$ git clone -n https://src.fedoraproject.org/rpms/perl-Test-Some.git /var/lib/mock/f45-build-26853-619/root/chroot_tmpdir/scmroot/perl-Test-Some
Cloning into '/var/lib/mock/f45-build-26853-619/root/chroot_tmpdir/scmroot/perl-Test-Some'...
$ git fetch origin 5185862fcccd353bd0e53a7e8130267c248e00b1:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Test-Some
 * [new ref]         5185862fcccd353bd0e53a7e8130267c248e00b1 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 5185862 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild