In particular, if we check out something that isn't an old branch, it
now requires a new branch-name to check the thing out into.
So, for example:
git checkout -b my-branch v2.6.12
will create the new branch "my-branch", and start it at v2.6.12, while
git checkout master
will just switch back to the master branch.
Of course, if you want to create a new branch "my-branch" and _not_
check it out, you could have done so with just
git-rev-parse v2.6.12^0 > .git/refs/heads/my-branch
which I think I will codify as "git branch".
We still need to create a new branch if it didn't refer to an existing
branch, otherwise our HEAD will continue to point to something totally
different than what we just checked out.
I'll need to think about it. Maybe only do it with "-f" and force it to
the "master" branch?
It sets up the normal git environment variables and a few helper
functions (currently just "die()"), and returns ok if it all looks like
a git archive. So use it something like
. git-sh-setup-script || die "Not a git archive"
to make the rest of the git scripts more careful and readable.
It is careful by default and refuses to overwrite old info, but if you
want to force everything to be re-read, use the "-f" flag.
Some day I'll make it take individual filenames too. Right now
it's all-or-nothing.
