$ git clone -n https://src.fedoraproject.org/rpms/paper-icon-theme.git /var/lib/mock/f45-build-21370-584/root/chroot_tmpdir/scmroot/paper-icon-theme
Cloning into '/var/lib/mock/f45-build-21370-584/root/chroot_tmpdir/scmroot/paper-icon-theme'...
$ git fetch origin 5207b05cc3e4355481c46bca6df0e9328efe9f52:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/paper-icon-theme
 * [new ref]         5207b05cc3e4355481c46bca6df0e9328efe9f52 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 5207b05 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild