fix: copy in ssh host keys via virt-customize

flake.nix

@@ -89,6 +89,9 @@
  sha256 = "1lvhgla02g6f4ahzsczaq35ci76b54i4x5xmgywiramrqci19hxk";
  extraVirtCustomizeCommands = [
  "--copy-in ${./testing/ubuntu}/01-netplan.yaml:/etc/netplan/"
+ "--upload ${./testing}/id_ed25519:/etc/ssh/ssh_host_ed25519_key"
+ "--upload ${./testing}/id_ed25519.pub:/etc/ssh/ssh_host_ed25519_key.pub"
+ "--run-command 'chmod 400 /etc/ssh/ssh_host_ed25519_key'"
  ];
  excludeRuntimes = [ "proot" ];
  };
@@ -216,10 +219,12 @@
  #!/usr/bin/env bash
  set -e
 
+ export TMPDIR=$(${pkgs.coreutils}/bin/mktemp -d)
+ trap "${pkgs.coreutils}/bin/chmod -R +w '$TMPDIR'; ${pkgs.coreutils}/bin/rm -rf '$TMPDIR'" EXIT
+
  if [ -n "$RAND_PORT" ]; then
  # derive ssh port number from os name, to gain ability to run these jobs in parallel without collision
- osHash=$((0x"$(echo ${os} | sha256sum | cut -d " " -f 1)")) && [ "$r" -lt 0 ] && ((r *= -1))
- port=$(( ($osHash % 55535) + 10000 ))
+ port=$(( 1024 + (0x$(echo -n "your-string" | sha256sum | cut -c 1-8) % (65535 - 1024 + 1)) ))
  else
  port=10022
  fi
@@ -232,6 +237,9 @@
  sshRoot="${pkgs.openssh}/bin/ssh -p $port -i $privKey -o StrictHostKeyChecking=no root@localhost"
  scp="${pkgs.openssh}/bin/scp -P $port -i $privKey -o StrictHostKeyChecking=no"
 
+ cp "$privKey" $TMPDIR/privKey
+ chmod 400 $TMPDIR/privKey
+
  setup_and_start_vm() {
  cat $img > /tmp/${os}-img