gnu: tests: Fix guix-data-service test.

Since revision 32, guix-data-service starts immediately but returns an HTTP
error code until initialization is complete. Adjust the test accordingly, and
remove the increased startup time limit.

* gnu/services/guix.scm (guix-data-service): Use default #:pid-file-timeout.
* gnu/tests/guix.scm (guix-data-service): Retry the http-get test several
times to give the service time to initialize.

Signed-off-by: Christopher Baines <mail@cbaines.net>

gnu/services/guix.scm

@@ -652,8 +652,6 @@ (define (guix-data-service-shepherd-services config)
                 #:user #$user
                 #:group #$group
                 #:pid-file "/var/run/guix-data-service/pid"
-                ;; Allow time for migrations to run
-                #:pid-file-timeout 120
                 #:environment-variables
                 `(,(string-append
                     "GUIX_LOCPATH=" #$glibc-utf8-locales "/lib/locale")

gnu/tests/guix.scm

@@ -222,14 +222,23 @@ (define marionette
                      ((pid) (number? pid))))))
              marionette))
 
+          ;; The service starts immediately but replies with status 500 until
+          ;; initialization is complete, so keep trying for a while.
+          (define (try-http-get attempts)
+            (let ((status
+                   (let-values (((response text)
+                                 (http-get #$(simple-format
+                                              #f "http://localhost:~A/healthcheck"
+                                              forwarded-port))))
+                     (response-code response))))
+              (if (or (= status 200) (<= attempts 1))
+                  status
+                  (begin (sleep 5)
+                         (try-http-get (- attempts 1))))))
+
           (test-equal "http-get"
             200
-            (let-values
-                (((response text)
-                  (http-get #$(simple-format
-                               #f "http://localhost:~A/healthcheck" forwarded-port)
-                            #:decode-body? #t)))
-              (response-code response)))
+            (try-http-get 12))
 
           (test-end))))