When svn does not know the password and it has to prompt, it needs to query.
However it won't when invoked from the Python script and instead fails with:
svn:
E215004: Authentication failed and interactive prompting is disabled; see the --force-interactive option
Differential Revision: https://reviews.llvm.org/D27274
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@288266
91177308-0d34-0410-b5e6-
96231b3b80d8