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/dsnet/compress/api.go

@@ -0,0 +1,74 @@
+// Copyright 2015, Joe Tsai. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE.md file.
+
+// Package compress is a collection of compression libraries.
+package compress
+
+import (
+	"bufio"
+	"io"
+
+	"github.com/dsnet/compress/internal/errors"
+)
+
+// The Error interface identifies all compression related errors.
+type Error interface {
+	error
+	CompressError()
+
+	// IsDeprecated reports the use of a deprecated and unsupported feature.
+	IsDeprecated() bool
+
+	// IsCorrupted reports whether the input stream was corrupted.
+	IsCorrupted() bool
+}
+
+var _ Error = errors.Error{}
+
+// ByteReader is an interface accepted by all decompression Readers.
+// It guarantees that the decompressor never reads more data than is necessary
+// from the underlying io.Reader.
+type ByteReader interface {
+	io.Reader
+	io.ByteReader
+}
+
+var _ ByteReader = (*bufio.Reader)(nil)
+
+// BufferedReader is an interface accepted by all decompression Readers.
+// It guarantees that the decompressor never reads more data than is necessary
+// from the underlying io.Reader. Since BufferedReader allows a decompressor
+// to peek at bytes further along in the stream without advancing the read
+// pointer, decompression can experience a significant performance gain when
+// provided a reader that satisfies this interface. Thus, a decompressor will
+// prefer this interface over ByteReader for performance reasons.
+//
+// The bufio.Reader satisfies this interface.
+type BufferedReader interface {
+	io.Reader
+
+	// Buffered returns the number of bytes currently buffered.
+	//
+	// This value becomes invalid following the next Read/Discard operation.
+	Buffered() int
+
+	// Peek returns the next n bytes without advancing the reader.
+	//
+	// If Peek returns fewer than n bytes, it also returns an error explaining
+	// why the peek is short. Peek must support peeking of at least 8 bytes.
+	// If 0 <= n <= Buffered(), Peek is guaranteed to succeed without reading
+	// from the underlying io.Reader.
+	//
+	// This result becomes invalid following the next Read/Discard operation.
+	Peek(n int) ([]byte, error)
+
+	// Discard skips the next n bytes, returning the number of bytes discarded.
+	//
+	// If Discard skips fewer than n bytes, it also returns an error.
+	// If 0 <= n <= Buffered(), Discard is guaranteed to succeed without reading
+	// from the underlying io.Reader.
+	Discard(n int) (int, error)
+}
+
+var _ BufferedReader = (*bufio.Reader)(nil)