view toys/cp.c @ 565:44abf4d901f3

Rewrite dirtree so we don't need readdir, scandir, and fts.h. Rewrite ls (from scratch) to use new dirtree infrastructure. (This breaks everything else that currently uses dirtree.)
author Rob Landley <>
date Sat, 14 Apr 2012 22:30:41 -0500
parents 878b94b32866
children 9802b2afbce8
line wrap: on
line source

/* vi: set sw=4 ts=4:
 * cp.c - Copy files.
 * Copyright 2008 Rob Landley <>
 * See
 * "R+ra+d+p+r"
USE_CP(NEWTOY(cp, "<2vslrR+rdpa+d+p+rHLPif", TOYFLAG_BIN))

config CP
	bool "cp (broken by dirtree changes)"
	default n
	  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
		-v	verbose

#include "toys.h"

#define FLAG_f 1
#define FLAG_i 2
#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 FLAG_v 4098

	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;

	// -i flag is specified and dst file exists.
	if ((toys.optflags&FLAG_i) && !access(dst, R_OK)
		&& !yesno("cp: overwrite", 1))

	if (toys.optflags & FLAG_v)
		printf("'%s' -> '%s'\n", src, dst);

	// 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) && errno != EEXIST)
			|| 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);
	} else if (toys.optflags & FLAG_l) {
		if (link(src, dst)) perror_msg("link '%s'");
	} 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;
		if (fdout<0) perror_exit("%s", dst);
		xsendfile(fdin, fdout);

	// 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;

		(void) fchown(fdout,srcst->st_uid, srcst->st_gid);
		ut.actime = srcst->st_atime;
		ut.modtime = srcst->st_mtime;
		utime(dst, &ut);

// Callback from dirtree_read() for each file/directory under a source dir.

int cp_node(struct dirtree *node)
	char *path = dirtree_path(node, 0); // TODO: use openat() instead
	char *s = path+strlen(path);
	struct dirtree *n;

	// Find appropriate chunk of path for destination.

	n = node;
	if (!TT.destisdir) n = n->parent;
	for (;;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(path); // redo this whole darn function.

	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;

	// 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 (TODO 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;

		// Copy directory or file.

		if (TT.destisdir) {
			dst = strrchr(src, '/');
			if (dst) dst++;
			else dst=src;
			dst = xmsprintf("%s/%s", TT.destname, dst);
		} else dst = TT.destname;
		if (S_ISDIR(st.st_mode)) {
			if (toys.optflags & FLAG_r) {
				cp_file(src, dst, &st);

				strncpy(toybuf, src, sizeof(toybuf)-1);
				dirtree_read(toybuf, cp_node);
			} else error_msg("Skipped dir '%s'", src);
		} else cp_file(src, dst, &st);
		if (TT.destisdir) free(dst);


	error_exit("'%s' isn't a directory", TT.destname);