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61 lines
3.0 KiB
Groff
61 lines
3.0 KiB
Groff
'\" t
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.TH "HWDB" "7" "" "systemd 219" "hwdb"
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.\" -----------------------------------------------------------------
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.\" * Define some portability stuff
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.\" -----------------------------------------------------------------
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.\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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.\" http://bugs.debian.org/507673
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.\" http://lists.gnu.org/archive/html/groff/2009-02/msg00013.html
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.\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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.ie \n(.g .ds Aq \(aq
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.el .ds Aq '
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.\" -----------------------------------------------------------------
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.\" * set default formatting
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.\" -----------------------------------------------------------------
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.\" disable hyphenation
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.nh
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.\" disable justification (adjust text to left margin only)
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.ad l
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.\" -----------------------------------------------------------------
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.\" * MAIN CONTENT STARTS HERE *
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.\" -----------------------------------------------------------------
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.SH "NAME"
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hwdb \- Hardware Database
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.SH "DESCRIPTION"
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.PP
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The hardware database is a key\-value store for associating modalias\-like keys to udev\-properties\-like values\&. It is used primarily by udev to add the relevant properties to matching devices, but it can also be queried directly\&.
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.SH "HARDWARE DATABASE FILES"
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.PP
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The hwdb files are read from the files located in the system hwdb directory
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/usr/lib/udev/hwdb\&.d, the volatile runtime directory
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/run/udev/hwdb\&.d
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and the local administration directory
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/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
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/etc
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have the highest priority, files in
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/run
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take precedence over files with the same name in
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/usr/lib\&. This can be used to override a system\-supplied hwdb file with a local file if needed; a symlink in
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/etc
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with the same name as a hwdb file in
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/usr/lib, pointing to
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/dev/null, disables the hwdb file entirely\&. hwdb files must have the extension
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\&.hwdb; other extensions are ignored\&.
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.PP
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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 string, 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 indivdually, they are combined by OR\&. Every match line must start at the first character of the line\&.
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.PP
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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
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"="\&. An empty line signifies the end of a record\&. Lines beginning with
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"#"
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are ignored\&.
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.PP
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The content of all hwdb files is read by
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\fBsystemd-hwdb\fR(8)
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and compiled to a binary database located at
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/etc/udev/hwdb\&.bin, or alternatively
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/usr/lib/udev/hwdb\&.bin
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if you want ship the compiled database in an immutable image\&. During runtime only the binary database is used\&.
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.SH "SEE ALSO"
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.PP
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\fBsystemd-hwdb\fR(8)
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