Currently, the systemd-hwdb --root flag only has an effect for the 'update' verb. It would be useful to be able to use the --root option for the 'query' verb too (e.g. for testing a hwdb.bin created with systemd-hwdb update --root <path>). Use sd_hwdb_new_from_path to initialize the hwdb if --root is passed to systemd-hwdb query. Note that this functionality was not added to 'udevadm hwdb' since that command is deprecated.
System and Service Manager
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