Re: [PATCH] doc: explain why file: URLs and bundles don't mix

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Alyssa Ross <hi@xxxxxxxxx> writes:

> Signed-off-by: Alyssa Ross <hi@xxxxxxxxx>
> ---
>  Documentation/urls.txt | 20 +++++++++++++++-----
>  1 file changed, 15 insertions(+), 5 deletions(-)
>
> diff --git a/Documentation/urls.txt b/Documentation/urls.txt
> index b05da95788..c83d9f859e 100644
> --- a/Documentation/urls.txt
> +++ b/Documentation/urls.txt
> @@ -43,14 +43,24 @@ syntaxes may be used:
>  - \file:///path/to/repo.git/
>  
>  ifndef::git-clone[]
> -These two syntaxes are mostly equivalent, except when cloning, when
> -the former implies --local option. See linkgit:git-clone[1] for
> -details.
> +These two syntaxes are mostly equivalent, with some exceptions:
> +
> +- When cloning, the former implies --local option. See
> +  linkgit:git-clone[1] for details.
> +
> +- The latter is implemented using linkgit:git-upload-pack[1], which
> +  expects its repository to be a directory, and therefore does not
> +  work for bundles (see linkgit:git-bundle[1]).

Hmm, I do not think this is quite true.  

If "git clone /path/to/repo.bndl" implied --local, we would end up
trying to hardlink into /path/to/repo.bndl/objects and would fail.

I think what is closer to the reaility is that we check if the
source is a bundle when the local filesystem path is used and try to
clone from the bundle, before using the local filesystem path as a
directory we can "clone --local" from.  On the other hand, when the
<scheme>://<path> syntax is used, we do not even bother seeing if
the named resource is a bundle, or if --local optimization is
possible (because we do not bother seeing if the named resource is a
local filesystem entity, either).

A possibly interesting tangent to think about is what would happen
if we slightly tweak the above design.  What it would require for
the code to take "git clone https://site/repo.bndl";, realize that
the named resource is a bundle file, curl/wget it and clone from
that downloaded bundle?  And if it is feasible to implement, would
it even be a good idea to begin with?  I do not have a ready answer
to either of these questions myself.



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