maildir-writecache.cc

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#include <dirent.h>
#include <fcntl.h>
#include <unistd.h>
 
#include "globals.h"
#include "maildir.h"
 
using namespace ::std;
 
//------------------------------------------------------------------------
bool Binc::Maildir::writeCache(void)
{
  if (readOnly)
    return true;
 
  char *safename = strdup((path + "/.bincimap-cache-tmp-XXXXXX").c_str());
  int fd = mkstemp(safename);
  if (!fd) {
    free(safename);
    return false;
  }
 
  string safeName = safename;
  free(safename);
 
  FILE *fp = fdopen(fd, "w");
  if (!fp) {
    unlink(safeName.c_str());
    return false;
  }
 
  if (uidvalidity == 0 || uidnext == 0) {
    uidvalidity = time(0);
    uidnext = messages.size() + 1;
  }
 
  fprintf(fp, "%s %u %u\n", BINC_CACHE, uidvalidity, uidnext);
  Mailbox::iterator i = begin(SequenceSet::all(), INCLUDE_EXPUNGED);
  for (; i != end(); ++i) {
    MaildirMessage &message = (MaildirMessage &)*i;
    fprintf(fp, "%u %u %u %s", message.getUID(), 
               (unsigned int) message.getInternalDate(), message.getSize(),
               message.getUnique().c_str());
    vector<string> cflags = message.getCustomFlags();
    for (vector<string>::const_iterator it = cflags.begin();
         it != cflags.end(); ++it) {
      fprintf(fp, " %s", (*it).c_str());
    }
    fprintf(fp, "\n");
  }
 
  if (fflush(fp) || (fsync(fd) && (errno != EROFS || errno != EINVAL)) || fclose(fp)) {
    unlink(safeName.c_str());
    return false;
  }
 
  if (rename(safeName.c_str(), (path + "/bincimap-cache").c_str()) != 0) {
    unlink(safeName.c_str());
    return false;
  }
 
  int dfd = open(path.c_str(), O_RDONLY);
  if (dfd == -1 || (fsync(fd) && (errno != EROFS || errno != EINVAL)) || close(dfd)) {
    return false;
  }
 
  return true;
}