source: trunk/athena/bin/delete/delete.c @ 12144

/*
 * $Source: /afs/dev.mit.edu/source/repository/athena/bin/delete/delete.c,v $
 * $Author: ghudson $
 *
 * This program is a replacement for rm.  Instead of actually deleting
 * files, it marks them for deletion by prefixing them with a ".#"
 * prefix.
 *
 * Copyright (c) 1989 by the Massachusetts Institute of Technology.
 * For copying and distribution information, see the file "mit-copying.h."
 */

#if (!defined(lint) && !defined(SABER))
     static char rcsid_delete_c[] = "$Header: /afs/dev.mit.edu/source/repository/athena/bin/delete/delete.c,v 1.32 1998-11-16 16:42:05 ghudson Exp $";
#endif

#include <sys/types.h>
#ifdef HAVE_AFS
#include <sys/time.h>
#endif
#include <stdio.h>
#include <dirent.h>
#include <string.h>
#include <unistd.h>

#include <sys/param.h>
#include <errno.h>
#include "errors.h"
#include "delete_errs.h"
#include "util.h"
#include "delete.h"
#include "mit-copying.h"



/*
 * ALGORITHM:
 *
 * 1. Parse command-line arguments and set flags.
 * 2. Call the function delete() for each filename command-line argument.
 *
 * delete():
 *
 * 1. Can the file be lstat'd?
 *    no -- abort
 *    yes -- continue
 * 2. Is the file a directory?
 *    yes -- is it a dotfile?
 *           yes -- abort
 *           no -- continue
 *        -- is the filesonly option set?
 *           yes -- is the recursive option specified?
 *                  yes -- continue
 *                  no -- abort
 *           no -- is the directory empty?
 *                  yes -- remove it
 *                  no -- is the directoriesonly option set?
 *                        yes -- abort
 *                        no -- continue
 *                     -- is the recursive option specified?
 *                        yes -- continue
 *                        no -- abort
 *    no -- is the directoriesonly option set?
 *          yes -- abort
 *          no -- continue
 * 3. If the file is a file, remove it.
 * 4. If the file is a directory, open it and pass each of its members
 *    (excluding . files) to delete().
 */


int force, interactive, recursive, noop, verbose, filesonly, directoriesonly;
int emulate_rm, linked_to_rm, linked_to_rmdir;
#ifdef HAVE_AFS
struct timeval tvp[2];
#endif

main(argc, argv)
int argc;
char *argv[];
{
     extern char *optarg;
     extern int optind;
     int arg;
     
     whoami = lastpart(argv[0]);

     initialize_del_error_table();

#ifdef HAVE_AFS
     gettimeofday(&tvp[0], (struct timezone *)0);
     tvp[1] = tvp[0];
#endif

     force = interactive = recursive = noop = verbose = filesonly =
          directoriesonly = emulate_rm = linked_to_rm = linked_to_rmdir = 0;

     if (!strcmp(whoami, "rm"))
          emulate_rm++, filesonly++, linked_to_rm++;
     if (!strcmp(whoami, "rmdir") || !strcmp(whoami, "rd"))
          emulate_rm++, directoriesonly++, linked_to_rmdir++;
     
     while ((arg = getopt(argc, argv, "efirnvFD")) != -1) {
          switch (arg) {
          case 'r':
               recursive++;
               if (directoriesonly) {
                    fprintf(stderr, "%s: -r and -D are mutually exclusive.\n",
                            whoami);
                    usage();
                    exit(1);
               }
               break;
          case 'f':
               force++;
               break;
          case 'i':
               interactive++;
               break;
          case 'n':
               noop++;
               break;
          case 'v':
               verbose++;
               break;
          case 'e':
               emulate_rm++;
               break;
          case 'F':
               filesonly++;
               if (directoriesonly) {
                    fprintf(stderr, "%s: -F and -D are mutually exclusive.\n",
                            whoami);
                    usage();
                    exit(1);
               }
               break;
          case 'D':
               directoriesonly++;
               if (recursive) {
                    fprintf(stderr, "%s: -r and -D are mutually exclusive.\n",
                            whoami);
                    usage();
                    exit(1);
               }
               if (filesonly) {
                    fprintf(stderr, "%s: -F and -D are mutually exclusive.\n",
                            whoami);
                    usage();
                    exit(1);
               }
               break;
          default:
               usage();
               exit(1);
          }
     }
     report_errors = ! (force || emulate_rm);
     
     if (optind == argc) {
          if (! force) {
               fprintf(stderr, "%s: no files specified.\n", whoami);
               usage();
          }
          exit(force ? 0 : 1);
     }
     while (optind < argc) {
          if (delete(argv[optind], 0))
               error(argv[optind]);
          optind++;
     }
     exit(((! force) && error_occurred) ? 1 : 0);
}



usage()
{
     printf("Usage: %s [ options ] filename ...\n", whoami);
     printf("Options are:\n");
     if (! linked_to_rmdir)
          printf("     -r     recursive\n");
     printf("     -i     interactive\n");
     printf("     -f     force\n");
     printf("     -n     noop\n");
     printf("     -v     verbose\n");
     if (! (linked_to_rmdir || linked_to_rm)) {
          printf("     -e     emulate rm/rmdir\n");
          printf("     -F     files only\n");
          printf("     -D     directories only\n");
     }
     printf("     --     end options and start filenames\n");
     if (! (linked_to_rmdir || linked_to_rm)) {
          printf("-r and -D are mutually exclusive\n");
          printf("-F and -D are mutually exclusive\n");
     }
}




delete(filename, recursed)
char *filename;
int recursed;
{
     struct stat stat_buf;
     int retval;
     
     /* can the file be lstat'd? */
     if (lstat(filename, &stat_buf) == -1) {
          set_error(errno);
          if (emulate_rm && (! force))
               fprintf(stderr, "%s: %s nonexistent\n", whoami, filename);
          error(filename);
          return error_code;
     }

     /* is the file a directory? */
     if ((stat_buf.st_mode & S_IFMT) == S_IFDIR) {
          /* is the file a dot file? */
          if (is_dotfile(lastpart(filename))) {
               set_error(DELETE_IS_DOTFILE);
               if (emulate_rm && (! force))
                    fprintf(stderr, "%s: cannot remove `.' or `..'\n", whoami);
               error(filename);
               return error_code;
          }

          /* is the filesonly option set? */
          if (filesonly) {
               /* is the recursive option specified? */
               if (recursive) {
                    if (retval = recursive_delete(filename, stat_buf,
                                                  recursed)) {
                         error(filename);
                         return retval;
                    }
               }
               else {
                    if (emulate_rm && (! force))
                         fprintf(stderr, "%s: %s directory\n", whoami,
                                 filename);
                    set_error(DELETE_CANT_DEL_DIR);
                    error(filename);
                    return error_code;
               }
          }
          else {
               /* is the directory empty? */
               if ((retval = empty_directory(filename)) < 0) {
                    error(filename);
                    if (! emulate_rm)
                         return error_code;
               }

