$ git clone -n https://src.fedoraproject.org/rpms/nbdkit.git /var/lib/mock/f38-build-719897-97316/root/chroot_tmpdir/scmroot/nbdkit
Cloning into '/var/lib/mock/f38-build-719897-97316/root/chroot_tmpdir/scmroot/nbdkit'...
$ git fetch origin 7665825cab2995ecd951b6e912ac9c83faa2e816:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/nbdkit
 * [new ref]         7665825cab2995ecd951b6e912ac9c83faa2e816 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 7665825 New upstream stable version 1.34.1