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/*
Copyright (c) 2016, Antonio SJ Musumeci <trapexit@spawn.link>
Permission to use, copy, modify, and/or distribute this software for any
purpose with or without fee is hereby granted, provided that the above
copyright notice and this permission notice appear in all copies.
THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include "config.hpp"
#include "errno.hpp"
#include "fs_base_symlink.hpp"
#include "fs_clonepath.hpp"
#include "fs_path.hpp"
#include "rv.hpp"
#include "ugid.hpp"
#include <fuse.h>
#include <string>
#include <sys/types.h>
#include <unistd.h>
using std::string;
using std::vector;
namespace l
{
static
int
symlink_loop_core(const string &newbasepath_,
const char *oldpath_,
const char *newpath_,
const int error_)
{
int rv;
string fullnewpath;
fullnewpath = fs::path::make(&newbasepath_,newpath_);
rv = fs::symlink(oldpath_,fullnewpath);
return error::calc(rv,error_,errno);
}
static
int
symlink_loop(const string &existingpath_,
const vector<string> &newbasepaths_,
const char *oldpath_,
const char *newpath_,
const string &newdirpath_)
{
int rv;
int error;
error = -1;
for(size_t i = 0, ei = newbasepaths_.size(); i != ei; i++)
{
rv = fs::clonepath_as_root(existingpath_,newbasepaths_[i],newdirpath_);
if(rv == -1)
error = error::calc(rv,error,errno);
else
error = l::symlink_loop_core(newbasepaths_[i],
oldpath_,
newpath_,
error);
}
return -error;
}
static
int
symlink(Policy::Func::Search searchFunc_,
Policy::Func::Create createFunc_,
const Branches &branches_,
const uint64_t minfreespace_,
const char *oldpath_,
const char *newpath_)
{
int rv;
string newdirpath;
vector<string> newbasepaths;
vector<string> existingpaths;
newdirpath = fs::path::dirname(newpath_);
rv = searchFunc_(branches_,newdirpath,minfreespace_,&existingpaths);
if(rv == -1)
return -errno;
rv = createFunc_(branches_,newdirpath,minfreespace_,&newbasepaths);
if(rv == -1)
return -errno;
return l::symlink_loop(existingpaths[0],newbasepaths,
oldpath_,newpath_,newdirpath);
}
}
namespace FUSE
{
int
symlink(const char *oldpath_,
const char *newpath_)
{
const fuse_context *fc = fuse_get_context();
const Config &config = Config::ro();
const ugid::Set ugid(fc->uid,fc->gid);
return l::symlink(config.func.getattr.policy,
config.func.symlink.policy,
config.branches,
config.minfreespace,
oldpath_,
newpath_);
}
}