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// Command skiff is the entire control plane: one binary, invoked either by
// a repo's post-receive hook (deploy) or by hand (new-app, rollback).
package main
import (
"context"
"flag"
"fmt"
"os"
"path/filepath"
"strings"
"skiff/internal/appmeta"
"skiff/internal/deploy"
"skiff/internal/jailmgr"
"skiff/internal/layout"
"skiff/internal/sh"
"skiff/internal/tmpl"
"skiff/internal/zfsutil"
)
func main() {
if len(os.Args) < 2 {
fmt.Fprintln(os.Stderr, "usage: skiff <deploy|new-app|rollback> [flags]")
os.Exit(1)
}
var err error
switch os.Args[1] {
case "deploy":
err = cmdDeploy(os.Args[2:])
case "new-app":
err = cmdNewApp(os.Args[2:])
case "rollback":
err = cmdRollback(os.Args[2:])
default:
fmt.Fprintf(os.Stderr, "unknown subcommand %q\n", os.Args[1])
os.Exit(1)
}
if err != nil {
fmt.Fprintf(os.Stderr, "error: %v\n", err)
os.Exit(1)
}
}
func cmdDeploy(args []string) error {
fs := flag.NewFlagSet("deploy", flag.ExitOnError)
app := fs.String("app", "", "app name")
oldSHA := fs.String("old", "", "old commit sha (unused, kept for hook parity)")
newSHA := fs.String("new", "", "new commit sha to deploy")
ref := fs.String("ref", "", "ref being pushed, e.g. refs/heads/main")
fs.Parse(args)
_ = oldSHA
if *app == "" || *newSHA == "" {
return fmt.Errorf("--app and --new are required")
}
if *ref != "" && *ref != "refs/heads/main" {
fmt.Printf("==> %s is not refs/heads/main, skipping deploy\n", *ref)
return nil
}
return deploy.Run(context.Background(), os.Stdout, layout.Default(), *app, *newSHA)
}
func cmdNewApp(args []string) error {
fs := flag.NewFlagSet("new-app", flag.ExitOnError)
name := fs.String("name", "", "app name")
ip := fs.String("ip", "", "IPv4 address to assign the jail (operator-chosen)")
port := fs.Int("port", layout.DefaultHealthPort, "port the app listens on inside the jail")
healthPath := fs.String("health-path", layout.DefaultHealthPath, "health check path")
serverName := fs.String("server-name", "", "nginx server_name (defaults to <name>)")
baseSnapshot := fs.String("base-snapshot", "ready", "snapshot on the base dataset to clone from")
fs.Parse(args)
if *name == "" || *ip == "" {
return fmt.Errorf("--name and --ip are required")
}
if *serverName == "" {
*serverName = *name
}
ctx := context.Background()
out := os.Stdout
cfg := layout.Default()
fmt.Fprintf(out, "==> cloning %s@%s -> %s\n", cfg.BaseDataset, *baseSnapshot, cfg.AppDataset(*name))
if err := zfsutil.Clone(ctx, out, cfg.BaseDataset, *baseSnapshot, cfg.AppDataset(*name), cfg.JailRoot(*name)); err != nil {
return fmt.Errorf("clone base dataset: %w", err)
}
if err := os.MkdirAll(filepath.Join(cfg.AppDir(*name), "releases"), 0755); err != nil {
return fmt.Errorf("create app dir: %w", err)
}
if err := jailmgr.WriteConf(cfg, *name, *ip); err != nil {
return fmt.Errorf("write jail config: %w", err)
}
if err := appmeta.Write(cfg.MetaPath(*name), appmeta.Meta{
IP: *ip,
Port: *port,
HealthPath: *healthPath,
ServerName: *serverName,
}); err != nil {
return fmt.Errorf("write app metadata: %w", err)
}
fmt.Fprintf(out, "==> initializing bare repo %s\n", cfg.RepoPath(*name))
if err := sh.Run(ctx, out, "", "git", "init", "--bare", cfg.RepoPath(*name)); err != nil {
return fmt.Errorf("git init: %w", err)
}
hook, err := tmpl.PostReceive(tmpl.PostReceiveData{Name: *name})
if err != nil {
return err
}
hookPath := filepath.Join(cfg.RepoPath(*name), "hooks", "post-receive")
if err := os.WriteFile(hookPath, []byte(hook), 0755); err != nil {
return fmt.Errorf("install post-receive hook: %w", err)
}
fmt.Fprintln(out, "==> starting jail")
if err := jailmgr.Start(ctx, out, *name); err != nil {
return fmt.Errorf("start jail: %w", err)
}
fmt.Fprintf(out, "\n%s is ready. From the app's repo:\n git remote add skiff <this-host>:%s\n git push skiff main\n", *name, cfg.RepoPath(*name))
return nil
}
func cmdRollback(args []string) error {
fs := flag.NewFlagSet("rollback", flag.ExitOnError)
app := fs.String("app", "", "app name")
to := fs.String("to", "", "snapshot tag to roll back to, e.g. pre-<sha>")
list := fs.Bool("list", false, "list available snapshots and exit")
fs.Parse(args)
if *app == "" {
return fmt.Errorf("--app is required")
}
ctx := context.Background()
cfg := layout.Default()
dataset := cfg.AppDataset(*app)
if *list {
snaps, err := zfsutil.Snapshots(ctx, dataset)
if err != nil {
return err
}
fmt.Println(strings.Join(snaps, "\n"))
return nil
}
if *to == "" {
return fmt.Errorf("--to is required (use --list to see snapshots)")
}
if err := zfsutil.Rollback(ctx, os.Stdout, dataset, *to); err != nil {
return fmt.Errorf("rollback: %w", err)
}
return jailmgr.Restart(ctx, os.Stdout, *app)
}
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