Set MPLCONFIGDIR before matplotlib import (fixes #39)#57
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Matplotlib warns and uses a random temp directory when the default config path under HOME is not writable (e.g. AWS Lambda). Point MPLCONFIGDIR at a stable directory under tempfile.gettempdir() so imports and caching behave consistently unless the user already set MPLCONFIGDIR. Co-authored-by: endolith <endolith@gmail.com>
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Summary
Issue #39: Matplotlib logs a warning and uses a random temporary cache directory when the default config path (for example under
$HOME/.config/matplotlib) is not writable, which is common in serverless environments.Changes
tempfileand, ifMPLCONFIGDIRis not already set by the environment, set it to a stable writable directory undertempfile.gettempdir()(e.g..../usgs-lidar-tile-server-matplotlib) and ensure it exists.Users who need a specific location can still set
MPLCONFIGDIRin the environment; the code does not override an existing value.