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Add the run-parts applet submitted by Emanuele Aina

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<emanuele.aina@tiscali.it>
This commit is contained in:
Eric Andersen 2001-10-31 10:59:29 +00:00
parent eaecbf33f7
commit 7d6829096d
1 changed files with 294 additions and 0 deletions
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init/run_parts.c Normal file
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/* vi: set sw=4 ts=4: */
/*
* Mini run-parts implementation for busybox
*
*
* 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>
*
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
* 02111-1307 USA
*
*/
/* 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 a 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. */
/* TODO
* done - convert calls to error in perror... and remove error()
* done - convert malloc/realloc to their x... counterparts
* done - remove catch_sigchld
* use bb's isdirectory() ? It seems that no applet use it.
* done - use bb's concat_path_file()
* declare run_parts_main() as extern and any other function as static? */
#include <stdio.h>
#include <stdarg.h>
#include <stdlib.h>
/* #include <sys/types.h> */
#include <sys/wait.h>
#include <dirent.h>
#include <sys/stat.h>
#include <unistd.h>
#include <getopt.h>
#include <string.h>
#include <errno.h>
#include <ctype.h>
/* #include <signal.h>
#include <sys/time.h> */
#include "busybox.h"
int test_mode = 0;
int verbose_mode = 0;
int exitstatus = 0;
int argcount = 0, argsize = 0;
char **args = 0;
/* set_umask */
/* Check and set the umask of the program executed. As stated in the original
* run-parts, the octal conversion in libc is not foolproof; it will take the
* 8 and 9 digits under some circumstances. We'll just have to live with it.
*/
void set_umask (void)
{
int mask, result;
/*TODO
* We must substitute sscanf, according to bb's style guide? */
result = sscanf (optarg, "%o", &mask);
if ((result != 1) || (mask > 07777) || (mask < 0)) {
perror_msg_and_die ("bad umask value");
}
umask (mask);
}
/* add_argument */
/* Add an argument to the commands that we will call. Called once for
every argument. */
void add_argument (char *newarg)
{
if (argcount+1 >= argsize) {
argsize = argsize ? argsize*2 : 4;
/*TODO if we convert to xrealloc we lose the verbose error message */
args = realloc(args, argsize * (sizeof(char*)));
if (!args) {
perror_msg_and_die ("failed to reallocate memory for arguments: %s", strerror(errno));
}
}
args[argcount++] = newarg;
args[argcount] = 0;
}
/* valid_name */
/* True or false? Is this a valid filename (upper/lower alpha, digits,
* underscores, and hyphens only?)
*/
int valid_name (const struct dirent *d)
{
char *c = d->d_name;
while (*c) {
if (!isalnum(*c) && *c!='_' && *c!='-') {
return 0;
}
++c;
}
return 1;
}
/* run_part */
/* Execute a file */
void run_part (char *progname)
{
int result;
int pid;
if ((pid=fork()) < 0) {
perror_msg_and_die ("failed to fork: %s", strerror(errno));
}
else if (!pid) {
args[0] = progname;
execv (progname, args);
perror_msg_and_die ("failed to exec %s: %s", progname, strerror (errno));
}
if (0) {
} else {
waitpid(pid, &result, 0);
}
if (WIFEXITED (result) && WEXITSTATUS(result)) {
perror_msg ("%s exited with return code %d", progname, WEXITSTATUS(result));
exitstatus = 1;
}
else if (WIFSIGNALED (result)) {
perror_msg ("%s exited because of uncaught signal %d", progname,
WTERMSIG(result));
exitstatus = 1;
}
}
/* run_parts */
/* Find the parts to run & call run_part() */
void run_parts (char *dir_name)
{
struct dirent **namelist;
char *filename = NULL;
size_t filename_length, dir_name_length;
int entries, i, result;
struct stat st;
/* dir_name + "/" */
dir_name_length = strlen(dir_name) + 1;
/* dir_name + "/" + ".." + "\0" (This will save one realloc.) */
filename_length = dir_name_length + 2 + 1;
/* --
* Removed this part because I want try to use concat_path_file() */
/* if (! (filename = malloc(filename_length))) {
error ("failed to allocate memory for path: %s", strerror(errno));
exit (1);
} */
/* -- */
/* scandir() isn't POSIX, but it makes things easy. */
entries = scandir (dir_name, &namelist, valid_name, alphasort);
if (entries < 0) {
perror_msg_and_die ("failed to open directory %s: %s", dir_name, strerror (errno));
}
for (i = 0; i < entries; i++) {
/* --
* Removed this part because I want try to use concat_path_file() */
/* if (filename_length < dir_name_length + strlen(namelist[i]->d_name) + 1) {
filename_length = dir_name_length + strlen(namelist[i]->d_name) + 1;
if (!(filename = realloc(filename, filename_length))) {
error ("failed to reallocate memory for path: %s", strerror(errno));
exit (1);
}
}
*/
/* -- */
/* --
* Removed for concat_path_file() */
/* strcpy (filename, dir_name);
strcat (filename, "/");
strcat (filename, namelist[i]->d_name); */
/* -- */
filename = concat_path_file (dir_name, namelist[i]->d_name);
result = stat (filename, &st);
if (result < 0) {
perror_msg_and_die ("failed to stat component %s: %s", filename,
strerror (errno));
}
if (S_ISREG(st.st_mode) && !access (filename, X_OK)) {
if (test_mode)
printf ("run-parts would run %s\n", filename);
else {
run_part (filename);
}
}
/*TODO convert to isdirectory() */
else if (!S_ISDIR(st.st_mode)) {
printf ("run-parts: component %s is not an executable plain file\n",
filename);
exitstatus = 1;
}
free (namelist[i]);
}
free (namelist);
free (filename);
}
/* run_parts_main */
/* Process options */
int run_parts_main (int argc, char *argv[])
{
umask (022);
add_argument(0);
for (;;) {
int c;
opterr = 0;
c = getopt(argc, argv, "tu:a:");
if (c == EOF)
break;
switch (c) {
case 't': /* Enable test mode */
test_mode = 1;
break;
case 'u': /* Set the umask of the programs executed */
set_umask ();
break;
case 'a': /* Pass an argument to the programs */
add_argument (optarg);
break;
default:
show_usage();
}
}
/* We require exactly one argument: the directory name */
if (optind != (argc - 1)) {
show_usage();
}
run_parts (argv[optind]);
return exitstatus;
}