$ git clone -n https://src.fedoraproject.org/rpms/perl-Algorithm-Diff-XS.git /var/lib/mock/f41-build-816466-150205/root/chroot_tmpdir/scmroot/perl-Algorithm-Diff-XS
Cloning into '/var/lib/mock/f41-build-816466-150205/root/chroot_tmpdir/scmroot/perl-Algorithm-Diff-XS'...
$ git fetch origin 917b4d9cc1ee1408d1da89655f1d0c7a3a828048:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Algorithm-Diff-XS
 * [new ref]         917b4d9cc1ee1408d1da89655f1d0c7a3a828048 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 917b4d9 Perl 5.40 rebuild