$ git clone -n https://src.fedoraproject.org/rpms/libiec61883.git /var/lib/mock/f45-build-16336-485/root/chroot_tmpdir/scmroot/libiec61883
Cloning into '/var/lib/mock/f45-build-16336-485/root/chroot_tmpdir/scmroot/libiec61883'...
$ git fetch origin dcc50e88fb38e1facb8c78acf3c6eb502e078d2a:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libiec61883
 * [new ref]         dcc50e88fb38e1facb8c78acf3c6eb502e078d2a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at dcc50e8 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild