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/* `rm' file deletion utility for GNU.
Copyright (C) 1988, 1990, 1991 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. */
/* Written by Paul Rubin, David MacKenzie, and Richard Stallman. */
#ifdef HAVE_CONFIG_H
#if defined (CONFIG_BROKETS)
/* We use <config.h> instead of "config.h" so that a compilation
using -I. -I$srcdir will use ./config.h rather than $srcdir/config.h
(which it would do because it found this file in $srcdir). */
#include <config.h>
#else
#include "config.h"
#endif
#endif
#include <stdio.h>
#include <getopt.h>
#include <sys/types.h>
#include "system.h"
#include "version.h"
#ifdef _POSIX_SOURCE
/* POSIX.1 doesn't have inodes, so fake them to avoid lots of ifdefs. */
#define ino_t unsigned long
#define D_INO(dp) 1
#else
#define D_INO(dp) ((dp)->d_ino)
#endif
char *basename ();
char *stpcpy ();
char *xmalloc ();
char *xrealloc ();
int eaccess_stat ();
int yesno ();
void error ();
void strip_trailing_slashes ();
static int clear_directory ();
static int duplicate_entry ();
static int remove_dir ();
static int remove_file ();
static int rm ();
static void usage ();
/* Name this program was run with. */
char *program_name;
/* Path of file now being processed; extended as necessary. */
static char *pathname;
/* Number of bytes currently allocated for `pathname';
made larger when necessary, but never smaller. */
static int pnsize;
/* If nonzero, display the name of each file removed. */
static int verbose;
/* If nonzero, ignore nonexistant files. */
static int ignore_missing_files;
/* If nonzero, recursively remove directories. */
static int recursive;
/* If nonzero, query the user about whether to remove each file. */
static int interactive;
/* If nonzero, remove directories with unlink instead of rmdir, and don't
require a directory to be empty before trying to unlink it.
Only works for the super-user. */
static int unlink_dirs;
/* If nonzero, stdin is a tty. */
static int stdin_tty;
/* If non-zero, display usage information and exit. */
static int show_help;
/* If non-zero, print the version on standard output and exit. */
static int show_version;
static struct option const long_opts[] =
{
{"directory", no_argument, &unlink_dirs, 1},
{"force", no_argument, NULL, 'f'},
{"interactive", no_argument, NULL, 'i'},
{"recursive", no_argument, &recursive, 1},
{"verbose", no_argument, &verbose, 1},
{"help", no_argument, &show_help, 1},
{"version", no_argument, &show_version, 1},
{NULL, 0, NULL, 0}
};
void
main (argc, argv)
int argc;
char **argv;
{
int err = 0;
int c;
verbose = ignore_missing_files = recursive = interactive
= unlink_dirs = 0;
pnsize = 256;
pathname = xmalloc (pnsize);
program_name = argv[0];
while ((c = getopt_long (argc, argv, "dfirvR", long_opts, (int *) 0)) != EOF)
{
switch (c)
{
case 0: /* Long option. */
break;
case 'd':
unlink_dirs = 1;
break;
case 'f':
interactive = 0;
ignore_missing_files = 1;
break;
case 'i':
interactive = 1;
ignore_missing_files = 0;
break;
case 'r':
case 'R':
recursive = 1;
break;
case 'v':
verbose = 1;
break;
default:
usage (1);
}
}
if (show_version)
{
printf ("%s\n", version_string);
exit (0);
}
if (show_help)
usage (0);
if (optind == argc)
{
if (ignore_missing_files)
exit (0);
else
usage (1);
}
stdin_tty = isatty (STDIN_FILENO);
for (; optind < argc; optind++)
{
int len;
/* Stripping slashes is harmless for rmdir;
if the arg is not a directory, it will fail with ENOTDIR. */
strip_trailing_slashes (argv[optind]);
len = strlen (argv[optind]);
if (len + 1 > pnsize)
{
free (pathname);
pnsize = 2 * (len + 1);
pathname = xmalloc (pnsize);
}
strcpy (pathname, argv[optind]);
err += rm ();
}
exit (err > 0);
}
/* Remove file or directory `pathname' after checking appropriate things.
Return 0 if `pathname' is removed, 1 if not. */
static int
rm ()
{
struct stat path_stats;
char *base = basename (pathname);
if (base[0] == '.' && (base[1] == '\0'
|| (base[1] == '.' && base[2] == '\0')))
{
error (0, 0, "cannot remove `.' or `..'");
return 1;
}
if (lstat (pathname, &path_stats))
{
if (errno == ENOENT && ignore_missing_files)
return 0;
error (0, errno, "%s", pathname);
return 1;
}
if (S_ISDIR (path_stats.st_mode) && !unlink_dirs)
return remove_dir (&path_stats);
else
return remove_file (&path_stats);
}
/* Query the user if appropriate, and if ok try to remove the
non-directory `pathname', which STATP contains info about.
