conf.py/poky.yaml: Move version information to poky.yaml and read in conf.py

Merge in the changes from master allowing conf.py to use information from
poky.yaml. This allows the head version mapped to X.999 on the website to
have the version information displayed clearly and correctly.

(From yocto-docs rev: f462982ddb6e32052217d44c0c44e8a4df115589)

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

documentation/conf.py

@@ -15,9 +15,27 @@
 import os
 import sys
 import datetime
+try:
+    import yaml
+except ImportError:
+    sys.stderr.write("The Yocto Project Sphinx documentation requires PyYAML.\
+    \nPlease make sure to install pyyaml python package.\n")
+    sys.exit(1)
 
-current_version = "3.3.6"
-bitbake_version = "1.50"
+# current_version = "dev"
+# bitbake_version = "" # Leave empty for development branch
+# Obtain versions from poky.yaml instead
+with open("poky.yaml") as data:
+    buff = data.read()
+    subst_vars = yaml.safe_load(buff)
+    if "DOCCONF_VERSION" not in subst_vars:
+        sys.stderr.write("Please set DOCCONF_VERSION in poky.yaml")
+        sys.exit(1)
+    current_version = subst_vars["DOCCONF_VERSION"]
+    if "BITBAKE_SERIES" not in subst_vars:
+        sys.stderr.write("Please set BITBAKE_SERIES in poky.yaml")
+        sys.exit(1)
+    bitbake_version = subst_vars["BITBAKE_SERIES"]
 
 # String used in sidebar
 version = 'Version: ' + current_version

documentation/poky.yaml

@@ -6,6 +6,8 @@ DISTRO_NAME_NO_CAP_LTS : "gatesgarth"
 YOCTO_DOC_VERSION : "3.3.6"
 YOCTO_DOC_VERSION_MINUS_ONE : "3.2.4"
 DISTRO_REL_TAG : "yocto-3.3.6"
+DOCCONF_VERSION : "3.3.6"
+BITBAKE_SERIES : "1.50"
 POKYVERSION : "25.0.6"
 YOCTO_POKY : "poky-&DISTRO_NAME_NO_CAP;-&POKYVERSION;"
 YOCTO_DL_URL : "https://downloads.yoctoproject.org"