From: Stefan Beller <sbeller@google.com>
To: Elijah Newren <newren@gmail.com>
Cc: git <git@vger.kernel.org>
Subject: Re: [PATCH 07/30] directory rename detection: partially renamed directory testcase/discussion
Date: Mon, 13 Nov 2017 16:07:06 -0800 [thread overview]
Message-ID: <CAGZ79kaR5yfpopa+oB13ZftY_Qi37OXaATjeL21gyAP6abpxAw@mail.gmail.com> (raw)
In-Reply-To: <20171110190550.27059-8-newren@gmail.com>
On Fri, Nov 10, 2017 at 11:05 AM, Elijah Newren <newren@gmail.com> wrote:
> Signed-off-by: Elijah Newren <newren@gmail.com>
> ---
> t/t6043-merge-rename-directories.sh | 100 ++++++++++++++++++++++++++++++++++++
> 1 file changed, 100 insertions(+)
>
> diff --git a/t/t6043-merge-rename-directories.sh b/t/t6043-merge-rename-directories.sh
> index 021513ec00..ec054b210a 100755
> --- a/t/t6043-merge-rename-directories.sh
> +++ b/t/t6043-merge-rename-directories.sh
> @@ -650,4 +650,104 @@ test_expect_success '3b-check: Avoid implicit rename if involved as source on cu
> # of a rename on either side of a merge.
> ###########################################################################
>
> +
> +###########################################################################
> +# SECTION 4: Partially renamed directory; still exists on both sides of merge
> +#
> +# What if we were to attempt to do directory rename detection when someone
> +# "mostly" moved a directory but still left some files around, or,
> +# equivalently, fully renamed a directory in one commmit and then recreated
> +# that directory in a later commit adding some new files and then tried to
> +# merge?
> +#
> +# It's hard to divine user intent in these cases, because you can make an
> +# argument that, depending on the intermediate history of the side being
> +# merged, that some users will want files in that directory to
> +# automatically be detected and renamed, while users with a different
> +# intermediate history wouldn't want that rename to happen.
> +#
> +# I think that it is best to simply not have directory rename detection
> +# apply to such cases. My reasoning for this is four-fold: (1) it's
> +# easiest for users in general to figure out what happened if we don't
> +# apply directory rename detection in any such case, (2) it's an easy rule
> +# to explain ["We don't do directory rename detection if the directory
> +# still exists on both sides of the merge"], (3) we can get some hairy
> +# edge/corner cases that would be really confusing and possibly not even
> +# representable in the index if we were to even try, and [related to 3] (4)
> +# attempting to resolve this issue of divining user intent by examining
> +# intermediate history goes against the spirit of three-way merges and is a
> +# path towards crazy corner cases that are far more complex than what we're
> +# already dealing with.
This last paragraph ("I think") sounds like part of a commit message,
rather than
a note inside a testing script. Not sure if I recommend moving this
text into the
commit message.
> +# This section contains a test for this partially-renamed-directory case.
> +###########################################################################
> +
> +# Testcase 4a, Directory split, with original directory still present
> +# (Related to testcase 1f)
> +# Commit A: z/{b,c,d,e}
> +# Commit B: y/{b,c,d}, z/e
> +# Commit C: z/{b,c,d,e,f}
> +# Expected: y/{b,c,d}, z/{e,f}
> +# NOTE: Even though most files from z moved to y, we don't want f to follow.
Makes sense.
> +###########################################################################
> +# Rules suggested by section 4:
> +#
> +# Directory-rename-detection should be turned off for any directories (as
> +# a source for renames) that exist on both sides of the merge. (The "as
> +# a source for renames" clarification is due to cases like 1c where
> +# the target directory exists on both sides and we do want the rename
> +# detection.) But, sadly, see testcase 8b.
Looking forward for that test case.
