yocto-bsp: allow branch display filtering

Add a "branches_base" property that can be used to allow only matching
branches to be returned from all_branches().

Signed-off-by: Tom Zanussi <tom.zanussi@intel.com>

scripts/lib/bsp/kernel.py

@@ -711,6 +711,16 @@ def all_branches(context):
     tmp = os.popen(gitcmd).read()
 
     branches = []
+    base_prefixes = None
+
+    try:
+        branches_base = context["branches_base"]
+        if branches_base:
+            base_prefixes = branches_base.split(":")
+    except KeyError:
+        pass
+
+    arch = context["arch"]
 
     if tmp:
         tmpline = tmp.split("\n")
@@ -719,6 +729,14 @@ def all_branches(context):
                 break;
             idx = line.find("refs/heads/")
             kbranch = line[idx + len("refs/heads/"):]
+            kbranch_prefix = kbranch.rsplit("/", 1)[0]
+
+            if base_prefixes:
+                for base_prefix in base_prefixes:
+                    if kbranch_prefix == base_prefix:
+                        branches.append(kbranch)
+                continue
+
             if (kbranch.find("/") != -1 and
                 (kbranch.find("standard") != -1 or kbranch.find("base") != -1) or
                 kbranch == "base"):