$ git clone -n https://src.fedoraproject.org/rpms/perl-SVN-Look.git /var/lib/mock/f45-build-26105-614/root/chroot_tmpdir/scmroot/perl-SVN-Look
Cloning into '/var/lib/mock/f45-build-26105-614/root/chroot_tmpdir/scmroot/perl-SVN-Look'...
$ git fetch origin 703c0669b9c171728a3a3c20fbea8f87acd9021e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-SVN-Look
 * [new ref]         703c0669b9c171728a3a3c20fbea8f87acd9021e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 703c066 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild