Like previous integrations [1] [2], this series allows 'git read-tree' to operate using a sparse index. The first two patches are bugfixes for issues found while implementing the 'read-tree' integration: * The first (patch 1/7) fixes an edge case in which a repo with no in-cone files or directories would have its root collapsed into a sparse directory; the fix ensures the root directory is never collapsed into a sparse directory. * The second (patch 2/7) corrects the 'git status' reporting of changes nested inside the subdirectory of a sparse directory, ensuring that the modified file (not the subdirectory) is correctly reported as having changes. The remainder of the series focuses on utilizing the sparse index in 'git read-tree'. After some baseline behavior-establishing tests (patch 3/7), sparse index usage is trivially enabled (patch 4/7) for 'read-tree' except: * usage with '--prefix' * two- and three-way merge These cases require additional changes in order to work as expected (i.e., outwardly matching non-sparse index sparse-checkout). For the former, the sparse index can be enabled as long as the index is expanded when the prefix is a directory outside the sparse cone (patch 5/7). For the latter, sparse directories that cannot be trivially merged must have their contents merged file-by-file, done by recursively traversing the trees represented by the sparse directories (patches 6/7 & 7/7). Thanks! * Victoria [1] https://lore.kernel.org/git/pull.1109.v2.git.1641924306.gitgitgadget@xxxxxxxxx/ [2] https://lore.kernel.org/git/pull.1048.v6.git.1638201164.gitgitgadget@xxxxxxxxx/ Victoria Dye (7): sparse-index: prevent repo root from becoming sparse status: fix nested sparse directory diff in sparse index read-tree: expand sparse checkout test coverage read-tree: integrate with sparse index read-tree: narrow scope of index expansion for '--prefix' read-tree: make two-way merge sparse-aware read-tree: make three-way merge sparse-aware builtin/read-tree.c | 10 +- dir.c | 7 +- t/perf/p2000-sparse-operations.sh | 1 + t/t1092-sparse-checkout-compatibility.sh | 129 +++++++++++++++++++++++ unpack-trees.c | 121 ++++++++++++++++++++- wt-status.c | 9 ++ 6 files changed, 268 insertions(+), 9 deletions(-) base-commit: e6ebfd0e8cbbd10878070c8a356b5ad1b3ca464e Published-As: https://github.com/gitgitgadget/git/releases/tag/pr-1157%2Fvdye%2Fsparse%2Fread-tree-v1 Fetch-It-Via: git fetch https://github.com/gitgitgadget/git pr-1157/vdye/sparse/read-tree-v1 Pull-Request: https://github.com/gitgitgadget/git/pull/1157 -- gitgitgadget
