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https://github.com/ClickHouse/ClickHouse.git
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95 lines
2.9 KiB
C++
95 lines
2.9 KiB
C++
#include "filesystemHelpers.h"
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#include <sys/stat.h>
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#if defined(__linux__)
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# include <cstdio>
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# include <mntent.h>
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#endif
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#include <Poco/File.h>
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#include <Poco/Path.h>
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#include <Poco/Version.h>
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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 SYSTEM_ERROR;
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extern const int NOT_IMPLEMENTED;
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}
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bool enoughSpaceInDirectory(const std::string & path [[maybe_unused]], size_t data_size [[maybe_unused]])
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{
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#if POCO_VERSION >= 0x01090000
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auto free_space = Poco::File(path).freeSpace();
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return data_size <= free_space;
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#else
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return true;
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#endif
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}
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std::unique_ptr<TemporaryFile> createTemporaryFile(const std::string & path)
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{
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Poco::File(path).createDirectories();
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/// NOTE: std::make_shared cannot use protected constructors
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return std::make_unique<TemporaryFile>(path);
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}
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std::filesystem::path getMountPoint(std::filesystem::path absolute_path)
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{
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if (absolute_path.is_relative())
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throw Exception("Path is relative. It's a bug.", ErrorCodes::LOGICAL_ERROR);
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absolute_path = std::filesystem::canonical(absolute_path);
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const auto get_device_id = [](const std::filesystem::path & p)
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{
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struct stat st;
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if (stat(p.c_str(), &st))
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throwFromErrnoWithPath("Cannot stat " + p.string(), p.string(), ErrorCodes::SYSTEM_ERROR);
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return st.st_dev;
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};
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/// If /some/path/to/dir/ and /some/path/to/ have different device id,
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/// then device which contains /some/path/to/dir/filename is mounted to /some/path/to/dir/
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auto device_id = get_device_id(absolute_path);
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while (absolute_path.has_relative_path())
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{
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auto parent = absolute_path.parent_path();
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auto parent_device_id = get_device_id(parent);
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if (device_id != parent_device_id)
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return absolute_path;
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absolute_path = parent;
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device_id = parent_device_id;
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}
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return absolute_path;
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}
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/// Returns name of filesystem mounted to mount_point
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#if !defined(__linux__)
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[[noreturn]]
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#endif
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String getFilesystemName([[maybe_unused]] const String & mount_point)
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{
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#if defined(__linux__)
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auto mounted_filesystems = setmntent("/etc/mtab", "r");
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if (!mounted_filesystems)
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throw DB::Exception("Cannot open /etc/mtab to get name of filesystem", ErrorCodes::SYSTEM_ERROR);
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mntent fs_info;
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constexpr size_t buf_size = 4096; /// The same as buffer used for getmntent in glibc. It can happen that it's not enough
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char buf[buf_size];
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while (getmntent_r(mounted_filesystems, &fs_info, buf, buf_size) && fs_info.mnt_dir != mount_point)
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;
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endmntent(mounted_filesystems);
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if (fs_info.mnt_dir != mount_point)
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throw DB::Exception("Cannot find name of filesystem by mount point " + mount_point, ErrorCodes::SYSTEM_ERROR);
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return fs_info.mnt_fsname;
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#else
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throw DB::Exception("The function getFilesystemName is supported on Linux only", ErrorCodes::NOT_IMPLEMENTED);
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#endif
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}
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}
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