apt-pkg/versionmatch.cc

   1 // -*- mode: cpp; mode: fold -*-
   2 // Description                                                          /*{{{*/
   3 // $Id: versionmatch.cc,v 1.9 2003/05/19 17:58:26 doogie Exp $
   4 /* ######################################################################
   5
   6    Version Matching
   7
   8    This module takes a matching string and a type and locates the version
   9    record that satisfies the constraint described by the matching string.
  10
  11    ##################################################################### */
  12                                                                         /*}}}*/
  13 // Include Files                                                        /*{{{*/
  14 #include<config.h>
  15
  16 #include <apt-pkg/versionmatch.h>
  17 #include <apt-pkg/strutl.h>
  18 #include <apt-pkg/error.h>
  19 #include <apt-pkg/pkgcache.h>
  20 #include <apt-pkg/cacheiterators.h>
  21
  22 #include <stddef.h>
  23 #include <stdlib.h>
  24 #include <string.h>
  25 #include <string>
  26 #include <stdio.h>
  27 #include <ctype.h>
  28 #include <fnmatch.h>
  29 #include <regex.h>
  30                                                                         /*}}}*/
  31
  32 using std::string;
  33
  34 // VersionMatch::pkgVersionMatch - Constructor                          /*{{{*/
  35 // ---------------------------------------------------------------------
  36 /* Break up the data string according to the selected type */
  37 pkgVersionMatch::pkgVersionMatch(string Data,MatchType Type) : Type(Type)
  38 {
  39    MatchAll = false;
  40    VerPrefixMatch = false;
  41    RelVerPrefixMatch = false;
  42
  43    if (Type == None || Data.length() < 1)
  44       return;
  45
  46    // Cut up the version representation
  47    if (Type == Version)
  48    {
  49       if (Data.end()[-1] == '*')
  50       {
  51          VerPrefixMatch = true;
  52          VerStr = string(Data,0,Data.length()-1);
  53       }
  54       else
  55          VerStr = Data;
  56       return;
  57    }
  58
  59    if (Type == Release)
  60    {
  61       // All empty = match all
  62       if (Data == "*")
  63       {
  64          MatchAll = true;
  65          return;
  66       }
  67
  68       // Are we a simple specification?
  69       string::const_iterator I = Data.begin();
  70       for (; I != Data.end() && *I != '='; ++I);
  71       if (I == Data.end())
  72       {
  73          // Temporary
  74          if (isdigit(Data[0]))
  75             RelVerStr = Data;
  76          else
  77             RelRelease = Data;
  78
  79          if (RelVerStr.length() > 0 && RelVerStr.end()[-1] == '*')
  80          {
  81             RelVerPrefixMatch = true;
  82             RelVerStr = string(RelVerStr.begin(),RelVerStr.end()-1);
  83          }
  84          return;
  85       }
  86
  87       char Spec[300];
  88       char *Fragments[20];
  89       snprintf(Spec,sizeof(Spec),"%s",Data.c_str());
  90       if (TokSplitString(',',Spec,Fragments,
  91                          sizeof(Fragments)/sizeof(Fragments[0])) == false)
  92       {
  93          Type = None;
  94          return;
  95       }
  96
  97       for (unsigned J = 0; Fragments[J] != 0; J++)
  98       {
  99          if (strlen(Fragments[J]) < 3)
 100             continue;
 101
 102          if (stringcasecmp(Fragments[J],Fragments[J]+2,"v=") == 0)
 103             RelVerStr = Fragments[J]+2;
 104          else if (stringcasecmp(Fragments[J],Fragments[J]+2,"o=") == 0)
 105             RelOrigin = Fragments[J]+2;
 106          else if (stringcasecmp(Fragments[J],Fragments[J]+2,"a=") == 0)
 107             RelArchive = Fragments[J]+2;
 108          else if (stringcasecmp(Fragments[J],Fragments[J]+2,"n=") == 0)
 109             RelCodename = Fragments[J]+2;
 110          else if (stringcasecmp(Fragments[J],Fragments[J]+2,"l=") == 0)
 111             RelLabel = Fragments[J]+2;
 112          else if (stringcasecmp(Fragments[J],Fragments[J]+2,"c=") == 0)
 113             RelComponent = Fragments[J]+2;
 114          else if (stringcasecmp(Fragments[J],Fragments[J]+2,"b=") == 0)
 115             RelArchitecture = Fragments[J]+2;
 116       }
 117
 118       if (RelVerStr.end()[-1] == '*')
 119       {
 120          RelVerPrefixMatch = true;
 121          RelVerStr = string(RelVerStr.begin(),RelVerStr.end()-1);
 122       }
 123       return;
 124    }
 125
 126    if (Type == Origin)
 127    {
 128       if (Data[0] == '"' && Data.length() >= 2 && Data.end()[-1] == '"')
 129          OrSite = Data.substr(1, Data.length() - 2);
 130       else
 131          OrSite = Data;
 132       return;
 133    }
 134 }
 135                                                                         /*}}}*/
 136 // VersionMatch::MatchVer - Match a version string with prefixing       /*{{{*/
 137 // ---------------------------------------------------------------------
 138 /* */
 139 bool pkgVersionMatch::MatchVer(const char *A,string B,bool Prefix)
 140 {
 141    const char *Ab = A;
 142    const char *Ae = Ab + strlen(A);
 143
 144    // Strings are not a compatible size.
 145    if (((unsigned)(Ae - Ab) != B.length() && Prefix == false) ||
 146        (unsigned)(Ae - Ab) < B.length())
 147       return false;
 148
 149    // Match (leading?)
