unpack-trees: use explicit repository in trace2 calls

trace2 calls in unpack-trees.c use the global 'the_repository', even though the relevant context provides an explicit repository pointer via 'istate->repo' or the local 'repo' variable.

Using the global repository can result in incorrect trace2 output when multiple repository instances are in use, as events may be attributed to the wrong repository.

Use explicit repository pointers instead in these call sites to ensure correct repository attribution.

v2:

* Use repository from src_index instead of the_repository
* Address review feedback from Patrick Steinhardt
* Avoid introducing new API or struct fields

Jayesh Daga (2):
unpack-trees: use repository from index instead of global
unpack-trees: use repository from index instead of global

 unpack-trees.c | 14 +++++++-------
 1 file changed, 7 insertions(+), 7 deletions(-)

base-commit: 5361983c075154725be47b65cca9a2421789e410
Published-As: https://github.com/gitgitgadget/git/releases/tag/pr-git-2258%2Fjayesh0104%2Funpack-trees-trace2-repo-v2
Fetch-It-Via: git fetch https://github.com/gitgitgadget/git pr-git-2258/jayesh0104/unpack-trees-trace2-repo-v2
Pull-Request: https://github.com/git/git/pull/2258

Range-diff vs v1:

1: 717da16044 ! 1: f03ea194e3 unpack-trees: use explicit repository in trace2 calls
@@ Metadata
Author: Jayesh Daga <[email protected]>

## Commit message ##
- unpack-trees: use explicit repository in trace2 calls
+ unpack-trees: use repository from index instead of global

- trace2 calls in unpack-trees.c use the global 'the_repository',
- even though the relevant context provides an explicit repository
- pointer via 'istate->repo' or the local 'repo' variable.
+ unpack_trees() currently initializes its repository from the
+ global 'the_repository', even though a repository instance is
+ already available via the source index.

- Using the global repository can result in incorrect trace2 output
- when multiple repository instances are in use, as events may be
- attributed to the wrong repository.
+ Use 'o->src_index->repo' instead of the global variable,
+ reducing reliance on global repository state.

- Use explicit repository pointers instead to ensure correct
- repository attribution.
+ This is a step towards eliminating global repository usage in
+ unpack_trees().

+ Suggested-by: Patrick Steinhardt <[email protected]>

## unpack-trees.c ##
-: ---------- > 2: fbdf3271b7 unpack-trees: use repository from index instead of global

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