$ git clone -n https://src.fedoraproject.org/rpms/rust-data-encoding.git /var/lib/mock/f39-build-2248007-53929/root/chroot_tmpdir/scmroot/rust-data-encoding
Cloning into '/var/lib/mock/f39-build-2248007-53929/root/chroot_tmpdir/scmroot/rust-data-encoding'...
$ git fetch origin f17c30ef12421b25e306a312bacd19e38e043fdb:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-data-encoding
 * [new ref]         f17c30ef12421b25e306a312bacd19e38e043fdb -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at f17c30e Update to version 2.5.0; Fixes RHBZ#2250928