repo, *args, **kwargs)
File "/usr/lib/python3.8/site-packages/dvc/repo/scm_context.py", line 4, in run
result = method(repo, *args, **kw)
File "/usr/lib/python3.8/site-packages/dvc/repo/imp_url.py", line 54, in imp_url
stage.run()
File "/home/anotherbugmaster/.local/lib/python3.8/site-packages/funcy/decorators.py", line 39, in wrapper
return deco(call, *dargs, **dkwargs)
File "/usr/lib/python3.8/site-packages/dvc/stage/decorators.py", line 35, in rwlocked
return call()
File "/home/anotherbugmaster/.local/lib/python3.8/site-packages/funcy/decorators.py", line 60, in __call__
return self._func(*self._args, **self._kwargs)
File "/usr/lib/python3.8/site-packages/dvc/stage/__init__.py", line 424, in run
sync_import(self, dry, force)
File "/usr/lib/python3.8/site-packages/dvc/stage/imports.py", line 29, in sync_import
stage.save_deps()
File "/usr/lib/python3.8/site-packages/dvc/stage/__init__.py", line 387, in save_deps
dep.save()
File "/usr/lib/python3.8/site-packages/dvc/output/base.py", line 268, in save
self.info = self.save_info()
File "/usr/lib/python3.8/site-packages/dvc/output/base.py", line 192, in save_info
return self.remote.save_info(self.path_info)
File "/usr/lib/python3.8/site-packages/dvc/remote/base.py", line 762, in save_info
return self.tree.save_info(path_info, **kwargs)
File "/usr/lib/python3.8/site-packages/dvc/remote/base.py", line 329, in save_info
self.PARAM_CHECKSUM: self.get_hash(path_info, tree=tree, **kwargs)
File "/usr/lib/python3.8/site-packages/dvc/remote/base.py", line 297, in get_hash
hash_ = self.get_dir_hash(path_info, tree, **kwargs)
File "/usr/lib/python3.8/site-packages/dvc/remote/base.py", line 311, in get_dir_hash
raise RemoteCacheRequiredError(path_info)
dvc.exceptions.RemoteCacheRequiredError: Current operation was unsuccessful because 's3://some_bucket/some_target' requires existing cache on 's3' remote. See <https://man.dvc.org/config#cache> for information on how to set up remote cache.
------------------------------------------------------------

Having any troubles? Hit us up at https://dvc.org/support, we are always happy to help!

# Fixed code
def fill_from_lock(stage, lock_data=None):
    """Fill values for params, checksums for outs and deps from lock."""
    if not lock_data:
        return

    assert isinstance(lock_data, dict)
    items = chain(
        ((StageParams.PARAM_DEPS, dep) for dep in stage.deps),
        ((StageParams.PARAM_OUTS, out) for out in stage.outs),
    )

    checksums = {
        key: {item["path"]: item for item in lock_data.get(key, {})}
        for key in [StageParams.PARAM_DEPS, StageParams.PARAM_OUTS]
    }
    for key, item in items:
        path = item.def_path
        if isinstance(item, dependency.ParamsDependency):
            item.fill_values(get_in(lock_data, [stage.PARAM_PARAMS, path]))
            continue
        item.info = get_in(checksums, [key, path], {})
        item.info = item.info.copy()
        item.info.pop("path", None)