> On 03 Aug 2017, at 10:18, Christian Couder <christian.couder@xxxxxxxxx> wrote: > > ... > > * The "helpers" (registered commands) > > Each helper manages access to one external ODB. > > There are 2 different modes for helper: > > - Helpers configured using "odb.<odbname>.scriptCommand" are > launched each time Git wants to communicate with the <odbname> > external ODB. This is called "script mode". > > - Helpers configured using "odb.<odbname>.subprocessCommand" are > launched launched once as a sub-process (using sub-process.h), and > Git communicates with them using packet lines. This is called > "process mode". I am curious, why would we support two modes? Wouldn't that increase the maintenance cost? Wouldn't the subprocess command be superior? I imagine the script mode eases testing, right?! > ... > > These odb refs point to a blob that is stored in the Git > repository and contain information about the blob stored in the > external odb. This information can be specific to the external odb. > The repos can then share this information using commands like: > > `git fetch origin "refs/odbs/<odbname>/*:refs/odbs/<odbname>/*"` > > At the end of the current patch series, "git clone" is teached a > "--initial-refspec" option, that asks it to first fetch some specified > refs. This is used in the tests to fetch the odb refs first. > > This way only one "git clone" command can setup a repo using the > external ODB mechanism as long as the right helper is installed on the > machine and as long as the following options are used: > > - "--initial-refspec <odbrefspec>" to fetch the odb refspec > - "-c odb.<odbname>.command=<helper>" to configure the helper The "odb" config could, of course, go into the global git config. The odbrefspec is optional, right? I have the impression there are a number of topics on the list that tackle the "many/big objects in a Git repo" problem. Is there a write up about the status of them, how they relate to each other, and what the current problems are? I found the following but it looks abandoned: https://github.com/jrn/git-large-repositories - Lars
