$ git clone -n https://src.fedoraproject.org/rpms/perl-Check-ISA.git /var/lib/mock/f45-build-22263-590/root/chroot_tmpdir/scmroot/perl-Check-ISA
Cloning into '/var/lib/mock/f45-build-22263-590/root/chroot_tmpdir/scmroot/perl-Check-ISA'...
$ git fetch origin 21f0190fc77b41177c52263c154dae333032fe21:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Check-ISA
 * [new ref]         21f0190fc77b41177c52263c154dae333032fe21 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 21f0190 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild