gnu/usr.bin/cpio/copypass.c

/* copypass.c - cpio copy pass sub-function.
   Copyright (C) 1990, 1991, 1992 Free Software Foundation, Inc.

   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; either version 2, or (at your option)
   any later version.

   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., 675 Mass Ave, Cambridge, MA 02139, USA.  */

#include <stdio.h>
#include <sys/types.h>
#include <sys/stat.h>
#include "filetypes.h"
#include "system.h"
#include "cpiohdr.h"
#include "dstring.h"
#include "extern.h"

#ifndef HAVE_LCHOWN
#define lchown chown
#endif

/* Copy files listed on the standard input into directory `directory_name'.
   If `link_flag', link instead of copying.  */

void
process_copy_pass ()
{
  dynamic_string input_name;    /* Name of file from stdin.  */
  dynamic_string output_name;   /* Name of new file.  */
  int dirname_len;              /* Length of `directory_name'.  */
  int res;                      /* Result of functions.  */
  char *slash;                  /* For moving past slashes in input name.  */
  struct utimbuf times;         /* For resetting file times after copy.  */
  struct stat in_file_stat;     /* Stat record for input file.  */
  struct stat out_file_stat;    /* Stat record for output file.  */
  int in_file_des;              /* Input file descriptor.  */
  int out_file_des;             /* Output file descriptor.  */
  int existing_dir;             /* True if file is a dir & already exists.  */
#ifdef HPUX_CDF
  int cdf_flag;
  int cdf_char;
#endif

  /* Initialize the copy pass.  */
  dirname_len = strlen (directory_name);
  ds_init (&input_name, 128);
  ds_init (&output_name, dirname_len + 2);
  strcpy (output_name.ds_string, directory_name);
  output_name.ds_string[dirname_len] = '/';
  output_is_seekable = TRUE;
  /* Initialize this in case it has members we don't know to set.  */
  bzero (&times, sizeof (struct utimbuf));

  /* Copy files with names read from stdin.  */
  while (ds_fgetstr (stdin, &input_name, name_end) != NULL)
    {
      int link_res = -1;

      /* Check for blank line and ignore it if found.  */
      if (input_name.ds_string[0] == '\0')
        {
          error (0, 0, "blank line ignored");
          continue;
        }

      /* Check for current directory and ignore it if found.  */
      if (input_name.ds_string[0] == '.'
          && (input_name.ds_string[1] == '\0'
              || (input_name.ds_string[1] == '/'
                  && input_name.ds_string[2] == '\0')))
        continue;

      if ((*xstat) (input_name.ds_string, &in_file_stat) < 0)
        {
          error (0, errno, "%s", input_name.ds_string);
          continue;
        }

      /* Make the name of the new file.  */
      for (slash = input_name.ds_string; *slash == '/'; ++slash)
        ;
#ifdef HPUX_CDF
      /* For CDF's we add a 2nd `/' after all "hidden" directories.
         This kind of a kludge, but it's what we do when creating
         archives, and it's easier to do this than to separately
         keep track of which directories in a path are "hidden".  */
      slash = add_cdf_double_slashes (slash);
#endif
      ds_resize (&output_name, dirname_len + strlen (slash) + 2);
      strcpy (output_name.ds_string + dirname_len + 1, slash);

      existing_dir = FALSE;
      if (lstat (output_name.ds_string, &out_file_stat) == 0)
        {
          if (S_ISDIR (out_file_stat.st_mode)
              && S_ISDIR (in_file_stat.st_mode))
            {
              /* If there is already a directory there that
                 we are trying to create, don't complain about it.  */
              existing_dir = TRUE;
            }
          else if (!unconditional_flag
                   && in_file_stat.st_mtime <= out_file_stat.st_mtime)
            {
              error (0, 0, "%s not created: newer or same age version exists",
                     output_name.ds_string);
              continue;         /* Go to the next file.  */
            }
          else if (S_ISDIR (out_file_stat.st_mode)
                        ? rmdir (output_name.ds_string)
                        : unlink (output_name.ds_string))
            {
              error (0, errno, "cannot remove current %s",
                     output_name.ds_string);
              continue;         /* Go to the next file.  */
            }
        }

      /* Do the real copy or link.  */
      if (S_ISREG (in_file_stat.st_mode))
        {
#ifndef __MSDOS__
          /* Can the current file be linked to a another file?
             Set link_name to the original file name.  */
          if (link_flag)
            /* User said to link it if possible.  Try and link to
               the original copy.  If that fails we'll still try
               and link to a copy we've already made.  */
            link_res = link_to_name (output_name.ds_string,
                                     input_name.ds_string);
          if ( (link_res < 0) && (in_file_stat.st_nlink > 1) )
            link_res = link_to_maj_min_ino (output_name.ds_string,
                                major (in_file_stat.st_dev),
                                minor (in_file_stat.st_dev),
                                in_file_stat.st_ino);
#endif

