$ git clone -n https://src.fedoraproject.org/rpms/rust-headers-core0.2.git /var/lib/mock/f45-build-42301-792/root/chroot_tmpdir/scmroot/rust-headers-core0.2
Cloning into '/var/lib/mock/f45-build-42301-792/root/chroot_tmpdir/scmroot/rust-headers-core0.2'...
$ git fetch origin c137d7e73a6eb1e0c6ce0a447d5db118607ed238:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-headers-core0.2
 * [new ref]         c137d7e73a6eb1e0c6ce0a447d5db118607ed238 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at c137d7e Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild