# format of git pack objects 3 messages from 2010-08-31 to 2010-08-31. Participants: Luke Kenneth Casson Leighton, Shawn O. Pearce. Thread: https://gitlist.dev/t/24927 ## Luke Kenneth Casson Leighton, 2010-08-31 23:17 Subject: format of git pack objects Message-ID: URL: https://gitlist.dev/e/AANLkTimNnUYoBa1VfZeBb%3DeD%3DHymOU_h57bthYFC9jUZ%40mail.gmail.com ``` hi folks, where can i get information (specifications) on the format of git pack-objects... please don't say "look at the source code" unless there simply doesn't exist any format specifications. as part of the git p2p bittorrent vfs layer stuff, a "file save" operation doesn't "happen by magic": i need to actually verify the pack objects received: count the number of entries? or do i? tia, l. ``` ## Shawn O. Pearce, 2010-08-31 23:19 Subject: Re: format of git pack objects Message-ID: <20100831231947.GH32601@spearce.org> URL: https://gitlist.dev/e/20100831231947.GH32601%40spearce.org In-Reply-To: ``` Luke Kenneth Casson Leighton wrote: > where can i get information (specifications) on the format of git > pack-objects... please don't say "look at the source code" unless > there simply doesn't exist any format specifications. as part of the > git p2p bittorrent vfs layer stuff, a "file save" operation doesn't > "happen by magic": i need to actually verify the pack objects > received: count the number of entries? or do i? Its in the Documentation/technical subdirectory of git.git[1]. Look at pack-format.txt. Its rather sparse though. [1] http://git.kernel.org/?p=git/git.git;a=tree;f=Documentation/technical;hb=HEAD -- Shawn. ``` ## Luke Kenneth Casson Leighton, 2010-08-31 23:22 Subject: Re: format of git pack objects Message-ID: URL: https://gitlist.dev/e/AANLkTikKavvRb-f0UFF6npQyuPaDHfxEnUFoqNCZNoZ5%40mail.gmail.com In-Reply-To: <20100831231947.GH32601@spearce.org> ``` On Wed, Sep 1, 2010 at 12:19 AM, Shawn O. Pearce wrote: > Luke Kenneth Casson Leighton wrote: >> where can i get information (specifications) on the format of git >> pack-objects... please don't say "look at the source code" unless >> there simply doesn't exist any format specifications.  as part of the >> git p2p bittorrent vfs layer stuff, a "file save" operation doesn't >> "happen by magic": i need to actually verify the pack objects >> received: count the number of entries?  or do i? > > Its in the Documentation/technical subdirectory of git.git[1]. > Look at pack-format.txt. star! thank you. > Its rather sparse though. good enough. .... ahh... ah ha! - The file is concluded with a trailer: A copy of the 20-byte SHA1 checksum at the end of corresponding packfile. 20-byte SHA1-checksum of all of the above. i believe that will suffice. ```