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116 lines
2.7 KiB
C++
116 lines
2.7 KiB
C++
/* Copyright (C) 2014 InfiniDB, Inc.
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License
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as published by the Free Software Foundation; version 2 of
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the License.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
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MA 02110-1301, USA. */
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#include <unistd.h>
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#include <string>
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//#define NDEBUG
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#include <cassert>
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#include <climits>
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using namespace std;
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#include <boost/tokenizer.hpp>
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#include <boost/filesystem.hpp>
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using namespace boost;
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namespace fs = boost::filesystem;
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#include "fsutils.h"
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#include "exceptclasses.h"
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namespace
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{
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const string resolveInDir(const string& dir, const string& name)
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{
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idbassert(!dir.empty() && !name.empty());
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string ret;
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fs::path path(dir);
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if (!fs::exists(path))
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return ret;
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idbassert(fs::exists(path));
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path /= name;
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if (!fs::exists(path))
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return ret;
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idbassert(fs::exists(path));
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if (!fs::is_symlink(path))
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return ret;
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idbassert(fs::is_symlink(path));
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char* realname = (char*)alloca(PATH_MAX + 1);
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ssize_t realnamelen = readlink(path.string().c_str(), realname, PATH_MAX);
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if (realnamelen <= 0)
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return ret;
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realname[realnamelen] = 0;
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fs::path linkname(realname);
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fs::path realpath("/dev");
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realpath /= linkname.filename();
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ret = realpath.string();
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return ret;
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}
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inline const string label2dev(const string& name)
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{
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return resolveInDir("/dev/disk/by-label", name);
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}
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inline const string uuid2dev(const string& name)
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{
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return resolveInDir("/dev/disk/by-uuid", name);
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}
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} // namespace
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namespace fsutils
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{
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const string symname2devname(const string& sympath)
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{
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string ret;
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typedef boost::tokenizer<boost::char_separator<char> > tokenizer;
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boost::char_separator<char> sep("=");
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tokenizer tokens(sympath, sep);
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tokenizer::iterator tok_iter = tokens.begin();
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idbassert(tok_iter != tokens.end());
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string symtype = *tok_iter;
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if (symtype != "LABEL" && symtype != "UUID")
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return ret;
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idbassert(symtype == "LABEL" || symtype == "UUID");
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++tok_iter;
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idbassert(tok_iter != tokens.end());
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string symname = *tok_iter;
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++tok_iter;
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idbassert(tok_iter == tokens.end());
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if (symtype == "LABEL")
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ret = label2dev(symname);
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else if (symtype == "UUID")
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ret = uuid2dev(symname);
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return ret;
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}
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} // namespace fsutils
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