$ git clone -n https://src.fedoraproject.org/rpms/shadow-utils.git /var/lib/mock/f40-build-786683-134497/root/chroot_tmpdir/scmroot/shadow-utils
Cloning into '/var/lib/mock/f40-build-786683-134497/root/chroot_tmpdir/scmroot/shadow-utils'...
$ git fetch origin fb4d9302930511096134f042c54aaa360a7af8e2:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/shadow-utils
 * [new ref]         fb4d9302930511096134f042c54aaa360a7af8e2 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at fb4d930 Rebase to version 4.15.0rc2