Add the run-parts applet submitted by Emanuele Aina

<emanuele.aina@tiscali.it>

1 files changed, 294 insertions, 0 deletions

diff --git a/init/run_parts.c b/init/run_parts.c
new file mode 100644
index 000000000..258afb4db
--- /dev/null
+++ b/init/run_parts.c
@@ -0,0 +1,294 @@
+/* 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;
+}