git: ignore git tags starting with 'ext/' when getting the version tag

Allows for external/extra tags

CMakeLists.txt

@@ -113,7 +113,7 @@ include(px4_parse_function_args)
 include(px4_git)
 
 execute_process(
-	COMMAND git describe --always --tags
+	COMMAND git describe --exclude ext/* --always --tags
 	OUTPUT_VARIABLE PX4_GIT_TAG
 	OUTPUT_STRIP_TRAILING_WHITESPACE
 	WORKING_DIRECTORY ${PX4_SOURCE_DIR}

Tools/px4.py

@@ -65,7 +65,7 @@ def get_version():
 
     if os.path.isdir(os.path.join(px4_dir, '.git')):
         # If inside a clone PX4 Firmware repository, get version from "git describe"
-        cmd = 'git describe --abbrev=0 --tags'
+        cmd = 'git describe --exclude ext/* --abbrev=0 --tags'
         try:
             version = subprocess.check_output(
                 cmd, cwd=px4_dir, shell=True).decode().strip()

Tools/px_mkfw.py

@@ -99,7 +99,7 @@ if args.summary != None:
 if args.description != None:
 	desc['description']	= str(args.description)
 if args.git_identity != None:
-	cmd = "git --git-dir '{:}/.git' describe --always --tags".format(args.git_identity)
+	cmd = "git --git-dir '{:}/.git' describe --exclude ext/* --always --tags".format(args.git_identity)
 	p = subprocess.Popen(cmd, shell=True, stdout=subprocess.PIPE).stdout
 	desc['git_identity']	= str(p.read().strip())
 	p.close()

src/lib/version/px_update_git_header.py

@@ -37,7 +37,7 @@ header = """
 
 
 # PX4
-git_tag = subprocess.check_output('git describe --always --tags --dirty'.split(),
+git_tag = subprocess.check_output('git describe --exclude ext/* --always --tags --dirty'.split(),
                                   stderr=subprocess.STDOUT).decode('utf-8').strip()
 if validate:
     if verbose: