$ git clone -n https://src.fedoraproject.org/rpms/python-extension-helpers.git /var/lib/mock/f45-build-30580-646/root/chroot_tmpdir/scmroot/python-extension-helpers
Cloning into '/var/lib/mock/f45-build-30580-646/root/chroot_tmpdir/scmroot/python-extension-helpers'...
$ git fetch origin 345f4ff298256e58813e0d7b3f9ccf1f19c56625:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/python-extension-helpers
 * [new ref]         345f4ff298256e58813e0d7b3f9ccf1f19c56625 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 345f4ff Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild