$ git clone -n https://src.fedoraproject.org/rpms/rust-dtoa-short.git /var/lib/mock/f39-build-1517035-35676/root/chroot_tmpdir/scmroot/rust-dtoa-short
Cloning into '/var/lib/mock/f39-build-1517035-35676/root/chroot_tmpdir/scmroot/rust-dtoa-short'...
$ git fetch origin 81b789ea76b5bd0a2d5d165bd43b5d02d34855b4:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-dtoa-short
 * [new ref]         81b789ea76b5bd0a2d5d165bd43b5d02d34855b4 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 81b789e Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild