$ git clone -n https://src.fedoraproject.org/rpms/rust-either.git /var/lib/mock/f39-build-1517055-35679/root/chroot_tmpdir/scmroot/rust-either
Cloning into '/var/lib/mock/f39-build-1517055-35679/root/chroot_tmpdir/scmroot/rust-either'...
$ git fetch origin a2bc9b5c27373dc51aace7c7886ecafe5b0d1ef9:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-either
 * [new ref]         a2bc9b5c27373dc51aace7c7886ecafe5b0d1ef9 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at a2bc9b5 Update to version 1.9.0; Fixes RHBZ#2224679