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110 lines
2.9 KiB
110 lines
2.9 KiB
/*
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The MIT License (MIT)
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Copyright (c) 2014 Antonio SJ Musumeci <trapexit@spawn.link>
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Permission is hereby granted, free of charge, to any person obtaining a copy
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of this software and associated documentation files (the "Software"), to deal
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in the Software without restriction, including without limitation the rights
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to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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copies of the Software, and to permit persons to whom the Software is
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furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in
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all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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THE SOFTWARE.
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*/
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#include <fuse.h>
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#include <string>
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#include <vector>
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#include <errno.h>
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#include <unistd.h>
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#include "config.hpp"
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#include "fs.hpp"
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#include "ugid.hpp"
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#include "assert.hpp"
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using std::string;
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using std::vector;
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using mergerfs::Policy;
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static
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int
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_link(const fs::SearchFunc searchFunc,
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const vector<string> &srcmounts,
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const string from,
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const string to)
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{
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int rv;
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int error;
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fs::PathVector paths;
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searchFunc(srcmounts,from,paths);
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if(paths.empty())
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return -ENOENT;
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rv = -1;
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error = 0;
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for(fs::PathVector::const_iterator
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i = paths.begin(), ei = paths.end(); i != ei; ++i)
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{
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int lrv;
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const string pathfrom = fs::make_path(i->base,from);
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const string pathto = fs::make_path(i->base,to);
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lrv = ::link(pathfrom.c_str(),pathto.c_str());
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if(lrv == -1 && errno == ENOENT)
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{
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string todir;
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fs::PathVector topaths;
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todir = fs::dirname(to);
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fs::find::ffwp(srcmounts,todir,topaths);
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if(topaths.size() > 0)
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{
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fs::clonepath(topaths[0].base,i->base,todir);
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lrv = ::link(pathfrom.c_str(),pathto.c_str());
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}
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}
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rv &= lrv;
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if(rv == -1)
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error = errno;
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}
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return ((rv == -1) ? -error : 0);
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}
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namespace mergerfs
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{
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namespace link
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{
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int
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link(const char *from,
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const char *to)
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{
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const struct fuse_context *fc = fuse_get_context();
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const config::Config &config = config::get();
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const ugid::SetResetGuard ugid(fc->uid,fc->gid);
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if(from == config.controlfile)
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return -EPERM;
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return _link(*config.action,
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config.srcmounts,
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from,
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to);
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}
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}
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}
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