Re: VCS comparison table

On Thu, Oct 19, 2006 at 10:01:33AM -0700, Carl Worth wrote:

On Thu, 19 Oct 2006 10:58:48 -0400, Aaron Bentley wrote:

quoted

On the other hand, I think your revision identifiers are not as
permanent as you think.

In the first place, it seems fairly common in the Git community to
rebase.  This process throws away old revisions and creates new
revisions that are morally equivalent[1].

Yes, rebasing does "destroy history" in one sense, (in actual fact, it
creates new commits and leaves the old ones around, which may or may
not have references to them anymore).

Note that the id's are still permanent in this case; they will never
(module some assumptions about the crypto) be reused.  So a given id
points at one and only one object, for all time; it's just that we may
forget what that one object is....

quoted

In the second place, one must consider the "nuclear launch codes"
scenario.

Sure. And git does provide tools that can do this.

So in this case you can certainly lose the launch codes.  But you have
forever granted everyone a way to determine whether a given guess at the
launch codes is correct.  (Again, assuming some stuff about SHA1).

--b.