Dump: add output format tar and output to stdout (#10376)

* Dump: Use mholt/archive/v3 to support tar including many compressions

Signed-off-by: Philipp Homann <homann.philipp@googlemail.com>

* Dump: Allow dump output to stdout

Signed-off-by: Philipp Homann <homann.philipp@googlemail.com>

* Dump: Fixed bug present since #6677 where SessionConfig.Provider is never "file"

Signed-off-by: Philipp Homann <homann.philipp@googlemail.com>

* Dump: never pack RepoRootPath, LFS.ContentPath and LogRootPath when they are below AppDataPath

Signed-off-by: Philipp Homann <homann.philipp@googlemail.com>

* Dump: also dump LFS (fixes #10058)

Signed-off-by: Philipp Homann <homann.philipp@googlemail.com>

* Dump: never dump CustomPath if CustomPath is a subdir of or equal to AppDataPath (fixes #10365)

Signed-off-by: Philipp Homann <homann.philipp@googlemail.com>

* Use log.Info instead of fmt.Fprintf

Signed-off-by: Philipp Homann <homann.philipp@googlemail.com>

* import ordering

* make fmt

Co-authored-by: zeripath <art27@cantab.net>
Co-authored-by: techknowlogick <techknowlogick@gitea.io>
Co-authored-by: Matti R <matti@mdranta.net>

vendor/github.com/golang/gddo/httputil/transport.go

@@ -0,0 +1,87 @@
+// Copyright 2015 The Go Authors. All rights reserved.
+//
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file or at
+// https://developers.google.com/open-source/licenses/bsd.
+
+// This file implements a http.RoundTripper that authenticates
+// requests issued against api.github.com endpoint.
+
+package httputil
+
+import (
+	"net/http"
+	"net/url"
+)
+
+// AuthTransport is an implementation of http.RoundTripper that authenticates
+// with the GitHub API.
+//
+// When both a token and client credentials are set, the latter is preferred.
+type AuthTransport struct {
+	UserAgent          string
+	GithubToken        string
+	GithubClientID     string
+	GithubClientSecret string
+	Base               http.RoundTripper
+}
+
+// RoundTrip implements the http.RoundTripper interface.
+func (t *AuthTransport) RoundTrip(req *http.Request) (*http.Response, error) {
+	var reqCopy *http.Request
+	if t.UserAgent != "" {
+		reqCopy = copyRequest(req)
+		reqCopy.Header.Set("User-Agent", t.UserAgent)
+	}
+	if req.URL.Host == "api.github.com" && req.URL.Scheme == "https" {
+		switch {
+		case t.GithubClientID != "" && t.GithubClientSecret != "":
+			if reqCopy == nil {
+				reqCopy = copyRequest(req)
+			}
+			if reqCopy.URL.RawQuery == "" {
+				reqCopy.URL.RawQuery = "client_id=" + t.GithubClientID + "&client_secret=" + t.GithubClientSecret
+			} else {
+				reqCopy.URL.RawQuery += "&client_id=" + t.GithubClientID + "&client_secret=" + t.GithubClientSecret
+			}
+		case t.GithubToken != "":
+			if reqCopy == nil {
+				reqCopy = copyRequest(req)
+			}
+			reqCopy.Header.Set("Authorization", "token "+t.GithubToken)
+		}
+	}
+	if reqCopy != nil {
+		return t.base().RoundTrip(reqCopy)
+	}
+	return t.base().RoundTrip(req)
+}
+
+// CancelRequest cancels an in-flight request by closing its connection.
+func (t *AuthTransport) CancelRequest(req *http.Request) {
+	type canceler interface {
+		CancelRequest(req *http.Request)
+	}
+	if cr, ok := t.base().(canceler); ok {
+		cr.CancelRequest(req)
+	}
+}
+
+func (t *AuthTransport) base() http.RoundTripper {
+	if t.Base != nil {
+		return t.Base
+	}
+	return http.DefaultTransport
+}
+
+func copyRequest(req *http.Request) *http.Request {
+	req2 := new(http.Request)
+	*req2 = *req
+	req2.URL = new(url.URL)
+	*req2.URL = *req.URL
+	req2.Header = make(http.Header, len(req.Header))
+	for k, s := range req.Header {
+		req2.Header[k] = append([]string(nil), s...)
+	}
+	return req2
+}