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package main
import (
"fmt"
"os"
"os/exec"
"github.com/polydawn/meep"
"github.com/tazjin/kontemplate/context"
"github.com/tazjin/kontemplate/templater"
"github.com/urfave/cli"
)
type KubeCtlError struct {
meep.AllTraits
}
func main() {
app := cli.NewApp()
app.Name = "kontemplate"
app.Usage = "simple Kubernetes resource templating"
app.Version = "0.0.1"
app.Commands = []cli.Command{
templateCommand(),
applyCommand(),
}
app.Run(os.Args)
}
func templateCommand() cli.Command {
return cli.Command{
Name: "template",
Usage: "Interpolate and print templates",
Flags: commonFlags(),
Action: func(c *cli.Context) error {
resources, err := templateResources(c)
if err != nil {
return err
}
for _, r := range resources {
fmt.Println(r)
}
return nil
},
}
}
func applyCommand() cli.Command {
dryRun := false
return cli.Command{
Name: "apply",
Usage: "Interpolate templates and run 'kubectl apply'",
Flags: append(commonFlags(), cli.BoolFlag{
Name: "dry-run",
Usage: "Only print objects that would be sent, without sending them",
Destination: &dryRun,
}),
Action: func(c *cli.Context) error {
resources, err := templateResources(c)
if err != nil {
return err
}
var kubectl *exec.Cmd
if dryRun {
kubectl = exec.Command("kubectl", "apply", "-f", "-", "--dry-run")
} else {
kubectl = exec.Command("kubectl", "apply", "-f", "-")
}
stdin, err := kubectl.StdinPipe()
if err != nil {
return meep.New(&KubeCtlError{}, meep.Cause(err))
}
kubectl.Stdout = os.Stdout
kubectl.Stderr = os.Stderr
if err = kubectl.Start(); err != nil {
return meep.New(&KubeCtlError{}, meep.Cause(err))
}
for _, r := range resources {
fmt.Fprintln(stdin, r)
}
stdin.Close()
kubectl.Wait()
return nil
},
}
}
func commonFlags() []cli.Flag {
return []cli.Flag{
cli.StringFlag{
Name: "file, f",
Usage: "Cluster configuration file to use",
},
cli.StringSliceFlag{
Name: "limit, l",
Usage: "Limit templating to certain resource sets",
},
}
}
func templateResources(c *cli.Context) ([]string, error) {
limit := c.StringSlice("limit")
f := c.String("file")
if f == "" {
return nil, meep.New(
&meep.ErrInvalidParam{
Param: "file",
Reason: "Cluster config file must be specified",
},
)
}
ctx, err := context.LoadContextFromFile(f)
if err != nil {
return nil, err
}
return templater.LoadAndPrepareTemplates(&limit, ctx)
}
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