$ git clone -n https://src.fedoraproject.org/rpms/nss-altfiles.git /var/lib/mock/f40-build-803257-144212/root/chroot_tmpdir/scmroot/nss-altfiles
Cloning into '/var/lib/mock/f40-build-803257-144212/root/chroot_tmpdir/scmroot/nss-altfiles'...
$ git fetch origin ee9734a0681ffb33c1b4b72a3a9ff90285bc91ce:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/nss-altfiles
 * [new ref]         ee9734a0681ffb33c1b4b72a3a9ff90285bc91ce -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ee9734a Bump to 2.23.0-4