Is it by design you can create a branch called 'HEAD'?

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One of our devs managed to push a branch called HEAD into our master
repository, which then caused various failures for people doing pulls.

   c2014aa..cbe0021  trunk      -> origin/trunk
error: Ref refs/remotes/origin/trunk is at
cbe002152fcc917216ad9003037309893f09901d but expected
c2014aa485130013ca7eda1cb4a4eef192f9406d
 ! c2014aa...2bb416b HEAD       -> origin/HEAD  (unable to update local ref)

And warnings like:

$ git log HEAD
warning: refname 'HEAD' is ambiguous.

(we renamed master to 'trunk' long ago for various reasons)

In order to clean it up we found that there was an entry

2bb416bb4a44fbd61f29479d63a95705a7044e32 refs/heads/HEAD

in our master packed-refs file, along with the normal HEAD file:

$ cat HEAD
ref: refs/heads/trunk
$ cat refs/heads/trunk
0752c05e75dd645833fb0ea7ce8e534cbd603f0b

I deleted that line and then we removed these (output of find -ls)

20119672    0 -rw-rw-r--   1 root     cvs             0 May 21 01:26
./logs/refs/remotes/origin/HEAD
20120092    4 -rw-rw-r--   1 root     cvs           162 May 21 01:26
./logs/refs/heads/HEAD

And things seemed to be fine. (yes we hillariously call our git user
group cvs :-)

So I am wondering, did we do the cleanup right?  Is this behavior by
design? What is the most appropriate way to prevent it from happening
again?

I will try to find out from the responsible dev if they have their
command history available to see what they did.

cheers,
Yves

-- 
perl -Mre=debug -e "/just|another|perl|hacker/"
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