$ git clone -n https://src.fedoraproject.org/rpms/rust-mint.git /var/lib/mock/f39-build-1493979-34542/root/chroot_tmpdir/scmroot/rust-mint
Cloning into '/var/lib/mock/f39-build-1493979-34542/root/chroot_tmpdir/scmroot/rust-mint'...
$ git fetch origin a850b3ce4c475f1330046c2379ba5f6340646ec6:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-mint
 * [new ref]         a850b3ce4c475f1330046c2379ba5f6340646ec6 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at a850b3c Regenerate with rust2rpm v24