$ git clone -n https://src.fedoraproject.org/rpms/rust-document-features.git /var/lib/mock/f39-build-2179219-51130/root/chroot_tmpdir/scmroot/rust-document-features
Cloning into '/var/lib/mock/f39-build-2179219-51130/root/chroot_tmpdir/scmroot/rust-document-features'...
$ git fetch origin ae963203cd7dbc007d14b55eab1160b40a6889f6:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-document-features
 * [new ref]         ae963203cd7dbc007d14b55eab1160b40a6889f6 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ae96320 Update to version 0.2.8; Fixes RHBZ#2256169