| /* vi: set sw=4 ts=4: */ |
| /* |
| * chattr.c - Change file attributes on an ext2 file system |
| * |
| * Copyright (C) 1993, 1994 Remy Card <card@masi.ibp.fr> |
| * Laboratoire MASI, Institut Blaise Pascal |
| * Universite Pierre et Marie Curie (Paris VI) |
| * |
| * This file can be redistributed under the terms of the GNU General |
| * Public License |
| */ |
| //config:config CHATTR |
| //config: bool "chattr" |
| //config: default y |
| //config: help |
| //config: chattr changes the file attributes on a second extended file system. |
| |
| //applet:IF_CHATTR(APPLET(chattr, BB_DIR_BIN, BB_SUID_DROP)) |
| |
| //kbuild:lib-$(CONFIG_CHATTR) += chattr.o e2fs_lib.o |
| |
| //usage:#define chattr_trivial_usage |
| //usage: "[-R] [-+=AacDdijsStTu] [-v VERSION] [FILE]..." |
| //usage:#define chattr_full_usage "\n\n" |
| //usage: "Change ext2 file attributes\n" |
| //usage: "\nModifiers:" |
| //usage: "\n -,+,= Remove/add/set attributes" |
| //usage: "\nAttributes:" |
| //usage: "\n A Don't track atime" |
| //usage: "\n a Append mode only" |
| //usage: "\n c Enable compress" |
| //usage: "\n D Write dir contents synchronously" |
| //usage: "\n d Don't backup with dump" |
| //usage: "\n i Cannot be modified (immutable)" |
| //usage: "\n j Write all data to journal first" |
| //usage: "\n s Zero disk storage when deleted" |
| //usage: "\n S Write synchronously" |
| //usage: "\n t Disable tail-merging of partial blocks with other files" |
| //usage: "\n u Allow file to be undeleted" |
| //usage: "\n -R Recurse" |
| //usage: "\n -v VER Set version/generation number" |
| |
| #include "libbb.h" |
| #include "e2fs_lib.h" |
| |
| #define OPT_ADD 1 |
| #define OPT_REM 2 |
| #define OPT_SET 4 |
| #define OPT_SET_VER 8 |
| |
| struct globals { |
| unsigned long version; |
| unsigned long af; |
| unsigned long rf; |
| smallint flags; |
| smallint recursive; |
| }; |
| |
| static unsigned long get_flag(char c) |
| { |
| const char *fp = strchr(e2attr_flags_sname_chattr, c); |
| if (fp) |
| return e2attr_flags_value_chattr[fp - e2attr_flags_sname_chattr]; |
| bb_show_usage(); |
| } |
| |
| static int decode_arg(const char *arg, struct globals *gp) |
| { |
| unsigned long *fl; |
| char opt = *arg++; |
| |
| fl = &gp->af; |
| if (opt == '-') { |
| gp->flags |= OPT_REM; |
| fl = &gp->rf; |
| } else if (opt == '+') { |
| gp->flags |= OPT_ADD; |
| } else if (opt == '=') { |
| gp->flags |= OPT_SET; |
| } else |
| return 0; |
| |
| while (*arg) |
| *fl |= get_flag(*arg++); |
| |
| return 1; |
| } |
| |
| static void change_attributes(const char *name, struct globals *gp); |
| |
| static int FAST_FUNC chattr_dir_proc(const char *dir_name, struct dirent *de, void *gp) |
| { |
| char *path = concat_subpath_file(dir_name, de->d_name); |
| /* path is NULL if de->d_name is "." or "..", else... */ |
| if (path) { |
| change_attributes(path, gp); |
| free(path); |
| } |
| return 0; |
| } |
| |
| static void change_attributes(const char *name, struct globals *gp) |
| { |
| unsigned long fsflags; |
| struct stat st; |
| |
| if (lstat(name, &st) != 0) { |
| bb_perror_msg("stat %s", name); |
| return; |
| } |
| if (S_ISLNK(st.st_mode) && gp->recursive) |
| return; |
| |
| /* Don't try to open device files, fifos etc. We probably |
| * ought to display an error if the file was explicitly given |
| * on the command line (whether or not recursive was |
| * requested). */ |
| if (!S_ISREG(st.st_mode) && !S_ISLNK(st.st_mode) && !S_ISDIR(st.st_mode)) |
| return; |
| |
| if (gp->flags & OPT_SET_VER) |
| if (fsetversion(name, gp->version) != 0) |
| bb_perror_msg("setting version on %s", name); |
| |
| if (gp->flags & OPT_SET) { |
| fsflags = gp->af; |
| } else { |
| if (fgetflags(name, &fsflags) != 0) { |
| bb_perror_msg("reading flags on %s", name); |
| goto skip_setflags; |
| } |
| /*if (gp->flags & OPT_REM) - not needed, rf is zero otherwise */ |
| fsflags &= ~gp->rf; |
| /*if (gp->flags & OPT_ADD) - not needed, af is zero otherwise */ |
| fsflags |= gp->af; |
| /* What is this? And why it's not done for SET case? */ |
| if (!S_ISDIR(st.st_mode)) |
| fsflags &= ~EXT2_DIRSYNC_FL; |
| } |
| if (fsetflags(name, fsflags) != 0) |
| bb_perror_msg("setting flags on %s", name); |
| |
| skip_setflags: |
| if (gp->recursive && S_ISDIR(st.st_mode)) |
| iterate_on_dir(name, chattr_dir_proc, gp); |
| } |
| |
| int chattr_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; |
| int chattr_main(int argc UNUSED_PARAM, char **argv) |
| { |
| struct globals g; |
| char *arg; |
| |
| memset(&g, 0, sizeof(g)); |
| |
| /* parse the args */ |
| while ((arg = *++argv)) { |
| /* take care of -R and -v <version> */ |
| if (arg[0] == '-' |
| && (arg[1] == 'R' || arg[1] == 'v') |
| && !arg[2] |
| ) { |
| if (arg[1] == 'R') { |
| g.recursive = 1; |
| continue; |
| } |
| /* arg[1] == 'v' */ |
| if (!*++argv) |
| bb_show_usage(); |
| g.version = xatoul(*argv); |
| g.flags |= OPT_SET_VER; |
| continue; |
| } |
| |
| if (!decode_arg(arg, &g)) |
| break; |
| } |
| |
| /* run sanity checks on all the arguments given us */ |
| if (!*argv) |
| bb_show_usage(); |
| if ((g.flags & OPT_SET) && (g.flags & (OPT_ADD|OPT_REM))) |
| bb_error_msg_and_die("= is incompatible with - and +"); |
| if (g.rf & g.af) |
| bb_error_msg_and_die("can't set and unset a flag"); |
| if (!g.flags) |
| bb_error_msg_and_die("must use '-v', =, - or +"); |
| |
| /* now run chattr on all the files passed to us */ |
| do change_attributes(*argv, &g); while (*++argv); |
| |
| return EXIT_SUCCESS; |
| } |