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Diffstat (limited to 'src/rm.c')
| -rw-r--r-- | src/rm.c | 373 |
1 files changed, 373 insertions, 0 deletions
diff --git a/src/rm.c b/src/rm.c new file mode 100644 index 0000000..f696142 --- /dev/null +++ b/src/rm.c @@ -0,0 +1,373 @@ +/* 'rm' file deletion utility for GNU. + Copyright (C) 1988-2018 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 3 of the License, 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, see <https://www.gnu.org/licenses/>. */ + +/* Initially written by Paul Rubin, David MacKenzie, and Richard Stallman. + Reworked to use chdir and avoid recursion, and later, rewritten + once again, to use fts, by Jim Meyering. */ + +#include <config.h> +#include <stdio.h> +#include <getopt.h> +#include <sys/types.h> +#include <assert.h> + +#include "system.h" +#include "argmatch.h" +#include "die.h" +#include "error.h" +#include "remove.h" +#include "root-dev-ino.h" +#include "yesno.h" +#include "priv-set.h" + +/* The official name of this program (e.g., no 'g' prefix). */ +#define PROGRAM_NAME "rm" + +#define AUTHORS \ + proper_name ("Paul Rubin"), \ + proper_name ("David MacKenzie"), \ + proper_name ("Richard M. Stallman"), \ + proper_name ("Jim Meyering") + +/* For long options that have no equivalent short option, use a + non-character as a pseudo short option, starting with CHAR_MAX + 1. */ +enum +{ + INTERACTIVE_OPTION = CHAR_MAX + 1, + ONE_FILE_SYSTEM, + NO_PRESERVE_ROOT, + PRESERVE_ROOT, + PRESUME_INPUT_TTY_OPTION +}; + +enum interactive_type + { + interactive_never, /* 0: no option or --interactive=never */ + interactive_once, /* 1: -I or --interactive=once */ + interactive_always /* 2: default, -i or --interactive=always */ + }; + +static struct option const long_opts[] = +{ + {"force", no_argument, NULL, 'f'}, + {"interactive", optional_argument, NULL, INTERACTIVE_OPTION}, + + {"one-file-system", no_argument, NULL, ONE_FILE_SYSTEM}, + {"no-preserve-root", no_argument, NULL, NO_PRESERVE_ROOT}, + {"preserve-root", optional_argument, NULL, PRESERVE_ROOT}, + + /* This is solely for testing. Do not document. */ + /* It is relatively difficult to ensure that there is a tty on stdin. + Since rm acts differently depending on that, without this option, + it'd be harder to test the parts of rm that depend on that setting. */ + {"-presume-input-tty", no_argument, NULL, PRESUME_INPUT_TTY_OPTION}, + + {"recursive", no_argument, NULL, 'r'}, + {"dir", no_argument, NULL, 'd'}, + {"verbose", no_argument, NULL, 'v'}, + {GETOPT_HELP_OPTION_DECL}, + {GETOPT_VERSION_OPTION_DECL}, + {NULL, 0, NULL, 0} +}; + +static char const *const interactive_args[] = +{ + "never", "no", "none", + "once", + "always", "yes", NULL +}; +static enum interactive_type const interactive_types[] = +{ + interactive_never, interactive_never, interactive_never, + interactive_once, + interactive_always, interactive_always +}; +ARGMATCH_VERIFY (interactive_args, interactive_types); + +/* Advise the user about invalid usages like "rm -foo" if the file + "-foo" exists, assuming ARGC and ARGV are as with 'main'. */ + +static void +diagnose_leading_hyphen (int argc, char **argv) +{ + /* OPTIND is unreliable, so iterate through the arguments looking + for a file name that looks like an option. */ + + for (int i = 1; i < argc; i++) + { + char const *arg = argv[i]; + struct stat st; + + if (arg[0] == '-' && arg[1] && lstat (arg, &st) == 0) + { + fprintf (stderr, + _("Try '%s ./%s' to remove the file %s.\n"), + argv[0], + quotearg_n_style (1, shell_escape_quoting_style, arg), + quoteaf (arg)); + break; + } + } +} + +void +usage (int status) +{ + if (status != EXIT_SUCCESS) + emit_try_help (); + else + { + printf (_("Usage: %s [OPTION]... [FILE]...\n"), program_name); + fputs (_("\ +Remove (unlink) the FILE(s).\n\ +\n\ + -f, --force ignore nonexistent files and arguments, never prompt\n\ + -i prompt before every removal\n\ +"), stdout); + fputs (_("\ + -I prompt once before removing more than three files, or\n\ + when removing recursively; less intrusive than -i,\n\ + while still giving protection against most mistakes\n\ + --interactive[=WHEN] prompt according to WHEN: never, once (-I), or\n\ + always (-i); without WHEN, prompt always\n\ +"), stdout); + fputs (_("\ + --one-file-system when removing a hierarchy recursively, skip any\n\ + directory that is on a file system different from\n\ + that of the corresponding command line argument\n\ +"), stdout); + fputs (_("\ + --no-preserve-root do not treat '/' specially\n\ + --preserve-root[=all] do not remove '/' (default);\n\ + with 'all', reject any command line argument\n\ + on a separate device from its parent\n\ +"), stdout); + fputs (_("\ + -r, -R, --recursive remove directories and their contents recursively\n\ + -d, --dir remove empty directories\n\ + -v, --verbose explain what is being done\n\ +"), stdout); + fputs (HELP_OPTION_DESCRIPTION, stdout); + fputs (VERSION_OPTION_DESCRIPTION, stdout); + fputs (_("\ +\n\ +By default, rm does not remove directories. Use the --recursive (-r or -R)\n\ +option to remove each listed directory, too, along with all of its contents.