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hwdb(7)

NAME

   hwdb - Hardware Database

DESCRIPTION

   The hardware database is a key-value store for associating
   modalias-like keys to udev-property-like values. It is used primarily
   by udev to add the relevant properties to matching devices, but it can
   also be queried directly.

HARDWARE DATABASE FILES

   The hwdb files are read from the files located in the system hwdb
   directory /lib/udev/hwdb.d and the local administration directory
   /etc/udev/hwdb.d. All hwdb files are collectively sorted and processed
   in lexical order, regardless of the directories in which they live.
   However, files with identical filenames replace each other. Files in
   /etc have the highest priority and take precedence over files with the
   same name in /lib. This can be used to override a system-supplied hwdb
   file with a local file if needed; a symlink in /etc with the same name
   as a hwdb file in /lib, pointing to /dev/null, disables the hwdb file
   entirely. hwdb files must have the extension .hwdb; other extensions
   are ignored.

   The hwdb file contains data records consisting of matches and
   associated key-value pairs. Every record in the hwdb starts with one or
   more match strings, specifying a shell glob to compare the database
   lookup string against. Multiple match lines are specified in additional
   consecutive lines. Every match line is compared individually, and they
   are combined by OR. Every match line must start at the first character
   of the line.

   The match lines are followed by one or more key-value pair lines, which
   are recognized by a leading space character. The key name and value are
   separated by "=". An empty line signifies the end of a record. Lines
   beginning with "#" are ignored.

   The content of all hwdb files is read by systemd-hwdb(8) and compiled
   to a binary database located at /etc/udev/hwdb.bin, or alternatively
   /lib/udev/hwdb.bin if you want ship the compiled database in an
   immutable image. During runtime, only the binary database is used.

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