mirror of
https://github.com/facebook/sapling.git
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a6ae3edab9
Summary: This change makes it so that all of the C++ code related to the edenfs daemon is now contained in the eden/fs subdirectory. Reviewed By: bolinfest, wez Differential Revision: D4889053 fbshipit-source-id: d0bd4774cc0bdb5d1d6b6f47d716ecae52391f37
188 lines
5.1 KiB
C++
188 lines
5.1 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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#include "PathFuncs.h"
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#include <folly/Exception.h>
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#include <folly/Optional.h>
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#include <folly/portability/Stdlib.h>
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#include <unistd.h>
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using folly::StringPiece;
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namespace facebook {
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namespace eden {
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StringPiece dirname(StringPiece path) {
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auto slash = path.rfind('/');
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if (slash != std::string::npos) {
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return path.subpiece(0, slash);
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}
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return "";
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}
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StringPiece basename(StringPiece path) {
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auto slash = path.rfind('/');
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if (slash != std::string::npos) {
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path.advance(slash + 1);
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return path;
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}
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return path;
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}
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AbsolutePath getcwd() {
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char cwd[PATH_MAX];
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if (!::getcwd(cwd, sizeof(cwd))) {
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folly::throwSystemError("getcwd() failed");
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}
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return AbsolutePath{cwd};
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}
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namespace {
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struct CanonicalData {
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std::vector<StringPiece> components;
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bool isAbsolute{false};
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};
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CanonicalData canonicalPathData(StringPiece path) {
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CanonicalData data;
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const char* componentStart = path.begin();
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auto processSlash = [&](const char* end) {
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auto component = StringPiece{componentStart, end};
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componentStart = end + 1;
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if (component.empty()) {
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// Ignore empty components (doubled slash characters)
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// An empty component at the start of the string indicates an
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// absolute path.
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//
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// (POSIX specifies that "//" at the start of a path is special, and has
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// platform-specific behavior. We intentionally ignore that, and treat a
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// leading "//" the same as a single leading "/".)
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if (component.begin() == path.begin()) {
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data.isAbsolute = true;
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}
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} else if (component == ".") {
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// ignore this component
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} else if (component == "..") {
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if (data.components.empty()) {
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if (!data.isAbsolute) {
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// We have no choice but to add ".." to the start
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data.components.push_back(component);
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}
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} else if (data.components.back() != "..") {
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data.components.pop_back();
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}
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} else {
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data.components.push_back(component);
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}
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};
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for (const char* p = path.begin(); p != path.end(); ++p) {
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if (*p == kDirSeparator) {
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processSlash(p);
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}
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}
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if (componentStart != path.end()) {
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processSlash(path.end());
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}
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return data;
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}
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AbsolutePath canonicalPathImpl(
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StringPiece path,
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folly::Optional<AbsolutePathPiece> base) {
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auto makeAbsolutePath = [](const std::vector<StringPiece>& parts) {
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if (parts.empty()) {
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return AbsolutePath{};
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}
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size_t length = 1;
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for (const auto& part : parts) {
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length += part.size();
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}
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folly::fbstring value;
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value.reserve(length);
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for (const auto& part : parts) {
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value.push_back('/');
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value.append(part.begin(), part.end());
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}
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return AbsolutePath{std::move(value)};
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};
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auto canon = canonicalPathData(path);
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if (canon.isAbsolute) {
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return makeAbsolutePath(canon.components);
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}
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// Get the components from the base path
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// For simplicity we are just re-using canonicalPathData() even though the
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// base path is guaranteed to already be in canonical form.
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CanonicalData baseCanon;
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AbsolutePath cwd;
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if (!base.hasValue()) {
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// canonicalPathData() returns StringPieces pointing to the input,
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// so we have to store the cwd in a variable that will persist until the
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// end of this function.
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cwd = getcwd();
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baseCanon = canonicalPathData(cwd.stringPiece());
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} else {
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baseCanon = canonicalPathData(base.value().stringPiece());
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}
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for (auto it = canon.components.begin(); it != canon.components.end(); ++it) {
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// There may be leading ".." parts, so we have to deal with them here
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if (*it == "..") {
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if (!baseCanon.components.empty()) {
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baseCanon.components.pop_back();
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}
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} else {
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// Once we found a non-".." component, none of the rest can be "..",
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// so add everything else and break out of the loop
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baseCanon.components.insert(
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baseCanon.components.end(), it, canon.components.end());
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break;
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}
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}
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return makeAbsolutePath(baseCanon.components);
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}
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}
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AbsolutePath canonicalPath(folly::StringPiece path) {
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// Pass in folly::none.
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// canonicalPathImpl() will only call getcwd() if it is actually necessary.
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return canonicalPathImpl(path, folly::none);
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}
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AbsolutePath canonicalPath(folly::StringPiece path, AbsolutePathPiece base) {
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return canonicalPathImpl(path, folly::Optional<AbsolutePathPiece>{base});
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}
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AbsolutePath realpath(const char* path) {
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auto pathBuffer = ::realpath(path, nullptr);
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if (!pathBuffer) {
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folly::throwSystemError("realpath(", path, ") failed");
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}
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SCOPE_EXIT {
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free(pathBuffer);
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};
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return AbsolutePath(pathBuffer);
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}
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AbsolutePath realpath(StringPiece path) {
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// The input may not be nul-terminated, so we have to construct a std::string
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return realpath(path.str().c_str());
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}
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}
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}
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