$ git clone -n https://src.fedoraproject.org/rpms/rust-predicates-tree.git /var/lib/mock/f38-build-side-42-init-devel-1394846-31050/root/chroot_tmpdir/scmroot/rust-predicates-tree
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-1394846-31050/root/chroot_tmpdir/scmroot/rust-predicates-tree'...
$ git fetch origin 22771b36495fe82b4619c06bb481f7362f4904c6:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-predicates-tree
 * [new ref]         22771b36495fe82b4619c06bb481f7362f4904c6 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 22771b3 Update to version 1.0.9; Fixes RHBZ#2178704