diff options
| -rw-r--r-- | doc/guix.texi | 24 | ||||
| -rw-r--r-- | gnu/system/nss.scm | 23 |
2 files changed, 42 insertions, 5 deletions
diff --git a/doc/guix.texi b/doc/guix.texi index 2d02a04f9c..8e36ce3a5c 100644 --- a/doc/guix.texi +++ b/doc/guix.texi @@ -5180,6 +5180,10 @@ for host names ending in @code{.local}: (name "mdns"))))) @end example +Don't worry: the @code{%mdns-host-lookup-nss} variable (see below) +contains this configuration, so you won't have to type it if all you +want is to have @code{.local} host lookup working. + Note that, in this case, in addition to setting the @code{name-service-switch} of the @code{operating-system} declaration, @code{nscd-service} must be told where to find the @code{nss-mdns} @@ -5207,6 +5211,21 @@ configuration file: @noindent @dots{} and then refer to @var{%my-base-services} instead of @var{%base-services} in the @code{operating-system} declaration. +Lastly, this relies on the availability of the Avahi service +(@pxref{Desktop Services, @code{avahi-service}}). + +For convenience, the following variables provide typical NSS +configurations. + +@defvr {Scheme Variable} %default-nss +This is the default name service switch configuration, a +@code{name-service-switch} object. +@end defvr + +@defvr {Scheme Variable} %mdns-host-lookup-nss +This is the name service switch configuration with support for host name +lookup over multicast DNS (mDNS) for host names ending in @code{.local}. +@end defvr The reference for name service switch configuration is given below. It is a direct mapping of the C library's configuration file format, so @@ -5217,11 +5236,6 @@ not only of adding this warm parenthetic feel that we like, but also static checks: you'll know about syntax errors and typos as soon as you run @command{guix system}. -@defvr {Scheme Variable} %default-nss -This is the default name service switch configuration, a -@code{name-service-switch} object. -@end defvr - @deftp {Data Type} name-service-switch This is the data type representation the configuration of libc's name diff --git a/gnu/system/nss.scm b/gnu/system/nss.scm index ec2d2517e7..f4d2855289 100644 --- a/gnu/system/nss.scm +++ b/gnu/system/nss.scm @@ -29,6 +29,8 @@ lookup-specification %default-nss + %mdns-host-lookup-nss + %files %compat %dns @@ -148,6 +150,27 @@ ;; Default NSS configuration. (name-service-switch)) +(define %mdns-host-lookup-nss + (name-service-switch + (hosts (list %files ;first, check /etc/hosts + + ;; If the above did not succeed, try with 'mdns_minimal'. + (name-service + (name "mdns_minimal") + + ;; 'mdns_minimal' is authoritative for '.local'. When it + ;; returns "not found", no need to try the next methods. + (reaction (lookup-specification + (not-found => return)))) + + ;; Then fall back to DNS. + (name-service + (name "dns")) + + ;; Finally, try with the "full" 'mdns'. + (name-service + (name "mdns")))))) + ;;; ;;; Serialization. |