Ram Rachum <r...@rachum.com> writes:
> Administrator@Turing  ~/Dropbox/Desktop/foo (development)
> $ git bisect start
> Administrator@Turing  ~/Dropbox/Desktop/foo (development|BISECTING)
> $ git bisect good 3068
> Administrator@Turing  ~/Dropbox/Desktop/foo (development|BISECTING)
> $ git bisect bad b7a8
> Bisecting: 0 revisions left to test after this (roughly 1 step)
> [0aa833916e908ea93902a6c4c227f9a884a1bcef] Merge branch 'master' into
> development
> Administrator@Turing  ~/Dropbox/Desktop/foo ((0aa8339...)|BISECTING)
> $ git bisect bad
> Bisecting: 0 revisions left to test after this (roughly 0 steps)
> [24139451ab954b1f0a9ef616775a3dba0ac81669] Creating some-file
> Administrator@Turing  ~/Dropbox/Desktop/foo ((2413945...)|BISECTING)
> $ git bisect bad
> 24139451ab954b1f0a9ef616775a3dba0ac81669 is the first bad commit
> commit 24139451ab954b1f0a9ef616775a3dba0ac81669
> Author: Ram Rachum <r...@rachum.com>
> Date:   Tue Apr 19 16:01:28 2016 +0300
>     Creating some-file
> :000000 100644 0000000000000000000000000000000000000000
> e69de29bb2d1d6434b8b29ae775ad8c2e48c5391 A  some-file
> Administrator@Turing  ~/Dropbox/Desktop/foo ((2413945...)|BISECTING)
> $

OK, I've had to learn some things first.  One is that git-bisect doesn't
find the commit along the path between a good commit and a bad commit
that introduces a bug.  You specify a bad commit and git-bisect finds an
"original bad" ancestor:  a commit that is an ancestor of the specified
bad commit that is bad and has no parent that is bad.

In this case, your command "git bisect good 3068" does *not* restrict
git-bisect's attention to the commits in 3068..b7a8.  It just tells
git-bisect that 3068 is good.  git-bisect still has to check the
ancestors of 2413, which are ancestors of b7a8 but not ancestors of

With this definition, it's clear that git-bisect should identify cf02 as
the "original bad" commit, because it's the only one.  If it doesn't,
that's a bug in Git.  And I'm not so surprised that it doesn't handle
that special case correctly, it's not an obvious one.  You should report
that as a problem on the main Git mailing list.

Now to solve your problem:  What you need to do is redefine "bad" to
mean "should have sugar but does not".  That is, "is a descendant of
3068 and does not have sugar".  When you do that, 2413 becomes good,
because it's not a descendant of 3068.  And I'll bet that if you say
"git bisect good" for 2413 you will get the result you expect.


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