diff --git a/.matplotlib-repo b/.matplotlib-repo
new file mode 100644
index 000000000000..0b1d699bcdb1
--- /dev/null
+++ b/.matplotlib-repo
@@ -0,0 +1,3 @@
+The existence of this file signals that the code is a matplotlib source repo
+and not an installed version. We use this in __init__.py for gating version
+detection.
diff --git a/lib/matplotlib/__init__.py b/lib/matplotlib/__init__.py
index 7df511af1e16..1dcfb827833e 100644
--- a/lib/matplotlib/__init__.py
+++ b/lib/matplotlib/__init__.py
@@ -164,11 +164,13 @@ def _parse_to_version_info(version_str):
def _get_version():
"""Return the version string used for __version__."""
- # Only shell out to a git subprocess if really needed, and not on a
- # shallow clone, such as those used by CI, as the latter would trigger
- # a warning from setuptools_scm.
+ # Only shell out to a git subprocess if really needed, i.e. when we are in
+ # a matplotlib git repo but not in a shallow clone, such as those used by
+ # CI, as the latter would trigger a warning from setuptools_scm.
root = Path(__file__).resolve().parents[2]
- if (root / ".git").exists() and not (root / ".git/shallow").exists():
+ if ((root / ".matplotlib-repo").exists()
+ and (root / ".git").exists()
+ and not (root / ".git/shallow").exists()):
import setuptools_scm
return setuptools_scm.get_version(
root=root,
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