$ git clone -n https://src.fedoraproject.org/rpms/nbdkit.git /var/lib/mock/f40-build-2700097-70211/root/chroot_tmpdir/scmroot/nbdkit
Cloning into '/var/lib/mock/f40-build-2700097-70211/root/chroot_tmpdir/scmroot/nbdkit'...
$ git fetch origin 9514b10d2c0bb5d7886dac99c2a4e1f974b62c85:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/nbdkit
 * [new ref]         9514b10d2c0bb5d7886dac99c2a4e1f974b62c85 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 9514b10 New stable branch version 1.38.0