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