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It is expensive to compute the sha1 of the entire commit-graph file each
time we open it. Git only does this if it is re-writing the file.
This patch will only verify the checksum when calling the external API
git_commit_graph_open(), which explicitly says it opens and verifies
the commit graph in the documentation.
For internal library calls, we call git_commit_graph_get_file(), which
mmaps the commit-graph file in read-only mode. Therefore it is safe to
skip the validation check there.
Tests were added to check that the validation works in the happy path,
and prevents us from opening the file when validation fails.
(Note from Derrick Stolee: This patch was applied internally at GitHub
after we recognized the performance impact it had during an upgrade of
libgit2. The original author left the company before we remembered to
send it upstream.)
Signed-off-by: Derrick Stolee <derrickstolee@github.com>
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The experimental function signature is only available when
`GIT_EXPERIMENTAL_SHA256` is enabled.
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`git_oid`s now have a type, and we require the oid type when creating
the object id from creation functions.
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In preparation for SHA256 support, `GIT_OID_RAWSZ` and `GIT_OID_HEXSZ`
need to indicate that they're the size of _SHA1_ OIDs.
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Like we want to separate libgit2 and utility source code, we want to
separate libgit2 and utility tests. Start by moving all the tests into
libgit2.
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