               if (retval > 0) {
                    /* remove it */
                    if (retval = do_move(filename, stat_buf, 0)) {
                         error(filename);
                         return error_code;
                    }
               }
               else {
                    /* is the directoriesonly option set? */
                    if (directoriesonly) {
                         if (emulate_rm && (! force))
                              fprintf(stderr, "%s: %s: Directory not empty\n",
                                      whoami, filename);
                         set_error(DELETE_DIR_NOT_EMPTY);
                         error(filename);
                         return error_code;
                    }
                    else {
                         /* is the recursive option specified? */
                         if (recursive) {
                              if (retval = recursive_delete(filename, stat_buf,
                                                            recursed)) {
                                   error(filename);
                                   return error_code;
                              }
                         }
                         else {
                              if (emulate_rm && (! force))
                                   fprintf(stderr, "%s: %s not empty\n",
                                           whoami, filename);
                              set_error(DELETE_DIR_NOT_EMPTY);
                              error(filename);
                              return error_code;
                         }
                    }
               }
          }
     }
     else {
          /* is the directoriesonly option set? */
          if (directoriesonly) {
               if (emulate_rm && (! force))
                    fprintf(stderr, "%s: %s: Not a directory\n", whoami,
                            filename);
               set_error(DELETE_CANT_DEL_FILE);
               error(filename);
               return error_code;
          }
          else {
               if (retval = do_move(filename, stat_buf, 0)) {
                    error(filename);
                    return error_code;
               }
          }
     }
     return 0;
}
          

                 
                         
               
empty_directory(filename)
char *filename;
{
     DIR *dirp;
     struct dirent *dp;

     dirp = Opendir(filename);
     if (! dirp) {
          set_error(errno);
          error(filename);
          return -1;
     }
     for (dp = readdir(dirp); dp != NULL; dp = readdir(dirp)) {
          if (is_dotfile(dp->d_name))
               continue;
          if (is_deleted(dp->d_name))
               continue;
          else {
               closedir(dirp);
               return 0;
          }
     }
     closedir(dirp);
     return 1;
}




recursive_delete(filename, stat_buf, recursed)
char *filename;
struct stat stat_buf;
int recursed;
{
     DIR *dirp;
     struct dirent *dp;
     int status = 0;
     char newfile[MAXPATHLEN];
     int retval = 0;
     
     if (interactive && recursed) {
          printf("%s: remove directory %s? ", whoami, filename);
          if (! yes()) {
               set_status(DELETE_NOT_DELETED);
               return error_code;
          }
     }
     dirp = Opendir(filename);
     if (! dirp) {
          if (emulate_rm && (! force))
               fprintf(stderr, "%s: %s not changed\n", whoami, filename);
          set_error(errno);
          error(filename);
          return error_code;
     }
     for (dp = readdir(dirp); dp != NULL; dp = readdir(dirp)) {
          if (is_dotfile(dp->d_name))
               continue;
          if (is_deleted(dp->d_name))
               continue;
          else {
               (void) strcpy(newfile, append(filename, dp->d_name));
               if (! *newfile) {
                    error(filename);
                    status = error_code;
               }

               retval = delete(newfile, 1);
               if (retval) {
                    error(newfile);
                    status = retval;
               }
          }
     }
     closedir(dirp);

     if (status && (! emulate_rm)) {
          set_warning(DELETE_DIR_NOT_EMPTY);
          error(filename);
     }
     else
          retval = do_move(filename, stat_buf, status);
     
     if (retval)
          status = retval;

     return status;
}

                                         




do_move(filename, stat_buf, subs_not_deleted)
char *filename;
struct stat stat_buf;
int subs_not_deleted; /* If the file in question is a directory, and  */
                      /* there is something underneath it that hasn't */
                      /* been removed, this will be set to true.      */
                      /* The program asks if the user wants to delete */
                      /* the directory, and if the user says yes,     */
                      /* checks the value of subs_not_deleted.  If    */
                      /* it's true, an error results.                 */
                      /* This is used only when emulating rm.         */
{
     char *last;
     char buf[MAXPATHLEN];
     char name[MAXNAMLEN];
     struct stat deleted_buf;

