$ git clone -n https://src.fedoraproject.org/rpms/perl-Devel-Cover.git /var/lib/mock/f41-build-816814-150442/root/chroot_tmpdir/scmroot/perl-Devel-Cover
Cloning into '/var/lib/mock/f41-build-816814-150442/root/chroot_tmpdir/scmroot/perl-Devel-Cover'...
$ git fetch origin f5d4b4de9517c9d77e4dd41420c0c1a7255df10d:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Devel-Cover
 * [new ref]         f5d4b4de9517c9d77e4dd41420c0c1a7255df10d -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at f5d4b4d Perl 5.40 rebuild