$ git clone -n https://src.fedoraproject.org/rpms/shadow-utils.git /var/lib/mock/f42-build-side-1-3500280-45970/root/chroot_tmpdir/scmroot/shadow-utils
Cloning into '/var/lib/mock/f42-build-side-1-3500280-45970/root/chroot_tmpdir/scmroot/shadow-utils'...
$ git fetch origin 889277e842663629aa7f9fd1795bcc82201b4b39:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/shadow-utils
 * [new ref]         889277e842663629aa7f9fd1795bcc82201b4b39 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 889277e Rebase to version 4.17.4