$ git clone -n https://src.fedoraproject.org/rpms/rust-git-version.git /var/lib/mock/f39-build-1521692-35855/root/chroot_tmpdir/scmroot/rust-git-version
Cloning into '/var/lib/mock/f39-build-1521692-35855/root/chroot_tmpdir/scmroot/rust-git-version'...
$ git fetch origin 8d727d9323e72348b15f6cd6b7e455b151d28179:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-git-version
 * [new ref]         8d727d9323e72348b15f6cd6b7e455b151d28179 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 8d727d9 Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild