2 files changed, 59 insertions, 0 deletions
diff --git a/youtube/get_app_version/__init__.py b/youtube/get_app_version/__init__.py
new file mode 100644
index 0000000..665b7b5
--- /dev/null
+++ b/youtube/get_app_version/__init__.py
@@ -0,0 +1,3 @@
+from .get_app_version import app_version
+
+__all__ = ['app_version']
diff --git a/youtube/get_app_version/get_app_version.py b/youtube/get_app_version/get_app_version.py
new file mode 100644
index 0000000..a73b857
--- /dev/null
+++ b/youtube/get_app_version/get_app_version.py
@@ -0,0 +1,56 @@
+from __future__ import unicode_literals
+import os
+import shutil
+import subprocess
+
+from ..version import __version__
+
+
+def app_version():
+    def minimal_env_cmd(cmd):
+        # make minimal environment
+        env = {k: os.environ[k] for k in ['SYSTEMROOT', 'PATH'] if k in os.environ}
+        env.update({'LANGUAGE': 'C', 'LANG': 'C', 'LC_ALL': 'C'})
+        out = subprocess.Popen(cmd, stdout=subprocess.PIPE, env=env).communicate()[0]
+        return out
+
+    subst_list = {
+        'version': __version__,
+        'branch': None,
+        'commit': None,
+    }
+
+    # Use shutil.which instead of `command -v`/os.system so we don't spawn a
+    # shell (CWE-78 hardening) and so it works cross-platform.
+    if shutil.which('git') is None:
+        return subst_list
+
+    try:
+        # Check we are inside a git work tree. Using DEVNULL avoids the
+        # file-handle leak from `open(os.devnull, 'w')`.
+        rc = subprocess.call(
+            ['git', 'branch'],
+            stderr=subprocess.DEVNULL,
+            stdout=subprocess.DEVNULL,
+        )
+    except OSError:
+        return subst_list
+    if rc != 0:
+        return subst_list
+
+    describe = minimal_env_cmd(['git', 'describe', '--tags', '--always'])
+    git_revision = describe.strip().decode('ascii')
+
+    branch = minimal_env_cmd(['git', 'branch'])
+    git_branch = branch.strip().decode('ascii').replace('* ', '')
+
+    subst_list.update({
+        'branch': git_branch,
+        'commit': git_revision,
+    })
+
+    return subst_list
+
+
+if __name__ == '__main__':
+    app_version()