Re: [PATCH] branch: move multiple branches in a single --force

[Junio C Hamano <gitster@pobox.com>]

"Andrea Stacchiotti via GitGitGadget" <gitgitgadget@gmail.com>
writes:

> From: Andrea Stacchiotti <andreastacchiotti@gmail.com>
>
> Using either the 1-arg or 2-args form of --force
> it is possible to only move one branch at a time,
> to HEAD and <arg2> respectively.

If you are renaming (or "moving") a branch that is not checked out
anywhere to a new name that is not in use, you do not even need to
force.  You can just do:

    git branch -m old new

You are not moving branches without "-m".

What you are doing is to point a branch A to point at a commit X
with

    git branch A X

Your proposed log message talks about "--force" too much; if you are
creating a branch, you need "--force" only when the name you want to
use is already taken.  Pointing the branch tip to a commit is not
inherently tied to "--force", but your description gives a false
impression that you are adding a special feature when "--force" is
used.  The proposed log message needs rewritten.

If there is not yet a branch A, you do not even need "--force" on
this command line.  Also take a special note that "X" does not have
to be a branch name.  It only has to resolve to a commit, so this is
also valid:

    git branch [--force] A X~4

I can understand that it may appear to be handy to be able to set
multiple branches at the same time with

    git branch A X~4 B X~3 C X~2		(* does not exist *)

with or without "--force".  If none of A, B, or C exist, they can be
created from these three comits X~4, X~3, and X~2.

Or you could propose a different syntax to create branches pointing
at the same commit

    git branch A B C origin/master		(* does not exist *)

But either syntax to create multiple branches feel somewhat
inadequate.  What should happen to their associated configuration
data like branch.A.remote and branch.B.merge?  Should they all point
at the same remote & a branch at the remote?  How would that make
having multiple of them useful?