          /* If the file was not linked, copy contents of file.  */
          if (link_res < 0)
            {
              in_file_des = open (input_name.ds_string,
                                  O_RDONLY | O_BINARY, 0);
              if (in_file_des < 0)
                {
                  error (0, errno, "%s", input_name.ds_string);
                  continue;
                }
              out_file_des = open (output_name.ds_string,
                                   O_CREAT | O_WRONLY | O_BINARY, 0600);
              if (out_file_des < 0 && create_dir_flag)
                {
                  create_all_directories (output_name.ds_string);
                  out_file_des = open (output_name.ds_string,
                                       O_CREAT | O_WRONLY | O_BINARY, 0600);
                }
              if (out_file_des < 0)
                {
                  error (0, errno, "%s", output_name.ds_string);
                  close (in_file_des);
                  continue;
                }

              copy_files (in_file_des, out_file_des, in_file_stat.st_size);
              empty_output_buffer (out_file_des);
              if (close (in_file_des) < 0)
                error (0, errno, "%s", input_name.ds_string);
              if (close (out_file_des) < 0)
                error (0, errno, "%s", output_name.ds_string);

              /* Set the attributes of the new file.  */
              if (!no_chown_flag)
                if ((chown (output_name.ds_string,
                            set_owner_flag ? set_owner : in_file_stat.st_uid,
                      set_group_flag ? set_group : in_file_stat.st_gid) < 0)
                    && errno != EPERM)
                  error (0, errno, "%s", output_name.ds_string);
              /* chown may have turned off some permissions we wanted. */
              if (chmod (output_name.ds_string, in_file_stat.st_mode) < 0)
                error (0, errno, "%s", output_name.ds_string);
              if (reset_time_flag)
                {
                  times.actime = in_file_stat.st_atime;
                  times.modtime = in_file_stat.st_mtime;
                  if (utime (input_name.ds_string, &times) < 0)
                    error (0, errno, "%s", input_name.ds_string);
                  if (utime (output_name.ds_string, &times) < 0)
                    error (0, errno, "%s", output_name.ds_string);
                }
              if (retain_time_flag)
                {
                  times.actime = times.modtime = in_file_stat.st_mtime;
                  if (utime (output_name.ds_string, &times) < 0)
                    error (0, errno, "%s", output_name.ds_string);
                }
            }
        }
      else if (S_ISDIR (in_file_stat.st_mode))
        {
#ifdef HPUX_CDF
          cdf_flag = 0;
#endif
          if (!existing_dir)
            {
#ifdef HPUX_CDF
              /* If the directory name ends in a + and is SUID,
                 then it is a CDF.  Strip the trailing + from the name
                 before creating it.  */
              cdf_char = strlen (output_name.ds_string) - 1;
              if ( (cdf_char > 0) &&
                   (in_file_stat.st_mode & 04000) &&
                   (output_name.ds_string [cdf_char] == '+') )
                {
                  output_name.ds_string [cdf_char] = '\0';
                  cdf_flag = 1;
                }
#endif
              res = mkdir (output_name.ds_string, in_file_stat.st_mode);

            }
          else
            res = 0;
          if (res < 0 && create_dir_flag)
            {
              create_all_directories (output_name.ds_string);
              res = mkdir (output_name.ds_string, in_file_stat.st_mode);
            }
          if (res < 0)
            {
              error (0, errno, "%s", output_name.ds_string);
              continue;
            }
          if (!no_chown_flag)
            if ((chown (output_name.ds_string,
                        set_owner_flag ? set_owner : in_file_stat.st_uid,
                      set_group_flag ? set_group : in_file_stat.st_gid) < 0)
                && errno != EPERM)
              error (0, errno, "%s", output_name.ds_string);
          /* chown may have turned off some permissions we wanted. */
          if (chmod (output_name.ds_string, in_file_stat.st_mode) < 0)
            error (0, errno, "%s", output_name.ds_string);
#ifdef HPUX_CDF
          if (cdf_flag)
            /* Once we "hide" the directory with the chmod(),
               we have to refer to it using name+ isntead of name.  */
            output_name.ds_string [cdf_char] = '+';
#endif
          if (retain_time_flag)
            {
              times.actime = times.modtime = in_file_stat.st_mtime;
              if (utime (output_name.ds_string, &times) < 0)
                error (0, errno, "%s", output_name.ds_string);
            }
        }
#ifndef __MSDOS__
      else if (S_ISCHR (in_file_stat.st_mode) ||
               S_ISBLK (in_file_stat.st_mode) ||
#ifdef S_ISFIFO
               S_ISFIFO (in_file_stat.st_mode) ||
#endif
#ifdef S_ISSOCK
               S_ISSOCK (in_file_stat.st_mode) ||
#endif
               0)
        {
          /* Can the current file be linked to a another file?
             Set link_name to the original file name.  */
          if (link_flag)
            /* User said to link it if possible.  */
            link_res = link_to_name (output_name.ds_string,
                                     input_name.ds_string);
          if ( (link_res < 0) && (in_file_stat.st_nlink > 1) )
            link_res = link_to_maj_min_ino (output_name.ds_string,
                        major (in_file_stat.st_dev),
                        minor (in_file_stat.st_dev),
                        in_file_stat.st_ino);

