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Feb 17, 2006

  1. pack-objects: reuse data from existing packs.

    When generating a new pack, notice if we have already needed
    objects in existing packs.  If an object is stored deltified,
    and its base object is also what we are going to pack, then
    reuse the existing deltified representation unconditionally,
    bypassing all the expensive find_deltas() and try_deltas()
    calls.
    
    Also, notice if what we are going to write out exactly match
    what is already in an existing pack (either deltified or just
    compressed).  In such a case, we can just copy it instead of
    going through the usual uncompressing & recompressing cycle.
    
    Without this patch, in linux-2.6 repository with about 1500
    loose objects and a single mega pack:
    
        $ git-rev-list --objects v2.6.16-rc3 >RL
        $ wc -l RL
        184141 RL
        $ time git-pack-objects p <RL
        Generating pack...
        Done counting 184141 objects.
        Packing 184141 objects....................
        a1fc7b3
    
        real    12m4.323s
        user    11m2.560s
        sys     0m55.950s
    
    With this patch, the same input:
    
        $ time ../git.junio/git-pack-objects q <RL
        Generating pack...
        Done counting 184141 objects.
        Packing 184141 objects.....................
        a1fc7b3
        Total 184141, written 184141, reused 182441
    
        real    1m2.608s
        user    0m55.090s
        sys     0m1.830s
    
    Signed-off-by: Junio C Hamano <junkio@cox.net>
    authored February 15, 2006

Feb 10, 2006

  1. remove delta-against-self bit

    After experimenting with code to add the ability to encode a delta
    against part of the deltified file, it turns out that resulting packs
    are _bigger_ than when this ability is not used.  The raw delta output
    might be smaller, but it doesn't compress as well using gzip with a
    negative net saving on average.
    
    Said bit would in fact be more useful to allow for encoding the copying
    of chunks larger than 64KB providing more savings with large files.
    This will correspond to packs version 3.
    
    While the current code still produces packs version 2, it is made future
    proof so pack versions 2 and 3 are accepted.  Any pack version 2 are
    compatible with version 3 since the redefined bit was never used before.
    When enough time has passed, code to use that bit to produce version 3
    packs could be added.
    
    Signed-off-by: Nicolas Pitre <nico@cam.org>
    Signed-off-by: Junio C Hamano <junkio@cox.net>
    authored February 09, 2006 Junio C Hamano committed February 09, 2006

Jul 01, 2005

  1. [PATCH] verify-pack updates.

    Nico pointed out that having verify_pack.c and verify-pack.c was
    confusing.  Rename verify_pack.c to pack-check.c as suggested,
    and enhances the verification done quite a bit.
    
     - Built-in sha1_file unpacking knows that a base object of a
       deltified object _must_ be in the same pack, and takes
       advantage of that fact.
    
     - Earlier verify-pack command only checked the SHA1 sum for the
       entire pack file and did not look into its contents.  It now
       checks everything idx file claims to have unpacks correctly.
    
     - It now has a hook to give more detailed information for
       objects contained in the pack under -v flag.
    
    Signed-off-by: Junio C Hamano <junkio@cox.net>
    Signed-off-by: Linus Torvalds <torvalds@osdl.org>
    authored June 30, 2005 Linus Torvalds committed June 30, 2005

Jun 29, 2005

  1. [PATCH] Add git-verify-pack command.

    Given a list of <pack>.idx files, this command validates the
    index file and the corresponding .pack file for consistency.
    
    This patch also uses the same validation mechanism in fsck-cache
    when the --full flag is used.
    
    During normal operation, sha1_file.c verifies that a given .idx
    file matches the .pack file by comparing the SHA1 checksum
    stored in .idx file and .pack file as a minimum sanity check.
    We may further want to check the pack signature and version when
    we map the pack, but that would be a separate patch.
    
    Earlier, errors to map a pack file was not flagged fatal but led
    to a random fatal error later.  This version explicitly die()s
    when such an error is detected.
    
    Signed-off-by: Junio C Hamano <junkio@cox.net>
    Signed-off-by: Linus Torvalds <torvalds@osdl.org>
    authored June 29, 2005 Linus Torvalds committed June 29, 2005
  2. Make git pack files use little-endian size encoding

    This makes it match the new delta encoding, and admittedly makes the
    code easier to follow.
    
    This also updates the PACK file version to 2, since this (and the delta
    encoding change in the previous commit) are incompatible with the old
    format.
    authored June 28, 2005

Jun 28, 2005

  1. Change pack file format. Hopefully for the last time.

    This also adds a header with a signature, version info, and the number
    of objects to the pack file.  It also encodes the file length and type
    more efficiently.
    authored June 28, 2005
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