snape pushed a commit to branch master
in repository guix.

commit ef2dda8edb2b78cf6a2ffcdac138421b2553aec8
Author: Clément Lassieur <clem...@lassieur.org>
Date:   Mon Aug 13 20:37:09 2018 +0200

    services: postgresql: Get the Shepherd to respawn PostgreSQL.
    
    * gnu/services/databases.scm (postgresql-shepherd-service): Change 'start' 
to
    return the PID.
---
 gnu/services/databases.scm | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/gnu/services/databases.scm b/gnu/services/databases.scm
index 8ae248e..aff78a0 100644
--- a/gnu/services/databases.scm
+++ b/gnu/services/databases.scm
@@ -221,13 +221,20 @@ host      all     all     ::1/128         trust"))
                        (setuid (passwd:uid user))
                        (execl pg_ctl pg_ctl "-D" #$data-directory "-o" options
                               mode)))))))
+            (pid-file (in-vicinity data-directory "postmaster.pid"))
             (action (lambda args
                       #~(lambda _
-                          (invoke #$pg_ctl-wrapper #$@args)))))
+                          (invoke #$pg_ctl-wrapper #$@args)
+                          (match '#$args
+                            (("start")
+                             (call-with-input-file #$pid-file read))
+                            (_ #t))))))
        (list (shepherd-service
               (provision '(postgres))
               (documentation "Run the PostgreSQL daemon.")
               (requirement '(user-processes loopback syslogd))
+              (modules `((ice-9 match)
+                         ,@%default-modules))
               (start (action "start"))
               (stop (action "stop"))))))))
 

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