[PATCH v2 4/8] repository: add repo reference to index_state

From: Derrick Stolee <redacted>

It will be helpful to add behavior to index operations that might
trigger an object lookup. Since each index belongs to a specific
repository, add a 'repo' pointer to struct index_state that allows
access to this repository.

This will prevent future changes from needing to pass an additional
'struct repository *repo' parameter and instead rely only on the 'struct
index_state *istate' parameter.

Signed-off-by: Derrick Stolee <redacted>
---
 cache.h      | 1 +
 repository.c | 4 ++++
 2 files changed, 5 insertions(+)

diff --git a/cache.h b/cache.h
index 71097657489..f9c7a603841 100644
--- a/cache.h
+++ b/cache.h

@@ -328,6 +328,7 @@ struct index_state {
 	struct ewah_bitmap *fsmonitor_dirty;
 	struct mem_pool *ce_mem_pool;
 	struct progress *progress;
+	struct repository *repo;
 };
 
 /* Name hashing */

diff --git a/repository.c b/repository.c
index a4174ddb062..67a4c1da2d9 100644
--- a/repository.c
+++ b/repository.c

@@ -264,6 +264,10 @@ int repo_read_index(struct repository *repo)
 	if (!repo->index)
 		repo->index = xcalloc(1, sizeof(*repo->index));
 
+	/* Complete the double-reference */
+	if (!repo->index->repo)
+		repo->index->repo = repo;
+
 	return read_index_from(repo->index, repo->index_file, repo->gitdir);
 }
 

-- 
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