$ git clone -n https://src.fedoraproject.org/rpms/perl-Type-Tiny-XS.git /var/lib/mock/f43-perl-60957737-6586764/root/chroot_tmpdir/scmroot/perl-Type-Tiny-XS
Cloning into '/var/lib/mock/f43-perl-60957737-6586764/root/chroot_tmpdir/scmroot/perl-Type-Tiny-XS'...
$ git fetch origin f45a0569c80cf2dc5b37ba56ba0d26f15aeb4a20:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Type-Tiny-XS
 * [new ref]         f45a0569c80cf2dc5b37ba56ba0d26f15aeb4a20 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at f45a056 Perl 5.42 rebuild