[bug#28560] [PATCH] web: Add try-files for the nginx-service-type.

[Oleg Pykhalov <go.wigust@gmail.com>]

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Fix failed test.
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guix environment guix -- make check-system TESTS=nginx
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And system build is fine, too.
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./pre-inst-env guix system build ~/dotfiles/guix/system-magnolia.scm
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From 20e411b4d3513106de43980afd46a71fea4cf107 Mon Sep 17 00:00:00 2001
From: Oleg Pykhalov <go.wigust@gmail.com>
Date: Sat, 23 Sep 2017 03:27:49 +0300
Subject: [PATCH] web: Add try-files for the nginx-service-type.

* gnu/services/web.scm (<nginx-server-configuration>): Add
  nginx-server-configuration-try-files.
(emit-nginx-server-config): Add this.
---
 gnu/services/web.scm | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/gnu/services/web.scm b/gnu/services/web.scm
index 4aa6fd501..9d713003c 100644
--- a/gnu/services/web.scm
+++ b/gnu/services/web.scm
@@ -99,6 +99,8 @@
                        (default '()))
   (index               nginx-server-configuration-index
                        (default (list "index.html")))
+  (try-files           nginx-server-configuration-try-files
+                       (default '()))
   (ssl-certificate     nginx-server-configuration-ssl-certificate
                        (default "/etc/nginx/cert.pem"))
   (ssl-certificate-key nginx-server-configuration-ssl-certificate-key
@@ -179,6 +181,7 @@ of index files."
          (nginx-server-configuration-ssl-certificate-key server))
         (root (nginx-server-configuration-root server))
         (index (nginx-server-configuration-index server))
+        (try-files (nginx-server-configuration-try-files server))
         (server-tokens? (nginx-server-configuration-server-tokens? server))
         (locations (nginx-server-configuration-locations server)))
     (define-syntax-parameter <> (syntax-rules ()))
@@ -207,6 +210,9 @@ of index files."
      (and/l ssl-certificate-key "      ssl_certificate_key " <> ";\n")
      "      root " root ";\n"
      "      index " (config-index-strings index) ";\n"
+     (if (not (nil? try-files))
+         (and/l (config-index-strings try-files) "      try_files " <> ";\n")
+         "")
      "      server_tokens " (if server-tokens? "on" "off") ";\n"
      "\n"
      (map emit-nginx-location-config locations)
-- 
2.14.1