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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("rdavsl")"RHLPfip", 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]
-r synonym for -R
-d don't dereference symlinks
-a same as -dpr
-l hard link instead of copy
-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, cfd = try->parent ? try->parent->extra : AT_FDCWD,
tfd = dirtree_parentfd(try);
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;
goto dashp;
}
// 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))
{
char *s = dirtree_path(try, 0);
error_msg("'%s' is '%s'", catch, s);
free(s);
return 0;
}
// Handle -i and -v
if ((toys.optflags & FLAG_i) && !faccessat(cfd, catch, R_OK, 0)
&& !yesno("cp: overwrite", 1)) return 0;
if (toys.optflags & FLAG_v) {
char *s = dirtree_path(try, 0);
printf("cp '%s'\n", s);
free(s);
}
// Copy directory or file to destination.
if (S_ISDIR(try->st.st_mode)) {
struct stat st2;
if (!(toys.optflags & (FLAG_a|FLAG_r|FLAG_R))) {
err = "Skipped dir '%s'";
catch = try->name;
// 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.
} else if ((mkdirat(cfd, catch, try->st.st_mode | 0200) && errno != EEXIST)
|| 0>(try->extra = openat(cfd, catch, 0)) || fstat(try->extra, &st2)
|| !S_ISDIR(st2.st_mode));
else return DIRTREE_COMEAGAIN;
} else if (S_ISLNK(try->st.st_mode)
&& (try->parent || (toys.optflags & (FLAG_a|FLAG_d))))
{
int i = readlinkat(tfd, try->name, toybuf, sizeof(toybuf));
if (i > 0 && i < sizeof(toybuf) && !symlinkat(toybuf, cfd, catch)) err = 0;
} else if (toys.optflags & FLAG_l) {
if (!linkat(tfd, try->name, cfd, catch, 0)) err = 0;
} else {
int fdin, i;
fdin = openat(tfd, try->name, O_RDONLY);
if (fdin < 0) catch = try->name;
else {
for (i=2 ; i; i--) {
fdout = openat(cfd, catch, O_RDWR|O_CREAT|O_TRUNC, try->st.st_mode);
if (fdout>=0 || !(toys.optflags & FLAG_f)) break;
unlinkat(cfd, catch, 0);
}
if (fdout >= 0) {
xsendfile(fdin, fdout);
err = 0;
}
close(fdin);
}
dashp:
if (toys.optflags & (FLAG_a|FLAG_p)) {
struct timespec times[2];
// Inability to set these isn't fatal, some require root access.
fchown(fdout, try->st.st_uid, try->st.st_gid);
times[0] = try->st.st_atim;
times[1] = try->st.st_mtim;
futimens(fdout, times);
fchmod(fdout, try->st.st_mode);
}
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);
// 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);
}
}
}
|
