mirror of
https://github.com/topjohnwu/ndk-busybox.git
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4eed2c6c50
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
194 lines
5.0 KiB
C
194 lines
5.0 KiB
C
/* vi: set sw=4 ts=4: */
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/*
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* chattr.c - Change file attributes on an ext2 file system
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*
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* Copyright (C) 1993, 1994 Remy Card <card@masi.ibp.fr>
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* Laboratoire MASI, Institut Blaise Pascal
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* Universite Pierre et Marie Curie (Paris VI)
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*
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* This file can be redistributed under the terms of the GNU General
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* Public License
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*/
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//config:config CHATTR
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//config: bool "chattr (3.2 kb)"
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//config: default y
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//config: help
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//config: chattr changes the file attributes on a second extended file system.
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//applet:IF_CHATTR(APPLET(chattr, BB_DIR_BIN, BB_SUID_DROP))
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//kbuild:lib-$(CONFIG_CHATTR) += chattr.o e2fs_lib.o
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//usage:#define chattr_trivial_usage
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//usage: "[-R] [-+=AacDdijsStTu] [-v VERSION] [FILE]..."
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//usage:#define chattr_full_usage "\n\n"
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//usage: "Change ext2 file attributes\n"
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//usage: "\nModifiers:"
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//usage: "\n -,+,= Remove/add/set attributes"
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//usage: "\nAttributes:"
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//usage: "\n A Don't track atime"
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//usage: "\n a Append mode only"
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//usage: "\n c Enable compress"
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//usage: "\n D Write dir contents synchronously"
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//usage: "\n d Don't backup with dump"
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//usage: "\n i Cannot be modified (immutable)"
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//usage: "\n j Write all data to journal first"
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//usage: "\n s Zero disk storage when deleted"
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//usage: "\n S Write synchronously"
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//usage: "\n t Disable tail-merging of partial blocks with other files"
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//usage: "\n u Allow file to be undeleted"
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//usage: "\n -R Recurse"
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//usage: "\n -v VER Set version/generation number"
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#include "libbb.h"
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#include "e2fs_lib.h"
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#define OPT_ADD 1
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#define OPT_REM 2
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#define OPT_SET 4
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#define OPT_SET_VER 8
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struct globals {
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unsigned long version;
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unsigned long af;
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unsigned long rf;
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smallint flags;
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smallint recursive;
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};
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static unsigned long get_flag(char c)
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{
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const char *fp = strchr(e2attr_flags_sname_chattr, c);
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if (fp)
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return e2attr_flags_value_chattr[fp - e2attr_flags_sname_chattr];
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bb_show_usage();
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}
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static int decode_arg(const char *arg, struct globals *gp)
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{
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unsigned long *fl;
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char opt = *arg++;
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fl = &gp->af;
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if (opt == '-') {
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gp->flags |= OPT_REM;
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fl = &gp->rf;
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} else if (opt == '+') {
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gp->flags |= OPT_ADD;
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} else if (opt == '=') {
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gp->flags |= OPT_SET;
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} else
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return 0;
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while (*arg)
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*fl |= get_flag(*arg++);
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return 1;
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}
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static void change_attributes(const char *name, struct globals *gp);
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static int FAST_FUNC chattr_dir_proc(const char *dir_name, struct dirent *de, void *gp)
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{
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char *path = concat_subpath_file(dir_name, de->d_name);
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/* path is NULL if de->d_name is "." or "..", else... */
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if (path) {
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change_attributes(path, gp);
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free(path);
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}
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return 0;
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}
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static void change_attributes(const char *name, struct globals *gp)
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{
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unsigned long fsflags;
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struct stat st;
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if (lstat(name, &st) != 0) {
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bb_perror_msg("stat %s", name);
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return;
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}
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if (S_ISLNK(st.st_mode) && gp->recursive)
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return;
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/* Don't try to open device files, fifos etc. We probably
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* ought to display an error if the file was explicitly given
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* on the command line (whether or not recursive was
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* requested). */
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if (!S_ISREG(st.st_mode) && !S_ISLNK(st.st_mode) && !S_ISDIR(st.st_mode))
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return;
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if (gp->flags & OPT_SET_VER)
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if (fsetversion(name, gp->version) != 0)
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bb_perror_msg("setting version on %s", name);
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if (gp->flags & OPT_SET) {
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fsflags = gp->af;
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} else {
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if (fgetflags(name, &fsflags) != 0) {
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bb_perror_msg("reading flags on %s", name);
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goto skip_setflags;
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}
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/*if (gp->flags & OPT_REM) - not needed, rf is zero otherwise */
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fsflags &= ~gp->rf;
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/*if (gp->flags & OPT_ADD) - not needed, af is zero otherwise */
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fsflags |= gp->af;
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/* What is this? And why it's not done for SET case? */
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if (!S_ISDIR(st.st_mode))
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fsflags &= ~EXT2_DIRSYNC_FL;
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}
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if (fsetflags(name, fsflags) != 0)
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bb_perror_msg("setting flags on %s", name);
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skip_setflags:
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if (gp->recursive && S_ISDIR(st.st_mode))
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iterate_on_dir(name, chattr_dir_proc, gp);
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}
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int chattr_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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int chattr_main(int argc UNUSED_PARAM, char **argv)
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{
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struct globals g;
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char *arg;
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memset(&g, 0, sizeof(g));
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/* parse the args */
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while ((arg = *++argv)) {
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/* take care of -R and -v <version> */
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if (arg[0] == '-'
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&& (arg[1] == 'R' || arg[1] == 'v')
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&& !arg[2]
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) {
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if (arg[1] == 'R') {
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g.recursive = 1;
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continue;
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}
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/* arg[1] == 'v' */
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if (!*++argv)
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bb_show_usage();
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g.version = xatoul(*argv);
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g.flags |= OPT_SET_VER;
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continue;
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}
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if (!decode_arg(arg, &g))
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break;
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}
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/* run sanity checks on all the arguments given us */
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if (!*argv)
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bb_show_usage();
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if ((g.flags & OPT_SET) && (g.flags & (OPT_ADD|OPT_REM)))
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bb_error_msg_and_die("= is incompatible with - and +");
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if (g.rf & g.af)
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bb_error_msg_and_die("can't set and unset a flag");
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if (!g.flags)
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bb_error_msg_and_die("must use '-v', =, - or +");
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/* now run chattr on all the files passed to us */
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do change_attributes(*argv, &g); while (*++argv);
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return EXIT_SUCCESS;
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}
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