$ git clone -n https://src.fedoraproject.org/rpms/perl-Package-New.git /var/lib/mock/f45-build-25624-612/root/chroot_tmpdir/scmroot/perl-Package-New
Cloning into '/var/lib/mock/f45-build-25624-612/root/chroot_tmpdir/scmroot/perl-Package-New'...
$ git fetch origin 1623566edac1efd4fb803d939366f58cf862350e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Package-New
 * [new ref]         1623566edac1efd4fb803d939366f58cf862350e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 1623566 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild