$ git clone -n https://src.fedoraproject.org/rpms/perl-Devel-Symdump.git /var/lib/mock/f45-build-23145-596/root/chroot_tmpdir/scmroot/perl-Devel-Symdump
Cloning into '/var/lib/mock/f45-build-23145-596/root/chroot_tmpdir/scmroot/perl-Devel-Symdump'...
$ git fetch origin b8fec91f2cf4afccaf1161436e8a2e102e454f05:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Devel-Symdump
 * [new ref]         b8fec91f2cf4afccaf1161436e8a2e102e454f05 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b8fec91 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild