Bug#80810: apt: support for "apt-get source foo=1.0-1"

[Ben Collins <bcollins@debian.org>]

Package: apt
Version: 0.4.0 (cvs)

This is against current CVS. I made the DoSource able to get exact
versions. This will be especially useful with pools, and multi release
deb-src lines.

Attached is the fairly simple patch. Works well for me.

-- 
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/  Ben Collins  --  ...on that fantastic voyage...  --  Debian GNU/Linux   \
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Index: apt-get.cc
===================================================================
RCS file: /cvs/deity/apt/cmdline/apt-get.cc,v
retrieving revision 1.97.2.30
diff -u -u -r1.97.2.30 apt-get.cc
--- apt-get.cc	2000/12/19 05:21:08	1.97.2.30
+++ apt-get.cc	2000/12/29 04:52:34
@@ -1006,6 +1006,17 @@
 			       pkgSrcRecords &SrcRecs,string &Src,
 			       pkgDepCache &Cache)
 {
+   char *TmpName = strdup(Name);
+   char *VerTag = strchr(TmpName,'=');
+   if (VerTag != 0)
+      *(VerTag++) = 0;
+   else
+   {
+      VerTag = strchr(TmpName,'_'); // For sbuild compat
+      if (VerTag != 0)
+	 *(VerTag++) = 0;
+   }
+
    /* Lookup the version of the package we would install if we were to
       install a version and determine the source package name, then look
       in the archive for a source package of the same name. In theory
@@ -1013,7 +1024,7 @@
       today there aren't multi source versions in the archive. */
    if (_config->FindB("APT::Get::Only-Source") == false)
    {
-      pkgCache::PkgIterator Pkg = Cache.FindPkg(Name);
+      pkgCache::PkgIterator Pkg = Cache.FindPkg(TmpName);
       if (Pkg.end() == false)
       {
 	 pkgCache::VerIterator Ver = Cache.GetCandidateVer(Pkg);      
@@ -1027,7 +1038,7 @@
    
    // No source package name..
    if (Src.empty() == true)
-      Src = Name;
+      Src = TmpName;
    
    // The best hit
    pkgSrcRecords::Parser *Last = 0;
@@ -1045,7 +1056,23 @@
       // Skip name mismatches
       if (IsMatch == true && Parse->Package() != Src)
 	 continue;
-      
+
+      // If a version was specified, match it
+      if (VerTag != 0)
+      {
+	 if (Parse->Package() == Src &&
+	     Cache.VS().CmpVersion(VerTag,Ver) == 0)
+	 {
+	    Last = Parse;
+	    Offset = Parse->Offset();
+	    break;
+	 }
+	 else
+	 {
+	    continue;
+	 }
+      }
+
       // Newer version or an exact match
       if (Last == 0 || Cache.VS().CmpVersion(Version,Ver) < 0 || 
 	  (Parse->Package() == Src && IsMatch == false))
@@ -1056,6 +1083,8 @@
 	 Version = Ver;
       }      
    }
+
+   free(TmpName);
    
    if (Last == 0)
       return 0;