$ git clone -n https://src.fedoraproject.org/rpms/rust-object.git /var/lib/mock/f39-build-1962619-43271/root/chroot_tmpdir/scmroot/rust-object
Cloning into '/var/lib/mock/f39-build-1962619-43271/root/chroot_tmpdir/scmroot/rust-object'...
$ git fetch origin 5cebf02d5f2d8f2ab83a12d00d63297a1abb29fe:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-object
 * [new ref]         5cebf02d5f2d8f2ab83a12d00d63297a1abb29fe -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 5cebf02 Update to version 0.32.1; Fixes RHBZ#2186956