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diff: ignore sparse paths in diffstat 

The diff_populate_filespec() method is used to describe the diff after a
merge operation is complete. In order to avoid expanding a sparse index,
the reuse_worktree_file() needs to be adapted to ignore files that are
outside of the sparse-checkout cone. The file names and OIDs used for
this check come from the merged tree in the case of the ORT strategy,
not the index, hence the ability to look into these paths without having
already expanded the index.

The work done by reuse_worktree_file() is only an optimization, and
requires the file being on disk for it to be of any value. Thus, it is
safe to exit the method early if we do not expect the file on disk.

Signed-off-by: Derrick Stolee <dstolee@microsoft.com>
Reviewed-by: Elijah Newren <newren@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Derrick Stolee 2021-09-08 11:23:56 +00:00 committed by Junio C Hamano
parent 55dfcf9591
commit ad90da7351
1 changed files with 8 additions and 0 deletions
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diff.c
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@ -26,6 +26,7 @@
#include "parse-options.h"
#include "help.h"
#include "promisor-remote.h"
#include "dir.h"
#ifdef NO_FAST_WORKING_DIRECTORY
#define FAST_WORKING_DIRECTORY 0
@ -3907,6 +3908,13 @@ static int reuse_worktree_file(struct index_state *istate,
if (!want_file && would_convert_to_git(istate, name))
return 0;
/*
* If this path does not match our sparse-checkout definition,
* then the file will not be in the working directory.
*/
if (!path_in_sparse_checkout(name, istate))
return 0;
len = strlen(name);
pos = index_name_pos(istate, name, len);
if (pos < 0)