vshost-util-vserver

Build script and sources for util-vserver.
git clone https://ccx.te2000.cz/git/vshost-util-vserver
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getvserverbyctx-compat.hc (2850B)

      1 // $Id$    --*- c -*--
      2 
      3 // Copyright (C) 2003 Enrico Scholz <enrico.scholz@informatik.tu-chemnitz.de>
      4 //  
      5 // This program is free software; you can redistribute it and/or modify
      6 // it under the terms of the GNU General Public License as published by
      7 // the Free Software Foundation; version 2 of the License.
      8 //  
      9 // This program is distributed in the hope that it will be useful,
     10 // but WITHOUT ANY WARRANTY; without even the implied warranty of
     11 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
     12 // GNU General Public License for more details.
     13 //  
     14 // You should have received a copy of the GNU General Public License
     15 // along with this program; if not, write to the Free Software
     16 // Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
     17 
     18 
     19 #ifdef HAVE_CONFIG_H
     20 #  include <config.h>
     21 #endif
     22 
     23 #include "vserver.h"
     24 #include "internal.h"
     25 #include "pathconfig.h"
     26 #include "compat-c99.h"
     27 
     28 #include <string.h>
     29 #include <unistd.h>
     30 
     31 #ifdef VC_ENABLE_API_COMPAT
     32 #include <dirent.h>
     33 #include <sys/types.h>
     34 
     35 
     36 static char *
     37 handleLegacy(xid_t xid)
     38 {
     39   DIR			*dir = opendir(DEFAULT_PKGSTATEDIR);
     40   struct dirent		*ep;
     41   char *		result = 0;
     42   
     43   if (dir==0) return 0;
     44   while ((ep=readdir(dir))!=0) {
     45     char * const		name = ep->d_name;
     46     size_t			l    = name ? strlen(name) : 0;
     47     xid_t			cur_xid;
     48 
     49     if (l<=4 || strcmp(name+l-4, ".ctx")!=0) continue;
     50     name[l-4]   = '\0';
     51     cur_xid = vc_getVserverCtx(name, vcCFG_LEGACY, false, 0, vcCTX_XID);
     52     if (cur_xid!=xid) continue;
     53 
     54     result      = strdup(name);
     55     break;
     56   }
     57 
     58   closedir(dir);
     59   return result;
     60 }
     61 #else
     62 static inline char *
     63 handleLegacy(xid_t UNUSED xid)
     64 {
     65   return 0;
     66 }
     67 #endif
     68 
     69 static char *
     70 vc_getVserverByCtx_compat(xid_t ctx, vcCfgStyle *style, char const *revdir,
     71 			  bool validate_result)
     72 {
     73   if (revdir==0) revdir = DEFAULT_PKGSTATEREVDIR;
     74 
     75   {
     76   vcCfgStyle	cur_style = vcCFG_NONE;
     77   size_t	l = strlen(revdir);
     78   size_t	l1;
     79   char		path[l + sizeof(unsigned int)*3 + 3];
     80 
     81   strcpy(path, revdir);
     82   path[l]      = '/';
     83   l1 = utilvserver_fmt_uint(path+l+1, ctx);
     84   path[l+1+l1] = '\0';
     85 
     86   if (style==0 || *style==vcCFG_AUTO) {
     87     if (access(path, F_OK)==0) cur_style = vcCFG_RECENT_FULL;
     88     else                       cur_style = vcCFG_LEGACY;
     89   }
     90   else
     91     cur_style = *style;
     92 
     93   switch (cur_style) {
     94     case vcCFG_RECENT_SHORT	:
     95     case vcCFG_RECENT_FULL	:
     96 	// check if expected ctx == actual ctx (but only when this check is
     97 	// request)
     98       if (validate_result &&
     99 	  vc_getVserverCtx(path, vcCFG_RECENT_FULL, false, 0, vcCTX_XID)!=ctx) return 0;
    100 
    101       if (style) *style = vcCFG_RECENT_FULL;
    102       return strdup(path);
    103 	// TODO: handle legacy
    104     case vcCFG_LEGACY		:
    105     {
    106       char *	tmp = handleLegacy(ctx);
    107       if (tmp && style)
    108 	*style = vcCFG_LEGACY;
    109 
    110       return tmp;
    111     }
    112       
    113     default		:
    114       return 0;
    115   }
    116   }
    117 }