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/* Copyright 2008 Rob Landley <rob@landley.net>
*
* See http://opengroup.org/onlinepubs/9699919799/utilities/cp.html
*
* TODO: sHLP
USE_CP(NEWTOY(cp, "<2"USE_CP_MORE("rdavsln")"RHLPfip[-ni]", TOYFLAG_BIN))
config CP
bool "cp"
default y
help
usage: cp [-fipRHLP] 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)
-H Follow symlinks listed on command line
-L Follow all symlinks
-P Do not follow symlinks [default]
config CP_MORE
bool "cp -rdavsl options"
default y
depends on CP
help
usage: cp [-rdavsl]
-a same as -dpr
-d don't dereference symlinks
-l hard link instead of copy
-n no clobber (don't overwrite DEST)
-r synonym for -R
-s symlink instead of copy
-v verbose
*/
#define FOR_cp
#include "toys.h"
// TODO: PLHlsd
GLOBALS(
char *destname;
struct stat top;
)
// Callback from dirtree_read() for each file/directory under a source dir.
int cp_node(struct dirtree *try)
{
int fdout = -1, cfd = try->parent ? try->parent->extra : AT_FDCWD,
tfd = dirtree_parentfd(try);
unsigned flags = toys.optflags;
char *catch = try->parent ? try->name : TT.destname, *err = "%s";
struct stat cst;
if (!dirtree_notdotdot(try)) return 0;
// If returning from COMEAGAIN, jump straight to -p logic at end.
if (S_ISDIR(try->st.st_mode) && try->data == -1) {
fdout = try->extra;
err = 0;
} else {
// -d is only the same as -r for symlinks, not for directories
if (S_ISLNK(try->st.st_mode) & (flags & FLAG_d)) flags |= FLAG_r;
// Detect recursive copies via repeated top node (cp -R .. .) or
// identical source/target (fun with hardlinks).
if ((TT.top.st_dev == try->st.st_dev && TT.top.st_ino == try->st.st_ino
&& (catch = TT.destname))
|| (!fstatat(cfd, catch, &cst, 0) && cst.st_dev == try->st.st_dev
&& cst.st_ino == try->st.st_ino))
{
error_msg("'%s' is '%s'", catch, err = dirtree_path(try, 0));
free(err);
return 0;
}
// Handle -inv
if ((flags & (FLAG_i|FLAG_n)) && !faccessat(cfd, catch, R_OK, 0))
if ((flags & FLAG_n) || !yesno("cp: overwrite", 1)) return 0;
if (flags & FLAG_v) {
char *s = dirtree_path(try, 0);
printf("cp '%s'\n", s);
free(s);
}
// Loop for -f retry after unlink
do {
// directory, hardlink, symlink, mknod (char, block, fifo, socket), file
// Copy directory
if (S_ISDIR(try->st.st_mode)) {
struct stat st2;
if (!(flags & (FLAG_a|FLAG_r|FLAG_R))) {
err = "Skipped dir '%s'";
catch = try->name;
break;
}
// 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 (!mkdirat(cfd, catch, try->st.st_mode | 0200) || errno == EEXIST)
if (-1 != (try->extra = openat(cfd, catch, O_NOFOLLOW)))
if (!fstat(try->extra, &st2))
if (S_ISDIR(st2.st_mode)) return DIRTREE_COMEAGAIN;
// Hardlink
} else if (flags & FLAG_l) {
if (!linkat(tfd, try->name, cfd, catch, 0)) err = 0;
// Do something _other_ than copy contents of a file?
} else if (!S_ISREG(try->st.st_mode)
&& (try->parent || (flags & (FLAG_a|FLAG_r))))
{
int i;
// make symlink, or make block/char/fifo/socket
if (S_ISLNK(try->st.st_mode)
? (0 < (i = readlinkat(tfd, try->name, toybuf, sizeof(toybuf))) &&
sizeof(toybuf) > i && !symlinkat(toybuf, cfd, catch))
: !mknodat(cfd, catch, try->st.st_mode, try->st.st_rdev))
{
err = 0;
fdout = AT_FDCWD;
}
// Copy contents of file.
} else {
int fdin;
fdin = openat(tfd, try->name, O_RDONLY);
if (fdin < 0) {
catch = try->name;
break;
} else {
fdout = openat(cfd, catch, O_RDWR|O_CREAT|O_TRUNC, try->st.st_mode);
if (fdout >= 0) {
xsendfile(fdin, fdout);
err = 0;
}
close(fdin);
}
}
} while (err && (flags & FLAG_f) && !unlinkat(cfd, catch, 0));
}
if (fdout != -1) {
if (flags & (FLAG_a|FLAG_p)) {
struct timespec times[2];
// Inability to set these isn't fatal, some require root access.
times[0] = try->st.st_atim;
times[1] = try->st.st_mtim;
// If we can't get a filehandle to the actual object, use racy functions
if (fdout == AT_FDCWD) {
fchownat(cfd, catch, try->st.st_uid, try->st.st_gid,
AT_SYMLINK_NOFOLLOW);
utimensat(cfd, catch, times, AT_SYMLINK_NOFOLLOW);
// permission bits already correct for mknod, don't apply to symlink
} else {
fchown(fdout, try->st.st_uid, try->st.st_gid);
futimens(fdout, times);
fchmod(fdout, try->st.st_mode);
}
}
if (fdout != AT_FDCWD) xclose(fdout);
}
if (err) perror_msg(err, catch);
return 0;
}
void cp_main(void)
{
char *destname = toys.optargs[--toys.optc];
int i, destdir = !stat(destname, &TT.top) && S_ISDIR(TT.top.st_mode);
if (toys.optc>1 && !destdir) error_exit("'%s' not directory", destname);
if (toys.optflags & (FLAG_a|FLAG_p)) umask(0);
// Loop through sources
for (i=0; i<toys.optc; i++) {
struct dirtree *new;
char *src = toys.optargs[i];
// Skip nonexistent sources
if (!(new = dirtree_add_node(0, src, !(toys.optflags & (FLAG_d|FLAG_a)))))
perror_msg("bad '%s'", src);
else {
if (destdir) TT.destname = xmsprintf("%s/%s", destname, basename(src));
else TT.destname = destname;
dirtree_handle_callback(new, cp_node);
if (destdir) free(TT.destname);
}
}
}
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