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44451a2e (attr: teach "--attr-source=<tree>" global option to "git", 2023-05-06) provided the ability to pass in a treeish as the attr source. In the context of serving Git repositories as bare repos like we do at GitLab however, it would be easier to point --attr-source to HEAD for all commands by setting it once. Add a new config attr.tree that allows this. Signed-off-by: John Cai <johncai86@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
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