$ git clone -n https://src.fedoraproject.org/rpms/rust-prost.git /var/lib/mock/f40-build-2209372-52150/root/chroot_tmpdir/scmroot/rust-prost
Cloning into '/var/lib/mock/f40-build-2209372-52150/root/chroot_tmpdir/scmroot/rust-prost'...
$ git fetch origin 853e6d1910f70bff430b1400f5a3fc24ee635777:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-prost
 * [new ref]         853e6d1910f70bff430b1400f5a3fc24ee635777 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 853e6d1 Regenerate with rust2rpm v25