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31035a3cd1
Otherwise this will trigger logical error on CREATE TABLE with default config.d overrides (path=./).
122 lines
3.5 KiB
C++
122 lines
3.5 KiB
C++
#include <Common/renameat2.h>
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#include <Common/Exception.h>
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#include <Poco/File.h>
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#if defined(linux) || defined(__linux) || defined(__linux__)
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#include <unistd.h>
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#include <fcntl.h>
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#include <sys/syscall.h>
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#include <linux/fs.h>
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#include <sys/utsname.h>
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#endif
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namespace DB
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{
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namespace ErrorCodes
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{
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extern const int LOGICAL_ERROR;
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extern const int ATOMIC_RENAME_FAIL;
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extern const int SYSTEM_ERROR;
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extern const int UNSUPPORTED_METHOD;
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extern const int FILE_ALREADY_EXISTS;
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}
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static bool supportsRenameat2Impl()
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{
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#if defined(__NR_renameat2)
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/// renameat2 is available in linux since 3.15
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struct utsname sysinfo;
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if (uname(&sysinfo))
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return false;
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char * point = nullptr;
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auto v_major = strtol(sysinfo.release, &point, 10);
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errno = 0;
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if (errno || *point != '.' || v_major < 3)
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return false;
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if (3 < v_major)
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return true;
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errno = 0;
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auto v_minor = strtol(point + 1, nullptr, 10);
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return !errno && 15 <= v_minor;
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#else
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return false;
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#endif
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}
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#if defined(__NR_renameat2)
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static void renameat2(const std::string & old_path, const std::string & new_path, int flags)
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{
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if (old_path.empty() || new_path.empty())
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throw Exception("Cannot rename " + old_path + " to " + new_path + ": path is empty", ErrorCodes::LOGICAL_ERROR);
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/// int olddirfd (ignored for absolute oldpath), const char *oldpath,
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/// int newdirfd (ignored for absolute newpath), const char *newpath,
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/// unsigned int flags
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if (0 == syscall(__NR_renameat2, AT_FDCWD, old_path.c_str(), AT_FDCWD, new_path.c_str(), flags))
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return;
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if (errno == EEXIST)
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throwFromErrno("Cannot rename " + old_path + " to " + new_path + " because the second path already exists", ErrorCodes::ATOMIC_RENAME_FAIL);
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if (errno == ENOENT)
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throwFromErrno("Paths cannot be exchanged because " + old_path + " or " + new_path + " does not exist", ErrorCodes::ATOMIC_RENAME_FAIL);
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throwFromErrnoWithPath("Cannot rename " + old_path + " to " + new_path, new_path, ErrorCodes::SYSTEM_ERROR);
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}
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#else
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#define RENAME_NOREPLACE -1
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#define RENAME_EXCHANGE -1
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[[noreturn]]
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static void renameat2(const std::string &, const std::string &, int)
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{
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throw Exception("Compiled without renameat2() support", ErrorCodes::UNSUPPORTED_METHOD);
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}
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#endif
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static void renameNoReplaceFallback(const std::string & old_path, const std::string & new_path)
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{
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/// NOTE it's unsafe
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if (Poco::File{new_path}.exists())
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throw Exception("File " + new_path + " exists", ErrorCodes::FILE_ALREADY_EXISTS);
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Poco::File{old_path}.renameTo(new_path);
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}
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/// Do not use [[noreturn]] to avoid warnings like "code will never be executed" in other places
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#pragma GCC diagnostic push
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#pragma GCC diagnostic ignored "-Wmissing-noreturn"
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static void renameExchangeFallback(const std::string &, const std::string &)
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{
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throw Exception("System call renameat2() is not supported", ErrorCodes::UNSUPPORTED_METHOD);
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}
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#pragma GCC diagnostic pop
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bool supportsRenameat2()
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{
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static bool supports = supportsRenameat2Impl();
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return supports;
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}
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void renameNoReplace(const std::string & old_path, const std::string & new_path)
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{
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if (supportsRenameat2())
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renameat2(old_path, new_path, RENAME_NOREPLACE);
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else
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renameNoReplaceFallback(old_path, new_path);
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}
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void renameExchange(const std::string & old_path, const std::string & new_path)
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{
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if (supportsRenameat2())
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renameat2(old_path, new_path, RENAME_EXCHANGE);
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else
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renameExchangeFallback(old_path, new_path);
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}
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}
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