From 001dfc80a1d29f0e9e64d6f9c6d9e1098d0479ba Mon Sep 17 00:00:00 2001
From: Frost Ming <mianghong@gmail.com>
Date: Thu, 8 Jun 2023 11:48:36 +0800
Subject: [PATCH] fix: raise an error when SCM version can't be determined
 (#180)

---
 src/pdm/backend/hooks/version/scm.py | 11 ++++++-----
 1 file changed, 6 insertions(+), 5 deletions(-)

diff --git a/src/pdm/backend/hooks/version/scm.py b/src/pdm/backend/hooks/version/scm.py
index 7ed9ee5..64c975d 100644
--- a/src/pdm/backend/hooks/version/scm.py
+++ b/src/pdm/backend/hooks/version/scm.py
@@ -332,8 +332,9 @@ def get_version_from_scm(root: str | Path, *, tag_regex: str | None = None) -> s
     for func in (git_parse_version, hg_parse_version):
         version = func(root, config)  # type: ignore
         if version:
-            break
-    else:
-        version = meta(config, "0.0.0")
-    assert version is not None
-    return format_version(version)
+            return format_version(version)
+    raise ValueError(
+        "Cannot find the version from SCM or SCM isn't detected. \n"
+        "You can still specify the version via environment variable "
+        "`PDM_BUILD_SCM_VERSION`."
+    )