$ git clone -n https://src.fedoraproject.org/rpms/perl-String-Format.git /var/lib/mock/f45-build-26283-616/root/chroot_tmpdir/scmroot/perl-String-Format
Cloning into '/var/lib/mock/f45-build-26283-616/root/chroot_tmpdir/scmroot/perl-String-Format'...
$ git fetch origin 1f166f92eaab89e47c10f0c56bb5453db181124e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-String-Format
 * [new ref]         1f166f92eaab89e47c10f0c56bb5453db181124e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 1f166f9 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild