mirror of
https://github.com/trapexit/mergerfs.git
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135 lines
3.4 KiB
C++
135 lines
3.4 KiB
C++
/*
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Copyright (c) 2016, Antonio SJ Musumeci <trapexit@spawn.link>
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Permission to use, copy, modify, and/or distribute this software for any
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purpose with or without fee is hereby granted, provided that the above
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copyright notice and this permission notice appear in all copies.
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THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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#include "config.hpp"
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#include "errno.hpp"
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#include "fs_lstat.hpp"
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#include "fs_path.hpp"
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#include "fs_readlink.hpp"
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#include "symlinkify.hpp"
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#include "ugid.hpp"
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#include "fuse.h"
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#include <string.h>
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using std::string;
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namespace l
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{
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static
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int
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readlink_core_standard(const string &fullpath_,
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char *buf_,
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const size_t size_)
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{
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int rv;
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rv = fs::readlink(fullpath_,buf_,size_);
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if(rv == -1)
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return -errno;
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buf_[rv] = '\0';
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return 0;
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}
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static
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int
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readlink_core_symlinkify(const string &fullpath_,
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char *buf_,
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const size_t size_,
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const time_t symlinkify_timeout_)
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{
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int rv;
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struct stat st;
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rv = fs::lstat(fullpath_,&st);
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if(rv == -1)
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return -errno;
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if(!symlinkify::can_be_symlink(st,symlinkify_timeout_))
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return l::readlink_core_standard(fullpath_,buf_,size_);
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strncpy(buf_,fullpath_.c_str(),size_);
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return 0;
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}
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static
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int
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readlink_core(const string &basepath_,
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const char *fusepath_,
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char *buf_,
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const size_t size_,
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const bool symlinkify_,
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const time_t symlinkify_timeout_)
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{
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string fullpath;
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fullpath = fs::path::make(basepath_,fusepath_);
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if(symlinkify_)
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return l::readlink_core_symlinkify(fullpath,buf_,size_,symlinkify_timeout_);
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return l::readlink_core_standard(fullpath,buf_,size_);
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}
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static
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int
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readlink(const Policy::Search &searchFunc_,
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const Branches &branches_,
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const char *fusepath_,
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char *buf_,
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const size_t size_,
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const bool symlinkify_,
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const time_t symlinkify_timeout_)
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{
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int rv;
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StrVec basepaths;
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rv = searchFunc_(branches_,fusepath_,&basepaths);
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if(rv == -1)
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return -errno;
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return l::readlink_core(basepaths[0],fusepath_,buf_,size_,
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symlinkify_,symlinkify_timeout_);
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}
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}
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namespace FUSE
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{
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int
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readlink(const char *fusepath_,
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char *buf_,
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size_t size_)
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{
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Config::Read cfg;
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const fuse_context *fc = fuse_get_context();
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const ugid::Set ugid(fc->uid,fc->gid);
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return l::readlink(cfg->func.readlink.policy,
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cfg->branches,
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fusepath_,
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buf_,
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size_,
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cfg->symlinkify,
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cfg->symlinkify_timeout);
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}
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}
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