/* $NetBSD: cp.c,v 1.34 2003/08/07 09:05:03 agc Exp $ */ /* * Copyright (c) 1988, 1993, 1994 * The Regents of the University of California. All rights reserved. * * This code is derived from software contributed to Berkeley by * David Hitz of Auspex Systems Inc. * * 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 #ifndef lint __COPYRIGHT( "@(#) Copyright (c) 1988, 1993, 1994\n\ The Regents of the University of California. All rights reserved.\n"); #endif /* not lint */ #ifndef lint #if 0 static char sccsid[] = "@(#)cp.c 8.5 (Berkeley) 4/29/95"; #else __RCSID("$NetBSD: cp.c,v 1.34 2003/08/07 09:05:03 agc Exp $"); #endif #endif /* not lint */ /* * Cp copies source files to target files. * * The global PATH_T structure "to" always contains the path to the * current target file. Since fts(3) does not change directories, * this path can be either absolute or dot-relative. * * The basic algorithm is to initialize "to" and use fts(3) to traverse * the file hierarchy rooted in the argument list. A trivial case is the * case of 'cp file1 file2'. The more interesting case is the case of * 'cp file1 file2 ... fileN dir' where the hierarchy is traversed and the * path (relative to the root of the traversal) is appended to dir (stored * in "to") to form the final target path. */ #include #include #include #include #include #include #include #include #include #include #include "extern.h" #define STRIP_TRAILING_SLASH(p) { \ while ((p).p_end > (p).p_path + 1 && (p).p_end[-1] == '/') \ *--(p).p_end = '\0'; \ } PATH_T to = { to.p_path, "" }; uid_t myuid; int Rflag, fflag, iflag, pflag, rflag, stdout_ok, vflag; mode_t myumask; enum op { FILE_TO_FILE, FILE_TO_DIR, DIR_TO_DNE }; int main(int, char *[]); int copy(char *[], enum op, int); int mastercmp(const FTSENT **, const FTSENT **); int main(int argc, char *argv[]) { struct stat to_stat, tmp_stat; enum op type; int Hflag, Lflag, Pflag, ch, fts_options, r; char *target; (void)setlocale(LC_ALL, ""); Hflag = Lflag = Pflag = Rflag = 0; while ((ch = getopt(argc, argv, "HLPRfiprv")) != -1) switch (ch) { case 'H': Hflag = 1; Lflag = Pflag = 0; break; case 'L': Lflag = 1; Hflag = Pflag = 0; break; case 'P': Pflag = 1; Hflag = Lflag = 0; break; case 'R': Rflag = 1; break; case 'f': fflag = 1; iflag = 0; break; case 'i': iflag = isatty(fileno(stdin)); fflag = 0; break; case 'p': pflag = 1; break; case 'r': rflag = 1; break; case 'v': vflag = 1; break; case '?': default: usage(); break; } argc -= optind; argv += optind; if (argc < 2) usage(); stdout_ok = isatty(STDOUT_FILENO); fts_options = FTS_NOCHDIR | FTS_PHYSICAL; if (rflag) { if (Rflag) { errx(EXIT_FAILURE, "the -R and -r options may not be specified together."); /* NOTREACHED */ } if (Hflag || Lflag || Pflag) { errx(EXIT_FAILURE, "the -H, -L, and -P options may not be specified with the -r option."); /* NOTREACHED */ } fts_options &= ~FTS_PHYSICAL; fts_options |= FTS_LOGICAL; } if (Rflag) { if (Hflag) fts_options |= FTS_COMFOLLOW; if (Lflag) { fts_options &= ~FTS_PHYSICAL; fts_options |= FTS_LOGICAL; } } else { fts_options &= ~FTS_PHYSICAL; fts_options |= FTS_LOGICAL | FTS_COMFOLLOW; } myuid = getuid(); /* Copy the umask for explicit mode setting. */ myumask = umask(0); (void)umask(myumask); /* Save the target base in "to". */ target = argv[--argc]; if (strlen(target) > MAXPATHLEN) { errx(EXIT_FAILURE, "%s: name too long", printescaped(target)); /* NOTREACHED */ } (void)strcpy(to.p_path, target); to.p_end = to.p_path + strlen(to.p_path); if (to.p_path == to.p_end) { *to.p_end++ = '.'; *to.p_end = 0; } STRIP_TRAILING_SLASH(to); to.target_end = to.p_end; /* Set end of argument list for fts(3). */ argv[argc] = NULL; /* * Cp has two distinct cases: * * cp [-R] source target * cp [-R] source1 ... sourceN directory * * In both cases, source can be either a file or a directory. * * In (1), the target becomes a copy of the source. That is, if the * source is a file, the target will be a file, and likewise for * directories. * * In (2), the real target is not directory, but "directory/source". */ r = stat(to.p_path, &to_stat); if (r == -1 && errno != ENOENT) { err(EXIT_FAILURE, "%s", printescaped(to.p_path)); /* NOTREACHED */ } if (r == -1 || !S_ISDIR(to_stat.st_mode)) { /* * Case (1). Target is not a directory. */ if (argc > 1) { usage(); exit(1); } /* * Need to detect the case: * cp -R dir foo * Where dir is a directory and foo does not exist, where * we want pathname concatenations turned on but not for * the initial mkdir(). */ if (r == -1) { if (rflag || (Rflag && (Lflag || Hflag))) r = stat(*argv, &tmp_stat); else r = lstat(*argv, &tmp_stat); if (r == -1) { err(EXIT_FAILURE, "%s", printescaped(*argv)); /* NOTREACHED */ } if (S_ISDIR(tmp_stat.st_mode) && (Rflag || rflag)) type = DIR_TO_DNE; else type = FILE_TO_FILE; } else type = FILE_TO_FILE; } else { /* * Case (2). Target is a directory. */ type = FILE_TO_DIR; } exit(copy(argv, type, fts_options)); /* NOTREACHED */ } int copy(char *argv[], enum op type, int fts_options) { struct stat to_stat; FTS *ftsp; FTSENT *curr; int base, dne, nlen, rval; char *p, *tmp, *fn; base = 0; /* XXX gcc -Wuninitialized (see comment below) */ if ((ftsp = fts_open(argv, fts_options, mastercmp)) == NULL) err(EXIT_FAILURE, "%s", printescaped(argv[0])); /* NOTREACHED */ for (rval = 0; (curr = fts_read(ftsp)) != NULL;) { switch (curr->fts_info) { case FTS_NS: case FTS_DNR: case FTS_ERR: fn = printescaped(curr->fts_path); warnx("%s: %s", fn, strerror(curr->fts_errno)); free(fn); rval = 1; continue; case FTS_DC: /* Warn, continue. */ fn = printescaped(curr->fts_path); warnx("%s: directory causes a cycle", fn); free(fn); rval = 1; continue; } /* * If we are in case (2) or (3) above, we need to append the * source name to the target name. */ if (type != FILE_TO_FILE) { if ((curr->fts_namelen + to.target_end - to.p_path + 1) > MAXPATHLEN) { char *tn; tn = printescaped(to.p_path); fn = printescaped(curr->fts_name); warnx("%s/%s: name too long (not copied)", tn, fn); free(fn); free(tn); rval = 1; continue; } /* * Need to remember the roots of traversals to create * correct pathnames. If there's a directory being * copied to a non-existent directory, e.g. * cp -R a/dir noexist * the resulting path name should be noexist/foo, not * noexist/dir/foo (where foo is a file in dir), which * is the case where the target exists. * * Also, check for "..". This is for correct path * concatentation for paths ending in "..", e.g. * cp -R .. /tmp * Paths ending in ".." are changed to ".". This is * tricky, but seems the easiest way to fix the problem. * * XXX * Since the first level MUST be FTS_ROOTLEVEL, base * is always initialized. */ if (curr->fts_level == FTS_ROOTLEVEL) { if (type != DIR_TO_DNE) { p = strrchr(curr->fts_path, '/'); base = (p == NULL) ? 