Suggested by Mathijs Kwik. ‘boot.systemd’ is a misnomer because systemd affects more than just booting. And it saves some typing.
		
			
				
	
	
		
			663 lines
		
	
	
		
			19 KiB
		
	
	
	
		
			Nix
		
	
	
	
	
	
			
		
		
	
	
			663 lines
		
	
	
		
			19 KiB
		
	
	
	
		
			Nix
		
	
	
	
	
	
{ config, pkgs, ... }:
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with pkgs.lib;
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let
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  mainCfg = config.services.httpd;
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  httpd = mainCfg.package;
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  version24 = !versionOlder httpd.version "2.4";
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  httpdConf = mainCfg.configFile;
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  php = pkgs.php.override { apacheHttpd = httpd; };
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  getPort = cfg: if cfg.port != 0 then cfg.port else if cfg.enableSSL then 443 else 80;
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  extraModules = attrByPath ["extraModules"] [] mainCfg;
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  extraForeignModules = filter builtins.isAttrs extraModules;
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  extraApacheModules = filter (x: !(builtins.isAttrs x)) extraModules; # I'd prefer using builtins.isString here, but doesn't exist yet
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  makeServerInfo = cfg: {
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    # Canonical name must not include a trailing slash.
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    canonicalName =
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      (if cfg.enableSSL then "https" else "http") + "://" +
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      cfg.hostName +
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      (if getPort cfg != (if cfg.enableSSL then 443 else 80) then ":${toString (getPort cfg)}" else "");
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    # Admin address: inherit from the main server if not specified for
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    # a virtual host.
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    adminAddr = if cfg.adminAddr != "" then cfg.adminAddr else mainCfg.adminAddr;
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    vhostConfig = cfg;
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    serverConfig = mainCfg;
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    fullConfig = config; # machine config
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  };
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  vhostOptions = import ./per-server-options.nix {
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    inherit mkOption;
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    forMainServer = false;
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  };
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  vhosts = let
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    makeVirtualHost = cfgIn:
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      let
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        # Fill in defaults for missing options.
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        cfg = addDefaultOptionValues vhostOptions cfgIn;
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      in cfg;
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    in map makeVirtualHost mainCfg.virtualHosts;
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  allHosts = [mainCfg] ++ vhosts;
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  callSubservices = serverInfo: defs:
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    let f = svc:
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      let
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        svcFunction =
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          if svc ? function then svc.function
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          else import "${./.}/${if svc ? serviceType then svc.serviceType else svc.serviceName}.nix";
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        config = addDefaultOptionValues res.options
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          (if svc ? config then svc.config else svc);
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        defaults = {
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          extraConfig = "";
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          extraModules = [];
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          extraModulesPre = [];
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          extraPath = [];
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          extraServerPath = [];
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          globalEnvVars = [];
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          robotsEntries = "";
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          startupScript = "";
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          enablePHP = false;
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          phpOptions = "";
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          options = {};
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        };
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        res = defaults // svcFunction { inherit config pkgs serverInfo php; };
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      in res;
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    in map f defs;
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  # !!! callSubservices is expensive
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  subservicesFor = cfg: callSubservices (makeServerInfo cfg) cfg.extraSubservices;
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  mainSubservices = subservicesFor mainCfg;
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  allSubservices = mainSubservices ++ concatMap subservicesFor vhosts;
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  # !!! should be in lib
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  writeTextInDir = name: text:
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    pkgs.runCommand name {inherit text;} "ensureDir $out; echo -n \"$text\" > $out/$name";
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  enableSSL = any (vhost: vhost.enableSSL) allHosts;
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  # Names of modules from ${httpd}/modules that we want to load.
