$ git clone -n https://src.fedoraproject.org/rpms/rust-bugreport.git /var/lib/mock/f40-build-2053828-49096/root/chroot_tmpdir/scmroot/rust-bugreport
Cloning into '/var/lib/mock/f40-build-2053828-49096/root/chroot_tmpdir/scmroot/rust-bugreport'...
$ git fetch origin fbfadbd02cbc34b259da0d30c15ab116e6bf0038:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-bugreport
 * [new ref]         fbfadbd02cbc34b259da0d30c15ab116e6bf0038 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at fbfadbd Regenerate with rust2rpm v24