source: MondoRescue/branches/3.2/mindi-busybox/debianutils/run_parts.c@ 3232

/* vi: set sw=4 ts=4: */
/*
 * Mini run-parts implementation for busybox
 *
 * Copyright (C) 2007 Bernhard Reutner-Fischer
 *
 * Based on a older version that was in busybox which was 1k big.
 *   Copyright (C) 2001 by Emanuele Aina <emanuele.aina@tiscali.it>
 *
 * Based on the Debian run-parts program, version 1.15
 *   Copyright (C) 1996 Jeff Noxon <jeff@router.patch.net>,
 *   Copyright (C) 1996-1999 Guy Maor <maor@debian.org>
 *
 * Licensed under GPLv2 or later, see file LICENSE in this source tree.
 */

/* This is my first attempt to write a program in C (well, this is my first
 * attempt to write a program! :-) . */

/* This piece of code is heavily based on the original version of run-parts,
 * taken from debian-utils. I've only removed the long options and the
 * report mode. As the original run-parts support only long options, I've
 * broken compatibility because the BusyBox policy doesn't allow them.
 * The supported options are:
 * -t           test. Print the name of the files to be executed, without
 *              execute them.
 * -a ARG       argument. Pass ARG as an argument the program executed. It can
 *              be repeated to pass multiple arguments.
 * -u MASK      umask. Set the umask of the program executed to MASK.
 */

//usage:#define run_parts_trivial_usage
//usage:       "[-t"IF_FEATURE_RUN_PARTS_FANCY("l")"] [-a ARG]... [-u MASK] DIRECTORY"
//usage:#define run_parts_full_usage "\n\n"
//usage:       "Run a bunch of scripts in DIRECTORY\n"
//usage:     "\n    -t  Dry run"
//usage:    IF_FEATURE_RUN_PARTS_FANCY(
//usage:     "\n    -l  Print names of matching files even if they are not executable"
//usage:    )
//usage:     "\n    -a ARG  Pass ARG as argument to programs"
//usage:     "\n    -u MASK Set umask to MASK before running programs"
//usage:
//usage:#define run_parts_example_usage
//usage:       "$ run-parts -a start /etc/init.d\n"
//usage:       "$ run-parts -a stop=now /etc/init.d\n\n"
//usage:       "Let's assume you have a script foo/dosomething:\n"
//usage:       "#!/bin/sh\n"
//usage:       "for i in $*; do eval $i; done; unset i\n"
//usage:       "case \"$1\" in\n"
//usage:       "start*) echo starting something;;\n"
//usage:       "stop*) set -x; shutdown -h $stop;;\n"
//usage:       "esac\n\n"
//usage:       "Running this yields:\n"
//usage:       "$run-parts -a stop=+4m foo/\n"
//usage:       "+ shutdown -h +4m"

#include "libbb.h"

struct globals {
    char **names;
    int    cur;
    char  *cmd[1];
} FIX_ALIASING;
#define G (*(struct globals*)&bb_common_bufsiz1)
#define names (G.names)
#define cur   (G.cur  )
#define cmd   (G.cmd  )
#define INIT_G() do { } while (0)

enum { NUM_CMD = (COMMON_BUFSIZE - sizeof(G)) / sizeof(cmd[0]) - 1 };

enum {
    OPT_r = (1 << 0),
    OPT_a = (1 << 1),
    OPT_u = (1 << 2),
    OPT_t = (1 << 3),
    OPT_l = (1 << 4) * ENABLE_FEATURE_RUN_PARTS_FANCY,
};

#if ENABLE_FEATURE_RUN_PARTS_FANCY
#define list_mode (option_mask32 & OPT_l)
#else
#define list_mode 0
#endif

/* Is this a valid filename (upper/lower alpha, digits,
 * underscores, and hyphens only?)
 */
static bool invalid_name(const char *c)
{
    c = bb_basename(c);

    while (*c && (isalnum(*c) || *c == '_' || *c == '-'))
        c++;

    return *c; /* TRUE (!0) if terminating NUL is not reached */
}

static int bb_alphasort(const void *p1, const void *p2)
{
    int r = strcmp(*(char **) p1, *(char **) p2);
    return (option_mask32 & OPT_r) ? -r : r;
}

static int FAST_FUNC act(const char *file, struct stat *statbuf, void *args UNUSED_PARAM, int depth)
{
    if (depth == 1)
        return TRUE;

    if (depth == 2
     && (  !(statbuf->st_mode & (S_IFREG | S_IFLNK))
        || invalid_name(file)
        || (!list_mode && access(file, X_OK) != 0))
    ) {
        return SKIP;
    }

    names = xrealloc_vector(names, 4, cur);
    names[cur++] = xstrdup(file);
    /*names[cur] = NULL; - xrealloc_vector did it */

    return TRUE;
}

#if ENABLE_FEATURE_RUN_PARTS_LONG_OPTIONS
static const char runparts_longopts[] ALIGN1 =
    "arg\0"     Required_argument "a"
    "umask\0"   Required_argument "u"
    "test\0"    No_argument       "t"
#if ENABLE_FEATURE_RUN_PARTS_FANCY
    "list\0"    No_argument       "l"
    "reverse\0" No_argument       "r"
//TODO: "verbose\0" No_argument       "v"
#endif
    ;
#endif

int run_parts_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int run_parts_main(int argc UNUSED_PARAM, char **argv)
{
    const char *umask_p = "22";
    llist_t *arg_list = NULL;
    unsigned n;
    int ret;

    INIT_G();

#if ENABLE_FEATURE_RUN_PARTS_LONG_OPTIONS
    applet_long_options = runparts_longopts;
#endif
    /* We require exactly one argument: the directory name */
    opt_complementary = "=1:a::";
    getopt32(argv, "ra:u:t"IF_FEATURE_RUN_PARTS_FANCY("l"), &arg_list, &umask_p);

    umask(xstrtou_range(umask_p, 8, 0, 07777));

    n = 1;
    while (arg_list && n < NUM_CMD) {
        cmd[n++] = llist_pop(&arg_list);
    }
    /* cmd[n] = NULL; - is already zeroed out */

    /* run-parts has to sort executables by name before running them */

    recursive_action(argv[optind],
            ACTION_RECURSE|ACTION_FOLLOWLINKS,
            act,            /* file action */
            act,            /* dir action */
            NULL,           /* user data */
            1               /* depth */
        );

    if (!names)
        return 0;

    qsort(names, cur, sizeof(char *), bb_alphasort);

    n = 0;
    while (1) {
        char *name = *names++;
        if (!name)
            break;
        if (option_mask32 & (OPT_t | OPT_l)) {
            puts(name);
            continue;
        }
        cmd[0] = name;
        ret = spawn_and_wait(cmd);
        if (ret == 0)
            continue;
        n = 1;
        if (ret < 0)
            bb_perror_msg("can't execute '%s'", name);
        else /* ret > 0 */
            bb_error_msg("%s exited with code %d", name, ret & 0xff);
    }

    return n;
}