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Set home- and tmp-dir on default DuckDB connection #30

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Set home- and tmp-dir on default DuckDB connection #30

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Set home- and tmp-dir on default DuckDB connection
jonasdedden May 4, 2026
8643b03
Merge branch 'main' into fix-duckdb-home-tmp
jonasdedden May 6, 2026
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24 changes: 8 additions & 16 deletions smoosense-py/smoosense/utils/duckdb_connections.py
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Original file line number Diff line number Diff line change
Expand Up @@ -23,10 +23,18 @@ def duckdb_connection_default() -> DuckdbConnectionMaker:
def maker() -> DuckDBPyConnection:
con = duckdb.connect()

# DuckDB's default temp_directory is ".tmp" relative to CWD, which fails
# when CWD is read-only (e.g. read-only mounted datasets).
home_directory = os.getenv("HOME", "/tmp")
temp_directory = os.path.join(home_directory, ".tmp")
os.makedirs(temp_directory, exist_ok=True)
con.execute(f"SET home_directory='{home_directory}'")
con.execute(f"SET temp_directory='{temp_directory}'")
if memory_limit:
con.execute(f"SET memory_limit='{memory_limit}'")
if threads:
con.execute(f"SET threads={threads}")
con.execute("SET parquet_metadata_cache=true")
# Now install and load the extension
con.execute("INSTALL httpfs")
con.execute("LOAD httpfs")
Expand Down Expand Up @@ -60,21 +68,7 @@ def maker() -> DuckDBPyConnection:
"or do not pass s3_client if you do not need S3 access."
)
con = duckdb_connection_default()()
home_directory = os.getenv("HOME", "/tmp")
temp_directory = os.path.join(home_directory, ".tmp")

# Ensure temp directory exists
os.makedirs(temp_directory, exist_ok=True)

# Set home_directory and temp_directory before httpfs auto-installs
con.execute(f"SET home_directory='{home_directory}'")
con.execute(f"SET temp_directory='{temp_directory}'")

# Now install and load the extension
con.execute("INSTALL httpfs")
con.execute("LOAD httpfs")
con.execute("INSTALL lance")
con.execute("LOAD lance")
# Configure DuckDB S3 settings
con.execute(f"SET s3_region='{region}'")
con.execute(f"SET s3_access_key_id='{aws_key}'")
Expand All @@ -85,8 +79,6 @@ def maker() -> DuckDBPyConnection:
con.execute(f"SET s3_endpoint='{aws_endpoint}'")
logger.warning(f'Using AWS endpoint "{aws_endpoint}"')

con.execute("SET parquet_metadata_cache=true")

if aws_token:
con.execute(f"SET s3_session_token='{aws_token}'")
return con
Expand Down
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