Build: make update support for git tags

Previously it only picked the appropriate version with the
blender-vX.XX-release branches.

build_files/utils/make_test.py

@@ -40,7 +40,8 @@ if make_utils.command_missing(git_command):
 
 # Test if we are building a specific release version.
 branch = make_utils.git_branch(git_command)
-release_version = make_utils.git_branch_release_version(branch)
+tag = make_utils.git_tag(git_command)
+release_version = make_utils.git_branch_release_version(branch, tag)
 lib_tests_dirpath = os.path.join('..', 'lib', "tests")
 
 if not os.path.exists(lib_tests_dirpath):

build_files/utils/make_update.py

@@ -197,7 +197,8 @@ if __name__ == "__main__":
 
     # Test if we are building a specific release version.
     branch = make_utils.git_branch(args.git_command)
-    release_version = make_utils.git_branch_release_version(branch)
+    tag = make_utils.git_tag(args.git_command)
+    release_version = make_utils.git_branch_release_version(branch, tag)
 
     if not args.no_libraries:
         svn_update(args, release_version)

build_files/utils/make_utils.py

@@ -36,7 +36,7 @@ def check_output(cmd, exit_on_error=True):
     return output.strip()
 
 def git_branch(git_command):
-    # Test if we are building a specific release version.
+    # Get current branch name.
     try:
         branch = subprocess.check_output([git_command, "rev-parse", "--abbrev-ref", "HEAD"])
     except subprocess.CalledProcessError as e:
@@ -45,10 +45,23 @@ def git_branch(git_command):
 
     return branch.strip().decode('utf8')
 
-def git_branch_release_version(branch):
+def git_tag(git_command):
+    # Get current tag name.
+    try:
+        tag = subprocess.check_output([git_command, "describe", "--exact-match"])
+    except subprocess.CalledProcessError as e:
+        return None
+
+    return tag.strip().decode('utf8')
+
+def git_branch_release_version(branch, tag):
     release_version = re.search("^blender-v(.*)-release$", branch)
     if release_version:
         release_version = release_version.group(1)
+    elif tag:
+        release_version = re.search("^v([0-9]*\.[0-9]*).*", tag)
+        if release_version:
+            release_version = release_version.group(1)
     return release_version
 
 def svn_libraries_base_url(release_version):