Return 0 if `pathname' is removed, 1 if not. */
static int
remove_file (statp)
struct stat *statp;
{
if (!ignore_missing_files && (interactive || stdin_tty)
&& eaccess_stat (statp, W_OK, pathname)
#ifdef S_ISLNK
&& !S_ISLNK (statp->st_mode)
#endif
)
{
fprintf (stderr, "%s: remove %s`%s', overriding mode %04o? ",
program_name,
S_ISDIR (statp->st_mode) ? "directory " : "",
pathname,
(unsigned int) (statp->st_mode & 07777));
if (!yesno ())
return 1;
}
else if (interactive)
{
fprintf (stderr, "%s: remove %s`%s'? ", program_name,
S_ISDIR (statp->st_mode) ? "directory " : "",
pathname);
if (!yesno ())
return 1;
}
if (verbose)
printf ("%s\n", pathname);
if (unlink (pathname) && (errno != ENOENT || !ignore_missing_files))
{
error (0, errno, "%s", pathname);
return 1;
}
return 0;
}
/* If not in recursive mode, print an error message and return 1.
Otherwise, query the user if appropriate, then try to recursively
remove directory `pathname', which STATP contains info about.
Return 0 if `pathname' is removed, 1 if not. */
static int
remove_dir (statp)
struct stat *statp;
{
int err;
if (!recursive)
{
error (0, 0, "%s: is a directory", pathname);
return 1;
}
if (!ignore_missing_files && (interactive || stdin_tty)
&& eaccess_stat (statp, W_OK))
{
fprintf (stderr,
"%s: descend directory `%s', overriding mode %04o? ",
program_name, pathname,
(unsigned int) (statp->st_mode & 07777));
if (!yesno ())
return 1;
}
else if (interactive)
{
fprintf (stderr, "%s: descend directory `%s'? ",
program_name, pathname);
if (!yesno ())
return 1;
}
if (verbose)
printf ("%s\n", pathname);
err = clear_directory (statp);
if (interactive)
{
if (err)
fprintf (stderr, "%s: remove directory `%s' (might be nonempty)? ",
program_name, pathname);
else
fprintf (stderr, "%s: remove directory `%s'? ",
program_name, pathname);
if (!yesno ())
return 1;
}
if (rmdir (pathname) && (errno != ENOENT || !ignore_missing_files))
{
error (0, errno, "%s", pathname);
return 1;
}
return 0;
}
/* An element in a stack of pointers into `pathname'.
`pathp' points to where in `pathname' the terminating '\0' goes
for this level's directory name. */
struct pathstack
{
struct pathstack *next;
char *pathp;
ino_t inum;
};
/* Linked list of pathnames of directories in progress in recursive rm.
The entries actually contain pointers into `pathname'.
`pathstack' is the current deepest level. */
static struct pathstack *pathstack = NULL;
/* Read directory `pathname' and remove all of its entries,
avoiding use of chdir.
On entry, STATP points to the results of stat on `pathname'.
Return 0 for success, error count for failure.
Upon return, `pathname' will have the same contents as before,
but its address might be different; in that case, `pnsize' will
be larger, as well. */
static int
clear_directory (statp)
struct stat *statp;
{
DIR *dirp;
struct dirent *dp;
char *name_space; /* Copy of directory's filenames. */
char *namep; /* Current entry in `name_space'. */
unsigned name_size; /* Bytes allocated for `name_space'. */
int name_length; /* Length of filename in `namep' plus '\0'. */
int pathname_length; /* Length of `pathname'. */
ino_t *inode_space; /* Copy of directory's inodes. */
ino_t *inodep; /* Current entry in `inode_space'. */
unsigned n_inodes_allocated; /* There is space for this many inodes
in `inode_space'. */
int err = 0; /* Return status. */
struct pathstack pathframe; /* New top of stack. */
struct pathstack *pp; /* Temporary. */
name_size = statp->st_size;
name_space = (char *) xmalloc (name_size);
n_inodes_allocated = (statp->st_size + sizeof (ino_t) - 1) / sizeof (ino_t);
inode_space = (ino_t *) xmalloc (n_inodes_allocated * sizeof (ino_t));
do
{
namep = name_space;
inodep = inode_space;
errno = 0;
dirp = opendir (pathname);
if (dirp == NULL)
{
if (errno != ENOENT || !ignore_missing_files)
{
error (0, errno, "%s", pathname);
err = 1;
}
free (name_space);
free (inode_space);
return err;
}
while ((dp = readdir (dirp)) != NULL)
{
/* Skip "." and ".." (some NFS filesystems' directories lack them). */
if (dp->d_name[0] != '.'
|| (dp->d_name[1] != '\0'
&& (dp->d_name[1] != '.' || dp->d_name[2] != '\0')))
{
unsigned size_needed = (namep - name_space) + NLENGTH (dp) + 2;
if (size_needed > name_size)
{
char *new_name_space;
while (size_needed > name_size)
name_size += 1024;
new_name_space = xrealloc (name_space, name_size);
namep += new_name_space - name_space;
name_space = new_name_space;
}
namep = stpcpy (namep, dp->d_name) + 1;
if (inodep == inode_space + n_inodes_allocated)
{
ino_t *new_inode_space;
n_inodes_allocated += 1024;
new_inode_space = (ino_t *) xrealloc (inode_space,
n_inodes_allocated * sizeof (ino_t));
inodep += new_inode_space - inode_space;
inode_space = new_inode_space;
}
*inodep++ = D_INO (dp);
}
}
*namep = '\0';
if (CLOSEDIR (dirp))
{
error (0, errno, "%s", pathname);
err = 1;
}
pathname_length = strlen (pathname);
for (namep = name_space, inodep = inode_space; *namep != '\0';
namep += name_length, inodep++)
{
name_length = strlen (namep) + 1;
/* Satisfy GNU requirement that filenames can be arbitrarily long. */
if (pathname_length + 1 + name_length > pnsize)
{
char *new_pathname;
pnsize = (pathname_length + 1 + name_length) * 2;
new_pathname = xrealloc (pathname, pnsize);
/* Update the all the pointers in the stack to use the new area. */
for (pp = pathstack; pp != NULL; pp = pp->next)
pp->pathp += new_pathname - pathname;
pathname = new_pathname;
}
/* Add a new frame to the top of the path stack. */
pathframe.pathp = pathname + pathname_length;
pathframe.inum = *inodep;
pathframe.next = pathstack;
pathstack = &pathframe;
/* Append '/' and the filename to current pathname, take care of the
file (which could result in recursive calls), and take the filename
back off. */
*pathstack->pathp = '/';
strcpy (pathstack->pathp + 1, namep);
/* If the i-number has already appeared, there's an error. */
if (duplicate_entry (pathstack->next, pathstack->inum))
err++;
else if (rm ())
err++;
*pathstack->pathp = '\0';
pathstack = pathstack->next; /* Pop the stack. */
}
}
/* Keep trying while there are still files to remove. */
while (namep > name_space && err == 0);
free (name_space);
free (inode_space);
return err;
}
/* If STACK does not already have an entry with the same i-number as INUM,
return 0. Otherwise, ask the user whether to continue;
if yes, return 1, and if no, exit.
This assumes that no one tries to remove filesystem mount points;
doing so could cause duplication of i-numbers that would not indicate
a corrupted file system. */
static int
duplicate_entry (stack, inum)
struct pathstack *stack;
ino_t inum;
{
#ifndef _POSIX_SOURCE
struct pathstack *p;
for (p = stack; p != NULL; p = p->next)
{
if (p->inum == inum)
{
fprintf (stderr, "\
%s: WARNING: Circular directory structure.\n\
This almost certainly means that you have a corrupted file system.\n\
NOTIFY YOUR SYSTEM MANAGER.\n\
Cycle detected:\n\
%s\n\
is the same file as\n", program_name, pathname);
*p->pathp = '\0'; /* Truncate pathname. */
fprintf (stderr, "%s\n", pathname);
*p->pathp = '/'; /* Put it back. */
if (interactive)
{
fprintf (stderr, "%s: continue? ", program_name);
if (!yesno ())
exit (1);
return 1;
}
else
exit (1);
}
}
#endif
return 0;
}
static void
usage (status)
int status;
{
if (status != 0)
fprintf (stderr, "Try `%s --help' for more information.\n",
program_name);
else
{
printf ("Usage: %s [OPTION]... PATH...\n", program_name);
printf ("\
\n\
-d, --directory unlink directory, even if non-empty (super-user only)\n\
-f, --force ignore nonexistent files, never prompt\n\
-i, --interactive prompt before any removal\n\
-v, --verbose explain what is being done\n\
-r, -R, --recursive remove the contents of directories recursively\n\
--help display this help and exit\n\
--version output version information and exit\n");
}
exit (status);
}
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