$ git clone -n https://src.fedoraproject.org/rpms/perl-WebService-Dropbox.git /var/lib/mock/f45-build-27421-624/root/chroot_tmpdir/scmroot/perl-WebService-Dropbox
Cloning into '/var/lib/mock/f45-build-27421-624/root/chroot_tmpdir/scmroot/perl-WebService-Dropbox'...
$ git fetch origin b1c9079047c314a4db713ef7acb9ae019d608f95:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-WebService-Dropbox
 * [new ref]         b1c9079047c314a4db713ef7acb9ae019d608f95 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b1c9079 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild