On Thu, Mar 9, 2023 at 8:26 PM Derrick Stolee <derrickstolee@xxxxxxxxxx> wrote: > > On 3/9/23 7:07 AM, Khalid Masum wrote: > > There is this SOC 2011 idea named "Resumable clone" here: > > > > https://archive.kernel.org/oldwiki/git.wiki.kernel.org/index.php/SoC2011Ideas.html > > > > ... > > Currently cloning a remote repository has to be done in one session. > > If the process fails or is aborted for any reason any already downloaded > > data is lost and one has to start from scratch. > > > Goal: Allow Git to resume a cloning process that > > has been aborted for any reason. > > Languages: C > > "for any reason" is going to be pretty difficult. > > One direction that is relatively new in the Git project > (much newer than that project idea) is the bundle URI > standard, allowed by "git clone --bundle-uri=<X>". It > helps bootstrap clones by fetching bundle files and using > them to populate the object directory before finishing > the clone with an incremental fetch to the origin server. > > Since the bundles are expected to be precomputed files, > it is much easier to use standard HTTP range queries to > download only the "missing" portion of the file from the > bundle server. > > I think one thing that would need to change on the Git > client is the location of the temporary file being used > to store the bundle as it is downloaded. It currently > uses a random name, but if the name was a hash of the > URL, then it would be predictable and could restart the > download if the 'git clone' process was halted for any > reason. (Resuming a download due to a network error > noticed in-process is possibly simpler.) > > This might be a more focused approach that is more > likely to have progress in a GSoC project. > > That said, I don't have the capacity to be a mentor, > but I thought it worth mentioning this variant of the > project. > > Thanks, > -Stolee Thanks for your insight. I will write a proposal based on this and hopefully get a mentor, while trying to understand how git bundle cloning works. thanks, -- Khalid Masum
