$ git clone -n https://src.fedoraproject.org/rpms/rust-xxhash-c-sys.git /var/lib/mock/f45-build-46245-832/root/chroot_tmpdir/scmroot/rust-xxhash-c-sys
Cloning into '/var/lib/mock/f45-build-46245-832/root/chroot_tmpdir/scmroot/rust-xxhash-c-sys'...
$ git fetch origin 82c382f93f114065ed09e91fda3bdd5cddbc5ab6:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-xxhash-c-sys
 * [new ref]         82c382f93f114065ed09e91fda3bdd5cddbc5ab6 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 82c382f Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild