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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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22 changes: 8 additions & 14 deletions smoosense-py/smoosense/utils/duckdb_connections.py
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Original file line number Diff line number Diff line change
Expand Up @@ -19,6 +19,14 @@ 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}'")

# Now install and load the extension
con.execute("INSTALL httpfs")
con.execute("LOAD httpfs")
Expand Down Expand Up @@ -53,22 +61,8 @@ 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}'")
con.execute(f"SET memory_limit='{memory_limit}'")

# 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 Down