          if (link_res < 0)
            {
              res = mknod (output_name.ds_string, in_file_stat.st_mode,
                           in_file_stat.st_rdev);
              if (res < 0 && create_dir_flag)
                {
                  create_all_directories (output_name.ds_string);
                  res = mknod (output_name.ds_string, in_file_stat.st_mode,
                               in_file_stat.st_rdev);
                }
              if (res < 0)
                {
                  error (0, errno, "%s", output_name.ds_string);
                  continue;
                }
              if (!no_chown_flag)
                if ((chown (output_name.ds_string,
                            set_owner_flag ? set_owner : in_file_stat.st_uid,
                          set_group_flag ? set_group : in_file_stat.st_gid) < 0)
                    && errno != EPERM)
                  error (0, errno, "%s", output_name.ds_string);
              /* chown may have turned off some permissions we wanted. */
              if (chmod (output_name.ds_string, in_file_stat.st_mode) < 0)
                error (0, errno, "%s", output_name.ds_string);
              if (retain_time_flag)
                {
                  times.actime = times.modtime = in_file_stat.st_mtime;
                  if (utime (output_name.ds_string, &times) < 0)
                    error (0, errno, "%s", output_name.ds_string);
                }
            }
        }
#endif

#ifdef S_ISLNK
      else if (S_ISLNK (in_file_stat.st_mode))
        {
          char *link_name;
          link_name = (char *) xmalloc ((unsigned int) in_file_stat.st_size + 1);

          if (readlink (input_name.ds_string, link_name,
                        in_file_stat.st_size) < 0)
            {
              error (0, errno, "%s", input_name.ds_string);
              free (link_name);
              continue;
            }
          link_name[in_file_stat.st_size] = '\0';

          res = UMASKED_SYMLINK (link_name, output_name.ds_string,
                                 in_file_stat.st_mode);
          if (res < 0 && create_dir_flag)
            {
              create_all_directories (output_name.ds_string);
              res = UMASKED_SYMLINK (link_name, output_name.ds_string,
                                     in_file_stat.st_mode);
            }
          if (res < 0)
            {
              error (0, errno, "%s", output_name.ds_string);
              free (link_name);
              continue;
            }

          /* Set the attributes of the new link.  */
          if (!no_chown_flag)
            if ((lchown (output_name.ds_string,
                         set_owner_flag ? set_owner : in_file_stat.st_uid,
                      set_group_flag ? set_group : in_file_stat.st_gid) < 0)
                && errno != EPERM)
              error (0, errno, "%s", output_name.ds_string);
          free (link_name);
        }
#endif
      else
        {
          error (0, 0, "%s: unknown file type", input_name.ds_string);
        }

      if (verbose_flag)
        fprintf (stderr, "%s\n", output_name.ds_string);
      if (dot_flag)
        fputc ('.', stderr);
    }

  if (dot_flag)
    fputc ('\n', stderr);
  res = (output_bytes + io_block_size - 1) / io_block_size;
  if (res == 1)
    fprintf (stderr, "1 block\n");
  else
    fprintf (stderr, "%d blocks\n", res);
}
\f
/* Try and create a hard link from FILE_NAME to another file
   with the given major/minor device number and inode.  If no other
   file with the same major/minor/inode numbers is known, add this file
   to the list of known files and associated major/minor/inode numbers
   and return -1.  If another file with the same major/minor/inode
   numbers is found, try and create another link to it using
   link_to_name, and return 0 for success and -1 for failure.  */

int
link_to_maj_min_ino (file_name, st_dev_maj, st_dev_min, st_ino)
  char *file_name;
  int st_dev_maj;
  int st_dev_min;
  int st_ino;
{
  int   link_res;
  char *link_name;
  link_res = -1;
#ifndef __MSDOS__
  /* Is the file a link to a previously copied file?  */
  link_name = find_inode_file (st_ino,
                               st_dev_maj,
                               st_dev_min);
  if (link_name == NULL)
    add_inode (st_ino, file_name,
               st_dev_maj,
               st_dev_min);
  else
    link_res = link_to_name (file_name, link_name);
#endif
  return link_res;
}
\f
/* Try and create a hard link from LINK_NAME to LINK_TARGET.  If
   `create_dir_flag' is set, any non-existent (parent) directories
   needed by LINK_NAME will be created.  If the link is successfully
   created and `verbose_flag' is set, print "LINK_TARGET linked to LINK_NAME\n".
   If the link can not be created and `link_flag' is set, print
   "cannot link LINK_TARGET to LINK_NAME\n".  Return 0 if the link
   is created, -1 otherwise.  */

int
link_to_name (link_name, link_target)
  char *link_name;
  char *link_target;
{
  int res;
#ifdef __MSDOS__
  res = -1;
#else /* not __MSDOS__ */
  res = link (link_target, link_name);
  if (res < 0 && create_dir_flag)
    {
      create_all_directories (link_name);
      res = link (link_target, link_name);
    }
  if (res == 0)
    {
      if (verbose_flag)
        error (0, 0, "%s linked to %s",
               link_target, link_name);
    }
  else if (link_flag)
    {
      error (0, errno, "cannot link %s to %s",
             link_target, link_name);
    }
#endif /* not __MSDOS__ */
  return res;
}