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/*
* Copyright (C) 2011 Timo Weingärtner <timo@tiwe.de>
*
* This file is part of hadori.
*
* hadori is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* Foobar is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with hadori. If not, see <http://www.gnu.org/licenses/>.
*/
#include <boost/program_options.hpp>
namespace po = boost::program_options;
#include <string>
#include <vector>
#include <queue>
#include <unordered_map>
#include <iostream>
#include <sstream>
#include <cstdlib>
#include <cstring>
#include <cerrno>
#include <sys/types.h>
#include <sys/stat.h>
#include <dirent.h>
#include <sysexits.h>
#include "inode.h"
#include "version.h"
// needed for equal_range and range-for
namespace std {
template<typename T> T& begin(pair<T,T> & ip) {
return ip.first;
}
template<typename T> T& end(pair<T,T> & ip) {
return ip.second;
}
}
po::variables_map config;
std::ostream debug(std::clog.rdbuf()), verbose(std::clog.rdbuf()), error(std::clog.rdbuf());
void do_link (inode const & i, std::string const & other) {
if (!link(i.filename.c_str(), other.c_str())) {
error << "linking " << i << " to " << other << " succeeded before unlinking (race condition)" << std::endl;
exit(EX_UNAVAILABLE);
}
if (errno != EEXIST) {
char * errstring = strerror(errno);
error << "error linking " << i << " to " << other << ": " << errstring << ", nothing bad happened." << std::endl;
exit(EX_UNAVAILABLE);
}
if (unlink(other.c_str())) {
char * errstring = strerror(errno);
error << "error unlinking " << other << " before linking " << i << " to it: " << errstring << std::endl;
exit(EX_UNAVAILABLE);
}
if (link(i.filename.c_str(), other.c_str())) {
char * errstring = strerror(errno);
error << "error linking " << i << " to " << other << ": " << errstring << ", destination filename was already unlinked." << std::endl;
exit(EX_UNAVAILABLE);
}
}
void handle_file(std::string const & path, struct stat const & s) {
static std::unordered_map<ino_t, inode const> kept;
static std::unordered_map<ino_t, ino_t> to_link;
static std::unordered_multimap<off_t, ino_t> sizes;
debug << "examining " << path << std::endl;
if (kept.count(s.st_ino)) {
debug << "another link to inode " << s.st_ino << " that we keep" << std::endl;
return;
}
if (to_link.count(s.st_ino)) {
inode const & target = kept.find(to_link[s.st_ino])->second;
debug << "another link to inode " << s.st_ino << " that we merge with " << target << std::endl;
do_link(target, path);
if (s.st_nlink == 1)
to_link.erase(s.st_ino);
return;
}
inode f{path, s};
debug << f << " is new to us" << std::endl;
for (auto const & it : sizes.equal_range(s.st_size)) {
inode const & candidate = kept.find(it.second)->second;
debug << "looking if it matches " << candidate << std::endl;
if (candidate.stat.st_mode != s.st_mode)
continue;
if (candidate.stat.st_uid != s.st_uid)
continue;
if (candidate.stat.st_gid != s.st_gid)
continue;
if (not config.count("no-time"))
if (candidate.stat.st_mtime != s.st_mtime)
continue;
if (!compare(candidate, f))
continue;
verbose << "linking " << candidate << " to " << path << std::endl;
if (s.st_nlink > 1)
to_link.insert({s.st_ino, it.second});
if (not config.count("dry-run"))
do_link(candidate, path);
return;
}
debug << "we keep " << f << std::endl;
kept.insert({s.st_ino, f});
sizes.insert({s.st_size, s.st_ino});
}
void recurse (std::string const & dir, dev_t const dev) {
DIR* D;
struct dirent *d;
struct stat s;
std::queue<std::string> subdirs;
if (!(D = opendir(dir.c_str()))) {
char * errstring = strerror(errno);
error << "opendir(\"" << dir << "\"): " << errstring << std::endl;
return;
}
while ((d = readdir(D))) {
std::string path(dir);
path += '/';
path += d->d_name;
if (lstat(path.c_str(), &s)) {
char * errstring = strerror(errno);
error << "lstat(\"" << path << "\"): " << errstring << std::endl;
continue;
}
if (s.st_dev != dev) {
error << path << " resides on another file system, ignoring." << std::endl;
continue;
}
if (S_ISDIR(s.st_mode))
subdirs.push(d->d_name);
if (S_ISREG(s.st_mode))
handle_file(path, s);
}
closedir(D);
// directories get handled after the parent dir is closed to prevent exhausting fds
for (; !subdirs.empty(); subdirs.pop()) {
if (subdirs.front() == "." || subdirs.front() == "..")
continue;
std::string subdir(dir);
subdir += '/';
subdir += subdirs.front();
recurse(subdir, dev);
}
}
void recurse_start (std::string const & dir) {
struct stat s;
if (lstat(dir.c_str(), &s)) {
char * errstring = strerror(errno);
error << "lstat(\"" << dir << "\"): " << errstring << std::endl;
exit(EX_NOINPUT);
}
static dev_t const dev = s.st_dev;
if (dev != s.st_dev) {
error << dir << " resides on another file system, ignoring." << std::endl;
return;
}
if (S_ISDIR(s.st_mode))
recurse(dir, dev);
if (S_ISREG(s.st_mode))
handle_file(dir, s);
}
int main (int const argc, char ** argv) {
po::options_description opts("OPTIONS");
opts.add_options()
("help,h", "print this help message")
("version,V", "print version information")
("no-time,t", "ignore mtime")
("dry-run,n", "don't change anything, implies --verbose")
("verbose,v", "show which files get linked")
("debug,d", "show files being examined")
("stdin,s", "read arguments from stdin, one per line; you can't combine that with arguments on the commandline")
("null,0", "implies --stdin, but use null bytes as delimiter")
;
po::options_description all_opts;
all_opts.add(opts);
all_opts.add_options()
("args", po::value<std::vector<std::string>>(), "files and directories to work on")
;
po::positional_options_description pos_opts;
pos_opts.add("args", -1);
po::store(po::command_line_parser(argc, argv).options(all_opts).positional(pos_opts).run(), config);
po::notify(config);
if (config.count("help")) {
std::cout << "Invocation: hadori [ OPTIONS ] [ ARGUMENTS ]" << std::endl;
std::cout << opts << std::endl;
return EX_OK;
}
if (config.count("version")) {
std::cout << HADORI_VERSION << std::endl;
return EX_OK;
}
if (not config.count("debug"))
debug.rdbuf(nullptr);
if (not config.count("debug") and not config.count("verbose") and not config.count("dry-run"))
verbose.rdbuf(nullptr);
if (config.count("args")) {
if (config.count("stdin") or config.count("null")) {
// not supported because we don't know which arguments to scan first
error << "--stdin combined with commandline arguments, this is not supported." << std::endl;
return EX_USAGE;
}
for(auto const & dir : config["args"].as<std::vector<std::string>>())
recurse_start(dir);
} else {
if (not config.count("stdin") and not config.count("null"))
error << "no arguments supplied, assuming --stdin." << std::endl;
char delim = '\n';
if (config.count("null"))
delim = '\0';
for (std::string dir; getline(std::cin, dir, delim);)
recurse_start(dir);
}
return EX_OK;
}
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