0 : (int)(p - curr->fts_path + 1); if (!strcmp(&curr->fts_path[base], "..")) base += 1; } else base = curr->fts_pathlen; } p = &curr->fts_path[base]; nlen = curr->fts_pathlen - base; tmp = to.target_end; if (*p != '/' && *(tmp - 1) != '/') *tmp++ = '/'; *tmp = 0; (void)strncat(tmp, p, nlen); to.p_end = tmp + nlen; *to.p_end = 0; STRIP_TRAILING_SLASH(to); } /* Not an error but need to remember it happened */ if (stat(to.p_path, &to_stat) == -1) dne = 1; else { if (to_stat.st_dev == curr->fts_statp->st_dev && to_stat.st_ino == curr->fts_statp->st_ino) { warnx("%s and %s are identical (not copied).", to.p_path, curr->fts_path); rval = 1; if (S_ISDIR(curr->fts_statp->st_mode)) (void)fts_set(ftsp, curr, FTS_SKIP); continue; } if (!S_ISDIR(curr->fts_statp->st_mode) && S_ISDIR(to_stat.st_mode)) { char *tn; tn = printescaped(to.p_path); fn = printescaped(curr->fts_path); warnx("cannot overwrite directory %s with non-directory %s", tn, fn); free(tn); free(fn); rval = 1; continue; } dne = 0; } switch (curr->fts_statp->st_mode & S_IFMT) { case S_IFLNK: /* Catch special case of a non dangling symlink */ if((fts_options & FTS_LOGICAL) || ((fts_options & FTS_COMFOLLOW) && curr->fts_level == 0)) { if (copy_file(curr, dne)) rval = 1; } else { if (copy_link(curr, !dne)) rval = 1; } break; case S_IFDIR: if (!Rflag && !rflag) { if (curr->fts_info == FTS_D) { fn = printescaped(curr->fts_path); warnx("%s is a directory (not copied).", fn); free(fn); } (void)fts_set(ftsp, curr, FTS_SKIP); rval = 1; break; } /* * Directories get noticed twice: * In the first pass, create it if needed. * In the second pass, after the children have been copied, set the permissions. */ if (curr->fts_info == FTS_D) /* First pass */ { /* * If the directory doesn't exist, create the new * one with the from file mode plus owner RWX bits, * modified by the umask. Trade-off between being * able to write the directory (if from directory is * 555) and not causing a permissions race. If the * umask blocks owner writes, we fail.. */ if (dne) { if (mkdir(to.p_path, curr->fts_statp->st_mode | S_IRWXU) < 0) err(EXIT_FAILURE, "%s", printescaped(to.p_path)); /* NOTREACHED */ } else if (!S_ISDIR(to_stat.st_mode)) { errno = ENOTDIR; err(EXIT_FAILURE, "%s", printescaped(to.p_path)); /* NOTREACHED */ } } else if (curr->fts_info == FTS_DP) /* Second pass */ { /* * If not -p and directory didn't exist, set it to be * the same as the from directory, umodified by the * umask; arguably wrong, but it's been that way * forever. */ if (pflag && setfile(curr->fts_statp, 0)) rval = 1; else if (dne) (void)chmod(to.p_path, curr->fts_statp->st_mode); } else { fn = printescaped(curr->fts_path); warnx("directory %s encountered when not expected.", fn); free(fn); rval = 1; break; } break; case S_IFBLK: case S_IFCHR: if (Rflag) { if (copy_special(curr->fts_statp, !dne)) rval = 1; } else if (copy_file(curr, dne)) rval = 1; break; case S_IFIFO: if (Rflag) { if (copy_fifo(curr->fts_statp, !dne)) rval = 1; } else if (copy_file(curr, dne)) rval = 1; break; default: if (copy_file(curr, dne)) rval = 1; break; } if (vflag) { char *tn; fn = printescaped(curr->fts_path); tn = printescaped(to.p_path); (void)printf("%s -> %s\n", fn, tn); free(fn); free(tn); } } if (errno) { err(EXIT_FAILURE, "fts_read"); /* NOTREACHED */ } return (rval); } /* * mastercmp -- * The comparison function for the copy order. The order is to copy * non-directory files before directory files. The reason for this * is because files tend to be in the same cylinder group as their * parent directory, whereas directories tend not to be. Copying the * files first reduces seeking. */ int mastercmp(const FTSENT **a, const FTSENT **b) { int a_info, b_info; a_info = (*a)->fts_info; if (a_info == FTS_ERR || a_info == FTS_NS || a_info == FTS_DNR) return (0); b_info = (*b)->fts_info; if (b_info == FTS_ERR || b_info == FTS_NS || b_info == FTS_DNR) return (0); if (a_info == FTS_D) return (-1); if (b_info == FTS_D) return (1); return (0); }