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    Annotation of /trunk/mkinitrd-magellan/busybox/applets/busybox.c

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    Revision 532 - (hide annotations) (download)
    Sat Sep 1 22:45:15 2007 UTC (16 years, 8 months ago) by niro
    File MIME type: text/plain
    File size: 3905 byte(s) 
    -import if magellan mkinitrd; it is a fork of redhats mkinitrd-5.0.8 with all magellan patches and features; deprecates magellan-src/mkinitrd
    1 niro 532 /* vi: set sw=4 ts=4: */
    2     /*
    3     * BusyBox' main applet dispatcher.
    4     *
    5     * Licensed under GPLv2, see file LICENSE in this tarball for details.
    6     */
    7     #include "busybox.h"
    8    
    9     const char *applet_name ATTRIBUTE_EXTERNALLY_VISIBLE;
    10    
    11     #ifdef CONFIG_FEATURE_INSTALLER
    12     /*
    13     * directory table
    14     * this should be consistent w/ the enum, busybox.h::Location,
    15     * or else...
    16     */
    17     static const char usr_bin [] = "/usr/bin";
    18     static const char usr_sbin[] = "/usr/sbin";
    19    
    20     static const char* const install_dir[] = {
    21     &usr_bin [8], /* "", equivalent to "/" for concat_path_file() */
    22     &usr_bin [4], /* "/bin" */
    23     &usr_sbin[4], /* "/sbin" */
    24     usr_bin,
    25     usr_sbin
    26     };
    27    
    28     /* abstract link() */
    29     typedef int (*link_func)(const char *, const char *);
    30    
    31     /* create (sym)links for each applet */
    32     static void install_links(const char *busybox, int use_symbolic_links)
    33     {
    34     link_func lf = link;
    35     char *fpc;
    36     int i;
    37     int rc;
    38    
    39     if (use_symbolic_links)
    40     lf = symlink;
    41    
    42     for (i = 0; applets[i].name != NULL; i++) {
    43     fpc = concat_path_file(
    44     install_dir[applets[i].location],
    45     applets[i].name);
    46     rc = lf(busybox, fpc);
    47     if (rc != 0 && errno != EEXIST) {
    48     bb_perror_msg("%s", fpc);
    49     }
    50     free(fpc);
    51     }
    52     }
    53    
    54     #else
    55     #define install_links(x,y)
    56     #endif /* CONFIG_FEATURE_INSTALLER */
    57    
    58     int main(int argc, char **argv)
    59     {
    60     const char *s;
    61    
    62     applet_name = argv[0];
    63     if (*applet_name == '-')
    64     applet_name++;
    65     while ((s = strchr(applet_name, '/')))
    66     applet_name = s + 1;
    67    
    68     /* Set locale for everybody except 'init' */
    69     if (ENABLE_LOCALE_SUPPORT && getpid() != 1)
    70     setlocale(LC_ALL, "");
    71    
    72     run_applet_by_name(applet_name, argc, argv);
    73     bb_error_msg_and_die("applet not found");
    74     }
    75    
    76     int busybox_main(int argc, char **argv)
    77     {
    78     /*
    79     * This style of argument parsing doesn't scale well
    80     * in the event that busybox starts wanting more --options.
    81     * If someone has a cleaner approach, by all means implement it.
    82     */
    83     if (ENABLE_FEATURE_INSTALLER && argc > 1 && !strcmp(argv[1], "--install")) {
    84     int use_symbolic_links = 0;
    85     char *busybox;
    86    
    87     /* to use symlinks, or not to use symlinks... */
    88     if (argc > 2)
    89     if (strcmp(argv[2], "-s") == 0)
    90     use_symbolic_links = 1;
    91    
    92     /* link */
    93     // XXX: FIXME: this is broken. Why not just use argv[0] ?
    94     busybox = xreadlink("/proc/self/exe");
    95     if (!busybox)
    96     return 1;
    97     install_links(busybox, use_symbolic_links);
    98     if (ENABLE_FEATURE_CLEAN_UP)
    99     free(busybox);
    100     return 0;
    101     }
    102    
    103     /* Deal with --help. (Also print help when called with no arguments) */
    104    
    105     if (argc == 1 || !strcmp(argv[1], "--help") ) {
    106     if (argc > 2) {
    107     applet_name = argv[2];
    108     run_applet_by_name(applet_name, 2, argv);
    109     } else {
    110     const struct BB_applet *a;
    111     int col, output_width;
    112    
    113     output_width = 80 - sizeof("start-stop-daemon, ") - 8;
    114     if (ENABLE_FEATURE_AUTOWIDTH) {
    115     /* Obtain the terminal width. */
    116     get_terminal_width_height(0, &output_width, NULL);
    117     /* leading tab and room to wrap */
    118     output_width -= sizeof("start-stop-daemon, ") + 8;
    119     }
    120    
    121     printf("%s\n"
    122     "Copyright (C) 1998-2006  Erik Andersen, Rob Landley, and others.\n"
    123     "Licensed under GPLv2.  See source distribution for full notice.\n\n"
    124     "Usage: busybox [function] [arguments]...\n"
    125     " or: [function] [arguments]...\n\n"
    126     "\tBusyBox is a multi-call binary that combines many common Unix\n"
    127     "\tutilities into a single executable. Most people will create a\n"
    128     "\tlink to busybox for each function they wish to use and BusyBox\n"
    129     "\twill act like whatever it was invoked as!\n"
    130     "\nCurrently defined functions:\n", bb_msg_full_version);
    131     col = 0;
    132     for (a = applets; a->name;) {
    133     col += printf("%s%s", (col ? ", " : "\t"), a->name);
    134     a++;
    135     if (col > output_width && a->name) {
    136     puts(",");
    137     col = 0;
    138     }
    139     }
    140     puts("\n");
    141     return 0;
    142     }
    143     } else run_applet_by_name(argv[1], argc - 1, argv + 1);
    144    
    145     bb_error_msg_and_die("applet not found");
    146     }