95 lines
2.6 KiB
C++
95 lines
2.6 KiB
C++
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/*
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Searchpath - helpers for searching directory lists and locating modules
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Copyright (C) Lumiera.org
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2011, Hermann Vosseler <Ichthyostega@web.de>
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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 as
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published by the Free Software Foundation; either version 2 of
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the License, or (at your option) any later version.
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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., 675 Mass Ave, Cambridge, MA 02139, USA.
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* *****************************************************/
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#include "lib/error.hpp"
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#include "lib/searchpath.hpp"
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#include "lib/symbol.hpp"
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namespace lib {
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LUMIERA_ERROR_DEFINE (FILE_NOT_DIRECTORY, "path element points at a file instead of a directory");
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namespace {
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Literal GET_PATH_TO_EXECUTABLE ("/proc/self/exe");
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}
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regex SearchPathSplitter::EXTRACT_PATHSPEC ("(\\$?ORIGIN/)?([^:]+)");
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/** @internal helper to figure out the installation directory,
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* as given by the absolute path of the currently executing program
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* @warning this is Linux specific code */
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string
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findExePath()
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{
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static string buff(lib::STRING_MAX_RELEVANT+1, '\0' );
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if (!buff[0])
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{
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ssize_t chars_read = readlink (GET_PATH_TO_EXECUTABLE, &buff[0], lib::STRING_MAX_RELEVANT);
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if (0 > chars_read || chars_read == ssize_t(lib::STRING_MAX_RELEVANT))
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throw error::Fatal ("unable to discover path of running executable");
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buff.resize(chars_read);
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}
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return buff;
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}
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string
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resolveModulePath (string moduleName, string searchPath)
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{
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fsys::path modulePathName (moduleName);
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SearchPathSplitter searchLocation(searchPath);
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while (true)
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{
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if (fsys::exists (modulePathName))
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{
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INFO (config, "found module %s", modulePathName.string().c_str());
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return modulePathName.string();
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}
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// try / continue search path
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if (searchLocation.isValid())
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modulePathName = fsys::path() / searchLocation.fetch() / moduleName;
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else
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throw error::Config ("Module \""+moduleName+"\" not found"
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+ (searchPath.empty()? ".":" in search path: "+searchPath));
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} }
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} // namespace lib
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