From bdda60d6fb5a915380398b40b0c4777c4e51850d Mon Sep 17 00:00:00 2001
From: Ishan Jayawardena <udeshike@gmail.com>
Date: Tue, 31 May 2011 22:05:29 +0530
Subject: added the debdelta method - initial implementation

---
 methods/debdelta.cc | 139 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 139 insertions(+)
 create mode 100644 methods/debdelta.cc

(limited to 'methods')

diff --git a/methods/debdelta.cc b/methods/debdelta.cc
new file mode 100644
index 000000000..96a1d7f80
--- /dev/null
+++ b/methods/debdelta.cc
@@ -0,0 +1,139 @@
+// Includes									/*{{{*/
+#include <apt-pkg/fileutl.h>
+#include <apt-pkg/mmap.h>
+#include <apt-pkg/error.h>
+#include <apt-pkg/acquire-method.h>
+#include <apt-pkg/strutl.h>
+#include <apt-pkg/hashes.h>
+
+#include <sys/stat.h>
+#include <sys/uio.h>
+#include <unistd.h>
+#include <utime.h>
+#include <stdio.h>
+#include <errno.h>
+#include <zlib.h>
+#include <apti18n.h>
+
+/*}}}*/
+/** \brief DebdeltaMethod - TODO: say something about debdelta here!
+ * */
+class DebdeltaMethod : public pkgAcqMethod {
+   bool Debug;  
+
+protected:
+   // the main(i.e. most important) method of the debdelta method.
+   virtual bool Fetch(FetchItem *Itm);
+public:
+   DebdeltaMethod() : pkgAcqMethod("1.1", SingleInstance | SendConfig) {};
+   string GetNewPackageName(string debdeltaName);
+};
+
+bool DebdeltaMethod::Fetch(FetchItem *Itm)						/*{{{*/
+{
+   std::cerr << "Starting DebdeltaMethod::Fetch()." << std::endl;
+   Debug = false;//_config->FindB("Debug::pkgAcquire::RRed", false);
+   string oldDebFile = Itm->DestFile;
+   string debDeltaFile = Itm->Uri;
+   
+   if (debDeltaFile.empty())
+      return _error->Error("Could not find a debdelta file.");
+   Itm->DestFile = GetNewPackageName(debDeltaFile);
+
+   pid_t Process = ExecFork();      
+   if (Process == 0)
+   {
+      const char* Args[6] = {0};
+      Args[0] = "/usr/bin/debpatch";
+      if (!FileExists(Args[0]))
+	 return _error->Error("Could not find debpatch.");
+      Args[1] = "-A";
+      Args[2] = debDeltaFile.c_str();
+      if (oldDebFile.empty())
+         Args[3] = "/";
+      else
+         Args[3] = oldDebFile.c_str();
+      Args[4] = Itm->DestFile.c_str();
+      if (Debug == true)
+      {
+	 std::cerr << "Debdelta command:" << std::endl;
+	 std::cerr << Args[0] << " " << Args[1] << " " << Args[2] << " " << Args[3] << " "
+                   << Args[4] << std::endl;
+      }
+      execv(Args[0], (char **)Args);
+   }
+   return ExecWait(Process, "debpatch");
+}
+
+/**
+ * \brief Receives a debdelta file name in the form of path/P_O_N_A.debdelta and constructs the name
+ * of the deb with the newer version.
+ * @param debdeltaName the name of the debdelta file.
+ * @return path/P_N_A.deb
+ */
+string DebdeltaMethod::GetNewPackageName(string debdeltaName)
+{
+   int slashpos = debdeltaName.rfind("/", debdeltaName.length() - 1);
+   string path = debdeltaName.substr(0, slashpos + 1);
+   debdeltaName = debdeltaName.substr(slashpos + 1, debdeltaName.length() - 1);
+   int newBegin = debdeltaName.find("_", 0);
+   string pckgName = debdeltaName.substr(0, newBegin); 
+   newBegin = debdeltaName.find("_", newBegin + 1);
+   int newEnd = debdeltaName.find("_", newBegin + 1);
+   string newVersion = debdeltaName.substr(newBegin + 1, newEnd - newBegin - 1);
+   string arch = debdeltaName.substr(newEnd + 1, debdeltaName.find(".", newEnd + 1) - newEnd - 1);
+   string debname = pckgName + "_" + newVersion + "_" + arch + ".deb";
+   return path+debname;
+}
+
+/*}}}*/
+/** \brief Wrapper class for testing debdelta */					/*{{{*/
+class TestDebdeltaMethod : public DebdeltaMethod {
+public:
+   /** \brief Run debdelta in debug test mode
+    *
+    *  This method can be used to run the debdelta method outside
+    *  of the "normal" acquire environment for easier testing.
+    *
+    *  \param base basename of all files involved in this debdelta test
+    */
+   bool Run(char const *debFile, char const *debdeltaFile)
+   {
+      //_config->CndSet("Debug::pkgAcquire::RRed", "true");
+      FetchItem *test = new FetchItem;
+      test->DestFile = debFile;
+      test->Uri = debdeltaFile;
+      test->FailIgnore = false;
+      test->IndexFile = false;
+      test->Next = 0;
+      return Fetch(test);
+   }
+};
+
+/*}}}*/
+/** \brief Starter for the debdelta method (or its test method)			{{{
+ *
+ *  Used without parameters is the normal behavior for methods for
+ *  the APT acquire system. While this works great for the acquire system
+ *  it is very hard to test the method and therefore the method also
+ *  accepts one parameter which will switch it directly to debug test mode:
+ */
+int main(int argc, char *argv[])
+{
+   // /home/ishan/devel/apt/testrepo/testitems/cpp-4.6_4.6.0-2_amd64.deb
+   // /home/ishan/devel/apt/testrepo/testitems/cpp-4.6_4.6.0-2_4.6.0-7_amd64.debdelta
+   if (argc <= 1)
+   {
+      DebdeltaMethod Mth;
+      return Mth.Run();
+   }
+   else
+   {
+      TestDebdeltaMethod Mth;
+      bool result = Mth.Run(argv[1], argv[2]);
+      _error->DumpErrors();
+      return result;
+   }
+}
+/*}}}*/
+
-- 
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