Add the documented -info flag and improve related docs

README.md

@@ -41,7 +41,7 @@ To start your first cluster, run `hepto` in `full` mode, which embeds both a
 master (apiserver, controller manager, etc.) and a kubelet in a single process.
 
 ```
-source env
+source docs/example.env
 hepto \
  # The node name, data will be stored in /var/lib/mycluster/mymaster
  -name myfull \
@@ -77,14 +77,14 @@ required when bootstraping nodes).
 Start by running a master node anywhere:
 
 ```
-source ./env
+source docs/example.env
 hepto -name mymaster -role master -iface eth0 -ip 2a00::dead:beef/64  
 ```
 
 Then on every other node, use the anchor IP address for discovery:
 
 ```
-source ./env
+source docs/example.env
 hepto -name mynode1 -role node -iface eth0 -anchor 2a00::dead:beef
 ```
 
@@ -103,8 +103,8 @@ In order to display hepto network configuration, which is useful for later setti
 the CNI and service proxy:
 
 ```
-source env
-hepto -name whatever -info
+source docs/example.env
+hepto -iface eth0 -name whatever -info
 ```
 
 ### Deploying Calico
@@ -229,7 +229,7 @@ Start by cloning the repository, then build the project:
 
 ```
 # Some build configuration is declared as environmemt variables
-source env
+source docs/example.env
 # Build a single binary
 go build -tags "$TAGS" -ldflags "$LDFLAGS" ./cmd/hepto.go
 ```

cmd/hepto/config.go

@@ -16,6 +16,8 @@ import (
 
 // General configuration, used for parsing flags
 type Config struct {
+	// Should we display info and exit
+	Info bool
 	// Should we fork and daemonize
 	Daemonize bool
 	// Data is stored under this base folder, a subfolder
@@ -46,6 +48,7 @@ func (c *Config) FlagSet() *flag.FlagSet {
 	// General config
 	fs.IntVar(&config.LogLevel, "verbose", 0, "Make logs more verbose")
 	fs.BoolVar(&config.Daemonize, "daemonize", false, "Daemonize the subprocess")
+	fs.BoolVar(&config.Info, "info", false, "Display cluster info and exit")
 	fs.BoolVar(&config.Pprof, "pprof", false, "Enable Golang profiling")
 	fs.StringVar(&config.DataDir, "data", "/var/lib", "Data base directory")
 	// Cluster settings

cmd/hepto/hepto.go

@@ -7,6 +7,7 @@ import (
 	"os"
 	"path"
 	"strings"
+	"text/tabwriter"
 
 	"go.acides.org/dolly"
 	"go.acides.org/hepto/services"
@@ -35,7 +36,21 @@ func Hepto() error {
 	config.Cluster.DataDir = "/data"
 	config.Iface.ReadinessProbe = netip.AddrPortFrom(config.Network.DNS[0], 53)
 	manager := services.NewManager(&config.Cluster, &config.Node, config.Logger)
-	// Create a container and start the manager
+	// If displaying info was required, go for it
+	if config.Info {
+		w := tabwriter.NewWriter(os.Stdout, 2, 3, 1, ' ', 0)
+		fmt.Fprintf(w, "cluster name\t%s\n", config.Cluster.Name)
+		fmt.Fprintf(w, "cluster vpn CIDR\t%s\n", manager.State.Networking().NodeNet)
+		fmt.Fprintf(w, "cluster pod CIDR\t%s\n", manager.State.Networking().PodNet)
+		fmt.Fprintf(w, "cluster service CIDR\t%s\n", manager.State.Networking().ServiceNet)
+		fmt.Fprintf(w, "node name\t%s\n", config.Node.Name)
+		fmt.Fprintf(w, "node role\t%s\n", config.Node.Role)
+		fmt.Fprintf(w, "node vpn IP\t%s\n", manager.State.Networking().NodeAddress)
+		fmt.Fprintf(w, "node data\t%s\n", dataPath)
+		fmt.Fprintf(w, "apiserver IP\t%s\n", manager.State.Networking().APIAddress)
+		return w.Flush()
+	}
+	// Otherwise create a container and start the manager
 	c := dolly.NewForking(!config.Daemonize)
 	c.AddAll(
 		dolly.NewContainer(config.Node.Name),