\n\ +"), stdout); + printf (_("\ +\n\ +To remove a file whose name starts with a '-', for example '-foo',\n\ +use one of these commands:\n\ + %s -- -foo\n\ +\n\ + %s ./-foo\n\ +"), + program_name, program_name); + fputs (_("\ +\n\ +Note that if you use rm to remove a file, it might be possible to recover\n\ +some of its contents, given sufficient expertise and/or time. For greater\n\ +assurance that the contents are truly unrecoverable, consider using shred.\n\ +"), stdout); + emit_ancillary_info (PROGRAM_NAME); + } + exit (status); +} + +static void +rm_option_init (struct rm_options *x) +{ + x->ignore_missing_files = false; + x->interactive = RMI_SOMETIMES; + x->one_file_system = false; + x->remove_empty_directories = false; + x->recursive = false; + x->root_dev_ino = NULL; + x->preserve_all_root = false; + x->stdin_tty = isatty (STDIN_FILENO); + x->verbose = false; + + /* Since this program exits immediately after calling 'rm', rm need not + expend unnecessary effort to preserve the initial working directory. */ + x->require_restore_cwd = false; +} + +int +main (int argc, char **argv) +{ + bool preserve_root = true; + struct rm_options x; + bool prompt_once = false; + int c; + + initialize_main (&argc, &argv); + set_program_name (argv[0]); + setlocale (LC_ALL, ""); + bindtextdomain (PACKAGE, LOCALEDIR); + textdomain (PACKAGE); + + atexit (close_stdin); + + rm_option_init (&x); + + /* Try to disable the ability to unlink a directory. */ + priv_set_remove_linkdir (); + + while ((c = getopt_long (argc, argv, "dfirvIR", long_opts, NULL)) != -1) + { + switch (c) + { + case 'd': + x.remove_empty_directories = true; + break; + + case 'f': + x.interactive = RMI_NEVER; + x.ignore_missing_files = true; + prompt_once = false; + break; + + case 'i': + x.interactive = RMI_ALWAYS; + x.ignore_missing_files = false; + prompt_once = false; + break; + + case 'I': + x.interactive = RMI_SOMETIMES; + x.ignore_missing_files = false; + prompt_once = true; + break; + + case 'r': + case 'R': + x.recursive = true; + break; + + case INTERACTIVE_OPTION: + { + int i; + if (optarg) + i = XARGMATCH ("--interactive", optarg, interactive_args, + interactive_types); + else + i = interactive_always; + switch (i) + { + case interactive_never: + x.interactive = RMI_NEVER; + prompt_once = false; + break; + + case interactive_once: + x.interactive = RMI_SOMETIMES; + x.ignore_missing_files = false; + prompt_once = true; + break; + + case interactive_always: + x.interactive = RMI_ALWAYS; + x.ignore_missing_files = false; + prompt_once = false; + break; + } + break; + } + + case ONE_FILE_SYSTEM: + x.one_file_system = true; + break; + + case NO_PRESERVE_ROOT: + if (! STREQ (argv[optind - 1], "--no-preserve-root")) + die (EXIT_FAILURE, 0, + _("you may not abbreviate the --no-preserve-root option")); + preserve_root = false; + break; + + case PRESERVE_ROOT: + if (optarg) + { + if STREQ (optarg, "all") + x.preserve_all_root = true; + else + { + die (EXIT_FAILURE, 0, + _("unrecognized --preserve-root argument: %s"), + quoteaf (optarg)); + } + } + preserve_root = true; + break; + + case PRESUME_INPUT_TTY_OPTION: + x.stdin_tty = true; + break; + + case 'v': + x.verbose = true; + break; + + case_GETOPT_HELP_CHAR; + case_GETOPT_VERSION_CHAR (PROGRAM_NAME, AUTHORS); + default: + diagnose_leading_hyphen (argc, argv); + usage (EXIT_FAILURE); + } + } + + if (argc <= optind) + { + if (x.ignore_missing_files) + return EXIT_SUCCESS; + else + { + error (0, 0, _("missing operand")); + usage (EXIT_FAILURE); + } + } + + if (x.recursive && preserve_root) + { + static struct dev_ino dev_ino_buf; + x.root_dev_ino = get_root_dev_ino (&dev_ino_buf); + if (x.root_dev_ino == NULL) + die (EXIT_FAILURE, errno, _("failed to get attributes of %s"), + quoteaf ("/")); + } + + uintmax_t n_files = argc - optind; + char **file = argv + optind; + + if (prompt_once && (x.recursive || 3 < n_files)) + { + fprintf (stderr, + (x.recursive + ? ngettext ("%s: remove %"PRIuMAX" argument recursively? ", + "%s: remove %"PRIuMAX" arguments recursively? ", + select_plural (n_files)) + : ngettext ("%s: remove %"PRIuMAX" argument? ", + "%s: remove %"PRIuMAX" arguments? ", + select_plural (n_files))), + program_name, n_files); + if (!yesno ()) + return EXIT_SUCCESS; + } + + enum RM_status status = rm (file, &x); + assert (VALID_STATUS (status)); + return status == RM_ERROR ? EXIT_FAILURE : EXIT_SUCCESS; +} |