$ git clone -n https://src.fedoraproject.org/rpms/kanagram.git /var/lib/mock/f40-build-2535363-61850/root/chroot_tmpdir/scmroot/kanagram
Cloning into '/var/lib/mock/f40-build-2535363-61850/root/chroot_tmpdir/scmroot/kanagram'...
$ git fetch origin 7e57bafec09b79d90c227a375061d0d513cd7b74:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/kanagram
 * [new ref]         7e57bafec09b79d90c227a375061d0d513cd7b74 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 7e57baf Rebuild respun sources