$ git clone -n https://src.fedoraproject.org/rpms/perl-Kwiki-Diff.git /var/lib/mock/f45-build-24345-603/root/chroot_tmpdir/scmroot/perl-Kwiki-Diff
Cloning into '/var/lib/mock/f45-build-24345-603/root/chroot_tmpdir/scmroot/perl-Kwiki-Diff'...
$ git fetch origin dcee29a66d30edf4e14dd5057a405d4535253c75:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Kwiki-Diff
 * [new ref]         dcee29a66d30edf4e14dd5057a405d4535253c75 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at dcee29a Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild