First tries local /keybase filesystem for access. Upon failure, tests for access via the keybase filesystem web interface.
/keybase
kb_file_exists(path)
file path for existence test
NA if not found, otherwise the either the filesystem path or URL path
NA
# NOT RUN { kb_file_exists("/hrbrmstr/cran/PACKAGES") kb_file_exists("/hrbrmstr/cran/PACKAGES.gz") kb_file_exists("/hrbrmstr/cran/PACKAGES.rds") # }
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