preflight: check runtime specific binary

pkg/constants/dependencies.go

@@ -8,7 +8,6 @@ var BinaryDependencies = [...]string{
  "e2fsck",
  "resize2fs",
  "strings",
- "docker",
  "dmsetup",
  "ssh",
  "git",

pkg/preflight/checkers/checks.go

@@ -104,10 +104,18 @@ func StartCmdChecks(vm *api.VM, ignoredPreflightErrors sets.String) error {
  checks = append(checks, ExistingFileChecker{filePath: dependency})
  }
  }
+
  checks = append(checks, providers.Runtime.PreflightChecker())
  for _, port := range vm.Spec.Network.Ports {
  checks = append(checks, PortOpenChecker{port: port.HostPort})
  }
+
+ // Binary name of the runtime is just the runtime name in string, "docker" or "containerd"
+ // So it is OK for us to check only one of them, as people may installing only containerd but not docker
+ runtimeBinaryName := providers.RuntimeName.String()
+ checks = append(checks, BinInPathChecker{bin: runtimeBinaryName})
+
+ // Check common binaries
  for _, dependency := range constants.BinaryDependencies {
  checks = append(checks, BinInPathChecker{bin: dependency})
  }