$ git clone -n https://src.fedoraproject.org/rpms/perl-CPAN-Common-Index.git /var/lib/mock/f45-build-21974-589/root/chroot_tmpdir/scmroot/perl-CPAN-Common-Index
Cloning into '/var/lib/mock/f45-build-21974-589/root/chroot_tmpdir/scmroot/perl-CPAN-Common-Index'...
$ git fetch origin 2abdc70d9eab0141bf4fe8500d57b2cff2ae3f5a:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-CPAN-Common-Index
 * [new ref]         2abdc70d9eab0141bf4fe8500d57b2cff2ae3f5a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 2abdc70 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild