OS-3280 need a way to specify the root of a native system in the lx brand
OS-3279 lx brand should allow delegated datasets
Reviewed by: Jerry Jelinek <jerry.jelinek@joyent.com>

*** 35,55 ****
   * University Acknowledgment- Portions of this document are derived from
   * software developed by the University of California, Berkeley, and its
   * contributors.
   */
  
- #pragma ident   "%Z%%M% %I%     %E% SMI"
- 
  /*LINTLIBRARY*/
  
  #include        <stdio.h>
  #include        <sys/types.h>
  #include        <fcntl.h>
  #include        <stdlib.h>
  #include        <string.h>
  #include        <unistd.h>
  #include        <errno.h>
  #include        "curses_inc.h"
  
  #define TERMPATH        "/usr/share/lib/terminfo/"
  #define TERMPATHLEN     512
  
--- 35,54 ----
   * University Acknowledgment- Portions of this document are derived from
   * software developed by the University of California, Berkeley, and its
   * contributors.
   */
  
  /*LINTLIBRARY*/
  
  #include        <stdio.h>
  #include        <sys/types.h>
  #include        <fcntl.h>
  #include        <stdlib.h>
  #include        <string.h>
  #include        <unistd.h>
  #include        <errno.h>
+ #include        <zone.h>
  #include        "curses_inc.h"
  
  #define TERMPATH        "/usr/share/lib/terminfo/"
  #define TERMPATHLEN     512
  
*** 270,282 ****
                  if ((tfd < 0) && (errno == EACCES))
                          goto cant_read;
          }
  
          if (tfd < 0) {
                  /* /usr/share/lib/terminfo/?/$TERM */
                  if (snprintf(fname, sizeof (fname),
!                         "%s/%c/%s", TERMPATH, *term, term) >= sizeof (fname)) {
                          term_errno = TERMINFO_TOO_LONG;
                          goto out_err;
                  }
  
                  tfd = open(fname, 0);
--- 269,283 ----
                  if ((tfd < 0) && (errno == EACCES))
                          goto cant_read;
          }
  
          if (tfd < 0) {
+                 const char *zroot = zone_get_nroot();
                  /* /usr/share/lib/terminfo/?/$TERM */
                  if (snprintf(fname, sizeof (fname),
!                         "%s/%s/%c/%s", zroot == NULL ? "" : zroot, TERMPATH,
!                         *term, term) >= sizeof (fname)) {
                          term_errno = TERMINFO_TOO_LONG;
                          goto out_err;
                  }
  
                  tfd = open(fname, 0);