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Diffstat (limited to 'package/toolbox/src/cp/cp.c')
| -rw-r--r-- | package/toolbox/src/cp/cp.c | 549 |
1 files changed, 549 insertions, 0 deletions
diff --git a/package/toolbox/src/cp/cp.c b/package/toolbox/src/cp/cp.c new file mode 100644 index 000000000..d04702f2a --- /dev/null +++ b/package/toolbox/src/cp/cp.c @@ -0,0 +1,549 @@ +/* $NetBSD: cp.c,v 1.58 2012/01/04 15:58:37 christos 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 <sys/cdefs.h> +#ifndef lint +__COPYRIGHT( +"@(#) Copyright (c) 1988, 1993, 1994\ + The Regents of the University of California. All rights reserved."); +#endif /* not lint */ + +#ifndef lint +#if 0 +static char sccsid[] = "@(#)cp.c 8.5 (Berkeley) 4/29/95"; +#else +__RCSID("$NetBSD: cp.c,v 1.58 2012/01/04 15:58:37 christos 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 <sys/param.h> +#include <sys/stat.h> + +#include <assert.h> +#include <err.h> +#include <errno.h> +#include <fts.h> +#include <locale.h> +#include <signal.h> +#include <stdlib.h> +#include <stdio.h> +#include <string.h> +#include <unistd.h> + +#include "extern.h" + +#define STRIP_TRAILING_SLASH(p) { \ + while ((p).p_end > (p).p_path + 1 && (p).p_end[-1] == '/') \ + *--(p).p_end = '\0'; \ +} + +static char empty[] = ""; +PATH_T to = { .p_end = to.p_path, .target_end = empty }; + +uid_t myuid; +int Hflag, Lflag, Rflag, Pflag, fflag, iflag, lflag, pflag, rflag, vflag, Nflag; +mode_t myumask; +sig_atomic_t pinfo; + +enum op { FILE_TO_FILE, FILE_TO_DIR, DIR_TO_DNE }; + +static int copy(char *[], enum op, int); + +#ifdef SIGINFO +static void +progress(int sig __unused) +{ + + pinfo++; +} +#endif + +int +main(int argc, char *argv[]) +{ + struct stat to_stat, tmp_stat; + enum op type; + int ch, fts_options, r, have_trailing_slash; + char *target, **src; + + Hflag = Lflag = Pflag = Rflag = 0; + while ((ch = getopt(argc, argv, "HLNPRfailprv")) != -1) + switch (ch) { + case 'H': + Hflag = 1; + Lflag = Pflag = 0; + break; + case 'L': + Lflag = 1; + Hflag = Pflag = 0; + break; + case 'N': + Nflag = 1; + break; + case 'P': + Pflag = 1; + Hflag = Lflag = 0; + break; + case 'R': + Rflag = 1; + break; + case 'a': + Pflag = 1; + pflag = 1; + Rflag = 1; + Hflag = Lflag = 0; + break; + case 'f': + fflag = 1; + iflag = 0; + break; + case 'i': + iflag = isatty(fileno(stdin)); + fflag = 0; + break; + case 'l': + lflag = 1; + break; + case 'p': + pflag = 1; + break; + case 'r': + rflag = 1; + break; + case 'v': + vflag = 1; + break; + case '?': + default: + cp_usage(); + /* NOTREACHED */ + } + argc -= optind; + argv += optind; + + if (argc < 2) + cp_usage(); + + 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 if (!Pflag) { + 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 (strlcpy(to.p_path, target, sizeof(to.p_path)) >= sizeof(to.p_path)) + errx(EXIT_FAILURE, "%s: name too long", target); + to.p_end = to.p_path + strlen(to.p_path); + have_trailing_slash = (to.p_end[-1] == '/'); + if (have_trailing_slash) + STRIP_TRAILING_SLASH(to); + to.target_end = to.p_end; + + /* Set end of argument list for fts(3). */ + argv[argc] = NULL; + +#ifdef SIGINFO + (void)signal(SIGINFO, progress); +#endif + + /* + * 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". + */ + if (Pflag) + r = lstat(to.p_path, &to_stat); + else + r = stat(to.p_path, &to_stat); + if (r == -1 && errno != ENOENT) { + err(EXIT_FAILURE, "%s", to.p_path); + /* NOTREACHED */ + } + if (r == -1 || !S_ISDIR(to_stat.st_mode)) { + /* + * Case (1). Target is not a directory. + */ + if (argc > 1) + cp_usage(); + /* + * 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", *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; + + if (have_trailing_slash && type == FILE_TO_FILE) { + if (r == -1) + errx(1, "directory %s does not exist", + to.p_path); + else + errx(1, "%s is not a directory", to.p_path); + } + } else { + /* + * Case (2). Target is a directory. + */ + type = FILE_TO_DIR; + } + + /* + * make "cp -rp src/ dst" behave like "cp -rp