 150    if (stringcasecmp(B,Ab,Ab + B.length()) == 0)
 151       return true;
 152
 153    return false;
 154 }
 155                                                                         /*}}}*/
 156 // VersionMatch::Find - Locate the best match for the select type       /*{{{*/
 157 // ---------------------------------------------------------------------
 158 /* */
 159 pkgCache::VerIterator pkgVersionMatch::Find(pkgCache::PkgIterator Pkg)
 160 {
 161    pkgCache::VerIterator Ver = Pkg.VersionList();
 162    for (; Ver.end() == false; ++Ver)
 163    {
 164       if (Type == Version)
 165       {
 166          if (MatchVer(Ver.VerStr(),VerStr,VerPrefixMatch) == true)
 167             return Ver;
 168          if (ExpressionMatches(VerStr, Ver.VerStr()) == true)
 169             return Ver;
 170          continue;
 171       }
 172
 173       for (pkgCache::VerFileIterator VF = Ver.FileList(); VF.end() == false; ++VF)
 174          if (FileMatch(VF.File()) == true)
 175             return Ver;
 176    }
 177
 178    // This will be Ended by now.
 179    return Ver;
 180 }
 181
 182 #ifndef FNM_CASEFOLD
 183 #define FNM_CASEFOLD 0
 184 #endif
 185
 186 bool pkgVersionMatch::ExpressionMatches(const char *pattern, const char *string)
 187 {
 188    if (pattern[0] == '/') {
 189       size_t length = strlen(pattern);
 190       if (pattern[length - 1] == '/') {
 191          bool res = false;
 192          regex_t preg;
 193          char *regex = strdup(pattern + 1);
 194          regex[length - 2] = '\0';
 195          if (regcomp(&preg, regex, REG_EXTENDED | REG_ICASE) != 0) {
 196             _error->Warning("Invalid regular expression: %s", regex);
 197          } else if (regexec(&preg, string, 0, NULL, 0) == 0) {
 198             res = true;
 199          }
 200          free(regex);
 201          regfree(&preg);
 202          return res;
 203       }
 204    }
 205    return fnmatch(pattern, string, FNM_CASEFOLD) == 0;
 206 }
 207 bool pkgVersionMatch::ExpressionMatches(const std::string& pattern, const char *string)
 208 {
 209     return ExpressionMatches(pattern.c_str(), string);
 210 }
 211                                                                         /*}}}*/
 212 // VersionMatch::FileMatch - Match against an index file                /*{{{*/
 213 // ---------------------------------------------------------------------
 214 /* This matcher checks against the release file and the origin location
 215    to see if the constraints are met. */
 216 bool pkgVersionMatch::FileMatch(pkgCache::PkgFileIterator File)
 217 {
 218    if (Type == Release)
 219    {
 220       if (MatchAll == true)
 221          return true;
 222
 223 /*      cout << RelVerStr << ',' << RelOrigin << ',' << RelArchive << ',' << RelLabel << endl;
 224       cout << File.Version() << ',' << File.Origin() << ',' << File.Archive() << ',' << File.Label() << endl;*/
 225
 226       if (RelVerStr.empty() == true && RelOrigin.empty() == true &&
 227           RelArchive.empty() == true && RelLabel.empty() == true &&
 228           RelRelease.empty() == true && RelCodename.empty() == true &&
 229           RelComponent.empty() == true && RelArchitecture.empty() == true)
 230          return false;
 231
 232       if (RelVerStr.empty() == false)
 233          if (File->Version == 0 ||
 234              (MatchVer(File.Version(),RelVerStr,RelVerPrefixMatch) == false &&
 235               ExpressionMatches(RelVerStr, File.Version()) == false))
 236             return false;
 237       if (RelOrigin.empty() == false)
 238          if (File->Origin == 0 || !ExpressionMatches(RelOrigin,File.Origin()))
 239             return false;
 240       if (RelArchive.empty() == false)
 241          if (File->Archive == 0 ||
 242              !ExpressionMatches(RelArchive,File.Archive()))
 243             return false;
 244       if (RelCodename.empty() == false)
 245          if (File->Codename == 0 ||
 246              !ExpressionMatches(RelCodename,File.Codename()))
 247             return false;
 248       if (RelRelease.empty() == false)
 249          if ((File->Archive == 0 ||
 250              !ExpressionMatches(RelRelease,File.Archive())) &&
 251              (File->Codename == 0 ||
 252               !ExpressionMatches(RelRelease,File.Codename())))
 253                return false;
 254       if (RelLabel.empty() == false)
 255          if (File->Label == 0 ||
 256              !ExpressionMatches(RelLabel,File.Label()))
 257             return false;
 258       if (RelComponent.empty() == false)
 259          if (File->Component == 0 ||
 260              !ExpressionMatches(RelComponent,File.Component()))
 261             return false;
 262       if (RelArchitecture.empty() == false)
 263          if (File->Architecture == 0 ||
 264              !ExpressionMatches(RelArchitecture,File.Architecture()))
 265             return false;
 266       return true;
 267    }
 268
 269    if (Type == Origin)
 270    {
 271       if (OrSite.empty() == false) {
 272          if (File->Site == 0)
 273             return false;
 274       } else // so we are talking about file:// or status file
 275          if (strcmp(File.Site(),"") == 0 && File->Archive != 0 && strcmp(File.Archive(),"now") == 0) // skip the status file
 276             return false;
 277       return (ExpressionMatches(OrSite, File.Site())); /* both strings match */
 278    }
 279
 280    return false;
 281 }
 282                                                                         /*}}}*/