$ git clone -n https://src.fedoraproject.org/rpms/rust-env_logger.git /var/lib/mock/f40-build-2072304-49334/root/chroot_tmpdir/scmroot/rust-env_logger
Cloning into '/var/lib/mock/f40-build-2072304-49334/root/chroot_tmpdir/scmroot/rust-env_logger'...
$ git fetch origin 7b29d99a1772776ea1aaa677c9bd3d82a7e5f8d2:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-env_logger
 * [new ref]         7b29d99a1772776ea1aaa677c9bd3d82a7e5f8d2 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 7b29d99 Update to version 0.10.1; Fixes RHBZ#2249086