integration: add cluster setup and configuration and a few tests

integration/internal/cluster/cmd.go

@@ -0,0 +1,70 @@
+package cluster
+
+import (
+	"bufio"
+	"context"
+	"fmt"
+	"io"
+	"os/exec"
+
+	"github.com/rs/zerolog/log"
+)
+
+type cmdOption func(*exec.Cmd)
+
+func withArgs(args ...string) cmdOption {
+	return func(cmd *exec.Cmd) {
+		cmd.Args = append([]string{"kubectl"}, args...)
+	}
+}
+
+func withStdin(rdr io.Reader) cmdOption {
+	return func(cmd *exec.Cmd) {
+		cmd.Stdin = rdr
+	}
+}
+
+func withStdout(w io.Writer) cmdOption {
+	return func(cmd *exec.Cmd) {
+		cmd.Stdout = w
+	}
+}
+
+func withWorkingDir(wd string) cmdOption {
+	return func(cmd *exec.Cmd) {
+		cmd.Dir = wd
+	}
+}
+
+func run(ctx context.Context, name string, options ...cmdOption) error {
+	cmd := commandContext(ctx, name)
+	for _, o := range options {
+		o(cmd)
+	}
+	if cmd.Stderr == nil {
+		stderr, err := cmd.StderrPipe()
+		if err != nil {
+			return fmt.Errorf("failed to create stderr pipe for %s: %w", name, err)
+		}
+		go cmdLogger(stderr)
+		defer stderr.Close()
+	}
+	if cmd.Stdout == nil {
+		stdout, err := cmd.StdoutPipe()
+		if err != nil {
+			return fmt.Errorf("failed to create stdout pipe for %s: %w", name, err)
+		}
+		go cmdLogger(stdout)
+		defer stdout.Close()
+	}
+
+	log.Debug().Strs("args", cmd.Args).Msgf("running %s", name)
+	return cmd.Run()
+}
+
+func cmdLogger(rdr io.Reader) {
+	s := bufio.NewScanner(rdr)
+	for s.Scan() {
+		log.Debug().Msg(s.Text())
+	}
+}