$ git clone -n https://src.fedoraproject.org/rpms/libdb.git /var/lib/mock/f45-build-16163-483/root/chroot_tmpdir/scmroot/libdb
Cloning into '/var/lib/mock/f45-build-16163-483/root/chroot_tmpdir/scmroot/libdb'...
$ git fetch origin 33d305ef13173c7ac71f13f6fe48795da013509a:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libdb
 * [new ref]         33d305ef13173c7ac71f13f6fe48795da013509a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 33d305e Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild