Re: VCS comparison table

Jelmer Vernooij [off-list ref] wrote:

On Mon, 2006-10-23 at 11:45 -0700, Linus Torvalds wrote:

quoted

On Mon, 23 Oct 2006, Jakub Narebski wrote:

quoted

The place for timestamp and commiter info is in the revision metadata
(in commit object in git). Not in revision id. Unless you think that
"accidentally the same" doesn't happen...

Well, git and bzr really do share the same "stable" revision naming, 
although in git it's more indirect, and thus "covers" more.

[snip]

quoted

So you could more easily _fake_ a commit name in bzr, and depending on how 
things are done it might be more open to malicious attacks for that reason 
(or unintentionally - if two people apply the exact same patch from an 
email, and take the author/date info from the email like hit does, you 
might have clashes. But with a 64-bit random number, that's probably 
unlikely, unless you also hit some other bad luck like having the 
pseudo-random sequence seeded by "time()", and people just _happen_ to 
apply the email at the exact same second).

Bzr stores a checksum of the commit separately from the revision id in
the metadata of a revision. The revision is not used by itself to check
the integrity of a revision.

I think Linus' original point here was that if you communicate the
revision id to another person and they fetch that revision there
is no assurance that the commit they have received is the exact
same commit you had.

In Git that assurance is implicitly present as the unique
identification you communicated to the other person is also that
integrity verification.  Therefore its nearly impossible to spoof.

-- 
Shawn.