Junio C Hamano <[email protected]> writes:
> Note that this name choice does not matter very much in the larger
> picture. As an initial clone that bootstraps from a clone-bundle is
> expected to do a rough equivalent of:
>
> # create a new repository
> git init new-repository &&
> git remote add origin $URL &&
>
> # prime the object store and anchor the history to temporary
> # references
> git fetch $bundle 'refs/*:refs/temporary/*' &&
>
> # fetch the more recent history from the true origin
> git fetch origin &&
> git checkout -f &&
>
> # remove the temporary refs
> git for-each-ref -z --format=%(refname) refs/temporary/ |
> xargs -0 git update-ref -d
>
> the names recorded in the bundle will not really matter to the end
> result.
Actually, the real implementation of "bootstrap with clone-bundle"
is more likely to go like this:
* The client gets redirected to $name.bndl file, and obtains a
fairly full $name.pack file by downloading them as static
files;
* The client initializes an empty repository;
* The pack file is stored at .git/objects/pack/pack-$sha1.pack;
* When the client does a "git fetch origin" to fill the more
recent part, fetch-pack.c::find_common() would read from the
"git bundle list-heads $name.bndl" to learn the "reference"
objects. These are thrown at rev_list_insert_ref() and are
advertised as "have"s, just like we advertise objects at the
tip of refs in alternate repository.
So there will be no refs/temporary/* hierarchy we would need to
worry about cleaning up.
Another possible variant is to redirect the client directly to
download pack-$sha1.pack; "index-pack" needs to be run on the client
side anyway to create pack-$sha1.idx, so at that time it could do
the equivalent of "--clone-bundle" processing (it is not strictly
necessary to create a split bundle) to find the tips of histories,
and use that information when running "git fetch origin".
So, even though I started working from "split bundle", we may not
have to have such a feature after all to support CDN offloadable and
resumable clone.
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