$ git clone -n https://src.fedoraproject.org/rpms/rust-vergen.git /var/lib/mock/f40-build-2131212-50798/root/chroot_tmpdir/scmroot/rust-vergen
Cloning into '/var/lib/mock/f40-build-2131212-50798/root/chroot_tmpdir/scmroot/rust-vergen'...
$ git fetch origin 0007704ed3fd179d03588145dcfe1b844ed9c2e4:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-vergen
 * [new ref]         0007704ed3fd179d03588145dcfe1b844ed9c2e4 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 0007704 Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild