view tests/test-backwards-remove @ 616:d45d1c90032e

Fix zombie files in merge
# HG changeset patch
# User [e-mail]
# Node ID 57667c9b93a5a743e4629d15a0e6bd76699130c3
# Parent  d2994b5298fb20f87dc1d4747635b280db3c0526

Fix zombie files in merge

Keir Fraser observed the following:

> I made a small test case that illustrates the bug in merging changesets 
> with 'hg remove's in them:
> 
> 1. Create a repository A containing files foo & bar.
> 2. Create clone called B.
> 3. A removes file bar, and commits this removal.
> 4. B edits file foo, and commits this edit.
> 
> Now, if B:
>   # hg pull ../A; hg update -m; hg commit
> Then bar remains deleted.
> 
> If A:
>   # hg pull ../B; hg update -m; hg commit
> Then bar is resurrected!
> 
> It looks as though, when you merge across a branch, any deletions in 
> your own branch are forgotten.
> ...
> Fixing this is a must, as zombie files are a real pain. :-)

Keir later patched our local copy of hg as shown below, which fixes
the problem.  I've also enclosed a test which captures the test Keir
outlined...

Files deleted on a branch should not automatically reappear in a merge

Patch notes:
 1. The first chunk does not change behaviour, but cleans up the code
    to more closely match check of 'force' in the second chunk. I
    think it makes the code clearer.
 2. The second chunk fixes two bugs --
    i.  If we choose to keep a remotely-changed locally-deleted file,
        then we need to 'get' that file. If we choose to delete it
        then no action need be taken (it is already deleted in the
        working manifest). Without this fix, choosing to delete would
        get a Python traceback.
    ii. The test for whether the file was remotely-created is
        insufficient. It is only true if f is not in the common
        ancestor. Otherwise the file was deleted locally, and should
        remain deleted. (this is the most important fix!)


Index: hg/tests/test-merge6
===================================================================

#!/bin/sh -x
hg init
echo This is file a1 > a
hg add a
hg commit -t "commit #0" -d "0 0" -u user
ls
echo This is file b1 > b
hg add b
hg commit -t "commit #1" -d "0 0" -u user
hg co 0
# B should disappear
ls