diff options
Diffstat (limited to 'gnu/services/base.scm')
| -rw-r--r-- | gnu/services/base.scm | 54 |
1 files changed, 49 insertions, 5 deletions
diff --git a/gnu/services/base.scm b/gnu/services/base.scm index 3409bd352c..228d3c5926 100644 --- a/gnu/services/base.scm +++ b/gnu/services/base.scm @@ -1252,18 +1252,57 @@ the tty to run, among other things." (string-concatenate (map cache->config caches))))))) +(define (nscd-action-procedure nscd config option) + ;; XXX: This is duplicated from mcron; factorize. + #~(lambda (_ . args) + ;; Run 'nscd' in a pipe so we can explicitly redirect its output to + ;; 'current-output-port', which at this stage is bound to the client + ;; connection. + (let ((pipe (apply open-pipe* OPEN_READ #$nscd + "-f" #$config #$option args))) + (let loop () + (match (read-line pipe 'concat) + ((? eof-object?) + (catch 'system-error + (lambda () + (zero? (close-pipe pipe))) + (lambda args + ;; There's a race with the SIGCHLD handler, which could + ;; call 'waitpid' before 'close-pipe' above does. If we + ;; get ECHILD, that means we lost the race, but that's + ;; fine. + (or (= ECHILD (system-error-errno args)) + (apply throw args))))) + (line + (display line) + (loop))))))) + +(define (nscd-actions nscd config) + "Return Shepherd actions for NSCD." + ;; Make this functionality available as actions because that's a simple way + ;; to run the right 'nscd' binary with the right config file. + (list (shepherd-action + (name 'statistics) + (documentation "Display statistics about nscd usage.") + (procedure (nscd-action-procedure nscd config "--statistics"))) + (shepherd-action + (name 'invalidate) + (documentation + "Invalidate the given cache--e.g., 'hosts' for host name lookups.") + (procedure (nscd-action-procedure nscd config "--invalidate"))))) + (define (nscd-shepherd-service config) "Return a shepherd service for CONFIG, an <nscd-configuration> object." - (let ((nscd.conf (nscd.conf-file config)) + (let ((nscd (file-append (nscd-configuration-glibc config) + "/sbin/nscd")) + (nscd.conf (nscd.conf-file config)) (name-services (nscd-configuration-name-services config))) (list (shepherd-service (documentation "Run libc's name service cache daemon (nscd).") (provision '(nscd)) (requirement '(user-processes)) (start #~(make-forkexec-constructor - (list #$(file-append (nscd-configuration-glibc config) - "/sbin/nscd") - "-f" #$nscd.conf "--foreground") + (list #$nscd "-f" #$nscd.conf "--foreground") ;; Wait for the PID file. However, the PID file is ;; written before nscd is actually listening on its @@ -1277,7 +1316,12 @@ the tty to run, among other things." (string-append dir "/lib")) (list #$@name-services)) ":"))))) - (stop #~(make-kill-destructor)))))) + (stop #~(make-kill-destructor)) + (modules `((ice-9 popen) ;for the actions + (ice-9 rdelim) + (ice-9 match) + ,@%default-modules)) + (actions (nscd-actions nscd nscd.conf)))))) (define nscd-activation ;; Actions to take before starting nscd. |