/* $OpenBSD: rm.c,v 1.7 2015/11/27 17:32:16 tedu Exp $ */ /* $NetBSD: rm.c,v 1.19 1995/09/07 06:48:50 jtc Exp $ */ /*- * Copyright (c) 1990, 1993, 1994 * The Regents of the University of California. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #define MAXIMUM(a, b) (((a) > (b)) ? (a) : (b)) extern char *__progname; static int eval, stdin_ok; static int check(char *, char *, struct stat *); static void checkdot(char **); static void rm_file(char **); static void rm_tree(char **); static void __dead usage(void) { (void)fprintf(stderr, "usage: %s [-dfiPRr] file ...\n", __progname); exit(1); } /* * rm -- * This rm is different from historic rm's, but is expected to match * POSIX 1003.2 behavior. The most visible difference is that -f * has two specific effects now, ignore non-existent files and force * file removal. */ int rmmain(int argc, char *argv[]) { checkdot(argv); if (*argv) { stdin_ok = isatty(STDIN_FILENO); rm_tree(argv); } return (eval); } static void rm_tree(char **argv) { FTS *fts; FTSENT *p; int flags; /* * If the -i option is specified, the user can skip on the pre-order * visit. The fts_number field flags skipped directories. */ #define SKIPPED 1 flags = FTS_PHYSICAL; flags |= FTS_NOSTAT; if (!(fts = fts_open(argv, flags, NULL))) err(1, NULL); while ((p = fts_read(fts)) != NULL) { switch (p->fts_info) { case FTS_DNR: if (p->fts_errno != ENOENT) { warnx("%s: %s", p->fts_path, strerror(p->fts_errno)); eval = 1; } continue; case FTS_ERR: errc(1, p->fts_errno, "%s", p->fts_path); case FTS_NS: /* * FTS_NS: assume that if can't stat the file, it * can't be unlinked. */ break; case FTS_D: /* Pre-order: give user chance to skip. */ continue; case FTS_DP: /* Post-order: see if user skipped. */ if (p->fts_number == SKIPPED) continue; break; default: break; } /* * If we can't read or search the directory, may still be * able to remove it. Don't print out the un{read,search}able * message unless the remove fails. */ switch (p->fts_info) { case FTS_DP: case FTS_DNR: if (!rmdir(p->fts_accpath) || (errno == ENOENT)) continue; break; case FTS_F: case FTS_NSOK: default: if (!unlink(p->fts_accpath) || (errno == ENOENT)) continue; } warn("%s", p->fts_path); eval = 1; } if (errno) err(1, "fts_read"); fts_close(fts); } static void rm_file(char **argv) { struct stat sb; int rval; char *f; /* * Remove a file. POSIX 1003.2 states that, by default, attempting * to remove a directory is an error, so must always stat the file. */ while ((f = *argv++) != NULL) { /* Assume if can't stat the file, can't unlink it. */ if (lstat(f, &sb)) { if (errno != ENOENT) { warn("%s", f); eval = 1; } continue; } if (S_ISDIR(sb.st_mode)) { warnx("%s: is a directory", f); eval = 1; continue; } if (S_ISDIR(sb.st_mode)) rval = rmdir(f); else { rval = unlink(f); } if (rval && (errno != ENOENT)) { warn("%s", f); eval = 1; } } } static int check(char *path, char *name, struct stat *sp) { int ch, first; char modep[15]; /* * If it's not a symbolic link and it's unwritable and we're * talking to a terminal, ask. Symbolic links are excluded * because their permissions are meaningless. Check stdin_ok * first because we may not have stat'ed the file. */ if (!stdin_ok || S_ISLNK(sp->st_mode) || !access(name, W_OK) || errno != EACCES) return (1); strmode(sp->st_mode, modep); (void)fprintf(stderr, "override %s%s%s/%s for %s? ", modep + 1, modep[9] == ' ' ? "" : " ", user_from_uid(sp->st_uid, 0), group_from_gid(sp->st_gid, 0), path); (void)fflush(stderr); first = ch = getchar(); while (ch != '\n' && ch != EOF) ch = getchar(); return (first == 'y' || first == 'Y'); } /* * POSIX.2 requires that if "." or ".." are specified as the basename * portion of an operand, a diagnostic message be written to standard * error and nothing more be done with such operands. * * Since POSIX.2 defines basename as the final portion of a path after * trailing slashes have been removed, we'll remove them here. */ #define ISDOT(a) ((a)[0] == '.' && (!(a)[1] || ((a)[1] == '.' && !(a)[2]))) static void checkdot(char **argv) { char *p, **save, **t; int complained; complained = 0; for (t = argv; *t;) { /* strip trailing slashes */ p = strrchr (*t, '\0'); while (--p > *t && *p == '/') *p = '\0'; /* extract basename */ if ((p = strrchr(*t, '/')) != NULL) ++p; else p = *t; if (ISDOT(p)) { if (!complained++) warnx("\".\" and \"..\" may not be removed"); eval = 1; for (save = t; (t[0] = t[1]) != NULL; ++t) continue; t = save; } else ++t; } }