     (void) strncpy(buf, filename, MAXPATHLEN);
     last = lastpart(buf);
     if (strlen(last) > MAXNAMLEN) {
          if (emulate_rm && (! force))
               fprintf(stderr, "%s: %s: filename too long\n", whoami,
                       filename);
          set_error(ENAMETOOLONG);
          error(filename);
          return error_code;
     }
     (void) strcpy(name, last);
     if (strlen(buf) + 3 > MAXPATHLEN) {
          if (emulate_rm && (! force))
               fprintf(stderr, "%s: %s: pathname too long\n", whoami,
                       filename);
          set_error(ENAMETOOLONG);
          error(filename);
          return error_code;
     }
     *last = '\0';
     (void) strcat(buf, ".#");
     (void) strcat(buf, name);
     if (interactive) {
          printf("%s: remove %s? ", whoami, filename);
          if (! yes()) {
               set_status(DELETE_NOT_DELETED);
               return error_code;
          }
     }
     else if ((! force)
#ifdef S_IFLNK
              && ((stat_buf.st_mode & S_IFMT) != S_IFLNK)
#endif
              && access(filename, W_OK)) {
          if (emulate_rm)
               printf("%s: override protection %o for %s? ", whoami,
                      stat_buf.st_mode & 0777, filename);
          else
               printf("%s: File %s not writeable.  Delete anyway? ", whoami,
                      filename);
          if (! yes()) {
               set_status(DELETE_NOT_DELETED);
               return error_code;
          }
     }
     if (emulate_rm && subs_not_deleted) {
          if (! force)
               fprintf(stderr, "%s: %s not removed\n", whoami, filename);
          return 1;
     }
     if (noop) {
          fprintf(stderr, "%s: %s would be removed\n", whoami, filename);
          return 0;
     }
     if ((! lstat(buf, &deleted_buf)) && unlink_completely(buf)) {
          if (emulate_rm && (! force))
               fprintf(stderr, "%s: %s not removed\n", whoami, filename);
          error(filename);
          return error_code;
     }
     if (rename(filename, buf)) {
          if (emulate_rm && (! force))
               fprintf(stderr, "%s: %s not removed\n", whoami, filename);
          set_error(errno);
          error(filename);
          return error_code;
     }
     else {
          if (verbose)
               fprintf(stderr, "%s: %s removed\n", whoami, filename);
#ifdef HAVE_AFS
          /*
           * Normally, expunge uses the ctime to determine how long
           * ago a file was deleted (since the ctime is normally
           * updated when a file is renamed).  However, in AFS,
           * renaming a file does not change the ctime, mtime OR
           * atime, so we have to use utimes to force the change.
           * This unfortunately causes the loss of the real mtime, but
           * there's nothing we can do about that, if we want expunge
           * to be able to do the right thing.
           *
           * Don't bother checking for errors, because we can't do
           * anything about them anyway, and in any case, this isn't a
           * *really* important operation.
           */
          utimes(buf, tvp);
#endif
          return 0;
     }
}



unlink_completely(filename)
char *filename;
{
     char buf[MAXPATHLEN];
     struct stat stat_buf;
     DIR *dirp;
     struct dirent *dp;
     int status = 0;
     int retval;
     
     if (lstat(filename, &stat_buf)) {
          set_error(errno);
          error(filename);
          return error_code;
     }

     if ((stat_buf.st_mode & S_IFMT) == S_IFDIR) {
          dirp = Opendir(filename);
          if (! dirp) {
               set_error(errno);
               error(filename);
               return error_code;
          }
          
          for (dp = readdir(dirp); dp != NULL; dp = readdir(dirp)) {
               if (is_dotfile(dp->d_name))
                    continue;
               (void) strcpy(buf, append(filename, dp->d_name));
               if (! *buf) {
                    status = error_code;
                    error(filename);
                    continue;
               }
               retval = unlink_completely(buf);
               if (retval) {
                    status = retval;
                    error(filename);
               }
          }
          closedir(dirp);

          if (status)
               return status;

          retval = rmdir(filename);
          if (retval) {
               set_error(errno);
               error(filename);
               return errno;
          }
     }
     else {
          retval = unlink(filename);
          if (retval) {
               set_error(errno);
               error(filename);
               return error_code;
          }
          else
               return 0;
     }
     return 0;
}