Michael Haggerty 506a760db8 refs: change how packed refs are deleted
Add a function remove_ref(), which removes a single entry from a
reference cache.

Use this function to reimplement repack_without_ref().  The old
version iterated over all refs, packing all of them except for the one
to be deleted, then discarded the entire packed reference cache.  The
new version deletes the doomed reference from the cache *before*
iterating.

This has two advantages:

* the code for writing packed-refs becomes simpler, because it doesn't
  have to exclude one of the references.

* it is no longer necessary to discard the packed refs cache after
  deleting a reference: symbolic refs cannot be packed, so packed
  references cannot depend on each other, so the rest of the packed
  refs cache remains valid after a reference is deleted.

Signed-off-by: Michael Haggerty <mhagger@alum.mit.edu>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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////////////////////////////////////////////////////////////////

	GIT - the stupid content tracker

////////////////////////////////////////////////////////////////

"git" can mean anything, depending on your mood.

 - random three-letter combination that is pronounceable, and not
   actually used by any common UNIX command.  The fact that it is a
   mispronunciation of "get" may or may not be relevant.
 - stupid. contemptible and despicable. simple. Take your pick from the
   dictionary of slang.
 - "global information tracker": you're in a good mood, and it actually
   works for you. Angels sing, and a light suddenly fills the room.
 - "goddamn idiotic truckload of sh*t": when it breaks

Git is a fast, scalable, distributed revision control system with an
unusually rich command set that provides both high-level operations
and full access to internals.

Git is an Open Source project covered by the GNU General Public
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Torvalds with help of a group of hackers around the net.

Please read the file INSTALL for installation instructions.

See Documentation/gittutorial.txt to get started, then see
Documentation/everyday.txt for a useful minimum set of commands, and
Documentation/git-commandname.txt for documentation of each command.
If git has been correctly installed, then the tutorial can also be
read with "man gittutorial" or "git help tutorial", and the
documentation of each command with "man git-commandname" or "git help
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CVS users may also want to read Documentation/gitcvs-migration.txt
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Many Git online resources are accessible from http://git-scm.com/
including full documentation and Git related tools.

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The maintainer frequently sends the "What's cooking" reports that
list the current status of various development topics to the mailing
list.  The discussion following them give a good reference for
project status, development direction and remaining tasks.
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