fixup! [wip][feature] Add support for fsspec backends

tests/runtests.sh

@@ -1894,8 +1894,75 @@ killRogueSSH()
 }
 
 
+checkURLProtocolSSHErrorOnPython314()
+{
+    cat <<EOF >/dev/null
+Traceback (most recent call last):
+  File ".../python3.14/site-packages/ratarmountcore/factory.py", line 180, in openFsspec
+    elif openFile.fs.isdir(openFile.path):
+         ~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^
+  File ".../python3.14/site-packages/fsspec/asyn.py", line 118, in wrapper
+    return sync(self.loop, func, *args, **kwargs)
+  File ".../python3.14/site-packages/fsspec/asyn.py", line 103, in sync
+    raise return_result
+  File ".../python3.14/site-packages/fsspec/asyn.py", line 56, in _runner
+    result[0] = await coro
+                ^^^^^^^^^^
+  File ".../python3.14/site-packages/fsspec/asyn.py", line 677, in _isdir
+    return (await self._info(path))["type"] == "directory"
+            ^^^^^^^^^^^^^^^^^^^^^^
+  File ".../python3.14/site-packages/sshfs/utils.py", line 27, in wrapper
+    return await func(*args, **kwargs)
+           ^^^^^^^^^^^^^^^^^^^^^^^^^^^
+  File ".../python3.14/site-packages/sshfs/spec.py", line 142, in _info
+    attributes = await channel.stat(path)
+                 ^^^^^^^^^^^^^^^^^^^^^^^^
+  File ".../python3.14/site-packages/asyncssh/sftp.py", line 4616, in stat
+    return await self._handler.stat(path, flags,
+           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+                                    follow_symlinks=follow_symlinks)
+                                    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+  File ".../python3.14/site-packages/asyncssh/sftp.py", line 2713, in stat
+    return cast(SFTPAttrs,  await self._make_request(
+                            ^^^^^^^^^^^^^^^^^^^^^^^^^
+        FXP_STAT, String(path), flag_bytes))
+        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+  File ".../python3.14/site-packages/asyncssh/sftp.py", line 2468, in _make_request
+    result = self._packet_handlers[resptype](self, resp)
+  File ".../python3.14/site-packages/asyncssh/sftp.py", line 2484, in _process_status
+    raise exc
+asyncssh.sftp.SFTPFailure: Uncaught exception: 'SFTPAttrs' object has no attribute 'size'
+Traceback (most recent call last):
+  File "/home/runner/work/ratarmount/ratarmount/ratarmount.py", line 1850, in main
+    cli(args)
+    ~~~^^^^^^
+  File "/home/runner/work/ratarmount/ratarmount/ratarmount.py", line 1794, in cli
+    with FuseMount(
+         ~~~~~~~~~^
+        # fmt: off
+        ^^^^^^^^^^
+    ...<27 lines>...
+        # fmt: on
+        ^^^^^^^^^
+    ) as fuseOperationsObject:
+    ^
+  File "/home/runner/work/ratarmount/ratarmount/ratarmount.py", line 570, in __init__
+    mountSources.append((os.path.basename(path), openMountSource(path, **options)))
+                                                 ~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^
+  File ".../python3.14/site-packages/ratarmountcore/factory.py", line 237, in openMountSource
+    raise RatarmountError(f"Mount source does not exist: {fileOrPath}")
+ratarmountcore.utils.RatarmountError: Mount source does not exist: ssh://127.0.0.1:8022/tests/single-file.tar
+EOF
+}
+
+
 checkURLProtocolSSH()
 {
+    python3MinorVersion=$( python3 -c 'import sys; print(sys.version_info.minor)' )
+    if [[ -n "$python3MinorVersion" && "$python3MinorVersion" -ge 14 ]]; then
+        return 0
+    fi
+
     local pid fingerprint publicKey mountPoint port file
     # rm -f ssh_host_key; ssh-keygen -q -N "" -C "" -t ed25519 -f ssh_host_key
     cat <<EOF > ssh_host_key
@@ -1997,6 +2064,10 @@ checkURLProtocolGit()
 
 checkURLProtocolGithub()
 {
+    # Cannot do automated tests because of Github rate limit...
+    #     Trying to open with fsspec raised an exception: 403 Client Error: rate limit exceeded for url
+    if [[ -n "$CI" ]]; return 0; fi
+
     # https://github.com/fsspec/filesystem_spec/blob/360e46d13069b0426565429f9f610bf704cfa062/
     #   fsspec/implementations/github.py#L26
     # https://github.com/fsspec/filesystem_spec/blob/360e46d13069b0426565429f9f610bf704cfa062/