diff --git a/tools/workspace-status.sh b/tools/workspace-status.sh
deleted file mode 100755
index 9cc40e9..0000000
--- a/tools/workspace-status.sh
+++ /dev/null
@@ -1,17 +0,0 @@
-#!/usr/bin/env bash
-
-# This script will be run by bazel when the build process starts to
-# generate key-value information that represents the status of the
-# workspace. The output should be like
-#
-# KEY1 VALUE1
-# KEY2 VALUE2
-#
-# If the script exits with non-zero code, it's considered as a failure
-# and the output will be discarded.
-
-function rev() {
-  cd $1; git describe --always --match "v[0-9].*" --dirty
-}
-
-echo STABLE_BUILD_GITILES_LABEL $(rev .)
diff --git a/tools/workspace_status.py b/tools/workspace_status.py
new file mode 100644
index 0000000..aae9318
--- /dev/null
+++ b/tools/workspace_status.py
@@ -0,0 +1,38 @@
+#!/usr/bin/env python3
+
+# This script will be run by bazel when the build process starts to
+# generate key-value information that represents the status of the
+# workspace. The output should be like
+#
+# KEY1 VALUE1
+# KEY2 VALUE2
+#
+# If the script exits with non-zero code, it's considered as a failure
+# and the output will be discarded.
+
+from __future__ import print_function
+import os
+import subprocess
+import sys
+
+ROOT = os.path.abspath(__file__)
+while not os.path.exists(os.path.join(ROOT, 'WORKSPACE')):
+    ROOT = os.path.dirname(ROOT)
+CMD = ['git', 'describe', '--always', '--match', 'v[0-9].*', '--dirty']
+
+
+def revision(directory, parent):
+    try:
+        os.chdir(directory)
+        return subprocess.check_output(CMD).strip().decode("utf-8")
+    except OSError as err:
+        print('could not invoke git: %s' % err, file=sys.stderr)
+        sys.exit(1)
+    except subprocess.CalledProcessError as err:
+        # ignore "not a git repository error" to report unknown version
+        return None
+    finally:
+        os.chdir(parent)
+
+
+print("STABLE_BUILD_GITILES_LABEL %s" % revision(ROOT, ROOT))