$ git clone -n https://src.fedoraproject.org/rpms/perl-Redis-Fast.git /var/lib/mock/f45-build-26015-614/root/chroot_tmpdir/scmroot/perl-Redis-Fast
Cloning into '/var/lib/mock/f45-build-26015-614/root/chroot_tmpdir/scmroot/perl-Redis-Fast'...
$ git fetch origin a0130f03c62e95a2c34b584c19eccd6ab875db1e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Redis-Fast
 * [new ref]         a0130f03c62e95a2c34b584c19eccd6ab875db1e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at a0130f0 Update to 0.39 (RHBZ#2510989)