$ git clone -n https://src.fedoraproject.org/rpms/perl-Devel-Leak.git /var/lib/mock/f41-build-815855-149783/root/chroot_tmpdir/scmroot/perl-Devel-Leak
Cloning into '/var/lib/mock/f41-build-815855-149783/root/chroot_tmpdir/scmroot/perl-Devel-Leak'...
$ git fetch origin d927ec24c47a1eaf2ac66d0f8a3002bb84c673fd:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Devel-Leak
 * [new ref]         d927ec24c47a1eaf2ac66d0f8a3002bb84c673fd -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at d927ec2 Perl 5.40 rebuild