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rmdir.c

/*
*  C Implementation: rmdir
*
* Description: unionfs rmdir() call
*              If the directory to remove exists in a lower branch, create a
*              file with a tag informing other functions that the file
*              is hidden.
*
* original implementation by Radek Podgorny
*
* License: BSD-style license
* Copyright: Radek Podgorny <radek@podgorny.cz>,
*            Bernd Schubert <bernd-schubert@gmx.de>
*
*/

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <strings.h>
#include <unistd.h>
#include <errno.h>
#include <libgen.h>
#include <sys/types.h>
#include <dirent.h>

#include "unionfs.h"
#include "opts.h"
#include "debug.h"
#include "cow.h"
#include "general.h"
#include "findbranch.h"
#include "string.h"

/**
  * If the branch that has the directory to be removed is in read-write mode,
  * we can really delete the file.
  */
static int rmdir_rw(const char *path, int branch_rw) {
      DBG_IN();

      char p[PATHLEN_MAX];
      snprintf(p, PATHLEN_MAX, "%s%s", uopt.branches[branch_rw].path, path);

      int res = rmdir(p);
      if (res == -1) return errno;

      return 0;
}

/**
  * If the branch that has the directory to be removed is in read-only mode,
  * we create a file with a HIDE tag in an upper level branch.
  * To other fuse functions this tag means, not to expose the 
  * lower level directory.
  */
static int rmdir_ro(const char *path, int branch_ro) {
      DBG_IN();

      // find a writable branch above branch_ro
      int branch_rw = find_lowest_rw_branch(branch_ro);

      if (branch_rw < 0) return -EACCES;

      if (hide_dir(path, branch_rw) == -1) {
            switch (errno) {
            case (EEXIST):
            case (ENOTDIR):
            case (ENOTEMPTY):
                  // catch errors not allowed for rmdir()
                  usyslog (LOG_ERR, "%s: Creating the whiteout failed: %s\n",
                        __func__, strerror(errno));
                  errno = EFAULT;
            }
            return errno;
      }

      return 0;
}

/**
  * rmdir() call
  */
int unionfs_rmdir(const char *path) {
      DBG_IN();

      to_user();

      int i = find_rorw_branch(path);
      if (i == -1) {
            to_root();
            return -errno;
      }

      int res;
      if (!uopt.branches[i].rw) {
            // read-only branch
            if (!uopt.cow_enabled)
                  res = EROFS;
            else
                  res = rmdir_ro(path, i);
      } else {
            // read-write branch
            res = rmdir_rw(path, i);
            if (res == 0) {
                  // No need to be root, whiteouts are created as root!
                  maybe_whiteout(path, i, WHITEOUT_DIR);
            }
      }

      to_root();
      return -res;
}

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