Re: v2.9.3 and v2.10.0: `name-ref' HEAD gives wrong branch name

[Steffen Nurpmeso <steffen@sdaoden.eu>]

Hello.

Jakub Narębski <jnareb@gmail.com> wrote:
 |W dniu 20.09.2016 o 20:54, Bryan Turner pisze:
 |> On Tue, Sep 20, 2016 at 9:23 AM, Steffen Nurpmeso <steffen@sdaoden.eu> \
 |> wrote:
 |>> Hello again,
 |>>
 |>> yah, sorry, i'm back again..
 |>> I try to find a way to find the name of the current branch in an
 |>> automated way, because i need to ensure that a commit happens on
 |>> it and no other branch.  Now the problem arises that the commit
 |>> ref at the time of that commit maybe shared in between several
 |>> different branches, but no more thereafter, of course:
 |>>
 |>>   ?0[steffen@wales ]$ git branch|grep '^*'
 |>>   * stable/v14.9
 |
 |Not good, 'git branch' is a porcelain (user facing) command, so it
 |output may change; e.g. '*' could be replaced with '•'. For example
 |output for detached HEAD had changed!

Ok.  I went the road Bryan suggested, i had only forgotten this.
Yes, it caused mysterious bugs once rev-parse reversed the output,
but i didn't understand the order at first, anyway.  With todays'
ever-rotating distributions i don't even try to keep up; currently
unthinkable to use the same release of an OS for five years, like
FreeBSD 5.3.  Well.

  ...
 |>> Is there another way except looking into .git/HEAD or using sed(1)
 |>> on the output of `branch' to find the right name?
 |> 
 |> Have you tried "git symbolic-ref HEAD"?
  ...
 |This does not work for detached HEAD, but perhaps you don't need
 |to worry about this.

No, not for me: it will only switch in between two different
stable/ which exist.  But thanks, just give it to me!

 |  $ git rev-parse --symbolic-full-name HEAD
 |  refs/heads/master

This is a really good suggestion, which i will remember.  I didn't
know this at all yet:

  $ git rev-parse --symbolic-full-name --abbrev-ref=strict HEAD

Seems to do exactly what i want, non-fragile, then.

 ...
 |But
 ...
 |  You are in 'detached HEAD' state. [...]
 | 
 |  $ git rev-parse --symbolic-full-name HEAD
 |  HEAD
 |
 |  $ git symbolic-ref HEAD
 |  fatal: ref HEAD is not a symbolic ref
 |
 |  $ git branch
 |  * (HEAD detached at 3e2ebf9)
 |    master

And name-rev gives "HEAD master~2" in a test of mine, or only
"master~2", or "undefined" if i use --tags, for completeness sake.

Thanks, Jakub.  I'm using the plumbing.

--steffen