$ git clone -n https://src.fedoraproject.org/rpms/perl-Date-Calc-XS.git /var/lib/mock/f45-build-22964-595/root/chroot_tmpdir/scmroot/perl-Date-Calc-XS
Cloning into '/var/lib/mock/f45-build-22964-595/root/chroot_tmpdir/scmroot/perl-Date-Calc-XS'...
$ git fetch origin f07746b36cab5b482231120f594829ef24d0c23a:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Date-Calc-XS
 * [new ref]         f07746b36cab5b482231120f594829ef24d0c23a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at f07746b Perl 5.44 rebuild