4.4BSD/usr/src/bin/cp/cp.c
/*
* Copyright (c) 1988, 1993
* 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. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. 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.
*/
#ifndef lint
static char copyright[] =
"@(#) Copyright (c) 1988, 1993\n\
The Regents of the University of California. All rights reserved.\n";
#endif /* not lint */
#ifndef lint
static char sccsid[] = "@(#)cp.c 8.1 (Berkeley) 5/31/93";
#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-realative.
*
* 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 <sys/mman.h>
#include <sys/time.h>
#include <dirent.h>
#include <fcntl.h>
#include <errno.h>
#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <fts.h>
#include "extern.h"
#define STRIP_TRAILING_SLASH(p) { \
while ((p).p_end > (p).p_path && (p).p_end[-1] == '/') \
*--(p).p_end = 0; \
}
static void copy __P((FTS *));
static int mastercmp __P((const FTSENT **, const FTSENT **));
PATH_T to = { to.p_path, "" };
uid_t myuid;
int exit_val, myumask;
int iflag, orflag, pflag, rflag;
char *progname;
static enum { FILE_TO_FILE, FILE_TO_DIR, DIR_TO_DNE } type;
int
main(argc, argv)
int argc;
char *argv[];
{
struct stat to_stat, tmp_stat;
FTS *ftsp;
register int c, r;
int fts_options, Hflag, hflag;
char *p, *target;
/*
* The utility cp(1) is used by mv(1) -- except for usage statements,
* print the "called as" program name.
*/
progname = (p = rindex(*argv,'/')) ? ++p : *argv;
/*
* Symbolic link handling is as follows:
* 1. Follow all symbolic links on the argument line.
* 2. Otherwise, don't follow symbolic links UNLESS options -h
* (in conjuction with -R) or -r (for backward compatibility) are
* set, in which case follow all symbolic links, or when the -H
* option is set (in conjuction with -R), in which case follow
* all symbolic links on the command line.
*
*/
Hflag = hflag = 0;
fts_options = FTS_NOCHDIR | FTS_LOGICAL;
while ((c = getopt(argc, argv, "HRfhipr")) != EOF)
switch ((char)c) {
case 'H':
Hflag = 1;
fts_options |= FTS_COMFOLLOW;
break;
case 'f':
iflag = 0;
break;
case 'h':
hflag = 1;
break;
case 'i':
iflag = isatty(fileno(stdin));
break;
case 'p':
pflag = 1;
break;
case 'R':
fts_options &= ~FTS_LOGICAL;
fts_options |= FTS_PHYSICAL;
rflag = 1;
break;
case 'r':
orflag = 1;
fts_options &= ~FTS_PHYSICAL;
fts_options |= FTS_LOGICAL;
break;
case '?':
default:
usage();
break;
}
argc -= optind;
argv += optind;
if (argc < 2)
usage();
if (orflag) {
if (rflag) {
(void)fprintf(stderr,
"cp: the -R and -r options are mutually exclusive.\n");
exit(1);
}
if (Hflag || hflag) {
(void)fprintf(stderr,
"cp: the -r and the -H and -h options are mutually exclusive.\n");
exit(1);
}
}
if (hflag) {
fts_options &= ~FTS_PHYSICAL;
fts_options |= FTS_LOGICAL;
}
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) {
err("%s: name too long", target);
exit(1);
}
(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("%s: %s", to.p_path, strerror(errno));
exit(1);
}
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 (orflag || (rflag && (hflag || Hflag)))
stat(*argv, &tmp_stat);
else
lstat(*argv, &tmp_stat);
if (S_ISDIR(tmp_stat.st_mode) && (rflag || orflag))
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;
if ((ftsp = fts_open(argv, fts_options, mastercmp)) == NULL) {
err("%s", strerror(errno));
exit(1);
}
copy(ftsp);
fts_close(ftsp);
exit(exit_val);
}
static void
copy(ftsp)
FTS *ftsp;
{
register FTSENT *curr;
register int base, nlen;
struct stat to_stat;
int dne;
char *c, *n;
while (curr = fts_read(ftsp)) {
switch(curr->fts_info) {
case FTS_NS:
case FTS_ERR:
err("%s: %s",
curr->fts_path, strerror(curr->fts_errno));
exit_val = 1;
continue;
case FTS_DC:
err("%s: directory causes a cycle", curr->fts_path);
exit_val = 1;
continue;
case FTS_DP:
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) {
err("%s/%s: name too long (not copied)",
to.p_path, curr->fts_name);
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.
*/
if (curr->fts_level == FTS_ROOTLEVEL)
if (type != DIR_TO_DNE) {
c = rindex(curr->fts_path, '/');
base = (c == NULL) ? 0 :
(int) (c - curr->fts_path + 1);
if (!strcmp(&curr->fts_path[base],
".."))
base += 1;
} else
base = curr->fts_pathlen;
if (to.target_end[-1] != '/') {
*to.target_end = '/';
*(to.target_end + 1) = 0;
}
n = &curr->fts_path[base];
nlen = curr->fts_pathlen - base;
(void)strncat(to.target_end + 1, n, nlen);
to.p_end = to.target_end + nlen + 1;
*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) {
(void)fprintf(stderr,
"%s: %s and %s are identical (not copied).\n",
progname, to.p_path, curr->fts_path);
exit_val = 1;
if (S_ISDIR(curr->fts_statp->st_mode))
(void)fts_set(ftsp, curr, FTS_SKIP);
continue;
}
dne = 0;
}
switch (curr->fts_statp->st_mode & S_IFMT) {
case S_IFLNK:
copy_link(curr, !dne);
break;
case S_IFDIR:
if (!rflag && !orflag) {
(void)fprintf(stderr,
"%s: %s is a directory (not copied).\n",
progname, curr->fts_path);
(void)fts_set(ftsp, curr, FTS_SKIP);
exit_val = 1;
break;
}
if (dne) {
/*
* 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 cp fails.
*/
if (mkdir(to.p_path,
curr->fts_statp->st_mode|S_IRWXU) < 0) {
err("%s: %s", to.p_path,
strerror(errno));
return;
}
} else if (!S_ISDIR(to_stat.st_mode)) {
(void)fprintf(stderr,
"%s: %s: not a directory.\n", progname,
to.p_path);
return;
}
/*
* 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);
else if (dne)
(void)chmod(to.p_path,
curr->fts_statp->st_mode);
break;
case S_IFCHR:
case S_IFBLK:
if (rflag)
copy_special(curr->fts_statp, !dne);
else
copy_file(curr, dne);
break;
case S_IFIFO:
if (rflag)
copy_fifo(curr->fts_statp, !dne);
else
copy_file(curr, dne);
break;
default:
copy_file(curr, dne);
break;
}
}
}
/*
* 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.
*/
static int
mastercmp(a, b)
const FTSENT **a, **b;
{
register 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);
}