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setpreroot.c

/***********************************************************************
*                                                                      *
*               This software is part of the ast package               *
*                  Copyright (c) 1985-2005 AT&T Corp.                  *
*                      and is licensed under the                       *
*                  Common Public License, Version 1.0                  *
*                            by AT&T Corp.                             *
*                                                                      *
*                A copy of the License is available at                 *
*            http://www.opensource.org/licenses/cpl1.0.txt             *
*         (with md5 checksum 059e8cd6165cb4c31e351f2b69388fd9)         *
*                                                                      *
*              Information and Software Systems Research               *
*                            AT&T Research                             *
*                           Florham Park NJ                            *
*                                                                      *
*                 Glenn Fowler <gsf@research.att.com>                  *
*                  David Korn <dgk@research.att.com>                   *
*                   Phong Vo <kpv@research.att.com>                    *
*                                                                      *
***********************************************************************/
#pragma prototyped
/*
 * AT&T Bell Laboratories
 * force current command to run under dir preroot
 */

#include <ast.h>
#include <preroot.h>

#if FS_PREROOT

#include <option.h>

void
setpreroot(register char** argv, const char* dir)
{
      register char*    s;
      register char**   ap;
      int         argc;
      char*       cmd;
      char**            av;
      char        buf[PATH_MAX];

      if ((argv || (argv = opt_info.argv)) && (dir || (dir = getenv(PR_BASE)) && *dir) && !ispreroot(dir) && (*(cmd = *argv++) == '/' || (cmd = pathpath(buf, cmd, NiL, PATH_ABSOLUTE|PATH_REGULAR|PATH_EXECUTE))))
      {
            argc = 3;
            for (ap = argv; *ap++; argc++);
            if (av = newof(0, char*, argc, 0))
            {
                  ap = av;
                  *ap++ = PR_COMMAND;
                  *ap++ = dir;
                  *ap++ = cmd;
                  while (*ap++ = *argv++);
                  if (!(s = getenv(PR_SILENT)) || !*s)
                  {
                        sfprintf(sfstderr, "+");
                        ap = av;
                        while (s = *ap++)
                              sfprintf(sfstderr, " %s", s);
                        sfprintf(sfstderr, "\n");
                        sfsync(sfstderr);
                  }
                  execv(*av, av);
                  free(av);
            }
      }
}

#else

NoN(setpreroot)

#endif

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