Subject: [PATCH 0/1] bugfix git subtree split

From: Roland Conybeare <[email-masked]>
Date: Sun, 24 May 2026 17:23:38 -0400

I have a project that combines multiple independent repos
into an unmbrella repo, relying on git subtree.
Encountered a unrecoverable fatal error
from 'git subtree split' with error

    fatal: cache for <hash> already exists!

Problem arises because history to be split contains merge commits
that cause DAG traversal to consider the same umbrella commit on
multiple paths. The fatal triggers when 'git subtree split' tries
to cache the same commit twice; enclosed patch prunes these duplicate
paths.

Roland Conybeare (1):
  subtree: fix cache_set failure on commit reachable by multiple paths

 contrib/subtree/git-subtree.sh | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

base-commit: 6a4418c36d6bad69a599044b3cf49dcbd049cb45
--
2.50.1