src dst" not + * like "cp -rp src/. dst" + */ + for (src = argv; *src; src++) { + size_t len = strlen(*src); + while (len-- > 1 && (*src)[len] == '/') + (*src)[len] = '\0'; + } + + exit(copy(argv, type, fts_options)); + /* NOTREACHED */ +} + +static int dnestack[MAXPATHLEN]; /* unlikely we'll have more nested dirs */ +static ssize_t dnesp; +static void +pushdne(int dne) +{ + + dnestack[dnesp++] = dne; + assert(dnesp < MAXPATHLEN); +} + +static int +popdne(void) +{ + int rv; + + rv = dnestack[--dnesp]; + assert(dnesp >= 0); + return rv; +} + +static int +copy(char *argv[], enum op type, int fts_options) +{ + struct stat to_stat; + FTS *ftsp; + FTSENT *curr; + int base, dne, sval; + int this_failed, any_failed; + size_t nlen; + char *p, *target_mid; + + base = 0; /* XXX gcc -Wuninitialized (see comment below) */ + + if ((ftsp = fts_open(argv, fts_options, NULL)) == NULL) + err(EXIT_FAILURE, "%s", argv[0]); + /* NOTREACHED */ + for (any_failed = 0; (curr = fts_read(ftsp)) != NULL;) { + this_failed = 0; + switch (curr->fts_info) { + case FTS_NS: + case FTS_DNR: + case FTS_ERR: + warnx("%s: %s", curr->fts_path, + strerror(curr->fts_errno)); + this_failed = any_failed = 1; + continue; + case FTS_DC: /* Warn, continue. */ + warnx("%s: directory causes a cycle", curr->fts_path); + this_failed = any_failed = 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) { + warnx("%s/%s: name too long (not copied)", + to.p_path, curr->fts_name); + this_failed = any_failed = 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; + target_mid = to.target_end; + if (*p != '/' && target_mid[-1] != '/') + *target_mid++ = '/'; + *target_mid = 0; + + if (target_mid - to.p_path + nlen >= PATH_MAX) { + warnx("%s%s: name too long (not copied)", + to.p_path, p); + this_failed = any_failed = 1; + continue; + } + (void)strncat(target_mid, p, nlen); + to.p_end = target_mid + nlen; + *to.p_end = 0; + STRIP_TRAILING_SLASH(to); + } + + sval = Pflag ? lstat(to.p_path, &to_stat) : stat(to.p_path, &to_stat); + /* Not an error but need to remember it happened */ + if (sval == -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); + this_failed = any_failed = 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)) { + warnx("cannot overwrite directory %s with non-directory %s", + to.p_path, curr->fts_path); + this_failed = any_failed = 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)) + this_failed = any_failed = 1; + } else { + if (copy_link(curr, !dne)) + this_failed = any_failed = 1; + } + break; + case S_IFDIR: + if (!Rflag && !rflag) { + if (curr->fts_info == FTS_D) + warnx("%s is a directory (not copied).", + curr->fts_path); + (void)fts_set(ftsp, curr, FTS_SKIP); + this_failed = any_failed = 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.. + */ + pushdne(dne); + if (dne) { + if (mkdir(to.p_path, + curr->fts_statp->st_mode | S_IRWXU) < 0) + err(EXIT_FAILURE, "%s", + to.p_path); + /* NOTREACHED */ + } else if (!S_ISDIR(to_stat.st_mode)) { + errno = ENOTDIR; + err(EXIT_FAILURE, "%s", + 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)) + this_failed = any_failed = 1; + else if ((dne = popdne())) + (void)chmod(to.p_path, + curr->fts_statp->st_mode); + } + else + { + warnx("directory %s encountered when not expected.", + curr->fts_path); + this_failed = any_failed = 1; + break; + } + + break; + case S_IFBLK: + case S_IFCHR: + if (Rflag) { + if (copy_special(curr->fts_statp, !dne)) + this_failed = any_failed = 1; + } else + if (copy_file(curr, dne)) + this_failed = any_failed = 1; + break; + case S_IFIFO: + if (Rflag) { + if (copy_fifo(curr->fts_statp, !dne)) + this_failed = any_failed = 1; + } else + if (copy_file(curr, dne)) + this_failed = any_failed = 1; + break; + default: + if (copy_file(curr, dne)) + this_failed = any_failed = 1; + break; + } + if (vflag && !this_failed) + (void)printf("%s -> %s\n", curr->fts_path, to.p_path); + } + if (errno) { + err(EXIT_FAILURE, "fts_read"); + /* NOTREACHED */ + } + (void)fts_close(ftsp); + return (any_failed); +} |