usr/src/lib/libast/common/preroot/setpreroot.c

   1 /***********************************************************************
   2 *                                                                      *
   3 *               This software is part of the ast package               *
   4 *          Copyright (c) 1985-2010 AT&T Intellectual Property          *
   5 *                      and is licensed under the                       *
   6 *                  Common Public License, Version 1.0                  *
   7 *                    by AT&T Intellectual Property                     *
   8 *                                                                      *
   9 *                A copy of the License is available at                 *
  10 *            http://www.opensource.org/licenses/cpl1.0.txt             *
  11 *         (with md5 checksum 059e8cd6165cb4c31e351f2b69388fd9)         *
  12 *                                                                      *
  13 *              Information and Software Systems Research               *
  14 *                            AT&T Research                             *
  15 *                           Florham Park NJ                            *
  16 *                                                                      *
  17 *                 Glenn Fowler <gsf@research.att.com>                  *
  18 *                  David Korn <dgk@research.att.com>                   *
  19 *                   Phong Vo <kpv@research.att.com>                    *
  20 *                                                                      *
  21 ***********************************************************************/
  22 #pragma prototyped
  23 /*
  24  * AT&T Bell Laboratories
  25  * force current command to run under dir preroot
  26  */
  27
  28 #include <ast.h>
  29 #include <preroot.h>
  30
  31 #if FS_PREROOT
  32
  33 #include <option.h>
  34
  35 void
  36 setpreroot(register char** argv, const char* dir)
  37 {
  38         register char*  s;
  39         register char** ap;
  40         int             argc;
  41         char*           cmd;
  42         char**          av;
  43         char            buf[PATH_MAX];
  44
  45         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))))
  46         {
  47                 argc = 3;
  48                 for (ap = argv; *ap++; argc++);
  49                 if (av = newof(0, char*, argc, 0))
  50                 {
  51                         ap = av;
  52                         *ap++ = PR_COMMAND;
  53                         *ap++ = dir;
  54                         *ap++ = cmd;
  55                         while (*ap++ = *argv++);
  56                         if (!(s = getenv(PR_SILENT)) || !*s)
  57                         {
  58                                 sfprintf(sfstderr, "+");
  59                                 ap = av;
  60                                 while (s = *ap++)
  61                                         sfprintf(sfstderr, " %s", s);
  62                                 sfprintf(sfstderr, "\n");
  63                                 sfsync(sfstderr);
  64                         }
  65                         execv(*av, av);
  66                         free(av);
  67                 }
  68         }
  69 }
  70
  71 #else
  72
  73 NoN(setpreroot)
  74
  75 #endif