mariadb-columnstore-engine/storage-manager/src/smrm.cpp

/* Copyright (C) 2019 MariaDB Corporation

   This program 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; version 2 of
   the License.

   This program 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 this program; if not, write to the Free Software
   Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
   MA 02110-1301, USA. */

#include <iostream>
#include "IOCoordinator.h"
#include "messageFormat.h"
#include "SMFileSystem.h"
#include <unistd.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/un.h>

using namespace std;
using namespace storagemanager;

void usage(const char* progname)
{
  cerr << progname << " is like 'rm -rf' for files managed by StorageManager, but with no options or globbing"
       << endl;
  cerr << "Usage: " << progname << " file-or-dir1 file-or-dir2 .. file-or-dirN" << endl;
}

bool SMOnline()
{
  struct sockaddr_un addr;
  memset(&addr, 0, sizeof(addr));
  addr.sun_family = AF_UNIX;
  strcpy(&addr.sun_path[1], &socket_name[1]);  // first char is null...
  int clientSocket = ::socket(AF_UNIX, SOCK_STREAM, 0);
  int err = ::connect(clientSocket, (const struct sockaddr*)&addr, sizeof(addr));
  if (err >= 0)
  {
    ::close(clientSocket);
    return true;
  }
  return false;
}

#define min(x, y) (x < y ? x : y)

void rmOffline(int argCount, const char** args, const char* prefix, uint prefixlen)
{
  try
  {
    boost::scoped_ptr<IOCoordinator> ioc(IOCoordinator::get());
    char buf[16384];
    strncpy(buf, prefix, prefixlen);

    for (int i = 1; i < argCount; i++)
    {
      memcpy(&buf[prefixlen], args[i], min(16383 - prefixlen, strlen(args[i])) + 1);
      ioc->unlink(buf);
    }
  }
  catch (exception& e)
  {
    cerr << "smrm rmOffline FAIL: " << e.what() << endl;
  }
}

void rmOnline(int argCount, const char** args, const char* prefix, uint prefixlen)
{
  idbdatafile::SMFileSystem fs;
  char buf[16384];
  strncpy(buf, prefix, prefixlen);

  for (int i = 1; i < argCount; i++)
  {
    memcpy(&buf[prefixlen], args[i], min(16383 - prefixlen, strlen(args[i])) + 1);
    fs.remove((char*)memcpy(&buf[prefixlen], args[i], min(16383 - prefixlen, strlen(args[i])) + 1));
  }
}

int makePathPrefix(char* target, int targetlen)
{
  // MCOL-3438 -> add bogus directories to the front of each param
  Config* config = Config::get();
  int prefixDepth = stoi(config->getValue("ObjectStorage", "common_prefix_depth"));
  target[0] = '/';
  target[1] = 0;
  int bufpos = 1;

  for (int i = 0; i < prefixDepth; i++)
  {
    if (bufpos + 3 >= targetlen)
    {
      cerr << "invalid prefix depth in ObjectStorage/common_prefix_depth";
      exit(1);
    }
    memcpy(&target[bufpos], "x/\0", 3);
    bufpos += 2;
  }
  return bufpos;
}

int main(int argc, const char** argv)
{
  if (argc < 2)
  {
    usage(argv[0]);
    return 1;
  }

  char prefix[8192];
  uint prefixlen = makePathPrefix(prefix, 8192);

  if (SMOnline())
    rmOnline(argc, argv, prefix, prefixlen);
  else
    rmOffline(argc, argv, prefix, prefixlen);
  return 0;
}