$ git clone -n https://src.fedoraproject.org/rpms/perl-Sys-Syslog.git /var/lib/mock/f41-build-815695-149688/root/chroot_tmpdir/scmroot/perl-Sys-Syslog
Cloning into '/var/lib/mock/f41-build-815695-149688/root/chroot_tmpdir/scmroot/perl-Sys-Syslog'...
$ git fetch origin 19e62b22c09bcbfce40a1a2dcf5d68bad200cb1a:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Sys-Syslog
 * [new ref]         19e62b22c09bcbfce40a1a2dcf5d68bad200cb1a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 19e62b2 Increase release to favour standalone package