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  apacheModules =
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    [ # HTTP authentication mechanisms: basic and digest.
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      "auth_basic" "auth_digest"
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      # Authentication: is the user who he claims to be?
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      "authn_file" "authn_dbm" "authn_anon"
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      (if version24 then "authn_core" else "authn_alias")
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      # Authorization: is the user allowed access?
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      "authz_user" "authz_groupfile" "authz_host"
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      # Other modules.
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      "ext_filter" "include" "log_config" "env" "mime_magic"
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      "cern_meta" "expires" "headers" "usertrack" /* "unique_id" */ "setenvif"
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      "mime" "dav" "status" "autoindex" "asis" "info" "dav_fs"
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      "vhost_alias" "negotiation" "dir" "imagemap" "actions" "speling"
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      "userdir" "alias" "rewrite" "proxy" "proxy_http"
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    ]
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    ++ optionals version24 [
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      "mpm_${mainCfg.multiProcessingModule}"
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      "authz_core"
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      "unixd"
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    ]
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    ++ (if mainCfg.multiProcessingModule == "prefork" then [ "cgi" ] else [ "cgid" ])
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    ++ optional enableSSL "ssl"
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    ++ extraApacheModules;
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  allDenied = if version24 then ''
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    Require all denied
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  '' else ''
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    Order deny,allow
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    Deny from all
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  '';
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  allGranted = if version24 then ''
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    Require all granted
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  '' else ''
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    Order allow,deny
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    Allow from all
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  '';
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  loggingConf = ''
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    ErrorLog ${mainCfg.logDir}/error_log
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    LogLevel notice
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    LogFormat "%h %l %u %t \"%r\" %>s %b \"%{Referer}i\" \"%{User-Agent}i\"" combined
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    LogFormat "%h %l %u %t \"%r\" %>s %b" common
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    LogFormat "%{Referer}i -> %U" referer
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    LogFormat "%{User-agent}i" agent
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    CustomLog ${mainCfg.logDir}/access_log ${mainCfg.logFormat}
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  '';
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  browserHacks = ''
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    BrowserMatch "Mozilla/2" nokeepalive
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    BrowserMatch "MSIE 4\.0b2;" nokeepalive downgrade-1.0 force-response-1.0
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    BrowserMatch "RealPlayer 4\.0" force-response-1.0
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    BrowserMatch "Java/1\.0" force-response-1.0
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    BrowserMatch "JDK/1\.0" force-response-1.0
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    BrowserMatch "Microsoft Data Access Internet Publishing Provider" redirect-carefully
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    BrowserMatch "^WebDrive" redirect-carefully
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    BrowserMatch "^WebDAVFS/1.[012]" redirect-carefully
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    BrowserMatch "^gnome-vfs" redirect-carefully
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  '';
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  sslConf = ''
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    SSLSessionCache shm:${mainCfg.stateDir}/ssl_scache(512000)
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    SSLMutex posixsem
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    SSLRandomSeed startup builtin
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    SSLRandomSeed connect builtin
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  '';
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  mimeConf = ''
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    TypesConfig ${httpd}/conf/mime.types
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    AddType application/x-x509-ca-cert .crt
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    AddType application/x-pkcs7-crl    .crl
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    AddType application/x-httpd-php    .php .phtml
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    <IfModule mod_mime_magic.c>
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        MIMEMagicFile ${httpd}/conf/magic
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    </IfModule>
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    AddEncoding x-compress Z
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    AddEncoding x-gzip gz tgz
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  '';
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  perServerConf = isMainServer: cfg: let
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    serverInfo = makeServerInfo cfg;
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    subservices = callSubservices serverInfo cfg.extraSubservices;
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    documentRoot = if cfg.documentRoot != null then cfg.documentRoot else
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      pkgs.runCommand "empty" {} "ensureDir $out";
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    documentRootConf = ''
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      DocumentRoot "${documentRoot}"
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      <Directory "${documentRoot}">
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          Options Indexes FollowSymLinks
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          AllowOverride None
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          ${allGranted}
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      </Directory>
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    '';
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    robotsTxt = pkgs.writeText "robots.txt" ''
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      ${# If this is a vhost, the include the entries for the main server as well.
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        if isMainServer then ""
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        else concatMapStrings (svc: svc.robotsEntries) mainSubservices}
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      ${concatMapStrings (svc: svc.robotsEntries) subservices}
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    '';
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    robotsConf = ''
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      Alias /robots.txt ${robotsTxt}
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    '';
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  in ''
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    ServerName ${serverInfo.canonicalName}
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    ${concatMapStrings (alias: "ServerAlias ${alias}\n") cfg.serverAliases}
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    ${if cfg.sslServerCert != "" then ''
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      SSLCertificateFile ${cfg.sslServerCert}
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      SSLCertificateKeyFile ${cfg.sslServerKey}
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    '' else ""}
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    ${if cfg.enableSSL then ''
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      SSLEngine on
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    '' else if enableSSL then /* i.e., SSL is enabled for some host, but not this one */
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    ''
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      SSLEngine off
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    '' else ""}
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    ${if isMainServer || cfg.adminAddr != "" then ''
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      ServerAdmin ${cfg.adminAddr}
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    '' else ""}
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    ${if !isMainServer && mainCfg.logPerVirtualHost then ''
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      ErrorLog ${mainCfg.logDir}/error_log-${cfg.hostName}
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      CustomLog ${mainCfg.logDir}/access_log-${cfg.hostName} ${cfg.logFormat}
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    '' else ""}
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    ${robotsConf}
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    ${if isMainServer || cfg.documentRoot != null then documentRootConf else ""}
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    ${if cfg.enableUserDir then ''
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      UserDir public_html
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      UserDir disabled root
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      <Directory "/home/*/public_html">
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          AllowOverride FileInfo AuthConfig Limit Indexes
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          Options MultiViews Indexes SymLinksIfOwnerMatch IncludesNoExec
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          <Limit GET POST OPTIONS>
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              ${allGranted}
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          </Limit>
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          <LimitExcept GET POST OPTIONS>
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              ${allDenied}
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          </LimitExcept>
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      </Directory>
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    '' else ""}
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    ${if cfg.globalRedirect != "" then ''
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      RedirectPermanent / ${cfg.globalRedirect}
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    '' else ""}
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    ${
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      let makeFileConf = elem: ''
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            Alias ${elem.urlPath} ${elem.file}
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          '';
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      in concatMapStrings makeFileConf cfg.servedFiles
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    }
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    ${
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      let makeDirConf = elem: ''
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            Alias ${elem.urlPath} ${elem.dir}/
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            <Directory ${elem.dir}>
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                Options +Indexes
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                ${allGranted}
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                AllowOverride All
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            </Directory>
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          '';
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      in concatMapStrings makeDirConf cfg.servedDirs
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    }
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    ${concatMapStrings (svc: svc.extraConfig) subservices}
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    ${cfg.extraConfig}
