/* 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 */ /* * History: * 93/10/30 - Creation * 93/11/13 - Replace stat() calls by lstat() to avoid loops * 94/02/27 - Integrated in Ted's distribution * 98/12/29 - Ignore symlinks when working recursively (G M Sipe) * 98/12/29 - Display version info only when -V specified (G M Sipe) */ //usage:#define chattr_trivial_usage //usage: "[-R] [-+=AacDdijsStTu] [-v VERSION] [FILE]..." //usage:#define chattr_full_usage "\n\n" //usage: "Change file attributes on an ext2 fs\n" //usage: "\nModifiers:" //usage: "\n - Remove attributes" //usage: "\n + Add attributes" //usage: "\n = 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 file contents 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 Set the file's 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; }