X-Git-Url: https://git.librecmc.org/?a=blobdiff_plain;ds=sidebyside;f=coreutils%2Fln.c;h=3b822e8c7fa0b2f92bc48dcf66f7dadb62021baf;hb=f3114a3bd0d468a417e9e4a254d76ecf1cf35178;hp=c54026c6255ebfd988f4c90469345ed05d7ae067;hpb=029011b9eeaf491d00fda1d072c4c6094df96c3a;p=oweals%2Fbusybox.git diff --git a/coreutils/ln.c b/coreutils/ln.c index c54026c62..3b822e8c7 100644 --- a/coreutils/ln.c +++ b/coreutils/ln.c @@ -2,137 +2,140 @@ /* * Mini ln implementation for busybox * + * Copyright (C) 1999-2004 by Erik Andersen * - * Copyright (C) 1999 by Lineo, inc. - * Written by Erik Andersen , - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License as published by - * the Free Software Foundation; either version 2 of the License, or - * (at your option) any later version. - * - * This program is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU - * General Public License for more details. - * - * You should have received a copy of the GNU General Public License - * along with this program; if not, write to the Free Software - * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA - * + * Licensed under GPLv2 or later, see file LICENSE in this source tree. */ -#include "internal.h" -#define BB_DECLARE_EXTERN -#define bb_need_name_too_long -#define bb_need_not_a_directory -#include "messages.c" - -#include -#include -#include -#include /* for PATH_MAX */ - -static const char ln_usage[] = - "ln [OPTION] TARGET... LINK_NAME|DIRECTORY\n\n" - "Create a link named LINK_NAME or DIRECTORY to the specified TARGET\n\n" - "Options:\n" - "\t-s\tmake symbolic links instead of hard links\n" - - "\t-f\tremove existing destination files\n" - "\t-n\tno dereference symlinks - treat like normal file\n"; - -static int symlinkFlag = FALSE; -static int removeoldFlag = FALSE; -static int followLinks = TRUE; - -extern int ln_main(int argc, char **argv) +/* BB_AUDIT SUSv3 compliant */ +/* BB_AUDIT GNU options missing: -d, -F, -i, and -v. */ +/* http://www.opengroup.org/onlinepubs/007904975/utilities/ln.html */ + +//usage:#define ln_trivial_usage +//usage: "[OPTIONS] TARGET... LINK|DIR" +//usage:#define ln_full_usage "\n\n" +//usage: "Create a link LINK or DIR/TARGET to the specified TARGET(s)\n" +//usage: "\n -s Make symlinks instead of hardlinks" +//usage: "\n -f Remove existing destinations" +//usage: "\n -n Don't dereference symlinks - treat like normal file" +//usage: "\n -b Make a backup of the target (if exists) before link operation" +//usage: "\n -S suf Use suffix instead of ~ when making backup files" +//usage: "\n -T 2nd arg must be a DIR" +//usage: "\n -v Verbose" +//usage: +//usage:#define ln_example_usage +//usage: "$ ln -s BusyBox /tmp/ls\n" +//usage: "$ ls -l /tmp/ls\n" +//usage: "lrwxrwxrwx 1 root root 7 Apr 12 18:39 ls -> BusyBox*\n" + +#include "libbb.h" + +/* This is a NOEXEC applet. Be very careful! */ + + +#define LN_SYMLINK (1 << 0) +#define LN_FORCE (1 << 1) +#define LN_NODEREFERENCE (1 << 2) +#define LN_BACKUP (1 << 3) +#define LN_SUFFIX (1 << 4) +#define LN_VERBOSE (1 << 5) +#define LN_LINKFILE (1 << 6) + +int ln_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; +int ln_main(int argc, char **argv) { - char *linkName; - int linkIntoDirFlag; - - if (argc < 3) { - usage(ln_usage); + int status = EXIT_SUCCESS; + int opts; + char *last; + char *src_name; + char *src; + char *suffix = (char*)"~"; + struct stat statbuf; + int (*link_func)(const char *, const char *); + + opt_complementary = "-1"; /* min one arg */ + opts = getopt32(argv, "sfnbS:vT", &suffix); + + last = argv[argc - 1]; + argv += optind; + argc -= optind; + + if ((opts & LN_LINKFILE) && argc > 2) { + bb_error_msg_and_die("-T accepts 2 args max"); } - argc--; - argv++; - - /* Parse any options */ - while (**argv == '-') { - while (*++(*argv)) - switch (**argv) { - case 's': - symlinkFlag = TRUE; - break; - case 'f': - removeoldFlag = TRUE; - break; - case 'n': - followLinks = FALSE; - break; - default: - usage(ln_usage); - } - argc--; - argv++; - } - - linkName = argv[argc - 1]; - if (strlen(linkName) > PATH_MAX) { - fprintf(stderr, name_too_long, "ln"); - exit FALSE; + if (!argv[1]) { + /* "ln PATH/TO/FILE" -> "ln PATH/TO/FILE FILE" */ + *--argv = last; + /* xstrdup is needed: "ln -s PATH/TO/FILE/" is equivalent to + * "ln -s PATH/TO/FILE/ FILE", not "ln -s PATH/TO/FILE FILE" + */ + last = bb_get_last_path_component_strip(xstrdup(last)); } - linkIntoDirFlag = isDirectory(linkName, TRUE, NULL); + do { + src_name = NULL; + src = last; - if ((argc > 3) && !linkIntoDirFlag) { - fprintf(stderr, not_a_directory, "ln", linkName); - exit FALSE; - } - - while (argc-- >= 2) { - char srcName[PATH_MAX + 1]; - int nChars, status; + if (is_directory(src, + (opts & LN_NODEREFERENCE) ^ LN_NODEREFERENCE + ) + ) { + if (opts & LN_LINKFILE) { + bb_error_msg_and_die("'%s' is a directory", src); + } + src_name = xstrdup(*argv); + src = concat_path_file(src, bb_get_last_path_component_strip(src_name)); + free(src_name); + src_name = src; + } + if (!(opts & LN_SYMLINK) && stat(*argv, &statbuf)) { + // coreutils: "ln dangling_symlink new_hardlink" works + if (lstat(*argv, &statbuf) || !S_ISLNK(statbuf.st_mode)) { + bb_simple_perror_msg(*argv); + status = EXIT_FAILURE; + free(src_name); + continue; + } + } - if (strlen(*argv) > PATH_MAX) { - fprintf(stderr, name_too_long, "ln"); - exit FALSE; + if (opts & LN_BACKUP) { + char *backup; + backup = xasprintf("%s%s", src, suffix); + if (rename(src, backup) < 0 && errno != ENOENT) { + bb_simple_perror_msg(src); + status = EXIT_FAILURE; + free(backup); + continue; + } + free(backup); + /* + * When the source and dest are both hard links to the same + * inode, a rename may succeed even though nothing happened. + * Therefore, always unlink(). + */ + unlink(src); + } else if (opts & LN_FORCE) { + unlink(src); } - if (followLinks == FALSE) { - strcpy(srcName, *argv); - } else { - /* Warning! This can silently truncate if > PATH_MAX, but - I don't think that there can be one > PATH_MAX anyway. */ - nChars = readlink(*argv, srcName, PATH_MAX); - srcName[nChars] = '\0'; + link_func = link; + if (opts & LN_SYMLINK) { + link_func = symlink; } - if (removeoldFlag == TRUE) { - status = (unlink(linkName) && errno != ENOENT); - if (status != 0) { - perror(linkName); - exit FALSE; - } + if (opts & LN_VERBOSE) { + printf("'%s' -> '%s'\n", src, *argv); } - if (symlinkFlag == TRUE) - status = symlink(*argv, linkName); - else - status = link(*argv, linkName); - if (status != 0) { - perror(linkName); - exit FALSE; + if (link_func(*argv, src) != 0) { + bb_simple_perror_msg(src); + status = EXIT_FAILURE; } - } - exit TRUE; -} -/* -Local Variables: -c-file-style: "linux" -c-basic-offset: 4 -tab-width: 4 -End: -*/ + free(src_name); + + } while ((++argv)[1]); + + return status; +}