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services: base: Add file->udev-rule function.
This function allows passing a file-like object to the udev service. * gnu/services/base.scm (file->udev-rule): New function. * doc/guix.texi (Base Services): Document it. Signed-off-by: Ludovic Courtès <ludo@gnu.org>
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Maxim Cournoyer
Ludovic Courtès
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2 changed files with 115 additions and 21 deletions
119
doc/guix.texi
119
doc/guix.texi
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@ -9790,35 +9790,112 @@ Return a service that runs the Guix build daemon according to
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@var{config}.
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@end deffn
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@cindex udev-service
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@cindex udev-rule
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@deffn {Scheme Procedure} udev-service [#:udev @var{udev}] [#:rules @var{'()}]
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@deffn {Scheme Procedure} udev-service [#:udev @var{eudev} #:rules @code{'()}]
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Run @var{udev}, which populates the @file{/dev} directory dynamically.
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Additional udev rules can be provided as a list of files through the
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@var{rules} variable. The procedure @var{udev-rule} simplifies the
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creation of these rule files.
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udev rules can be provided as a list of files through the @var{rules}
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variable. The procedures @var{udev-rule} and @var{file->udev-rule} from
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@code{(gnu services base)} simplify the creation of such rule files.
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@deffn {Scheme Procedure} udev-rule [@var{file-name} @var{contents}]
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Return a udev-rule file named @var{file-name} containing the rules
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defined by the @var{contents} literal.
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In the following example, a rule for a USB device is defined to be
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stored in the file @file{90-usb-thing.rules}, and the default
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@var{udev-service} is extended with it. The rule runs a script upon
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detecting a USB device with a given product identifier.
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stored in the file @file{90-usb-thing.rules}. The rule runs a script
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upon detecting a USB device with a given product identifier.
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@example
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(define %example-udev-rule
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(udev-rule "90-usb-thing.rules"
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"ACTION==\"add\", SUBSYSTEM==\"usb\", ATTR@{product@}==\"Example\", RUN+=\"/path/to/script\""))
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(operating-system
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;; @dots{}
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(services (modify-services %desktop-services
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(udev-service-type config =>
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(udev-configuration (inherit config)
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(rules (append (udev-configuration-rules config)
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(list %example-udev-rule))))))))
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(udev-rule
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"90-usb-thing.rules"
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(string-append "ACTION==\"add\", SUBSYSTEM==\"usb\", "
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"ATTR@{product@}==\"Example\", "
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"RUN+=\"/path/to/script\"")))
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@end example
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@end deffn
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@deffn {Scheme Procedure} urandom-seed-service @var{#f}
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Here we show how the default @var{udev-service} can be extended with it.
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@example
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(operating-system
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;; @dots{}
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(services
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(modify-services %desktop-services
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(udev-service-type config =>
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(udev-configuration (inherit config)
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(rules (append (udev-configuration-rules config)
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(list %example-udev-rule))))))))
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@end example
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@deffn {Scheme Procedure} file->udev-rule [@var{file-name} @var{file}]
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Return a udev file named @var{file-name} containing the rules defined
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within @var{file}, a file-like object.
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The following example showcases how we can use an existing rule file.
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@example
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(use-modules (guix download) ;for url-fetch
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(guix packages) ;for origin
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;; @dots{})
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(define %android-udev-rules
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(file->udev-rule
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"51-android-udev.rules"
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(let ((version "20170910"))
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(origin
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(method url-fetch)
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(uri (string-append "https://raw.githubusercontent.com/M0Rf30/"
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"android-udev-rules/" version "/51-android.rules"))
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(sha256
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(base32 "0lmmagpyb6xsq6zcr2w1cyx9qmjqmajkvrdbhjx32gqf1d9is003"))))))
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@end example
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@end deffn
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Additionally, Guix package definitions can be included in @var{rules} in
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order to extend the udev rules with the definitions found under their
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@file{lib/udev/rules.d} sub-directory. In lieu of the previous
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@var{file->udev-rule} example, we could have used the
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@var{android-udev-rules} package which exists in Guix in the @code{(gnu
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packages android)} module.
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The following example shows how to use the @var{android-udev-rules}
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package so that the Android tool @command{adb} can detect devices
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without root privileges. It also details how to create the
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@code{adbusers} group, which is required for the proper functioning of
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the rules defined within the @var{android-udev-rules} package. To
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create such a group, we must define it both as part of the
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@var{supplementary-groups} of our @var{user-account} declaration, as
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well as in the @var{groups} field of the @var{operating-system} record.
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@example
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(use-modules (gnu packages android) ;for android-udev-rules
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(gnu system shadow) ;for user-group
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;; @dots{})
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(operating-system
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;; @dots{}
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(users (cons (user-acount
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;; @dots{}
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(supplementary-groups
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'("adbusers" ;for adb
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"wheel" "netdev" "audio" "video"))
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;; @dots{})))
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(groups (cons (user-group (system? #t) (name "adbusers"))
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%base-groups))
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;; @dots{}
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(services
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(modify-services %desktop-services
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(udev-service-type config =>
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(udev-configuration (inherit config)
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(rules (cons* android-udev-rules
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(udev-configuration-rules config))))))))
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@end example
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@end deffn
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@deffn {Scheme Procedure} urandom-seed-service
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Save some entropy in @var{%random-seed-file} to seed @file{/dev/urandom}
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when rebooting.
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@end deffn
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@ -9930,7 +10007,7 @@ to add @var{device} to the kernel's entropy pool. The service will fail if
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@cindex session limits
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@cindex ulimit
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@cindex priority
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@deffn {Scheme Procedure} pam-limits-service [#:limits @var{limits}]
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@deffn {Scheme Procedure} pam-limits-service [#:limits @code{'()}]
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Return a service that installs a configuration file for the
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@uref{http://linux-pam.org/Linux-PAM-html/sag-pam_limits.html,
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@ -71,6 +71,7 @@ (define-module (gnu services base)
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udev-service-type
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udev-service
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udev-rule
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file->udev-rule
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login-configuration
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login-configuration?
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@ -1630,6 +1631,22 @@ (define rules.d
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(lambda (port)
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(display #$contents port)))))))
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(define (file->udev-rule file-name file)
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"Return a directory with a udev rule file FILE-NAME which is a copy of FILE."
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(computed-file file-name
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(with-imported-modules '((guix build utils))
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#~(begin
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(use-modules (guix build utils))
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(define rules.d
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(string-append #$output "/lib/udev/rules.d"))
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(define file-copy-dest
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(string-append rules.d "/" #$file-name))
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(mkdir-p rules.d)
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(copy-file #$file file-copy-dest)))))
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(define kvm-udev-rule
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;; Return a directory with a udev rule that changes the group of /dev/kvm to
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;; "kvm" and makes it #o660. Apparently QEMU-KVM used to ship this rule,
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