services/web: nginx-configuration: Add support for global directives.

* gnu/services/web.scm (<nginx-configuration>)[global-directives]: Add field.
(emit-global-directive): New procedure.
(default-nginx-config): Use it.
* doc/guix.texi (Web Services): Document it.

1 files changed, 11 insertions, 0 deletions

diff --git a/doc/guix.texi b/doc/guix.texi
index 4658c6f5eb..28808b0cd5 100644
--- a/doc/guix.texi
+++ b/doc/guix.texi
@@ -20272,6 +20272,17 @@ names of loadable modules, as in this example:
 /etc/nginx/modules/ngx_http_accept_language_module.so")))
 @end lisp
 
+@item @code{global-directives} (default: @code{'()})
+Association list of global directives for the top level of the nginx
+configuration.  Values may themselves be association lists.
+
+@lisp
+(global-directives
+ `((worker_processes . 16)
+   (pcre_jit . on)
+   (events . ((worker_connections . 1024)))))
+@end lisp
+
 @item @code{extra-content} (default: @code{""})
 Extra content for the @code{http} block.  Should be string or a string
 valued G-expression.