0e55af6c61
function old new delta change_attributes 416 410 -6 Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
258 lines
7.1 KiB
C
258 lines
7.1 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 (3.8 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_NOEXEC(chattr, chattr, BB_DIR_BIN, BB_SUID_DROP, chattr))
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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] [-v VERSION] [-p PROJID] [-+=AacDdijsStTu] 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: "\n -R Recurse"
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//usage: "\n -v NUM Set version/generation number"
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//usage: "\n -p NUM Set project number"
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//-V, -f accepted but ignored
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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 No atime"
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//usage: "\n a Append only"
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//usage: "\n C No copy-on-write"
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//usage: "\n c Compressed"
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//usage: "\n D Synchronous dir updates"
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//usage: "\n d Don't backup with dump"
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//usage: "\n E Encrypted"
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//usage: "\n e File uses extents"
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//usage: "\n F Case-insensitive dir"
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//usage: "\n I Indexed dir"
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//usage: "\n i Immutable"
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//usage: "\n j Write data to journal first"
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//usage: "\n N File is stored in inode"
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//usage: "\n P Hierarchical project ID dir"
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//usage: "\n S Synchronous file updates"
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//usage: "\n s Zero storage when deleted"
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//usage: "\n T Top of dir hierarchy"
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//usage: "\n t Don't tail-merge with other files"
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//usage: "\n u Allow undelete"
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//usage: "\n V Verity"
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#include "libbb.h"
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#include "e2fs_lib.h"
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#define OPT_ADD (1 << 0)
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#define OPT_REM (1 << 1)
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#define OPT_SET (1 << 2)
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#define OPT_SET_VER (1 << 3)
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#define OPT_SET_PROJ (1 << 4)
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struct globals {
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unsigned version;
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unsigned af;
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unsigned rf;
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int flags;
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uint32_t projid;
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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 char** decode_arg(char **argv, struct globals *gp)
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{
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unsigned *fl;
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const char *arg = *argv;
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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; - WRONG, it can be an option */
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/* testcase: chattr =ae -R FILE should not complain "= is incompatible with - and +" */
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/* (and should not read flags, with =FLAGS they can be just set directly) */
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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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}
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while (*++arg) {
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if (opt == '-') {
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//e2fsprogs-1.43.1 accepts:
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// "-RRR", "-RRRv VER" and even "-ARRRva VER" and "-vvv V1 V2 V3"
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// but not "-vVER".
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// IOW: options are parsed as part of "remove attrs" strings,
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// if "v" is seen, next argv[] is VER, even if more opts/attrs follow in this argv[]!
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if (*arg == 'R') {
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gp->recursive = 1;
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continue;
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}
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if (*arg == 'V') {
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/*"verbose and print program version" (nop for now) */;
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continue;
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}
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if (*arg == 'f') {
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/*"suppress most error messages" (nop) */;
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continue;
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}
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if (*arg == 'v') {
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if (!*++argv)
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bb_show_usage();
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gp->version = xatou(*argv);
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gp->flags |= OPT_SET_VER;
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continue;
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}
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if (*arg == 'p') {
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if (!*++argv)
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bb_show_usage();
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gp->projid = xatou32(*argv);
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gp->flags |= OPT_SET_PROJ;
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continue;
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}
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/* not a known option, try as an attribute */
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gp->flags |= OPT_REM;
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}
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*fl |= get_flag(*arg); /* aborts on bad flag letter */
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}
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return argv;
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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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//TODO: use de->d_type (if it's not DT_UNKNOWN) to skip !(REG || DIR || LNK) entries without lstat?
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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 fsflags;
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int fd;
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struct stat st;
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if (lstat(name, &st) != 0) {
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bb_perror_msg("can't 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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fd = open_or_warn(name, O_RDONLY | O_NONBLOCK); /* neither read nor write asked for */
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if (fd >= 0) {
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int r;
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if (gp->flags & OPT_SET_VER) {
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r = ioctl(fd, EXT2_IOC_SETVERSION, &gp->version);
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if (r != 0)
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bb_perror_msg("setting %s on %s", "version", name);
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}
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if (gp->flags & OPT_SET_PROJ) {
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struct ext2_fsxattr fsxattr;
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r = ioctl(fd, EXT2_IOC_FSGETXATTR, &fsxattr);
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/* note: ^^^ may fail in 32-bit userspace on 64-bit kernel (seen on 4.12.0) */
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if (r != 0) {
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bb_perror_msg("getting %s on %s", "project ID", name);
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} else {
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fsxattr.fsx_projid = gp->projid;
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r = ioctl(fd, EXT2_IOC_FSSETXATTR, &fsxattr);
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if (r != 0)
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bb_perror_msg("setting %s on %s", "project ID", name);
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}
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}
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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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r = ioctl(fd, EXT2_IOC_GETFLAGS, &fsflags);
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if (r != 0) {
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bb_perror_msg("getting %s on %s", "flags", 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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r = ioctl(fd, EXT2_IOC_SETFLAGS, &fsflags);
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if (r != 0)
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bb_perror_msg("setting %s on %s", "flags", name);
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skip_setflags:
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close(fd);
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}
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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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memset(&g, 0, sizeof(g));
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/* parse the args */
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for (;;) {
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char *arg = *++argv;
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if (!arg)
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bb_show_usage();
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if (arg[0] != '-' && arg[0] != '+' && arg[0] != '=')
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break;
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argv = decode_arg(argv, &g);
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}
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/* note: on loop exit, remaining argv[] is never empty */
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/* run sanity checks on all the arguments given us */
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if ((g.flags & OPT_SET) && (g.flags & (OPT_ADD|OPT_REM)))
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bb_simple_error_msg_and_die("= is incompatible with - and +");
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if (g.rf & g.af)
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bb_simple_error_msg_and_die("can't set and unset a flag");
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if (!g.flags)
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bb_simple_error_msg_and_die("must use -v, -p, =, - 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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