installer: clean up codebase

* introduce helper soft package to work with SoftServe
* move commands to cmd/
diff --git a/core/installer/soft/client.go b/core/installer/soft/client.go
new file mode 100644
index 0000000..582b216
--- /dev/null
+++ b/core/installer/soft/client.go
@@ -0,0 +1,249 @@
+package soft
+
+import (
+	"fmt"
+	"io/ioutil"
+	"log"
+	"net"
+	"os"
+	"time"
+
+	"github.com/go-git/go-billy/v5/memfs"
+	"github.com/go-git/go-git/v5"
+	"github.com/go-git/go-git/v5/config"
+	"github.com/go-git/go-git/v5/plumbing"
+	"github.com/go-git/go-git/v5/plumbing/object"
+	gitssh "github.com/go-git/go-git/v5/plumbing/transport/ssh"
+	"github.com/go-git/go-git/v5/storage/memory"
+	"golang.org/x/crypto/ssh"
+	"sigs.k8s.io/yaml"
+)
+
+type Client struct {
+	ip     string
+	port   int
+	signer ssh.Signer
+	log    *log.Logger
+}
+
+func NewClient(ip string, port int, clientPrivateKey []byte, log *log.Logger) (*Client, error) {
+	signer, err := ssh.ParsePrivateKey(clientPrivateKey)
+	if err != nil {
+		return nil, err
+	}
+	log.SetPrefix("SOFT-SERVE")
+	return &Client{
+		ip,
+		port,
+		signer,
+		log,
+	}, nil
+}
+
+func (ss *Client) UpdateConfig(config Config, reason string) error {
+	log.Print("Updating configuration")
+	configBytes, err := yaml.Marshal(config)
+	if err != nil {
+		return err
+	}
+	repo, err := ss.cloneRepository("config")
+	if err != nil {
+		return err
+	}
+	wt, err := repo.Worktree()
+	if err != nil {
+		return err
+	}
+	if err := ss.writeFile(wt, "config.yaml", string(configBytes)); err != nil {
+		return err
+	}
+	if err := ss.commit(wt, reason); err != nil {
+		return nil
+	}
+	return ss.push(repo)
+}
+
+func (ss *Client) ReloadConfig() error {
+	log.Print("Reloading configuration")
+	client, err := ssh.Dial("tcp", ss.addressSSH(), ss.sshClientConfig())
+	if err != nil {
+		return err
+	}
+	session, err := client.NewSession()
+	if err != nil {
+		return err
+	}
+	defer session.Close()
+	return session.Run("reload")
+}
+
+func (ss *Client) AddRepository(name, readme string) error {
+	log.Printf("Adding repository %s", name)
+	repo, err := git.Init(memory.NewStorage(), memfs.New())
+	if err != nil {
+		return err
+	}
+	wt, err := repo.Worktree()
+	if err != nil {
+		return err
+	}
+	if err := ss.writeFile(wt, "README.md", readme); err != nil {
+		return err
+	}
+	if err := ss.commit(wt, "init"); err != nil {
+		return err
+	}
+	if _, err := repo.CreateRemote(&config.RemoteConfig{
+		Name: "soft",
+		URLs: []string{ss.repoPathByName(name)},
+	}); err != nil {
+		return err
+	}
+	return ss.push(repo)
+}
+
+func (ss *Client) CreateRepository(name string) error {
+	log.Printf("Creating repository %s", name)
+	configRepo, err := ss.getConfigRepo()
+	if err != nil {
+		return err
+	}
+	wt, err := configRepo.Worktree()
+	if err != nil {
+		return err
+	}
+	fmt.Println("aaaa")
+	b, _ := configRepo.Branches()
+	b.ForEach(func(r *plumbing.Reference) error {
+		fmt.Println(r.Name())
+		return nil
+	})
+	if err = wt.Checkout(&git.CheckoutOptions{
+		Branch: "refs/heads/master",
+	}); err != nil {
+		return err
+	}
+	fmt.Println("bbb")
+	f, err := wt.Filesystem.Open("config.yaml")
+	if err != nil {
+		return err
+	}
+	defer f.Close()
+	configBytes, err := ioutil.ReadAll(f)
+	if err != nil {
+		return err
+	}
+	config := make(map[string]interface{})
+	if err := yaml.Unmarshal(configBytes, &config); err != nil {
+		return err
+	}
+	repos := config["repos"].([]interface{})
+	repos = append(repos, map[string]interface{}{
+		"name":    name,
+		"repo":    name,
+		"private": true,
+		"note":    fmt.Sprintf("PCloud env for %s", name),
+	})
+	config["repos"] = repos
+	configBytes, err = yaml.Marshal(config)
+	if err != nil {
+		return err
+	}
+	if err := ss.writeFile(wt, "config.yaml", string(configBytes)); err != nil {
+		return err
+	}
+	if err := ss.commit(wt, fmt.Sprintf("add-repo: %s", name)); err != nil {
+		return err
+	}
+	return ss.push(configRepo)
+}
+
+func (ss *Client) getConfigRepo() (*git.Repository, error) {
+	return git.Clone(memory.NewStorage(), memfs.New(), &git.CloneOptions{
+		URL:             ss.addressGit(),
+		Auth:            ss.authGit(),
+		RemoteName:      "soft",
+		ReferenceName:   "refs/heads/master",
+		Depth:           1,
+		InsecureSkipTLS: true,
+		Progress:        os.Stdout,
+	})
+}
+
+func (ss *Client) repoPathByName(name string) string {
+	return fmt.Sprintf("%s/%s", ss.addressGit(), name)
+}
+
+func (ss *Client) commit(wt *git.Worktree, message string) error {
+	_, err := wt.Commit(message, &git.CommitOptions{
+		Author: &object.Signature{
+			Name:  "pcloud",
+			Email: "pcloud@installer",
+			When:  time.Now(),
+		},
+	})
+	return err
+}
+
+func (ss *Client) push(repo *git.Repository) error {
+	return repo.Push(&git.PushOptions{
+		RemoteName: "soft",
+		Auth:       ss.authGit(),
+	})
+}
+
+func (ss *Client) writeFile(wt *git.Worktree, path, contents string) error {
+	f, err := wt.Filesystem.Create(path)
+	if err != nil {
+		return err
+	}
+	defer f.Close()
+	if _, err = f.Write([]byte(contents)); err != nil {
+		return err
+	}
+	_, err = wt.Add(path)
+	return err
+}
+
+func (ss *Client) cloneRepository(name string) (*git.Repository, error) {
+	return git.Clone(memory.NewStorage(), memfs.New(), &git.CloneOptions{
+		URL:             ss.repoPathByName(name),
+		Auth:            ss.authGit(),
+		RemoteName:      "soft",
+		InsecureSkipTLS: true,
+	})
+}
+
+func (ss *Client) authGit() *gitssh.PublicKeys {
+	return &gitssh.PublicKeys{
+		Signer: ss.signer,
+		HostKeyCallbackHelper: gitssh.HostKeyCallbackHelper{
+			HostKeyCallback: func(hostname string, remote net.Addr, key ssh.PublicKey) error {
+				// TODO(giolekva): verify server public key
+				// fmt.Printf("## %s || %s -- \n", serverPubKey, ssh.MarshalAuthorizedKey(key))
+				return nil
+			},
+		},
+	}
+}
+
+func (ss *Client) sshClientConfig() *ssh.ClientConfig {
+	return &ssh.ClientConfig{
+		Auth: []ssh.AuthMethod{
+			ssh.PublicKeys(ss.signer),
+		},
+		HostKeyCallback: func(hostname string, remote net.Addr, key ssh.PublicKey) error {
+			// TODO(giolekva): verify server public key
+			// fmt.Printf("## %s || %s -- \n", serverPubKey, ssh.MarshalAuthorizedKey(key))
+			return nil
+		},
+	}
+}
+
+func (ss *Client) addressGit() string {
+	return fmt.Sprintf("ssh://%s:%d", ss.ip, ss.port)
+}
+
+func (ss *Client) addressSSH() string {
+	return fmt.Sprintf("%s:%d", ss.ip, ss.port)
+}