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Re: Self-inflicted "abort" in a newbie attempt at read-only exploration of a cloned repository?

On Thu, Apr 5, 2018 at 4:18 PM, Bryan Turner <bturner@xxxxxxxxxxxxx> wrote:
> On Thu, Apr 5, 2018 at 12:42 PM, Thierry Moreau
> <thierry.moreau@xxxxxxxxxxxxx> wrote:
>> Dear GIT enthusiasts!
>> This ends up with a "git checkout" command aborting. A bit frustrating at
>> the early stage of GIT learning curve.
>> My first goal is to clone repositories locally in order to explore the
>> various linux kernel versions, with the rich GIT metadata.
>> Thus, I clone:
>> $  git clone --branch linux-4.16.y
>> https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable.git
>> linux-stable
>> $  git -C linux-stable/ branch
>> * linux-4.16.y
>> So far so good. Then, I want to extract an earlier kernel version into a tmp
>> dir:
>> $  mkdir tmp
>> $  git -C linux-stable/ --work-tree $PWD/tmp/ checkout linux-4.15.y
>> $  git -C linux-stable/ branch
>> * linux-4.15.y
>>   linux-4.16.y
> The documentation for --work-tree says:
> --work-tree=<path>
> Set the path to the working tree. It can be an absolute path or a path
> relative to the current working directory. This can also be controlled
> by setting the GIT_WORK_TREE environment variable and the
> core.worktree configuration variable (see core.worktree in
> git-config(1) for a more detailed discussion).
> So passing --work-tree tells Git where to store your _files_, but it's
> still using the same .git directory.
> If your goal is to have worktrees for various versions, that implies
> the git worktree [1] command might be more along the lines of what
> you're looking for. An invocation based on above might look like this:
> $ git -C linux-stable/ worktree add $PWD/tmp/ checkout linux-4.15.y

Apologies, I didn't mean to have the "checkout" in that.
$ git -C linux-stable/ worktree add $PWD/tmp/ linux-4.15.y

> That should leave linux-4.16.y checked out in linux-stable, while
> creating a full work tree in $PWD/tmp that has 4.15.y checked out.
> Note that worktree is a newer git command. 2.17 has it, but old
> versions like 2.1 won't.
> [1] https://git-scm.com/docs/git-worktree
> Hope this helps!
> Bryan