$ git clone -n https://src.fedoraproject.org/rpms/rust-siphasher.git /var/lib/mock/f45-build-45003-820/root/chroot_tmpdir/scmroot/rust-siphasher
Cloning into '/var/lib/mock/f45-build-45003-820/root/chroot_tmpdir/scmroot/rust-siphasher'...
$ git fetch origin cb8644d441e1c7dd34c0770d6b5b97da2da3f856:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-siphasher
 * [new ref]         cb8644d441e1c7dd34c0770d6b5b97da2da3f856 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at cb8644d Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild