diff --git a/internal/common/arch.go b/internal/common/arch.go
new file mode 100644
index 0000000..5d2dd90
--- /dev/null
+++ b/internal/common/arch.go
@@ -0,0 +1,24 @@
+// Copyright 2019 Sorint.lab
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package common
+
+type Arch string
+
+const (
+	Arch386   Arch = "386"
+	ArchAMD64 Arch = "amd64"
+	ArchARM   Arch = "arm"
+	ArchARM64 Arch = "arm64"
+)
diff --git a/internal/common/common.go b/internal/common/common.go
new file mode 100644
index 0000000..6ed5494
--- /dev/null
+++ b/internal/common/common.go
@@ -0,0 +1,127 @@
+// Copyright 2019 Sorint.lab
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package common
+
+import (
+	"io"
+	"io/ioutil"
+	"net/url"
+	"os"
+	"path"
+
+	"github.com/pkg/errors"
+	"github.com/sorintlab/agola/internal/etcd"
+	"github.com/sorintlab/agola/internal/objectstorage"
+	"github.com/sorintlab/agola/internal/services/config"
+	"go.uber.org/zap"
+)
+
+const (
+	StorePrefix = "agola"
+)
+
+// WriteFileAtomicFunc atomically writes a file, it achieves this by creating a
+// temporary file and then moving it. writeFunc is the func that will write
+// data to the file.
+// This function is taken from
+//   https://github.com/youtube/vitess/blob/master/go/ioutil2/ioutil.go
+// Copyright 2012, Google Inc. BSD-license, see licenses/LICENSE-BSD-3-Clause
+func WriteFileAtomicFunc(filename string, perm os.FileMode, writeFunc func(f io.Writer) error) error {
+	dir, name := path.Split(filename)
+	f, err := ioutil.TempFile(dir, name)
+	if err != nil {
+		return err
+	}
+	err = writeFunc(f)
+	if err == nil {
+		err = f.Sync()
+	}
+	if closeErr := f.Close(); err == nil {
+		err = closeErr
+	}
+	if permErr := os.Chmod(f.Name(), perm); err == nil {
+		err = permErr
+	}
+	if err == nil {
+		err = os.Rename(f.Name(), filename)
+	}
+	// Any err should result in full cleanup.
+	if err != nil {
+		os.Remove(f.Name())
+	}
+	return err
+}
+
+// WriteFileAtomic atomically writes a file
+func WriteFileAtomic(filename string, data []byte, perm os.FileMode) error {
+	return WriteFileAtomicFunc(filename, perm,
+		func(f io.Writer) error {
+			_, err := f.Write(data)
+			return err
+		})
+}
+
+func NewLTS(c *config.LTS) (*objectstorage.ObjStorage, error) {
+	var (
+		err error
+		lts objectstorage.Storage
+	)
+
+	switch c.Type {
+	case config.LTSTypePosix:
+		lts, err = objectstorage.NewPosixStorage(c.Path)
+		if err != nil {
+			return nil, errors.Wrapf(err, "failed to create posix object storage")
+		}
+	case config.LTSTypeS3:
+		// minio golang client doesn't accept an url as an endpoint
+		endpoint := c.Endpoint
+		secure := !c.DisableTLS
+		if u, err := url.Parse(c.Endpoint); err == nil {
+			endpoint = u.Host
+			switch u.Scheme {
+			case "https":
+				secure = true
+			case "http":
+				secure = false
+			default:
+				return nil, errors.Errorf("wrong s3 endpoint scheme %q (must be http or https)", u.Scheme)
+			}
+		}
+		lts, err = objectstorage.NewS3Storage(c.Bucket, c.Location, endpoint, c.AccessKey, c.SecretAccessKey, secure)
+		if err != nil {
+			return nil, errors.Wrapf(err, "failed to create s3 object storage")
+		}
+	}
+
+	return objectstorage.NewObjStorage(lts, "/"), nil
+}
+
+func NewEtcd(c *config.Etcd, logger *zap.Logger, prefix string) (*etcd.Store, error) {
+	e, err := etcd.New(etcd.Config{
+		Logger:        logger,
+		Endpoints:     c.Endpoints,
+		Prefix:        prefix,
+		CertFile:      c.TLSCertFile,
+		KeyFile:       c.TLSKeyFile,
+		CAFile:        c.TLSCAFile,
+		SkipTLSVerify: c.TLSSkipVerify,
+	})
+	if err != nil {
+		return nil, errors.Wrap(err, "failed to create etcd store")
+	}
+
+	return e, nil
+}