$ git clone -n https://src.fedoraproject.org/rpms/perl-Devel-Leak.git /var/lib/mock/f43-perl-60949979-6586679/root/chroot_tmpdir/scmroot/perl-Devel-Leak
Cloning into '/var/lib/mock/f43-perl-60949979-6586679/root/chroot_tmpdir/scmroot/perl-Devel-Leak'...
$ git fetch origin d5e96d19d82637a34bcca74cdf91e3a2e06d52c0:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Devel-Leak
 * [new ref]         d5e96d19d82637a34bcca74cdf91e3a2e06d52c0 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at d5e96d1 Perl 5.42 rebuild