# \[PATCH 2/3\] split-index: accept that a base index can be empty - From: Johannes Schindelin via GitGitGadget \ - Date: 2023-06-29 13:23:20 - List: git - Page: https://ratatoskr.run/git/2023/06/7972041 - Thread: https://ratatoskr.run/git/2023/06/7972039/t.md ```text From: Johannes Schindelin We are about to fix an ancient bug where `do_read_index()` pretended that the index was not initialized when there are no index entries. Before the `index_state` structure gained the `initialized` flag in 913e0e99b6a (unpack_trees(): protect the handcrafted in-core index from read_cache(), 2008-08-23), that was the best we could do (even if it was incorrect: it is totally possible to read a Git index file that contains no index entries). This pattern was repeated also in 998330ac2e7 (read-cache: look for shared index files next to the index, too, 2021-08-26), which we fix here by _not_ mistaking an empty base index for a missing `sharedindex.*` file. Signed-off-by: Johannes Schindelin --- read-cache.c | 14 ++++++++------ 1 file changed, 8 insertions(+), 6 deletions(-) diff --git a/read-cache.c b/read-cache.c index b10caa9831c..e15a472f54f 100644 --- a/read-cache.c +++ b/read-cache.c @@ -2455,12 +2455,14 @@ int read_index_from(struct index_state *istate, const char *path, base_oid_hex = oid_to_hex(&split_index->base_oid); base_path = xstrfmt("%s/sharedindex.%s", gitdir, base_oid_hex); - trace2_region_enter_printf("index", "shared/do_read_index", - the_repository, "%s", base_path); - ret = do_read_index(split_index->base, base_path, 0); - trace2_region_leave_printf("index", "shared/do_read_index", - the_repository, "%s", base_path); - if (!ret) { + if (file_exists(base_path)) { + trace2_region_enter_printf("index", "shared/do_read_index", + the_repository, "%s", base_path); + + ret = do_read_index(split_index->base, base_path, 0); + trace2_region_leave_printf("index", "shared/do_read_index", + the_repository, "%s", base_path); + } else { char *path_copy = xstrdup(path); char *base_path2 = xstrfmt("%s/sharedindex.%s", dirname(path_copy), base_oid_hex); -- gitgitgadget ```