Fix slow downloads and read-only config exports

pyproject.toml

@@ -23,6 +23,7 @@ dependencies = [
     "cogent3==2026.1.12a1",
     "cogent3-h5seqs==0.7.3",
     "duckdb",
+    "httpx",
     "numba",
     "numpy",
     "polars",

src/ensembl_tui/_ftp_download.py

@@ -3,6 +3,8 @@
 from collections.abc import Callable
 from ftplib import FTP, error_perm
 
+import httpx
+
 from rich.progress import Progress, track
 from unsync import unsync
 
@@ -52,12 +54,12 @@ def _copy_to_local(
 ) -> eti_util.PathType:
     if dest.exists():
         return dest
-    ftp = configured_ftp(host=host)
-    # pass in checksum and keep going until it's correct?
-    with eti_util.atomic_write(dest, mode="wb") as outfile:
-        ftp.retrbinary(f"RETR {src}", outfile.write)
-
-    ftp.close()
+    url = f"https://{host}/{str(src).lstrip('/')}"
+    with httpx.stream("GET", url, follow_redirects=True, timeout=300.0) as response:
+        response.raise_for_status()
+        with eti_util.atomic_write(dest, mode="wb") as outfile:
+            for chunk in response.iter_bytes(chunk_size=1024 * 1024):
+                outfile.write(chunk)
     return dest
 
 

src/ensembl_tui/cli.py

@@ -71,7 +71,8 @@ def demo_config(outpath: pathlib.Path, domain: str, force_overwrite: bool) -> No
     if outpath.exists():
         shutil.rmtree(outpath)
     outpath.mkdir(parents=True, exist_ok=True)
-    shutil.copytree(eti_util.ENSEMBLDBRC, outpath, dirs_exist_ok=True)
+    shutil.copytree(eti_util.ENSEMBLDBRC, outpath, dirs_exist_ok=True,
+                    copy_function=shutil.copyfile) # install may be read only
     # we assume all files starting with alphabetical characters are valid
     for fn in pathlib.Path(outpath).glob("*"):
         if not fn.stem.isalpha():