$ git clone -n https://src.fedoraproject.org/rpms/perl-Data-Printer.git /var/lib/mock/f39-build-1453138-32872/root/chroot_tmpdir/scmroot/perl-Data-Printer
Cloning into '/var/lib/mock/f39-build-1453138-32872/root/chroot_tmpdir/scmroot/perl-Data-Printer'...
$ git fetch origin 543c3fa8367f10d81f01d30617ff45704fb21fd7:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Data-Printer
 * [new ref]         543c3fa8367f10d81f01d30617ff45704fb21fd7 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 543c3fa Update to 1.001001