From 4c49961112370b869c3c7db61793bb899c709c09 Mon Sep 17 00:00:00 2001
From: Michael Vogt <michael.vogt@ubuntu.com>
Date: Thu, 2 Aug 2007 19:23:41 +0200
Subject: [PATCH 1/1] * methods/https.cc:   - only send i-m-s if last-modified
 is > 0   - instead of resume send a range: if-range: custom header   - merge
 304 detection patch from thom may (thanks!) * apt-pkg/acquire-item.cc:   -
 remove empty files on i-m-s hits from partial/

---
 apt-pkg/acquire-item.cc | 20 +++++++++++++-------
 methods/https.cc        | 28 ++++++++++++++++++++--------
 2 files changed, 33 insertions(+), 15 deletions(-)

diff --git a/apt-pkg/acquire-item.cc b/apt-pkg/acquire-item.cc
index 8ec4ba2c0..bc6d8cead 100644
--- a/apt-pkg/acquire-item.cc
+++ b/apt-pkg/acquire-item.cc
@@ -263,8 +263,10 @@ void pkgAcqIndex::Done(string Message,unsigned long Size,string MD5,
    {
       // The files timestamp matches
       if (StringToBool(LookupTag(Message,"Alt-IMS-Hit"),false) == true)
+      {
+	 unlink(FileName.c_str());
 	 return;
-
+      }
       Decompression = true;
       Local = true;
       DestFile += ".decomp";
@@ -283,7 +285,10 @@ void pkgAcqIndex::Done(string Message,unsigned long Size,string MD5,
    
    // The files timestamp matches
    if (StringToBool(LookupTag(Message,"IMS-Hit"),false) == true)
+   {
+      unlink(FileName.c_str());
       return;
+   }
 
    if (FileName == DestFile)
       Erase = true;
@@ -520,18 +525,19 @@ void pkgAcqMetaIndex::RetrievalDone(string Message)
 
    // see if the download was a IMSHit
    IMSHit = StringToBool(LookupTag(Message,"IMS-Hit"),false);
-
    Complete = true;
 
    string FinalFile = _config->FindDir("Dir::State::lists");
    FinalFile += URItoFileName(RealURI);
 
-   // The files timestamp matches
-   if (StringToBool(LookupTag(Message,"IMS-Hit"),false) == false)
-   {
-      // Move it into position
+   // If we get a IMS hit we can remove the empty file in partial
+   // othersie we move the file in place
+   if (IMSHit)
+      unlink(DestFile.c_str());
+   else
       Rename(DestFile,FinalFile);
-   }
+
+   chmod(FinalFile.c_str(),0644);
    DestFile = FinalFile;
 }
 
diff --git a/methods/https.cc b/methods/https.cc
index b758e4ab3..7a6148d14 100644
--- a/methods/https.cc
+++ b/methods/https.cc
@@ -108,6 +108,7 @@ bool HttpsMethod::Fetch(FetchItem *Itm)
    struct stat SBuf;
    struct curl_slist *headers=NULL;  
    char curl_errorstr[CURL_ERROR_SIZE];
+   long curl_responsecode;
 
    // TODO:
    //       - http::Timeout
@@ -160,8 +161,11 @@ bool HttpsMethod::Fetch(FetchItem *Itm)
    curl_easy_setopt(curl, CURLOPT_HTTPHEADER, headers);
 
    // set time values
-   curl_easy_setopt(curl, CURLOPT_TIMECONDITION, CURL_TIMECOND_IFMODSINCE);
-   curl_easy_setopt(curl, CURLOPT_TIMEVALUE, Itm->LastModified);
+   if(Itm->LastModified > 0)
+   {
+      curl_easy_setopt(curl, CURLOPT_TIMECONDITION, CURL_TIMECOND_IFMODSINCE);
+      curl_easy_setopt(curl, CURLOPT_TIMEVALUE, Itm->LastModified);
+   }
 
    // speed limit
    int dlLimit = _config->FindI("Acquire::http::Dl-Limit",0)*1024;
@@ -179,8 +183,14 @@ bool HttpsMethod::Fetch(FetchItem *Itm)
    curl_easy_setopt(curl, CURLOPT_ERRORBUFFER, curl_errorstr);
 
    // In this case we send an if-range query with a range header
-  if (stat(Itm->DestFile.c_str(),&SBuf) >= 0 && SBuf.st_size > 0)
-     curl_easy_setopt(curl, CURLOPT_RESUME_FROM, (long)SBuf.st_size);
+   if (stat(Itm->DestFile.c_str(),&SBuf) >= 0 && SBuf.st_size > 0)
+   {
+      char Buf[1000];
+      sprintf(Buf,"Range: bytes=%li-\r\nIf-Range: %s\r\n",
+	      (long)SBuf.st_size - 1,
+	      TimeRFC1123(SBuf.st_mtime).c_str());
+      headers = curl_slist_append(headers, Buf);
+   }
 
    // go for it - if the file exists, append on it
    File = new FileFd(Itm->DestFile, FileFd::WriteAny);
@@ -191,14 +201,17 @@ bool HttpsMethod::Fetch(FetchItem *Itm)
 
    // get it!
    CURLcode success = curl_easy_perform(curl);
-
+   curl_easy_getinfo(curl, CURLINFO_RESPONSE_CODE, &curl_responsecode);
 
    // cleanup
-   if(success != 0) {
+   if(success != 0) 
+   {
+      unlink(File->Name().c_str());
       _error->Error(curl_errorstr);
       Fail();
       return true;
    }
+   File->Close();
 
    if (Res.Size == 0)
       Res.Size = File->Size();
@@ -211,7 +224,7 @@ bool HttpsMethod::Fetch(FetchItem *Itm)
       Res.Filename = File->Name();
       Res.LastModified = Buf.st_mtime;
       Res.IMSHit = false;
-      if (Itm->LastModified != 0 && Buf.st_mtime >= Itm->LastModified)
+      if (curl_responsecode == 304)
       {
 	 Res.IMSHit = true;
 	 Res.LastModified = Itm->LastModified;
@@ -228,7 +241,6 @@ bool HttpsMethod::Fetch(FetchItem *Itm)
    URIDone(Res);
 
    // cleanup
-   File->Close();
    Res.Size = 0;
    delete File;
    curl_slist_free_all(headers);
-- 
2.45.2