$ git clone -n https://src.fedoraproject.org/rpms/perl-Algorithm-Diff-XS.git /var/lib/mock/f45-build-21640-587/root/chroot_tmpdir/scmroot/perl-Algorithm-Diff-XS
Cloning into '/var/lib/mock/f45-build-21640-587/root/chroot_tmpdir/scmroot/perl-Algorithm-Diff-XS'...
$ git fetch origin e267bd3f14cb351b681f3d134639fcaded4c63f2:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Algorithm-Diff-XS
 * [new ref]         e267bd3f14cb351b681f3d134639fcaded4c63f2 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at e267bd3 Perl 5.44 rebuild