Re: VCS comparison table
- From
- J. Bruce Fields <bfields@fieldses.org>
- Date
- Oct 19, 2006, 17:14 UTC
- Message-ID
- <20061019171409.GA31671@fieldses.org>
- In-Reply-To
- <8764eg2qaa.wl%cworth@cworth.org>
On Thu, Oct 19, 2006 at 10:01:33AM -0700, Carl Worth wrote:
Show 11 quoted lines
> On Thu, 19 Oct 2006 10:58:48 -0400, Aaron Bentley wrote: > > 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....
> > 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.