Re: Need to change old commit (and regenerate tree)

Hi Jon

I guess the parent of both B~3 as well as C~6 is A2. So if, as you
say, the time can be made
identical, they should yield the same SHA1 IMHO.

On Fri, May 21, 2010 at 12:05 AM, Jon Seymour [off-list ref] wrote:

On Fri, May 21, 2010 at 8:09 AM, Andreas Schwab [off-list ref] wrote:

quoted

Antriksh Pany [off-list ref] writes:

quoted

Instead of (what I initially expected):

A--------o--------o--------o--------o(old B)--------o--------o--------o(old C)

A2--------o--------o--------o--------B--------o--------o--------C


So what I am missing here? Aren't the new commits B~1, B~2, B~3
identical to C~4, C~5, C~6 (respectively) in all ways so as to have
gotten them the same SHA1 and hence appear as what I expected them to
appear?

No, they have a different commit time, which is also part of the hash.

Of course, even if the commit time was forged to be the same, the
parent of B~3 is different to the parent of C~6 and since the parent
is also contributes bits to the respective hashes, B~3 will
necessarily (unlikely hash collisions excepted!) have a different hash
to C~6

jon.