[PATCH] subtree : fix split output containing unrelated history

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From: tjones629 <tjones629@xxxxxxxxx>

When a subtree is deleted and re-added at the same location with the
--squash arguement the history created by "git subtree split" will
contain commits that do not affect the files in the given prefix
resulting in an incorrect history for the subtree.

This commit fixes the issue by removing lines that create cache files for
commits that did not contain the given prefix after new parent commits have
been created. The history created by "git subtree split" with this change
no longer contains unrelated commits or commits that occured before the
subtree was removed and re-added.

Signed-off-by: Taylor Jones <tjones629@xxxxxxxxx>
---
    Bugfix for subtree split function
    
    This patch fixes a bug in the subtree split command. The bug can be
    reproduced by adding a squashed subtree to a repository then removing it
    and squash adding it again with the same prefix. This will result in the
    subtree split history containing every commit from the main repository
    instead of just the commits that affect the subtree.

Published-As: https://github.com/gitgitgadget/git/releases/tag/pr-867%2Ftjones629%2Fbugfix-subtree_removal-v1
Fetch-It-Via: git fetch https://github.com/gitgitgadget/git pr-867/tjones629/bugfix-subtree_removal-v1
Pull-Request: https://github.com/gitgitgadget/git/pull/867

 contrib/subtree/git-subtree.sh | 4 ----
 1 file changed, 4 deletions(-)

diff --git a/contrib/subtree/git-subtree.sh b/contrib/subtree/git-subtree.sh
index 868e18b9a1ab..f1b8a3b2e74c 100755
--- a/contrib/subtree/git-subtree.sh
+++ b/contrib/subtree/git-subtree.sh
@@ -667,10 +667,6 @@ process_split_commit () {
 	if test -z "$tree"
 	then
 		set_notree "$rev"
-		if test -n "$newparents"
-		then
-			cache_set "$rev" "$rev"
-		fi
 		return
 	fi
 

base-commit: 71ca53e8125e36efbda17293c50027d31681a41f
-- 
gitgitgadget



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