$ git clone -n https://src.fedoraproject.org/rpms/perl-Gearman.git /var/lib/mock/f45-build-23753-599/root/chroot_tmpdir/scmroot/perl-Gearman
Cloning into '/var/lib/mock/f45-build-23753-599/root/chroot_tmpdir/scmroot/perl-Gearman'...
$ git fetch origin b5c8509136f7aa6f54146c431fa0ee8d18ed9cb9:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Gearman
 * [new ref]         b5c8509136f7aa6f54146c431fa0ee8d18ed9cb9 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b5c8509 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild