Refactor all mounters to use the mounter interface

pkg/s3/mounter_s3ql.go

@@ -0,0 +1,112 @@
+package s3
+
+import (
+	"bytes"
+	"fmt"
+	"io"
+	"net/url"
+	"os"
+	"os/exec"
+	"path"
+	"strings"
+
+	"gopkg.in/ini.v1"
+)
+
+// Implements Mounter
+type s3qlMounter struct {
+	url        string
+	bucketURL  string
+	login      string
+	password   string
+	passphrase string
+	options    []string
+	ssl        bool
+	targetPath string
+}
+
+const (
+	s3qlCmdMkfs  = "mkfs.s3ql"
+	s3qlCmdMount = "mount.s3ql"
+)
+
+func newS3qlMounter(bucket string, cfg *Config) (Mounter, error) {
+	url, err := url.Parse(cfg.Endpoint)
+	if err != nil {
+		return nil, err
+	}
+	ssl := url.Scheme != "http"
+	if strings.Contains(url.Scheme, "http") {
+		url.Scheme = "s3c"
+	}
+	s3ql := &s3qlMounter{
+		url:        url.String(),
+		login:      cfg.AccessKeyID,
+		password:   cfg.SecretAccessKey,
+		passphrase: cfg.EncryptionKey,
+		ssl:        ssl,
+	}
+
+	url.Path = path.Join(url.Path, bucket)
+	s3ql.bucketURL = url.String()
+
+	if !ssl {
+		s3ql.options = []string{"--backend-options", "no-ssl"}
+	}
+
+	return s3ql, s3ql.writeConfig()
+}
+
+func (s3ql *s3qlMounter) Format() error {
+	// force creation to ignore existing data
+	args := []string{
+		s3ql.bucketURL,
+		"--force",
+	}
+
+	p := fmt.Sprintf("%s\n%s\n", s3ql.passphrase, s3ql.passphrase)
+	reader := bytes.NewReader([]byte(p))
+	return s3qlCmd(s3qlCmdMkfs, append(args, s3ql.options...), reader)
+}
+
+func (s3ql *s3qlMounter) Mount(targetPath string) error {
+	args := []string{
+		s3ql.bucketURL,
+		targetPath,
+		"--allow-other",
+	}
+	return s3qlCmd(s3qlCmdMount, append(args, s3ql.options...), nil)
+}
+
+func s3qlCmd(s3qlCmd string, args []string, stdin io.Reader) error {
+	cmd := exec.Command(s3qlCmd, args...)
+	if stdin != nil {
+		cmd.Stdin = stdin
+	}
+
+	out, err := cmd.CombinedOutput()
+	if err != nil {
+		return fmt.Errorf("Error running s3ql command: %s", out)
+	}
+	return nil
+}
+
+func (s3ql *s3qlMounter) writeConfig() error {
+	s3qlIni := ini.Empty()
+	section, err := s3qlIni.NewSection("s3ql")
+	if err != nil {
+		return err
+	}
+
+	section.NewKey("storage-url", s3ql.url)
+	section.NewKey("backend-login", s3ql.login)
+	section.NewKey("backend-password", s3ql.password)
+	section.NewKey("fs-passphrase", s3ql.passphrase)
+
+	authDir := os.Getenv("HOME") + "/.s3ql"
+	authFile := authDir + "/authinfo2"
+	os.Mkdir(authDir, 0700)
+	s3qlIni.SaveTo(authFile)
+	os.Chmod(authFile, 0600)
+	return nil
+}