Re: Bug: git branch -D can be used to delete branch which is currently checked out

> On 11 Mar 2016, at 5:23 AM, Junio C Hamano <gitster@pobox.com> wrote:
> 
> Junio C Hamano <gitster@pobox.com> writes:
> 
>> It is a possibility to teach the files backend of refs API that some
>> filesystems are case insensitive and do something special about them,
>> but I think in the longer term a more productive solution would be
>> to use the upcoming "pluggable ref backend" subsystem and either
>> 
>> - use a backend that is not the "files" backend (e.g. lmdb backend,
>>   or the tree-object based backend);
>> 
>> - add a variant of "files" backend but encodes the refnames in a
>>   way that is safe on case insensitive filesystems.
> 
> A typofix s/but encodes/that encodes/ is needed to make this
> sentence make any sense.  Sorry for a typo.
> 
> Just to elaborate a bit more, here is what I mean:
> 
> - Thanks to recent work by David, Ronnie and Michael, we eradicated
>   most if not all code that assume that the result of checking
>   "test -f .git/refs/heads/foo" tells us if a branch 'foo' exists
>   [*1*].  They all go through the API designed to allow different
>   backends to access refs.
> 
> - The traditional code that implemented 'foo' branch as writing a
>   file '.git/refs/heads/foo' has been moved to a "files" backend.
>   When used on a platform with case insensitive filesystem, it can
>   answer "it exists" when asked about a branch 'Foo' (notice the
>   case difference).
> 
> - We could add a new backend that is still based largely on the
>   existing "files" backend code, but stores 'foo' branch as a file
>   ".git/refs/6865616473/666f6f" while storing another branch 'Foo'
>   as ".git/refs/6865616473/466f6f" (I just used byte values in hex
>   in this example, but of course you can use a more efficient and
>   mostly human readable representations).
> 
> That way, even on a platform with case insensitive filesystem, you
> do not have to worry about getting confused by the filesystem when
> you have 'foo' and 'Foo' branches.
> 
> 
> [Footnote]
> 
> *1* This is not strictly true even in the pre-pluggable ref backend
>    world, as your refs may appear in the packed-refs file, but this
>    detail does not matter in the larger picture.
> 
>