Re: [PATCH v2 2/3] multi-pack-index: use --object-dir real path

> From: Derrick Stolee <derrickstolee@github.com>
>
> The --object-dir argument to 'git multi-pack-index' allows a user to
> specify an alternate to use instead of the local $GITDIR. This is used
> by third-party tools like VFS for Git to maintain the pack-files in a
> "shared object cache" used by multiple clones.
>
> On Windows, the user can specify a path using a Windows-style file path
> with backslashes such as "C:\Path\To\ObjectDir". This same path style is
> used in the .git/objects/info/alternates file, so it already matches the
> path of that alternate. However, find_odb() converts these paths to
> real-paths for the comparison, which use forward slashes. As of the
> previous change, lookup_multi_pack_index() uses real-paths, so it
> correctly finds the target multi-pack-index when given these paths.
>
> Some commands such as 'git multi-pack-index repack' call child processes
> using the object_dir value, so it can be helpful to convert the path to
> the real-path before sending it to those locations.
>
> Add a callback to convert the real path immediately upon parsing the
> argument. We need to be careful that we don't store the exact value out
> of get_object_directory() and free it, or we could corrupt a later use
> of the_repository->objects->odb->path.
>
> We don't use get_object_directory() for the initial instantiation in
> cmd_multi_pack_index() because we need 'git multi-pack-index -h' to work
> without a Git repository.
>
> Signed-off-by: Derrick Stolee <derrickstolee@github.com>
> ---
>  builtin/multi-pack-index.c | 45 ++++++++++++++++++++++++++++----------
>  1 file changed, 34 insertions(+), 11 deletions(-)