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/* vi: set sw=4 ts=4:
*
* cp.c - Copy files.
*
* Copyright 2008 Rob Landley <rob@landley.net>
*
* See http://www.opengroup.org/onlinepubs/009695399/utilities/cp.html
*
* "R+ra+d+p+r"
USE_CP(NEWTOY(cp, "<2slrR+rdpa+d+p+rHLPif", TOYFLAG_BIN))
config CP
bool "cp"
default y
help
usage: cp -fiprdal SOURCE... DEST
Copy files from SOURCE to DEST. If more than one SOURCE, DEST must
be a directory.
-f force copy by deleting destination file
-i interactive, prompt before overwriting existing DEST
-p preserve timestamps, ownership, and permissions
-r recurse into subdirectories (DEST must be a directory)
-d don't dereference symlinks
-a same as -dpr
-l hard link instead of copying
*/
#include "toys.h"
#define FLAG_f 1
#define FLAG_i 2 // todo
#define FLAG_P 4 // todo
#define FLAG_L 8 // todo
#define FLAG_H 16 // todo
#define FLAG_a 32
#define FLAG_p 64
#define FLAG_d 128 // todo
#define FLAG_R 256
#define FLAG_r 512
#define FLAG_l 1024 // todo
#define FLAG_s 2048 // todo
DEFINE_GLOBALS(
char *destname;
int destisdir;
int destisnew;
int keep_symlinks;
)
#define TT this.cp
// Copy an individual file or directory to target.
void cp_file(char *src, char *dst, struct stat *srcst)
{
int fdout = -1;
// Copy directory or file to destination.
if (S_ISDIR(srcst->st_mode)) {
struct stat st2;
// Always make directory writeable to us, so we can create files in it.
//
// Yes, there's a race window between mkdir() and open() so it's
// possible that -p can be made to chown a directory other than the one
// we created. The closest we can do to closing this is make sure
// that what we open _is_ a directory rather than something else.
if (mkdir(dst, srcst->st_mode | 0200) || 0>(fdout=open(dst, 0))
|| fstat(fdout, &st2) || !S_ISDIR(st2.st_mode))
{
perror_exit("mkdir '%s'", dst);
}
} else if (TT.keep_symlinks && S_ISLNK(srcst->st_mode)) {
char *link = xreadlink(src);
// Note: -p currently has no effect on symlinks. How do you get a
// filehandle to them? O_NOFOLLOW causes the open to fail.
if (!link || symlink(link, dst)) perror_msg("link '%s'", dst);
free(link);
} else if (toys.optflags & FLAG_l) {
if (link(src, dst)) perror_msg("link '%s'");
return;
} else {
int fdin, i;
fdin = xopen(src, O_RDONLY);
for (i=2 ; i; i--) {
fdout = open(dst, O_RDWR|O_CREAT|O_TRUNC, srcst->st_mode);
if (fdout>=0 || !(toys.optflags & FLAG_f)) break;
unlink(dst);
}
if (fdout<0) perror_exit("%s", dst);
xsendfile(fdin, fdout);
close(fdin);
}
// Inability to set these isn't fatal, some require root access.
// Can't do fchmod() etc here because -p works on mkdir, too.
if (toys.optflags & FLAG_p) {
int mask = umask(0);
struct utimbuf ut;
fchown(fdout,srcst->st_uid, srcst->st_gid);
ut.actime = srcst->st_atime;
ut.modtime = srcst->st_mtime;
utime(dst, &ut);
umask(mask);
}
xclose(fdout);
}
// Callback from dirtree_read() for each file/directory under a source dir.
int cp_node(char *path, struct dirtree *node)
{
char *s = path+strlen(path);
struct dirtree *n;
// Find appropriate chunk of path for destination.
for (n = node;;n = n->parent) {
while (s!=path) {
if (*(--s)=='/') break;
}
if (!n) break;
}
if (s != path) s++;
s = xmsprintf("%s/%s", TT.destname, s);
cp_file(path, s, &(node->st));
free(s);
return 0;
}
void cp_main(void)
{
struct stat st;
int i;
// Grab target argument. (Guaranteed to be there due to "<2" above.)
TT.destname = toys.optargs[--toys.optc];
// If destination doesn't exist, are we ok with that?
if (stat(TT.destname, &st)) {
if (toys.optc>1) goto error_notdir;
TT.destisnew++;
// If destination exists...
} else {
if (S_ISDIR(st.st_mode)) TT.destisdir++;
else if (toys.optc > 1) goto error_notdir;
}
// Handle sources
for (i=0; i<toys.optc; i++) {
char *src = toys.optargs[i];
char *dst;
// Skip src==dest (should check inodes to catch "cp blah ./blah").
if (!strcmp(src, TT.destname)) continue;
// Skip nonexistent sources.
TT.keep_symlinks = toys.optflags & FLAG_d;
if (TT.keep_symlinks ? lstat(src, &st) : stat(src, &st))
{
perror_msg("'%s'", src);
toys.exitval = 1;
continue;
}
dst = strrchr(src, '/');
if (dst) dst++;
else dst=src;
// Copy directory or file.
if (TT.destisdir) dst = xmsprintf("%s/%s", TT.destname, dst);
if (S_ISDIR(st.st_mode)) {
if (toys.optflags & FLAG_r) {
cp_file(src, dst, &st);
TT.keep_symlinks++;
strncpy(toybuf, src, sizeof(toybuf)-1);
toybuf[sizeof(toybuf)-1]=0;
dirtree_read(toybuf, NULL, cp_node);
} else error_msg("Skipped dir '%s'", src);
} else cp_file(src, dst, &st);
if (TT.destisdir) free(dst);
}
return;
error_notdir:
error_exit("'%s' isn't a directory", TT.destname);
}
|
