| // Copyright (c) 2017, the Dart project authors. Please see the AUTHORS file |
| // for details. All rights reserved. Use of this source code is governed by a |
| // BSD-style license that can be found in the LICENSE file. |
| |
| #include "platform/globals.h" |
| #if defined(HOST_OS_LINUX) |
| |
| #include "bin/namespace.h" |
| |
| #include <errno.h> |
| #include <fcntl.h> |
| |
| #include "bin/file.h" |
| #include "platform/signal_blocker.h" |
| #include "platform/text_buffer.h" |
| |
| namespace dart { |
| namespace bin { |
| |
| class NamespaceImpl { |
| public: |
| explicit NamespaceImpl(intptr_t rootfd) : rootfd_(rootfd), cwd_(strdup("/")) { |
| ASSERT(rootfd_ > 0); |
| cwdfd_ = dup(rootfd_); |
| ASSERT(cwdfd_ > 0); |
| } |
| |
| explicit NamespaceImpl(const char* path) |
| : rootfd_(TEMP_FAILURE_RETRY(open64(path, O_DIRECTORY))), |
| cwd_(strdup("/")) { |
| ASSERT(rootfd_ > 0); |
| cwdfd_ = dup(rootfd_); |
| ASSERT(cwdfd_ > 0); |
| } |
| |
| ~NamespaceImpl() { |
| NO_RETRY_EXPECTED(close(rootfd_)); |
| free(cwd_); |
| NO_RETRY_EXPECTED(close(cwdfd_)); |
| } |
| |
| intptr_t rootfd() const { return rootfd_; } |
| char* cwd() const { return cwd_; } |
| intptr_t cwdfd() const { return cwdfd_; } |
| |
| bool SetCwd(Namespace* namespc, const char* new_path) { |
| NamespaceScope ns(namespc, new_path); |
| const intptr_t new_cwdfd = |
| TEMP_FAILURE_RETRY(openat64(ns.fd(), ns.path(), O_DIRECTORY)); |
| if (new_cwdfd < 0) { |
| return false; |
| } |
| |
| TextBuffer tbuf(PATH_MAX); |
| if (!File::IsAbsolutePath(new_path)) { |
| tbuf.AddString(cwd_); |
| } |
| tbuf.AddString(File::PathSeparator()); |
| tbuf.AddString(ns.path()); |
| |
| // Normalize it. |
| char result[PATH_MAX]; |
| const intptr_t result_len = |
| File::CleanUnixPath(tbuf.buffer(), result, PATH_MAX); |
| if (result_len < 0) { |
| errno = ENAMETOOLONG; |
| return false; |
| } |
| |
| free(cwd_); |
| cwd_ = strdup(result); |
| close(cwdfd_); |
| cwdfd_ = new_cwdfd; |
| return true; |
| } |
| |
| private: |
| intptr_t rootfd_; // dirfd for the namespace root. |
| char* cwd_; // cwd relative to the namespace. |
| intptr_t cwdfd_; // dirfd for the cwd. |
| |
| DISALLOW_COPY_AND_ASSIGN(NamespaceImpl); |
| }; |
| |
| Namespace* Namespace::Create(intptr_t namespc) { |
| NamespaceImpl* namespc_impl = NULL; |
| if (namespc != kNone) { |
| namespc_impl = new NamespaceImpl(namespc); |
| } |
| return new Namespace(namespc_impl); |
| } |
| |
| Namespace* Namespace::Create(const char* path) { |
| return new Namespace(new NamespaceImpl(path)); |
| } |
| |
| Namespace::~Namespace() { |
| delete namespc_; |
| } |
| |
| intptr_t Namespace::Default() { |
| return kNone; |
| } |
| |
| const char* Namespace::GetCurrent(Namespace* namespc) { |
| if (Namespace::IsDefault(namespc)) { |
| char buffer[PATH_MAX]; |
| if (getcwd(buffer, PATH_MAX) == NULL) { |
| return NULL; |
| } |
| return DartUtils::ScopedCopyCString(buffer); |
| } |
| const char* cwd = namespc->namespc()->cwd(); |
| return cwd; |
| } |
| |
| bool Namespace::SetCurrent(Namespace* namespc, const char* path) { |
| if (Namespace::IsDefault(namespc)) { |
| return (NO_RETRY_EXPECTED(chdir(path)) == 0); |
| } |
| return namespc->namespc()->SetCwd(namespc, path); |
| } |
| |
| void Namespace::ResolvePath(Namespace* namespc, |
| const char* path, |
| intptr_t* dirfd, |
| const char** resolved_path) { |
| ASSERT(dirfd != NULL); |
| ASSERT(resolved_path != NULL); |
| if (Namespace::IsDefault(namespc)) { |
| *dirfd = AT_FDCWD; |
| *resolved_path = path; |
| return; |
| } |
| if (File::IsAbsolutePath(path)) { |
| *dirfd = namespc->namespc()->rootfd(); |
| if (strcmp(path, File::PathSeparator()) == 0) { |
| // Change "/" to ".". |
| *resolved_path = "."; |
| } else { |
| // Otherwise strip off the leading "/". |
| *resolved_path = &path[1]; |
| } |
| } else { |
| *dirfd = namespc->namespc()->cwdfd(); |
| *resolved_path = path; |
| } |
| } |
| |
| NamespaceScope::NamespaceScope(Namespace* namespc, const char* path) { |
| Namespace::ResolvePath(namespc, path, &fd_, &path_); |
| } |
| |
| NamespaceScope::~NamespaceScope() {} |
| |
| } // namespace bin |
| } // namespace dart |
| |
| #endif // defined(HOST_OS_LINUX) |