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  '';
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  confFile = pkgs.writeText "httpd.conf" ''
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    ServerRoot ${httpd}
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    ${optionalString version24 ''
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      DefaultRuntimeDir ${mainCfg.stateDir}/runtime
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    ''}
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    PidFile ${mainCfg.stateDir}/httpd.pid
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    ${optionalString (mainCfg.multiProcessingModule != "prefork") ''
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      # mod_cgid requires this.
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      ScriptSock ${mainCfg.stateDir}/cgisock
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    ''}
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    <IfModule prefork.c>
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        MaxClients           ${toString mainCfg.maxClients}
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        MaxRequestsPerChild  ${toString mainCfg.maxRequestsPerChild}
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    </IfModule>
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    ${let
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        ports = map getPort allHosts;
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        uniquePorts = uniqList {inputList = ports;};
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      in concatMapStrings (port: "Listen ${toString port}\n") uniquePorts
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    }
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    User ${mainCfg.user}
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    Group ${mainCfg.group}
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    ${let
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        load = {name, path}: "LoadModule ${name}_module ${path}\n";
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        allModules =
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          concatMap (svc: svc.extraModulesPre) allSubservices
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          ++ map (name: {inherit name; path = "${httpd}/modules/mod_${name}.so";}) apacheModules
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          ++ optional enablePHP { name = "php5"; path = "${php}/modules/libphp5.so"; }
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          ++ concatMap (svc: svc.extraModules) allSubservices
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          ++ extraForeignModules;
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      in concatMapStrings load allModules
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    }
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    AddHandler type-map var
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    <Files ~ "^\.ht">
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        ${allDenied}
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    </Files>
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    ${mimeConf}
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    ${loggingConf}
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    ${browserHacks}
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    Include ${httpd}/conf/extra/httpd-default.conf
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    Include ${httpd}/conf/extra/httpd-autoindex.conf
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    Include ${httpd}/conf/extra/httpd-multilang-errordoc.conf
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    Include ${httpd}/conf/extra/httpd-languages.conf
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    ${if enableSSL then sslConf else ""}
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    # Fascist default - deny access to everything.
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    <Directory />
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        Options FollowSymLinks
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        AllowOverride None
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        ${allDenied}
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    </Directory>
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    # But do allow access to files in the store so that we don't have
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    # to generate <Directory> clauses for every generated file that we
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    # want to serve.
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    <Directory /nix/store>
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        ${allGranted}
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    </Directory>
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    # Generate directives for the main server.
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    ${perServerConf true mainCfg}
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    # Always enable virtual hosts; it doesn't seem to hurt.
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    ${let
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        ports = map getPort allHosts;
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        uniquePorts = uniqList {inputList = ports;};
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        directives = concatMapStrings (port: "NameVirtualHost *:${toString port}\n") uniquePorts;
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      in optionalString (!version24) directives
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    }
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    ${let
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        makeVirtualHost = vhost: ''
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          <VirtualHost *:${toString (getPort vhost)}>
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              ${perServerConf false vhost}
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          </VirtualHost>
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        '';
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      in concatMapStrings makeVirtualHost vhosts
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    }
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  '';
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  enablePHP = any (svc: svc.enablePHP) allSubservices;
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  # Generate the PHP configuration file.  Should probably be factored
