$ git clone -n https://src.fedoraproject.org/rpms/perl-Devel-Leak.git /var/lib/mock/f45-build-23188-596/root/chroot_tmpdir/scmroot/perl-Devel-Leak
Cloning into '/var/lib/mock/f45-build-23188-596/root/chroot_tmpdir/scmroot/perl-Devel-Leak'...
$ git fetch origin 334a9e9f57825572a4ddd23468a43daae2ce6b1c:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Devel-Leak
 * [new ref]         334a9e9f57825572a4ddd23468a43daae2ce6b1c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 334a9e9 Perl 5.44 rebuild