openrc/src/rc-depend.c

/*
   rc-depend
   rc service dependency and ordering
   Copyright 2006-2007 Gentoo Foundation
   Released under the GPLv2
   */

#include <sys/types.h>
#include <sys/stat.h>

#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#include "einfo.h"
#include "rc.h"
#include "rc-misc.h"
#include "strlist.h"

int main (int argc, char **argv)
{
  char **types = NULL;
  char **services = NULL;
  char **depends = NULL;
  rc_depinfo_t *deptree = NULL;
  rc_depinfo_t *di;
  char *service;
  int options = RC_DEP_TRACE;
  bool first = true;
  int i;
  bool update = false;
  char *runlevel = getenv ("RC_SOFTLEVEL");

  if (! runlevel)
    runlevel = rc_get_runlevel ();

  for (i = 1; i < argc; i++)
    {
      if (strcmp (argv[i], "--update") == 0)
        {
          if (! update)
            {
              rc_update_deptree (true);
              update = true;
            }
          continue;
        }

      if (strcmp (argv[i], "--strict") == 0)
        {
          options |= RC_DEP_STRICT;
          continue;
        }

      if (strcmp (argv[i], "--notrace") == 0)
        {
          options &= RC_DEP_TRACE;
          continue;
        }

      if (argv[i][0] == '-')
        {
          argv[i]++;
          types = rc_strlist_add (types, argv[i]);
        }
      else
        {
          if ((deptree = rc_load_deptree ()) == NULL)
            eerrorx ("failed to load deptree");

          di = rc_get_depinfo (deptree, argv[i]);
          if (! di)
            eerror ("no dependency info for service `%s'", argv[i]);
          else
            services = rc_strlist_add (services, argv[i]);
        }
    }

  if (! services)
    {
      rc_strlist_free (types);
      rc_free_deptree (deptree);
      if (update)
        return (EXIT_SUCCESS);
      eerrorx ("no services specified");
    }

  /* If we don't have any types, then supply some defaults */
  if (! types)
    {
      types = rc_strlist_add (NULL, "ineed");
      rc_strlist_add (types, "iuse");
    }

  depends = rc_get_depends (deptree, types, services, runlevel, options);

  if (depends)
    {
      STRLIST_FOREACH (depends, service, i)
        {
          if (first)
            first = false;
          else
            printf (" ");

          if (service)
            printf ("%s", service);

        }
      printf ("\n");
    }

  rc_strlist_free (types);
  rc_strlist_free (services);
  rc_strlist_free (depends);
  rc_free_deptree (deptree);

  return (EXIT_SUCCESS);
}