$ git clone -n https://src.fedoraproject.org/rpms/rust-git2_0.16.git /var/lib/mock/f40-build-2353469-60255/root/chroot_tmpdir/scmroot/rust-git2_0.16
Cloning into '/var/lib/mock/f40-build-2353469-60255/root/chroot_tmpdir/scmroot/rust-git2_0.16'...
$ git fetch origin 7e139dcd0bb1f0ace61b4bdae52521fec55c2cb3:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-git2_0.16
 * [new ref]         7e139dcd0bb1f0ace61b4bdae52521fec55c2cb3 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 7e139dc Rebuilt for https://fedoraproject.org/wiki/Fedora_40_Mass_Rebuild