$ git clone -n https://src.fedoraproject.org/rpms/snappy.git /var/lib/mock/f45-build-36162-701/root/chroot_tmpdir/scmroot/snappy
Cloning into '/var/lib/mock/f45-build-36162-701/root/chroot_tmpdir/scmroot/snappy'...
$ git fetch origin 4c21b8dd2a38169b5993c5ab4aef32a16fedc429:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/snappy
 * [new ref]         4c21b8dd2a38169b5993c5ab4aef32a16fedc429 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 4c21b8d Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild