Refactor all mounters to use the mounter interface

pkg/s3/mounter_s3fs.go

@@ -0,0 +1,64 @@
+package s3
+
+import (
+	"fmt"
+	"os"
+	"os/exec"
+)
+
+// Implements Mounter
+type s3fsMounter struct {
+	bucket        string
+	url           string
+	region        string
+	pwFileContent string
+}
+
+func newS3fsMounter(bucket string, cfg *Config) (Mounter, error) {
+	return &s3fsMounter{
+		bucket:        bucket,
+		url:           cfg.Endpoint,
+		region:        cfg.Region,
+		pwFileContent: cfg.AccessKeyID + ":" + cfg.SecretAccessKey,
+	}, nil
+}
+
+func (s3fs *s3fsMounter) Format() error {
+	return nil
+}
+
+func (s3fs *s3fsMounter) Mount(targetPath string) error {
+	if err := writes3fsPass(s3fs.pwFileContent); err != nil {
+		return err
+	}
+	args := []string{
+		fmt.Sprintf("%s", s3fs.bucket),
+		fmt.Sprintf("%s", targetPath),
+		"-o", "sigv2",
+		"-o", "use_path_request_style",
+		"-o", fmt.Sprintf("url=%s", s3fs.url),
+		"-o", fmt.Sprintf("endpoint=%s", s3fs.region),
+		"-o", "allow_other",
+		"-o", "mp_umask=000",
+	}
+	cmd := exec.Command("s3fs", args...)
+	out, err := cmd.CombinedOutput()
+	if err != nil {
+		return fmt.Errorf("Error mounting using s3fs, output: %s", out)
+	}
+	return nil
+}
+
+func writes3fsPass(pwFileContent string) error {
+	pwFileName := fmt.Sprintf("%s/.passwd-s3fs", os.Getenv("HOME"))
+	pwFile, err := os.OpenFile(pwFileName, os.O_RDWR|os.O_CREATE, 0600)
+	if err != nil {
+		return err
+	}
+	_, err = pwFile.WriteString(pwFileContent)
+	if err != nil {
+		return err
+	}
+	pwFile.Close()
+	return nil
+}