$ git clone -n https://src.fedoraproject.org/rpms/nbdkit.git /var/lib/mock/f40-build-2358114-60309/root/chroot_tmpdir/scmroot/nbdkit
Cloning into '/var/lib/mock/f40-build-2358114-60309/root/chroot_tmpdir/scmroot/nbdkit'...
$ git fetch origin 5f12965c1ff5ccbdcbeefd765e61cff3d80efb67:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/nbdkit
 * [new ref]         5f12965c1ff5ccbdcbeefd765e61cff3d80efb67 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 5f12965 New upstream development version 1.37.6