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  # out into a separate module.
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  phpIni = pkgs.runCommand "php.ini"
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    { options = concatStringsSep "\n"
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        ([ mainCfg.phpOptions ] ++ (map (svc: svc.phpOptions) allSubservices));
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    }
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    ''
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      cat ${php}/etc/php-recommended.ini > $out
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      echo "$options" >> $out
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    '';
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in
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{
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  ###### interface
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  options = {
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    services.httpd = {
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      enable = mkOption {
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        default = false;
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        description = "
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          Whether to enable the Apache httpd server.
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        ";
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      };
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      package = mkOption {
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        default = pkgs.apacheHttpd.override { mpm = mainCfg.multiProcessingModule; };
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	example = "pkgs.apacheHttpd_2_4";
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        description = "
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          Overridable attribute of the Apache HTTP Server package to use.
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        ";
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      };
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      configFile = mkOption {
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        default = confFile;
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	example = ''pkgs.writeText "httpd.conf" "# my custom config file ...";'';
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        description = "
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          Overridable config file to use for Apache. By default, use the
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          file automatically generated by nixos.
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        ";
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      };
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      extraConfig = mkOption {
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        default = "";
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        description = "
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          These configuration lines will be appended to the Apache config
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          file. Note that this mechanism may not work when <option>configFile</option>
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          is overridden.
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        ";
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      };
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      extraModules = mkOption {
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        default = [];
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        example = [ "proxy_connect" { name = "php5"; path = "${php}/modules/libphp5.so"; } ];
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        description = ''
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          Specifies additional Apache modules.  These can be specified
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          as a string in the case of modules distributed with Apache,
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          or as an attribute set specifying the
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          <varname>name</varname> and <varname>path</varname> of the
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          module.
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        '';
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      };
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      logPerVirtualHost = mkOption {
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        default = false;
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        description = "
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          If enabled, each virtual host gets its own
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          <filename>access_log</filename> and
 | 
						|
          <filename>error_log</filename>, namely suffixed by the
 | 
						|
          <option>hostName</option> of the virtual host.
 | 
						|
        ";
 | 
						|
      };
 | 
						|
 | 
						|
      user = mkOption {
 | 
						|
        default = "wwwrun";
 | 
						|
        description = "
 | 
						|
          User account under which httpd runs.  The account is created
 | 
						|
          automatically if it doesn't exist.
 | 
						|
        ";
 | 
						|
      };
 | 
						|
 | 
						|
      group = mkOption {
 | 
						|
        default = "wwwrun";
 | 
						|
        description = "
 | 
						|
          Group under which httpd runs.  The account is created
 | 
						|
          automatically if it doesn't exist.
 | 
						|
        ";
 | 
						|
      };
 | 
						|
 | 
						|
      logDir = mkOption {
 | 
						|
        default = "/var/log/httpd";
 | 
						|
        description = "
 | 
						|
          Directory for Apache's log files.  It is created automatically.
 | 
						|
        ";
 | 
						|
      };
 | 
						|
 | 
						|
      stateDir = mkOption {
 | 
						|
        default = "/var/run/httpd";
 | 
						|
        description = "
 | 
						|
          Directory for Apache's transient runtime state (such as PID
 | 
						|
          files).  It is created automatically.  Note that the default,
 | 
						|
          <filename>/var/run/httpd</filename>, is deleted at boot time.
 | 
						|
        ";
 | 
						|
      };
 | 
						|
 | 
						|
      virtualHosts = mkOption {
 | 
						|
        default = [];
 | 
						|
        example = [
 | 
						|
          { hostName = "foo";
 | 
						|
            documentRoot = "/data/webroot-foo";
 | 
						|
          }
 | 
						|
          { hostName = "bar";
 | 
						|
            documentRoot = "/data/webroot-bar";
 | 
						|
          }
 | 
						|
        ];
 | 
						|
        description = ''
 | 
						|
          Specification of the virtual hosts served by Apache.  Each
 | 
						|
          element should be an attribute set specifying the
 | 
						|
          configuration of the virtual host.  The available options
 | 
						|
          are the non-global options permissible for the main host.
 | 
						|
        '';
 | 
						|
      };
 | 
						|
 | 
						|
      phpOptions = mkOption {
 | 
						|
        default = "";
 | 
						|
        example =
 | 
						|
          ''
 | 
						|
            date.timezone = "CET"
 | 
						|
          '';
 | 
						|
        description =
 | 
						|
          "Options appended to the PHP configuration file <filename>php.ini</filename>.";
 | 
						|
      };
 | 
						|
 | 
						|
      multiProcessingModule = mkOption {
 | 
						|
        default = "prefork";
 | 
						|
        example = "worker";
 | 
						|
        type = types.uniq types.string;
 | 
						|
        description =
 | 
						|
          ''
 | 
						|
            Multi-processing module to be used by Apache.  Available
 | 
						|
            modules are <literal>prefork</literal> (the default;
 | 
						|
            handles each request in a separate child process),
 | 
						|
            <literal>worker</literal> (hybrid approach that starts a
 | 
						|
            number of child processes each running a number of
 | 
						|
            threads) and <literal>event</literal> (a recent variant of
 | 
						|
            <literal>worker</literal> that handles persistent
 | 
						|
            connections more efficiently).
 | 
						|
          '';
 | 
						|
      };
 | 
						|
 | 
						|
      maxClients = mkOption {
 | 
						|
        default = 150;
 | 
						|
        example = 8;
 | 
						|
        description = "Maximum number of httpd processes (prefork)";
 | 
						|
      };
 | 
						|
 | 
						|
      maxRequestsPerChild = mkOption {
 | 
						|
        default = 0;
 | 
						|
        example = 500;
 | 
						|
        description =
 | 
						|
          "Maximum number of httpd requests answered per httpd child (prefork), 0 means unlimited";
 | 
						|
      };
 | 
						|
    }
 | 
						|
 | 
						|
    # Include the options shared between the main server and virtual hosts.
 | 
						|
    // (import ./per-server-options.nix {
 | 
						|
      inherit mkOption;
 | 
						|
      forMainServer = true;
 | 
						|
    });
 | 
						|
 | 
						|
  };
 | 
						|
 | 
						|
 | 
						|
  ###### implementation
 | 
						|
 | 
						|
  config = mkIf config.services.httpd.enable {
 | 
						|
 | 
						|
    users.extraUsers = optionalAttrs (mainCfg.user == "wwwrun") singleton
 | 
						|
      { name = "wwwrun";
 | 
						|
        group = "wwwrun";
 | 
						|
        description = "Apache httpd user";
 | 
						|
        uid = config.ids.uids.wwwrun;
 | 
						|
      };
 | 
						|
 | 
						|
    users.extraGroups = optionalAttrs (mainCfg.group == "wwwrun") singleton
 | 
						|
      { name = "wwwrun";
 | 
						|
        gid = config.ids.gids.wwwrun;
 | 
						|
      };
 | 
						|
 | 
						|
    environment.systemPackages = [httpd] ++ concatMap (svc: svc.extraPath) allSubservices;
 | 
						|
 | 
						|
    services.httpd.phpOptions =
 | 
						|
      ''
 | 
						|
        ; Needed for PHP's mail() function.
 | 
						|
        sendmail_path = sendmail -t -i
 | 
						|
 | 
						|
        ; Apparently PHP doesn't use $TZ.
 | 
						|
        date.timezone = "${config.time.timeZone}"
 | 
						|
      '';
 | 
						|
 | 
						|
    systemd.services.httpd =
 | 
						|
      { description = "Apache HTTPD";
 | 
						|
 | 
						|
        wantedBy = [ "multi-user.target" ];
 | 
						|
        requires = [ "keys.target" ];
 | 
						|
        after = [ "network.target" "fs.target" "postgresql.service" "keys.target" ];
 | 
						|
 | 
						|
        path =
 | 
						|
          [ httpd pkgs.coreutils pkgs.gnugrep ]
 | 
						|
          ++ # Needed for PHP's mail() function.  !!! Probably the
 | 
						|
             # ssmtp module should export the path to sendmail in
 | 
						|
             # some way.
 | 
						|
             optional config.networking.defaultMailServer.directDelivery pkgs.ssmtp
 | 
						|
          ++ concatMap (svc: svc.extraServerPath) allSubservices;
 | 
						|
 | 
						|
        environment =
 | 
						|
          { PHPRC = if enablePHP then phpIni else "";
 | 
						|
            TZ = config.time.timeZone;
 | 
						|
          } // (listToAttrs (concatMap (svc: svc.globalEnvVars) allSubservices));
 | 
						|
 | 
						|
        preStart =
 | 
						|
          ''
 | 
						|
            mkdir -m 0750 -p ${mainCfg.stateDir}
 | 
						|
            chown root.${mainCfg.group} ${mainCfg.stateDir}
 | 
						|
            ${optionalString version24 ''
 | 
						|
              mkdir -m 0750 -p "${mainCfg.stateDir}/runtime"
 | 
						|
              chown root.${mainCfg.group} "${mainCfg.stateDir}/runtime"
 | 
						|
            ''}
 | 
						|
            mkdir -m 0700 -p ${mainCfg.logDir}
 | 
						|
 | 
						|
            ${optionalString (mainCfg.documentRoot != null)
 | 
						|
            ''
 | 
						|
              # Create the document root directory if does not exists yet
 | 
						|
              mkdir -p ${mainCfg.documentRoot}
 | 
						|
            ''
 | 
						|
            }
 | 
						|
 | 
						|
            # Get rid of old semaphores.  These tend to accumulate across
 | 
						|
            # server restarts, eventually preventing it from restarting
 | 
						|
            # succesfully.
 | 
						|
            for i in $(${pkgs.utillinux}/bin/ipcs -s | grep ' ${mainCfg.user} ' | cut -f2 -d ' '); do
 | 
						|
                ${pkgs.utillinux}/bin/ipcrm -s $i
 | 
						|
            done
 | 
						|
 | 
						|
            # Run the startup hooks for the subservices.
 | 
						|
            for i in ${toString (map (svn: svn.startupScript) allSubservices)}; do
 | 
						|
                echo Running Apache startup hook $i...
 | 
						|
                $i
 | 
						|
            done
 | 
						|
          '';
 | 
						|
 | 
						|
        serviceConfig.ExecStart = "@${httpd}/bin/httpd httpd -f ${httpdConf} -DNO_DETACH";
 | 
						|
        serviceConfig.ExecStop = "${httpd}/bin/httpd -f ${httpdConf} -k graceful-stop";
 | 
						|
        serviceConfig.Restart = "always";
 | 
						|
      };
 | 
						|
 | 
						|
  };
 | 
						|
 | 
						|
}
 |