From ea5b3f5102c388e8855c7d5eac57aae8d99f9b57 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Isma=C3=ABl=20Bouya?= <ismael.bouya@normalesup.org>
Date: Sat, 1 Jun 2019 12:33:18 +0200
Subject: Add webapp dirs in websites module

---
 modules/websites/default.nix | 29 ++++++++++++++++++++++++-----
 1 file changed, 24 insertions(+), 5 deletions(-)

diff --git a/modules/websites/default.nix b/modules/websites/default.nix
index 4b21efb7..2e1d23a4 100644
--- a/modules/websites/default.nix
+++ b/modules/websites/default.nix
@@ -1,11 +1,25 @@
 { lib, config, ... }: with lib;
 let
-  cfg = config.services.websites;
+  cfg = {
+    certs = config.services.websitesCerts;
+    webappDirs = config.services.websitesWebappDirs;
+    env = config.services.websites;
+  };
 in
 {
   options.services.websitesCerts = mkOption {
     description = "Default websites configuration for certificates as accepted by acme";
   };
+  options.services.websitesWebappDirs = mkOption {
+    description = ''
+      Defines a symlink between /run/current-system/webapps and a store
+      app directory to be used in http configuration. Permits to avoid
+      restarting httpd when only the folder name changes.
+      '';
+    type = types.attrsOf types.path;
+    default = {};
+  };
+  # TODO: ajouter /run/current-system/webapps (RO) et webapps (RW)
   options.services.websites = with types; mkOption {
     default = {};
     description = "Each type of website to enable will target a distinct httpd server";
@@ -164,17 +178,17 @@ in
         ++ (attrsets.mapAttrsToList (n: v: toVhost icfg.ips v) icfg.vhostConfs)
         ++ [ (redirectVhost icfg.ips) ];
     })
-  ) cfg;
+  ) cfg.env;
 
   config.services.filesWatcher = attrsets.mapAttrs' (name: icfg: attrsets.nameValuePair
     "httpd${icfg.httpdName}" {
       paths = icfg.watchPaths;
       waitTime = 5;
     }
-  ) cfg;
+  ) cfg.env;
 
   config.security.acme.certs = let
-    typesToManage = attrsets.filterAttrs (k: v: v.enable) cfg;
+    typesToManage = attrsets.filterAttrs (k: v: v.enable) cfg.env;
     flatVhosts = lists.flatten (attrsets.mapAttrsToList (k: v:
       attrValues v.vhostConfs
     ) typesToManage);
@@ -200,7 +214,7 @@ in
         );
   in attrsets.mapAttrs (k: g:
     if (!isNull (groupToDomain g))
-    then config.services.websitesCerts // {
+    then cfg.certs // {
       domain = groupToDomain g;
       extraDomains = builtins.listToAttrs (
         map (d: attrsets.nameValuePair d null) (extraDomains g));
@@ -210,4 +224,9 @@ in
         map (d: attrsets.nameValuePair d null) (extraDomains g));
     }
   ) groupedCerts;
+
+  config.system.extraSystemBuilderCmds = lib.mkIf (builtins.length (builtins.attrValues cfg.webappDirs) > 0) ''
+    mkdir -p $out/webapps
+    ${builtins.concatStringsSep "\n" (attrsets.mapAttrsToList (name: path: "ln -s ${path} $out/webapps/${name}") cfg.webappDirs)}
+  '';
 }
-- 
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