$ git clone -n https://src.fedoraproject.org/rpms/libecb.git /var/lib/mock/f45-build-16128-483/root/chroot_tmpdir/scmroot/libecb
Cloning into '/var/lib/mock/f45-build-16128-483/root/chroot_tmpdir/scmroot/libecb'...
$ git fetch origin 839c967a8a759166dd8c952cbcda6e832fda0a3e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libecb
 * [new ref]         839c967a8a759166dd8c952cbcda6e832fda0a3e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 839c967 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild