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core.fsync: new option to harden the index

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This commit introduces the new ability for the user to harden
the index. In the event of a system crash, the index must be
durable for the user to actually find a file that has been added
to the repo and then deleted from the working tree.

We use the presence of the COMMIT_LOCK flag and absence of the
alternate_index_output as a proxy for determining whether we're
updating the persistent index of the repo or some temporary
index. We don't sync these temporary indexes.

Signed-off-by: Neeraj Singh <neerajsi@microsoft.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Neeraj Singh
2022-03-10 22:43:23 +00:00
committed by Junio C Hamano
parent 844a8ad4f8
commit ba95e96d4c
3 changed files with 15 additions and 6 deletions
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cache.h
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@ -1004,6 +1004,7 @@ enum fsync_component {
FSYNC_COMPONENT_PACK = 1 << 1,
FSYNC_COMPONENT_PACK_METADATA = 1 << 2,
FSYNC_COMPONENT_COMMIT_GRAPH = 1 << 3,
FSYNC_COMPONENT_INDEX = 1 << 4,
};
#define FSYNC_COMPONENTS_DEFAULT (FSYNC_COMPONENT_PACK | \