$ git clone -n https://src.fedoraproject.org/rpms/rust-futf.git /var/lib/mock/f39-build-1493597-34539/root/chroot_tmpdir/scmroot/rust-futf
Cloning into '/var/lib/mock/f39-build-1493597-34539/root/chroot_tmpdir/scmroot/rust-futf'...
$ git fetch origin f88e9f1e6712e87b7ba39a9753830aec93f149af:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-futf
 * [new ref]         f88e9f1e6712e87b7ba39a9753830aec93f149af -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at f88e9f1 Regenerate with rust2rpm v24