--- poetry-core-1.0.7/poetry/core/vcs/__init__.py.orig	2022-02-17 06:29:13.585868700 +0100
+++ poetry-core-1.0.7/poetry/core/vcs/__init__.py	2022-02-17 06:29:14.200731000 +0100
@@ -8,23 +8,26 @@
 
 
 def get_vcs(directory):  # type: (Path) -> Git
-    working_dir = Path.cwd()
-    os.chdir(str(directory.resolve()))
+    cwd = str(directory.resolve())
 
     try:
         from .git import executable
 
         git_dir = decode(
             subprocess.check_output(
-                [executable(), "rev-parse", "--show-toplevel"], stderr=subprocess.STDOUT
+                [executable(), "rev-parse", "--show-prefix"], stderr=subprocess.STDOUT,
+                cwd=cwd
             )
         ).strip()
+        git_dir = git_dir.strip()[:-1]  # remove the trailing os.sep
+        if not git_dir:
+            git_dir = cwd
+        else:
+            git_dir = cwd[:-len(git_dir)]
 
         vcs = Git(Path(git_dir))
 
     except (subprocess.CalledProcessError, OSError, RuntimeError):
         vcs = None
-    finally:
-        os.chdir(str(working_dir))
 
     return vcs