| /* 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 (!faccessat(cfd, catch, F_OK, 0) && !S_ISDIR(cst.st_mode)) { |
| char *s; |
| |
| if (S_ISDIR(try->st.st_dev)) { |
| error_msg("dir at '%s'", s = dirtree_path(try, 0)); |
| free(s); |
| return 0; |
| } else if (flags & FLAG_n) return 0; |
| else if (flags & FLAG_i) { |
| fprintf(stderr, "cp: overwrite '%s'", s = dirtree_path(try, 0)); |
| free(s); |
| if (!yesno("", 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; |
| |
| // Copy tree as symlinks. For non-absolute paths this involves |
| // appending the right number of .. entries as you go down the tree. |
| |
| } else if (flags & FLAG_s) { |
| char *s; |
| struct dirtree *or; |
| int dotdots = 0; |
| |
| s = dirtree_path(try, 0); |
| for (or = try; or->parent; or = or->parent) dotdots++; |
| |
| if (*or->name == '/') dotdots = 0; |
| if (dotdots) { |
| char *s2 = xmsprintf("% *c%s", 3*dotdots, ' ', s); |
| free(s); |
| s = s2; |
| while(dotdots--) { |
| memcpy(s2, "../", 3); |
| s2 += 3; |
| } |
| } |
| if (!symlinkat(s, cfd, catch)) { |
| err = 0; |
| fdout = AT_FDCWD; |
| } |
| free(s); |
| |
| // 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|FLAG_n)) && !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); |
| } |
| } |
| } |
