services: nscd: Add 'invalidate' and 'statistics' actions.
* gnu/services/base.scm (nscd-action-procedure, nscd-actions): New procedures. (nscd-shepherd-service): Add 'modules' and 'actions' fields. * gnu/tests/base.scm (run-basic-test)["nscd invalidate action"] ["nscd invalidate action, wrong table"]: New tests. * doc/guix.texi (Services): Mention 'herd doc nscd action'. (Base Services): Document the actions.
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Ludovic Courtès
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@ -10563,11 +10563,14 @@ Start,,, shepherd, The GNU Shepherd Manual}). For example:
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The above command, run as @code{root}, lists the currently defined
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services. The @command{herd doc} command shows a synopsis of the given
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service:
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service and its associated actions:
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@example
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# herd doc nscd
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Run libc's name service cache daemon (nscd).
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# herd doc nscd action invalidate
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invalidate: Invalidate the given cache--e.g., 'hosts' for host name lookups.
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@end example
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The @command{start}, @command{stop}, and @command{restart} sub-commands
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@ -10965,6 +10968,27 @@ The Kmscon package to use.
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Return a service that runs the libc name service cache daemon (nscd) with the
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given @var{config}---an @code{<nscd-configuration>} object. @xref{Name
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Service Switch}, for an example.
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For convenience, the Shepherd service for nscd provides the following actions:
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@table @code
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@item invalidate
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@cindex cache invalidation, nscd
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@cindex nscd, cache invalidation
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This invalidate the given cache. For instance, running:
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@example
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herd invalidate nscd hosts
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@end example
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@noindent
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invalidates the host name lookup cache of nscd.
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@item statistics
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Running @command{herd statistics nscd} displays information about nscd usage
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and caches.
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@end table
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@end deffn
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@defvr {Scheme Variable} %nscd-default-configuration
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@ -1252,18 +1252,57 @@ the tty to run, among other things."
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(string-concatenate
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(map cache->config caches)))))))
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(define (nscd-action-procedure nscd config option)
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;; XXX: This is duplicated from mcron; factorize.
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#~(lambda (_ . args)
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;; Run 'nscd' in a pipe so we can explicitly redirect its output to
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;; 'current-output-port', which at this stage is bound to the client
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;; connection.
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(let ((pipe (apply open-pipe* OPEN_READ #$nscd
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"-f" #$config #$option args)))
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(let loop ()
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(match (read-line pipe 'concat)
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((? eof-object?)
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(catch 'system-error
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(lambda ()
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(zero? (close-pipe pipe)))
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(lambda args
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;; There's a race with the SIGCHLD handler, which could
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;; call 'waitpid' before 'close-pipe' above does. If we
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;; get ECHILD, that means we lost the race, but that's
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;; fine.
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(or (= ECHILD (system-error-errno args))
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(apply throw args)))))
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(line
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(display line)
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(loop)))))))
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(define (nscd-actions nscd config)
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"Return Shepherd actions for NSCD."
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;; Make this functionality available as actions because that's a simple way
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;; to run the right 'nscd' binary with the right config file.
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(list (shepherd-action
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(name 'statistics)
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(documentation "Display statistics about nscd usage.")
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(procedure (nscd-action-procedure nscd config "--statistics")))
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(shepherd-action
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(name 'invalidate)
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(documentation
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"Invalidate the given cache--e.g., 'hosts' for host name lookups.")
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(procedure (nscd-action-procedure nscd config "--invalidate")))))
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(define (nscd-shepherd-service config)
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"Return a shepherd service for CONFIG, an <nscd-configuration> object."
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(let ((nscd.conf (nscd.conf-file config))
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(let ((nscd (file-append (nscd-configuration-glibc config)
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"/sbin/nscd"))
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(nscd.conf (nscd.conf-file config))
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(name-services (nscd-configuration-name-services config)))
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(list (shepherd-service
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(documentation "Run libc's name service cache daemon (nscd).")
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(provision '(nscd))
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(requirement '(user-processes))
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(start #~(make-forkexec-constructor
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(list #$(file-append (nscd-configuration-glibc config)
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"/sbin/nscd")
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"-f" #$nscd.conf "--foreground")
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(list #$nscd "-f" #$nscd.conf "--foreground")
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;; Wait for the PID file. However, the PID file is
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;; written before nscd is actually listening on its
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@ -1277,7 +1316,12 @@ the tty to run, among other things."
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(string-append dir "/lib"))
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(list #$@name-services))
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":")))))
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(stop #~(make-kill-destructor))))))
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(stop #~(make-kill-destructor))
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(modules `((ice-9 popen) ;for the actions
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(ice-9 rdelim)
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(ice-9 match)
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,@%default-modules))
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(actions (nscd-actions nscd nscd.conf))))))
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(define nscd-activation
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;; Actions to take before starting nscd.
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@ -335,6 +335,20 @@ info --version")
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(x
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(pk 'failure x #f))))
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(test-equal "nscd invalidate action"
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'(#t) ;one value, #t
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(marionette-eval '(with-shepherd-action 'nscd ('invalidate "hosts")
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result
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result)
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marionette))
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(test-equal "nscd invalidate action, wrong table"
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'(#f) ;one value, #f
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(marionette-eval '(with-shepherd-action 'nscd ('invalidate "xyz")
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result
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result)
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marionette))
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(test-equal "host not found"
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#f
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(marionette-eval
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