$ git clone -n https://src.fedoraproject.org/rpms/python-gitdb.git /var/lib/mock/f45-build-30874-648/root/chroot_tmpdir/scmroot/python-gitdb
Cloning into '/var/lib/mock/f45-build-30874-648/root/chroot_tmpdir/scmroot/python-gitdb'...
$ git fetch origin 21721d84ff7880241c66b09c0425aa7eba41793c:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/python-gitdb
 * [new ref]         21721d84ff7880241c66b09c0425aa7eba41793c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 21721d8 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild