There seems to be a bug in the Workspace.list_projects() method when the workspace is configured with an S3 URI. The method returns an empty list, even when the workspace contains multiple projects.

ws = Workspace(path="s3://bucket/evidently")
print(ws.list_projects())
# Output: []
# Expected a list of projects

The root cause seems to lie in the code fragment below, where a dot . is passed to list the directory contents. While this works for POSIX file systems, it does not behave the same in S3. In S3, . is treated as part of the object key, meaning /foo and /foo/. are seen as distinct prefixes.

To confirm this behavior, I modified fslocation.py to log the path. The example below shows that, indeed, a . is being appended to the S3 path..

def listdir(self, path: str):
    try:
        fullpath = posixpath.join(self.path, path)
        print(fullpath)

# Outputs: bucket/artifacts/evidently/.
# Expected bucket/artifacts/evidently/

In another part of the codebase, directory listing is handled correct by passing an empty string instead of a ..