$ git clone -n https://src.fedoraproject.org/rpms/nbdkit.git /var/lib/mock/f40-build-757417-119363/root/chroot_tmpdir/scmroot/nbdkit
Cloning into '/var/lib/mock/f40-build-757417-119363/root/chroot_tmpdir/scmroot/nbdkit'...
$ git fetch origin 6debad82d3b543e9b44d2d06fd84f98687faa521:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/nbdkit
 * [new ref]         6debad82d3b543e9b44d2d06fd84f98687faa521 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 6debad8 Add upstream fix for GCC 14