Package: apt-transport-https Version: 0.8.16~exp12 Tags: patch When using an https repository, apt will use libcurl to download files, setting the If-Modified-Since herder in the http request. If the server replies with a 200 OK but a Last-Modified header with a date that is not newer that the requested If-Modified-Since, libcurl drop the file, reporting an errorcode 200, but the actual downloaded file will be empty. Causing messages like W: Size of file /var/lib/apt/lists/partial/repo.server.com_dists_precise_main_binary-amd64_Packages is not what the server reported 0 25118 See the attached patch that fixes the issue. Apt needs to check the CURLINFO_CONDITION_UNMET to know if libcurl discarded the payload. Also TotalSize will get updated to the actual size of the file as progress_callback will be called with the download size even in the case libcurl decides to discard the payload. This will cause the check for the size to fail. In my patch I just disable the check if the actual size of the file is 0. Probably a better way would be adding a new header is the message from the worker stating that the file was discarded. The cases why the http server would give this kind of response are, e.g. 1) if-modified-since used like a etag header http://trac.nginx.org/nginx/ticket/93 (under this light, it might makes sense to avoid using the CURLOPT_TIMECONDITION feature and handle If-Modified-SInce as an Etag) 2) a bug in apt-cacher-ng which sometimes returns 200 OK with a Last-Modified equal to Last-Modified (about to be reported) This bug is present at least as far back as version 0.8.16~exp12 and still affects the latest in experimental (0.9.7.9~exp3). The attached patch is for 0.9.7.9~exp3. Cheers, Ludovico
Attachment:
check-time-condition.patch
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