Hi Elijah,
On Wed, 12 Aug 2020, Elijah Newren via GitGitGadget wrote:
> From: Elijah Newren <newren@xxxxxxxxx>
>
> sequencer's get_message() exists to provide good labels on conflict
> hunks; see commits
> d68565402a ("revert: clarify label on conflict hunks", 2010-03-20)
> bf975d379d ("cherry-pick, revert: add a label for ancestor", 2010-03-20)
> 043a4492b3 ("sequencer: factor code out of revert builtin", 2012-01-11).
> for background on this function. These labels are of the form
> <commitID>... <commit summary>
> or
> parent of <commitID>... <commit summary>
> These labels are then passed as branch names to the merge machinery.
> However, these labels, as formatted, often also serve to confuse. For
> example, if we have a rename involved in a content merge, then it
> results in text such as the following:
>
> <<<<<<<< HEAD:foo.c
> int j;
> ========
> int counter;
> >>>>>>>> b01dface... Removed unnecessary stuff:bar.c
>
> Or in various conflict messages, it can make it very difficult to read:
>
> CONFLICT (rename/delete): foo.c deleted in b01dface... Removed
> unnecessary stuff and renamed in HEAD. Version HEAD of foo.c left
> in tree.
>
> CONFLICT (file location): dir1/foo.c added in b01dface... Removed
> unnecessary stuff inside a directory that was renamed in HEAD,
> suggesting it should perhaps be moved to dir2/foo.c.
>
> Make a minor change to remove the ellipses and add parentheses around
> the commit summary; this makes all three examples much easier to read:
>
> <<<<<<<< HEAD:foo.c
> int j;
> ========
> int counter;
> >>>>>>>> b01dface (Removed unnecessary stuff):bar.c
>
> CONFLICT (rename/delete): foo.c deleted in b01dface (Removed
> unnecessary stuff) and renamed in HEAD. Version HEAD of foo.c left
> in tree.
>
> CONFLICT (file location): dir1/foo.c added in b01dface (Removed
> unnecessary stuff) inside a directory that was renamed in HEAD,
> suggesting it should perhaps be moved to dir2/foo.c.
>
> Signed-off-by: Elijah Newren <newren@xxxxxxxxx>
> Reviewed-by: Taylor Blau <me@xxxxxxxxxxxx>
> Acked-by: Junio C Hamano <gitster@xxxxxxxxx>
> ---
> sequencer: avoid garbled merge machinery messages due to commit labels
>
> Changes since v1:
>
> * Added Taylor's Reviewed-by, and Junio's Acked-by (I assume that's a
> fair translation of "Looks good", anyway; feel free to adjust when
> you apply otherwise).
Here's my ACK, if you want it ;-)
Ciao,
Dscho
>
> Published-As: https://github.com/gitgitgadget/git/releases/tag/pr-git-828%2Fnewren%2Fsequencer-merge-messages-v2
> Fetch-It-Via: git fetch https://github.com/gitgitgadget/git pr-git-828/newren/sequencer-merge-messages-v2
> Pull-Request: https://github.com/git/git/pull/828
>
> Range-diff vs v1:
>
> 1: da49e2eb58 ! 1: 762eb962cc sequencer: avoid garbled merge machinery messages due to commit labels
> @@ Commit message
> suggesting it should perhaps be moved to dir2/foo.c.
