From 9eb00af5627f1a04ca083128085ca6774fce0524 Mon Sep 17 00:00:00 2001 From: Derrick Stolee Date: Wed, 14 Jul 2021 13:12:35 +0000 Subject: [PATCH] diff-lib: handle index diffs with sparse dirs While comparing an index to a tree, we may see a sparse directory entry. In this case, we should compare that portion of the tree to the tree represented by that entry. This could include a new tree which needs to be expanded to a full list of added files. It could also include an existing tree, in which case all of the changes inside are important to describe, including the modifications, additions, and deletions. Note that the case where the tree has a path and the index does not remains identical to before: the lack of a cache entry is the same with a sparse index. Use diff_tree_oid() appropriately to compute the diff. Reviewed-by: Elijah Newren Signed-off-by: Derrick Stolee Signed-off-by: Junio C Hamano --- diff-lib.c | 19 +++++++++++++++++++ 1 file changed, 19 insertions(+) diff --git a/diff-lib.c b/diff-lib.c index c2ac9250fe9..f9eadc4fc1a 100644 --- a/diff-lib.c +++ b/diff-lib.c @@ -325,6 +325,11 @@ static void show_new_file(struct rev_info *revs, unsigned dirty_submodule = 0; struct index_state *istate = revs->diffopt.repo->index; + if (new_file && S_ISSPARSEDIR(new_file->ce_mode)) { + diff_tree_oid(NULL, &new_file->oid, new_file->name, &revs->diffopt); + return; + } + /* * New file in the index: it might actually be different in * the working tree. @@ -347,6 +352,20 @@ static int show_modified(struct rev_info *revs, unsigned dirty_submodule = 0; struct index_state *istate = revs->diffopt.repo->index; + assert(S_ISSPARSEDIR(old_entry->ce_mode) == + S_ISSPARSEDIR(new_entry->ce_mode)); + + /* + * If both are sparse directory entries, then expand the + * modifications to the file level. If only one was a sparse + * directory, then they appear as an add and delete instead of + * a modification. + */ + if (S_ISSPARSEDIR(new_entry->ce_mode)) { + diff_tree_oid(&old_entry->oid, &new_entry->oid, new_entry->name, &revs->diffopt); + return 0; + } + if (get_stat_data(istate, new_entry, &oid, &mode, cached, match_missing, &dirty_submodule, &revs->diffopt) < 0) { if (report_missing)