@@ -532,37 +532,48 @@ def _get_config_or_cache_dir(xdg_base_getter):
532532 elif sys .platform .startswith (('linux' , 'freebsd' )):
533533 # Only call _xdg_base_getter here so that MPLCONFIGDIR is tried first,
534534 # as _xdg_base_getter can throw.
535- configdir = Path (xdg_base_getter (), "matplotlib" )
535+ try :
536+ configdir = Path (xdg_base_getter (), "matplotlib" )
537+ except RuntimeError : # raised if Path.home() is not available
538+ pass
536539 else :
537- configdir = Path .home () / ".matplotlib"
538- # Resolve the path to handle potential issues with inaccessible symlinks.
539- configdir = configdir .resolve ()
540- try :
541- configdir .mkdir (parents = True , exist_ok = True )
542- except OSError as exc :
543- _log .warning ("mkdir -p failed for path %s: %s" , configdir , exc )
540+ try :
541+ configdir = Path .home () / ".matplotlib"
542+ except RuntimeError : # raised if Path.home() is not available
543+ pass
544+ 545+ if configdir :
546+ # Resolve the path to handle potential issues with inaccessible symlinks.
547+ configdir = configdir .resolve ()
548+ try :
549+ configdir .mkdir (parents = True , exist_ok = True )
550+ except OSError as exc :
551+ _log .warning ("mkdir -p failed for path %s: %s" , configdir , exc )
552+ else :
553+ if os .access (str (configdir ), os .W_OK ) and configdir .is_dir ():
554+ return str (configdir )
555+ _log .warning ("%s is not a writable directory" , configdir )
556+ issue_msg = "the default path ({configdir})"
544557 else :
545- if os .access (str (configdir ), os .W_OK ) and configdir .is_dir ():
546- return str (configdir )
547- _log .warning ("%s is not a writable directory" , configdir )
558+ issue_msg = "resolving the home directory"
548559 # If the config or cache directory cannot be created or is not a writable
549560 # directory, create a temporary one.
550561 try :
551562 tmpdir = tempfile .mkdtemp (prefix = "matplotlib-" )
552563 except OSError as exc :
553564 raise OSError (
554565 f"Matplotlib requires access to a writable cache directory, but there "
555- f"was an issue with the default path ( { configdir } ) , and a temporary "
566+ f"was an issue with { issue_msg }
556567 f"directory could not be created; set the MPLCONFIGDIR environment "
557568 f"variable to a writable directory" ) from exc
558569 os .environ ["MPLCONFIGDIR" ] = tmpdir
559570 atexit .register (shutil .rmtree , tmpdir )
560571 _log .warning (
561572 "Matplotlib created a temporary cache directory at %s because there was "
562- "an issue with the default path (%s) ; it is highly recommended to set the "
573+ "an issue with %s ; it is highly recommended to set the "
563574 "MPLCONFIGDIR environment variable to a writable directory, in particular to "
564575 "speed up the import of Matplotlib and to better support multiprocessing." ,
565- tmpdir , configdir )
576+ tmpdir , issue_msg )
566577 return tmpdir
567578
568579
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