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https://github.com/facebook/sapling.git
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f5e924af94
Summary: This updates the ClientConfig and EdenMount code to support storing two parent commits. This changes the on-disk SNAPSHOT file contents add an 8-byte header that includes a file identifier and a file format version number, followed by up to two commit hashes. The code currently can read either the old or new format from the SNAPSHOT file. We should be able to drop the code for reading the old format fairly soon if we want, though. This diff only updates the ClientConfig and EdenMount code, and does not yet update the thrift APIs or the eden mercurial extension yet. I will update the rest of the code in a subsequent diff. Reviewed By: bolinfest, wez Differential Revision: D4943917 fbshipit-source-id: cf456e67b845aa0cf8b45c822985cb932df107b4
95 lines
2.0 KiB
C++
95 lines
2.0 KiB
C++
/*
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* Copyright (c) 2016-present, Facebook, Inc.
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* All rights reserved.
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*
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* This source code is licensed under the BSD-style license found in the
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* LICENSE file in the root directory of this source tree. An additional grant
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* of patent rights can be found in the PATENTS file in the same directory.
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*
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*/
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#pragma once
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#include <boost/operators.hpp>
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#include <folly/Range.h>
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#include <stdint.h>
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#include <array>
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#include <iosfwd>
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namespace folly {
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class IOBuf;
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}
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namespace facebook {
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namespace eden {
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/**
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* Immutable 160-bit hash.
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*/
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class Hash : boost::totally_ordered<Hash> {
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public:
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enum { RAW_SIZE = 20 };
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using Storage = std::array<uint8_t, RAW_SIZE>;
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/**
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* Create a 0-initialized hash
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*/
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Hash();
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explicit Hash(Storage bytes);
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explicit Hash(folly::ByteRange bytes);
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/**
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* @param hex is a string of 40 hexadecimal characters.
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*/
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explicit Hash(folly::StringPiece hex);
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/**
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* Compute the SHA1 hash of an IOBuf chain.
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*/
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static Hash sha1(const folly::IOBuf* buf);
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/**
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* Compute the SHA1 hash of a ByteRange
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*/
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static Hash sha1(folly::ByteRange data);
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folly::ByteRange getBytes() const;
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folly::MutableByteRange mutableBytes();
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/** @return 40-character [lowercase] hex representation of this hash. */
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std::string toString() const;
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std::size_t getHashCode() const;
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bool operator==(const Hash&) const;
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bool operator<(const Hash&) const;
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private:
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Storage bytes_;
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};
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/** A hash object initialized to all zeroes */
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extern const Hash kZeroHash;
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/**
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* Output stream operator for Hash.
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*
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* This makes it possible to easily use Hash in glog statements.
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*/
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std::ostream& operator<<(std::ostream& os, const Hash& hash);
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/* Define toAppend() so folly::to<string>(Hash) will work */
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void toAppend(const Hash& hash, std::string* result);
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}
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}
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namespace std {
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template <>
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struct hash<facebook::eden::Hash> {
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std::size_t operator()(const facebook::eden::Hash& hash) const {
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return hash.getHashCode();
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}
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};
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}
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