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author | John Keeping <john@keeping.me.uk> | 2014-07-16 20:23:49 +0100 |
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committer | Junio C Hamano <gitster@pobox.com> | 2014-07-16 13:07:40 -0700 |
commit | 1e0dacdbdb751caa5936b6d1510f5e8db4d1ed5f (patch) | |
tree | aaceab8c326f0e2b418d16a8e8c46230391db013 /t/t7003-filter-branch.sh | |
parent | rebase--am: use --cherry-pick instead of --ignore-if-in-upstream (diff) | |
download | tgif-1e0dacdbdb751caa5936b6d1510f5e8db4d1ed5f.tar.xz |
rebase: omit patch-identical commits with --fork-point
When the `--fork-point` argument was added to `git rebase`, we changed
the value of $upstream to be the fork point instead of the point from
which we want to rebase. When $orig_head..$upstream is empty this does
not change the behaviour, but when there are new changes in the upstream
we are no longer checking if any of them are patch-identical with
changes in $upstream..$orig_head.
Fix this by introducing a new variable to hold the fork point and using
this to restrict the range as an extra (negative) revision argument so
that the set of desired revisions becomes (in fork-point mode):
git rev-list --cherry-pick --right-only \
$upstream...$orig_head ^$fork_point
This allows us to correctly handle the scenario where we have the
following topology:
C --- D --- E <- dev
/
B <- master@{1}
/
o --- B' --- C* --- D* <- master
where:
- B' is a fixed-up version of B that is not patch-identical with B;
- C* and D* are patch-identical to C and D respectively and conflict
textually if applied in the wrong order;
- E depends textually on D.
The correct result of `git rebase master dev` is that B is identified as
the fork-point of dev and master, so that C, D, E are the commits that
need to be replayed onto master; but C and D are patch-identical with C*
and D* and so can be dropped, so that the end result is:
o --- B' --- C* --- D* --- E <- dev
If the fork-point is not identified, then picking B onto a branch
containing B' results in a conflict and if the patch-identical commits
are not correctly identified then picking C onto a branch containing D
(or equivalently D*) results in a conflict.
This change allows us to handle both of these cases, where previously we
either identified the fork-point (with `--fork-point`) but not the
patch-identical commits *or* (with `--no-fork-point`) identified the
patch-identical commits but not the fact that master had been rewritten.
Reported-by: Ted Felix <ted@tedfelix.com>
Signed-off-by: John Keeping <john@keeping.me.uk>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
Diffstat (limited to 't/t7003-filter-branch.sh')
0 files changed, 0 insertions, 0 deletions