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authorMathieu Othacehe <othacehe@gnu.org>2021-02-23 11:00:18 +0100
committerMathieu Othacehe <othacehe@gnu.org>2021-02-23 11:00:18 +0100
commit1a8cfb6d4c767d6cb19689404d7d0bca336ed0d6 (patch)
tree9e2f32e641c81450466d73b36df14ebc3f6437d4
parentbebcf97600b2fa65482ae8ee870800dafa34d3f8 (diff)
downloadguix-1a8cfb6d4c767d6cb19689404d7d0bca336ed0d6.tar.gz
services: postgresql-roles: Fix race condition.
Make sure that the postgresql-roles script is completed before declaring the
postgresql-roles service as started.

* gnu/services/databases.scm (postgresql-create-roles): Return the command
line instead of a program-file.
(postgresql-role-shepherd-service): Use fork+exec-command to start the role
creation script and wait for its completion before returning.
-rw-r--r--gnu/services/databases.scm21
1 files changed, 10 insertions, 11 deletions
diff --git a/gnu/services/databases.scm b/gnu/services/databases.scm
index 91ce503e82..979f3dd6c8 100644
--- a/gnu/services/databases.scm
+++ b/gnu/services/databases.scm
@@ -410,13 +410,8 @@ rolname = '" ,name "')) as not_exists;\n"
 
   (let ((host (postgresql-role-configuration-host config))
         (roles (postgresql-role-configuration-roles config)))
-    (program-file
-     "postgresql-create-roles"
-     #~(begin
-         (let ((psql #$(file-append postgresql "/bin/psql")))
-           (execl psql psql "-a"
-                  "-h" #$host
-                  "-f" #$(roles->queries roles)))))))
+    #~(let ((psql #$(file-append postgresql "/bin/psql")))
+        (list psql "-a" "-h" #$host "-f" #$(roles->queries roles)))))
 
 (define (postgresql-role-shepherd-service config)
   (match-record config <postgresql-role-configuration>
@@ -425,10 +420,14 @@ rolname = '" ,name "')) as not_exists;\n"
            (requirement '(postgres))
            (provision '(postgres-roles))
            (one-shot? #t)
-           (start #~(make-forkexec-constructor
-                     (list #$(postgresql-create-roles config))
-                     #:user "postgres" #:group "postgres"
-                     #:log-file #$log))
+           (start
+            #~(lambda args
+                (let ((pid (fork+exec-command
+                            #$(postgresql-create-roles config)
+                            #:user "postgres"
+                            #:group "postgres"
+                            #:log-file #$log)))
+                  (zero? (cdr (waitpid pid))))))
            (documentation "Create PostgreSQL roles.")))))
 
 (define postgresql-role-service-type