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docs: document zero bits in index "mode"

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Documentation/gitformat-index.txt describes the "mode" as 32 bits, but
only documents 16 bits. Document the missing 16 bits and specify that
'unused' bits must be zero.

Signed-off-by: Glen Choo <chooglen@google.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Glen Choo 2023-02-01 10:40:41 +08:00 committed by Junio C Hamano
parent 844ede312b
commit 3a2ebaebc7
1 changed files with 3 additions and 1 deletions
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Documentation/gitformat-index.txt
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@ -83,11 +83,13 @@ Git index format
32-bit mode, split into (high to low bits)
16-bit unused, must be zero
4-bit object type
valid values in binary are 1000 (regular file), 1010 (symbolic link)
and 1110 (gitlink)
3-bit unused
3-bit unused, must be zero
9-bit unix permission. Only 0755 and 0644 are valid for regular files.
Symbolic links and gitlinks have value 0 in this field.