$ git clone -n https://src.fedoraproject.org/rpms/libmpcdec.git /var/lib/mock/f45-build-16616-488/root/chroot_tmpdir/scmroot/libmpcdec
Cloning into '/var/lib/mock/f45-build-16616-488/root/chroot_tmpdir/scmroot/libmpcdec'...
$ git fetch origin 074f9da73720e59ca981a29d9f3e06b696a300f8:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libmpcdec
 * [new ref]         074f9da73720e59ca981a29d9f3e06b696a300f8 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 074f9da Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild