Move usage of internal mirrors into a bbclass

Use bbclass to test if the internal sstate and download mirror
server is available before enabling them.

Change-Id: Ie927bdfca486232e3d3a55009139a9c27ff98aad
Reviewed-by: Teemu Holappa <teemu.holappa@theqtcompany.com>

classes/internal-build.bbclass

+##############################################################################
+##
+## Copyright (C) 2016 The Qt Company Ltd.
+## Contact: http://www.qt.io/licensing/
+##
+## This file is part of the Boot to Qt meta layer.
+##
+## $QT_BEGIN_LICENSE:COMM$
+##
+## Commercial License Usage
+## Licensees holding valid commercial Qt licenses may use this file in
+## accordance with the commercial license agreement provided with the
+## Software or, alternatively, in accordance with the terms contained in
+## a written agreement between you and The Qt Company. For licensing terms
+## and conditions see http://www.qt.io/terms-conditions. For further
+## information use the contact form at http://www.qt.io/contact-us.
+##
+## $QT_END_LICENSE$
+##
+##############################################################################
+
+python enable_internal_build () {
+    import socket
+    try:
+        socket.gethostbyname('yocto-cache.ci.local')
+    except:
+        return
+
+    e.data.setVar('SSTATE_MIRRORS', "file://.* http://yocto-cache.ci.local/sstate-caches/${DISTRO_CODENAME}/PATH")
+    e.data.setVar('PREMIRRORS', "\
+        ftp://.*/.*   http://yocto-cache.ci.local/sources/ \n \
+        http://.*/.*  http://yocto-cache.ci.local/sources/ \n \
+        https://.*/.* http://yocto-cache.ci.local/sources/ \n \
+        bzr://.*/.*   http://yocto-cache.ci.local/sources/ \n \
+        cvs://.*/.*   http://yocto-cache.ci.local/sources/ \n \
+        git://.*/.*   http://yocto-cache.ci.local/sources/ \n \
+        gitsm://.*/.* http://yocto-cache.ci.local/sources/ \n \
+        hg://.*/.*    http://yocto-cache.ci.local/sources/ \n \
+        osc://.*/.*   http://yocto-cache.ci.local/sources/ \n \
+        p4://.*/.*    http://yocto-cache.ci.local/sources/ \n \
+        svk://.*/.*   http://yocto-cache.ci.local/sources/ \n \
+        svn://.*/.*   http://yocto-cache.ci.local/sources/ \n \
+        ")
+}
+
+addhandler enable_internal_build
+enable_internal_build[eventmask] = "bb.event.ConfigParsed"

conf/local.conf.sample

@@ -252,21 +252,6 @@ BB_DISKMON_DIRS = "\
 #SSTATE_MIRRORS ?= "\
 #file://.* http://someserver.tld/share/sstate/PATH;downloadfilename=PATH \n \
 #file://.* file:///some/local/dir/sstate/PATH"
-#SSTATE_MIRRORS ?= "file://.* http://yocto-cache.ci.local/sstate-caches/${DISTRO_CODENAME}/PATH"
-
-#PREMIRRORS = "\
-#ftp://.*/.*   http://yocto-cache.ci.local/sources/ \n \
-#http://.*/.*  http://yocto-cache.ci.local/sources/ \n \
-#https://.*/.* http://yocto-cache.ci.local/sources/ \n \
-#bzr://.*/.*   http://yocto-cache.ci.local/sources/ \n \
-#cvs://.*/.*   http://yocto-cache.ci.local/sources/ \n \
-#git://.*/.*   http://yocto-cache.ci.local/sources/ \n \
-#gitsm://.*/.* http://yocto-cache.ci.local/sources/ \n \
-#hg://.*/.*    http://yocto-cache.ci.local/sources/ \n \
-#osc://.*/.*   http://yocto-cache.ci.local/sources/ \n \
-#p4://.*/.*    http://yocto-cache.ci.local/sources/ \n \
-#svk://.*/.*   http://yocto-cache.ci.local/sources/ \n \
-#svn://.*/.*   http://yocto-cache.ci.local/sources/ \n"
 
 #
 # Qemu configuration
@@ -286,6 +271,7 @@ CONF_VERSION = "1"
 
 INHERIT += "rm_work"
 INHERIT += "image-buildinfo"
+INHERIT += "internal-build"
 
 ACCEPT_FSL_EULA = "1"
 LICENSE_FLAGS_WHITELIST = "commercial"