Merge pull request #465 from GitGuardian/plalanne/-/improve-git-error…

…-management

Improve error management to better catch some git errors

ggshield/core/git_shell.py

@@ -82,6 +82,17 @@ def git(
             cwd=cwd,
         )
         return result.stdout.decode("utf-8", errors="ignore").rstrip()
+    except subprocess.CalledProcessError as e:
+        if "detected dubious ownership in repository" in e.stderr.decode(
+            "utf-8", errors="ignore"
+        ):
+            raise UnexpectedError(
+                "Git command failed because of a dubious ownership in repository.\n"
+                "If you still want to run ggshield, make sure you mark "
+                "the current repository as safe for git with:\n"
+                "   git config --global --add safe.repository <YOUR_REPO>"
+            )
+        raise e
     except subprocess.TimeoutExpired:
         raise click.Abort('Command "{}" timed out'.format(" ".join(command)))