meta: rename kernel to Magenta

tools/magenta.buildid

@@ -0,0 +1,39 @@
+#!/usr/bin/env python3
+# vim: ft=python
+# -*- mode: python -*-
+
+import subprocess
+import sys
+
+
+def is_arg_set(name):
+    for arg in sys.argv:
+        if arg == '--{}'.format(name):
+            return True
+
+    return False
+
+
+def get_arg(name):
+    ret_next = False
+    for arg in sys.argv:
+        if ret_next:
+            return arg
+
+        if arg == '--{}'.format(name):
+            ret_next = True
+
+    return ''
+
+
+arch = get_arg('arch')
+
+build_type = 'debug'
+if is_arg_set('release'):
+    build_type = 'release'
+
+current_tag = subprocess.check_output(['git', 'describe', '--tags', '--abbrev=0']).decode('utf-8').strip()
+current_tag = current_tag[1:]
+
+build_id = '{}/{}_{}'.format(current_tag, build_type, arch)
+print('{}'.format(build_id.upper()))