>
> Signed-off-by: Elijah Newren <newren@xxxxxxxxx>
> + Reviewed-by: Taylor Blau <me@xxxxxxxxxxxx>
> + Acked-by: Junio C Hamano <gitster@xxxxxxxxx>
>
> ## sequencer.c ##
> @@ sequencer.c: static int get_message(struct commit *commit, struct commit_message *out)
>
>
> sequencer.c | 2 +-
> t/t3404-rebase-interactive.sh | 2 +-
> t/t3507-cherry-pick-conflict.sh | 20 ++++++++++----------
> 3 files changed, 12 insertions(+), 12 deletions(-)
>
> diff --git a/sequencer.c b/sequencer.c
> index fd7701c88a..e988c12ad2 100644
> --- a/sequencer.c
> +++ b/sequencer.c
> @@ -355,7 +355,7 @@ static int get_message(struct commit *commit, struct commit_message *out)
> subject_len = find_commit_subject(out->message, &subject);
>
> out->subject = xmemdupz(subject, subject_len);
> - out->label = xstrfmt("%s... %s", abbrev, out->subject);
> + out->label = xstrfmt("%s (%s)", abbrev, out->subject);
> out->parent_label = xstrfmt("parent of %s", out->label);
>
> return 0;
> diff --git a/t/t3404-rebase-interactive.sh b/t/t3404-rebase-interactive.sh
> index 4a7d21f898..1d0a656ebd 100755
> --- a/t/t3404-rebase-interactive.sh
> +++ b/t/t3404-rebase-interactive.sh
> @@ -256,7 +256,7 @@ test_expect_success 'stop on conflicting pick' '
> D
> =======
> G
> - >>>>>>> $commit... G
> + >>>>>>> $commit (G)
> EOF
> git tag new-branch1 &&
> test_must_fail git rebase -i master &&
> diff --git a/t/t3507-cherry-pick-conflict.sh b/t/t3507-cherry-pick-conflict.sh
> index 752bc43487..152ea11dc9 100755
> --- a/t/t3507-cherry-pick-conflict.sh
> +++ b/t/t3507-cherry-pick-conflict.sh
> @@ -283,12 +283,12 @@ test_expect_success 'failed cherry-pick describes conflict in work tree' '
> a
> =======
> c
> - >>>>>>> objid picked
> + >>>>>>> objid (picked)
> EOF
>
> test_must_fail git cherry-pick picked &&
>
> - sed "s/[a-f0-9]*\.\.\./objid/" foo >actual &&
> + sed "s/[a-f0-9]* (/objid (/" foo >actual &&
> test_cmp expected actual
> '
>
> @@ -298,16 +298,16 @@ test_expect_success 'diff3 -m style' '
> cat <<-EOF >expected &&
> <<<<<<< HEAD
> a
> - ||||||| parent of objid picked
> + ||||||| parent of objid (picked)
> b
> =======
> c
> - >>>>>>> objid picked
> + >>>>>>> objid (picked)
> EOF
>
> test_must_fail git cherry-pick picked &&
>
> - sed "s/[a-f0-9]*\.\.\./objid/" foo >actual &&
> + sed "s/[a-f0-9]* (/objid (/" foo >actual &&
> test_cmp expected actual
> '
>
> @@ -319,7 +319,7 @@ test_expect_success 'revert also handles conflicts sanely' '
> a
> =======
> b
> - >>>>>>> parent of objid picked
> + >>>>>>> parent of objid (picked)
> EOF
> {
> git checkout picked -- foo &&
> @@ -345,7 +345,7 @@ test_expect_success 'revert also handles conflicts sanely' '
> test_must_fail git update-index --refresh -q &&
> test_must_fail git diff-index --exit-code HEAD &&
> test_cmp expected-stages actual-stages &&
> - sed "s/[a-f0-9]*\.\.\./objid/" foo >actual &&
> + sed "s/[a-f0-9]* (/objid (/" foo >actual &&
> test_cmp expected actual
> '
>
> @@ -429,16 +429,16 @@ test_expect_success 'revert conflict, diff3 -m style' '
> cat <<-EOF >expected &&
> <<<<<<< HEAD
> a
> - ||||||| objid picked
> + ||||||| objid (picked)
> c
> =======
> b
> - >>>>>>> parent of objid picked
> + >>>>>>> parent of objid (picked)
> EOF
>
> test_must_fail git revert picked &&
>
> - sed "s/[a-f0-9]*\.\.\./objid/" foo >actual &&
> + sed "s/[a-f0-9]* (/objid (/" foo >actual &&
> test_cmp expected actual
> '
>
>
> base-commit: dc04167d378fb29d30e1647ff6ff51dd182bc9a3
> --
> gitgitgadget
>
