$ git clone -n https://src.fedoraproject.org/rpms/rust-blocking.git /var/lib/mock/f39-build-2151820-50907/root/chroot_tmpdir/scmroot/rust-blocking
Cloning into '/var/lib/mock/f39-build-2151820-50907/root/chroot_tmpdir/scmroot/rust-blocking'...
$ git fetch origin 9d24cca1db31b300e5ec08577ff7542bcaeead5c:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-blocking
 * [new ref]         9d24cca1db31b300e5ec08577ff7542bcaeead5c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 9d24cca Update to version 1.4.1