next prev parent reply other threads:[~2017-11-14 0:07 UTC|newest]
Thread overview: 81+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-11-10 19:05 [PATCH 00/30] Add directory rename detection to git Elijah Newren
2017-11-10 19:05 ` [PATCH 01/30] Tighten and correct a few testcases for merging and cherry-picking Elijah Newren
2017-11-13 19:32 ` Stefan Beller
2017-11-10 19:05 ` [PATCH 02/30] merge-recursive: Fix logic ordering issue Elijah Newren
2017-11-13 19:48 ` Stefan Beller
2017-11-13 22:04 ` Elijah Newren
2017-11-13 22:12 ` Stefan Beller
2017-11-13 23:39 ` Elijah Newren
2017-11-13 23:46 ` Stefan Beller
2017-11-10 19:05 ` [PATCH 03/30] merge-recursive: Add explanation for src_entry and dst_entry Elijah Newren
2017-11-13 21:06 ` Stefan Beller
2017-11-13 22:57 ` Elijah Newren
2017-11-13 23:11 ` Stefan Beller
2017-11-14 1:26 ` Junio C Hamano
2017-11-10 19:05 ` [PATCH 04/30] directory rename detection: basic testcases Elijah Newren
2017-11-13 22:04 ` Stefan Beller
2017-11-14 0:57 ` Elijah Newren
2017-11-14 1:21 ` Stefan Beller
2017-11-14 1:40 ` Elijah Newren
2017-11-14 2:03 ` Junio C Hamano
2017-11-10 19:05 ` [PATCH 05/30] directory rename detection: directory splitting testcases Elijah Newren
2017-11-13 23:20 ` Stefan Beller
2017-11-10 19:05 ` [PATCH 06/30] directory rename detection: testcases to avoid taking detection too far Elijah Newren
2017-11-13 23:25 ` Stefan Beller
2017-11-14 1:02 ` Elijah Newren
2017-11-10 19:05 ` [PATCH 07/30] directory rename detection: partially renamed directory testcase/discussion Elijah Newren
2017-11-14 0:07 ` Stefan Beller [this message]
2017-11-10 19:05 ` [PATCH 08/30] directory rename detection: files/directories in the way of some renames Elijah Newren
2017-11-14 0:15 ` Stefan Beller
2017-11-14 1:19 ` Elijah Newren
2017-11-10 19:05 ` [PATCH 09/30] directory rename detection: testcases checking which side did the rename Elijah Newren
2017-11-14 0:25 ` Stefan Beller
2017-11-14 1:30 ` Elijah Newren
2017-11-10 19:05 ` [PATCH 10/30] directory rename detection: more involved edge/corner testcases Elijah Newren
2017-11-14 0:42 ` Stefan Beller
2017-11-14 21:11 ` Elijah Newren
2017-11-14 22:47 ` Stefan Beller
2017-11-10 19:05 ` [PATCH 11/30] directory rename detection: testcases exploring possibly suboptimal merges Elijah Newren
2017-11-14 20:33 ` Stefan Beller
2017-11-14 21:42 ` Elijah Newren
2017-11-10 19:05 ` [PATCH 12/30] directory rename detection: miscellaneous testcases to complete coverage Elijah Newren
2017-11-15 20:03 ` Stefan Beller
2017-11-16 21:17 ` Elijah Newren
2017-11-10 19:05 ` [PATCH 13/30] directory rename detection: tests for handling overwriting untracked files Elijah Newren
2017-11-10 19:05 ` [PATCH 14/30] directory rename detection: tests for handling overwriting dirty files Elijah Newren
2017-11-10 19:05 ` [PATCH 15/30] merge-recursive: Move the get_renames() function Elijah Newren
2017-11-14 4:46 ` Junio C Hamano
2017-11-14 17:41 ` Elijah Newren
2017-11-15 1:20 ` Junio C Hamano
2017-11-10 19:05 ` [PATCH 16/30] merge-recursive: Introduce new functions to handle rename logic Elijah Newren
2017-11-14 4:56 ` Junio C Hamano
2017-11-14 5:14 ` Junio C Hamano
2017-11-14 18:24 ` Elijah Newren
2017-11-10 19:05 ` [PATCH 17/30] merge-recursive: Fix leaks of allocated renames and diff_filepairs Elijah Newren
2017-11-14 4:58 ` Junio C Hamano
2017-11-10 19:05 ` [PATCH 18/30] merge-recursive: Make !o->detect_rename codepath more obvious Elijah Newren
2017-11-10 19:05 ` [PATCH 19/30] merge-recursive: Split out code for determining diff_filepairs Elijah Newren
2017-11-14 5:20 ` Junio C Hamano
2017-11-10 19:05 ` [PATCH 20/30] merge-recursive: Add a new hashmap for storing directory renames Elijah Newren
2017-11-10 19:05 ` [PATCH 21/30] merge-recursive: Add get_directory_renames() Elijah Newren
2017-11-14 5:30 ` Junio C Hamano
2017-11-14 18:38 ` Elijah Newren
2017-11-10 19:05 ` [PATCH 22/30] merge-recursive: Check for directory level conflicts Elijah Newren
2017-11-10 19:05 ` [PATCH 23/30] merge-recursive: Add a new hashmap for storing file collisions Elijah Newren
2017-11-10 19:05 ` [PATCH 24/30] merge-recursive: Add computation of collisions due to dir rename & merging Elijah Newren
2018-06-10 10:56 ` René Scharfe
2018-06-10 11:03 ` René Scharfe
2018-06-10 20:44 ` Jeff King
2018-06-11 15:03 ` Elijah Newren
2018-06-14 17:36 ` Junio C Hamano
2017-11-10 19:05 ` [PATCH 25/30] merge-recursive: Check for file level conflicts then get new name Elijah Newren
2017-11-10 19:05 ` [PATCH 26/30] merge-recursive: When comparing files, don't include trees Elijah Newren
2017-11-10 19:05 ` [PATCH 27/30] merge-recursive: Apply necessary modifications for directory renames Elijah Newren
2017-11-15 20:23 ` Stefan Beller
2017-11-16 3:54 ` Elijah Newren
2017-11-10 19:05 ` [PATCH 28/30] merge-recursive: Avoid clobbering untracked files with " Elijah Newren
2017-11-10 19:05 ` [RFC PATCH 29/30] merge-recursive: Fix overwriting dirty files involved in renames Elijah Newren
2017-11-10 19:05 ` [PATCH 30/30] merge-recursive: Fix remaining directory rename + dirty overwrite cases Elijah Newren
2017-11-10 22:27 ` [PATCH 00/30] Add directory rename detection to git Philip Oakley
2017-11-10 23:26 ` Elijah Newren
2017-11-13 15:04 ` Philip Oakley
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