blob: 416ea3dee0eb774886e6bd7632d5b1efcde8d6fe [file] [log] [blame]
// 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)