From d4c0a3ac78cf2fc16c144bf720d1451fcd1e267d Mon Sep 17 00:00:00 2001 From: Johannes Schindelin Date: Fri, 24 May 2019 05:23:47 -0700 Subject: fill_stat_cache_info(): prepare for an fsmonitor fix We will need to pass down the `struct index_state` to `mark_fsmonitor_valid()` for an upcoming bug fix, and this here function calls that there function, so we need to extend the signature of `fill_stat_cache_info()` first. Signed-off-by: Johannes Schindelin Signed-off-by: Junio C Hamano diff --git a/apply.c b/apply.c index f15afa9..4992eca 100644 --- a/apply.c +++ b/apply.c @@ -4310,7 +4310,7 @@ static int add_index_file(struct apply_state *state, "created file '%s'"), path); } - fill_stat_cache_info(ce, &st); + fill_stat_cache_info(state->repo->index, ce, &st); } if (write_object_file(buf, size, blob_type, &ce->oid) < 0) { discard_cache_entry(ce); diff --git a/builtin/update-index.c b/builtin/update-index.c index 27db092..3f8cc6c 100644 --- a/builtin/update-index.c +++ b/builtin/update-index.c @@ -280,7 +280,7 @@ static int add_one_path(const struct cache_entry *old, const char *path, int len memcpy(ce->name, path, len); ce->ce_flags = create_ce_flags(0); ce->ce_namelen = len; - fill_stat_cache_info(ce, st); + fill_stat_cache_info(&the_index, ce, st); ce->ce_mode = ce_mode_from_stat(old, st->st_mode); if (index_path(&the_index, &ce->oid, path, st, diff --git a/cache.h b/cache.h index b4bb2e2..bf20337 100644 --- a/cache.h +++ b/cache.h @@ -826,7 +826,7 @@ int match_stat_data(const struct stat_data *sd, struct stat *st); int match_stat_data_racy(const struct index_state *istate, const struct stat_data *sd, struct stat *st); -void fill_stat_cache_info(struct cache_entry *ce, struct stat *st); +void fill_stat_cache_info(struct index_state *istate, struct cache_entry *ce, struct stat *st); #define REFRESH_REALLY 0x0001 /* ignore_valid */ #define REFRESH_UNMERGED 0x0002 /* allow unmerged */ diff --git a/entry.c b/entry.c index 0e4f2f2..53380bb 100644 --- a/entry.c +++ b/entry.c @@ -373,7 +373,7 @@ finish: if (lstat(ce->name, &st) < 0) return error_errno("unable to stat just-written file %s", ce->name); - fill_stat_cache_info(ce, &st); + fill_stat_cache_info(state->istate, ce, &st); ce->ce_flags |= CE_UPDATE_IN_BASE; mark_fsmonitor_invalid(state->istate, ce); state->istate->cache_changed |= CE_ENTRY_CHANGED; diff --git a/read-cache.c b/read-cache.c index 22e7b99..d3b43ae 100644 --- a/read-cache.c +++ b/read-cache.c @@ -195,7 +195,7 @@ int match_stat_data(const struct stat_data *sd, struct stat *st) * cache, ie the parts that aren't tracked by GIT, and only used * to validate the cache. */ -void fill_stat_cache_info(struct cache_entry *ce, struct stat *st) +void fill_stat_cache_info(struct index_state *istate, struct cache_entry *ce, struct stat *st) { fill_stat_data(&ce->ce_stat_data, st); @@ -728,7 +728,7 @@ int add_to_index(struct index_state *istate, const char *path, struct stat *st, memcpy(ce->name, path, namelen); ce->ce_namelen = namelen; if (!intent_only) - fill_stat_cache_info(ce, st); + fill_stat_cache_info(istate, ce, st); else ce->ce_flags |= CE_INTENT_TO_ADD; @@ -1447,7 +1447,7 @@ static struct cache_entry *refresh_cache_ent(struct index_state *istate, updated = make_empty_cache_entry(istate, ce_namelen(ce)); copy_cache_entry(updated, ce); memcpy(updated->name, ce->name, ce->ce_namelen + 1); - fill_stat_cache_info(updated, &st); + fill_stat_cache_info(istate, updated, &st); /* * If ignore_valid is not set, we should leave CE_VALID bit * alone. Otherwise, paths marked with --no-assume-unchanged -- cgit v0.10.2-6-g49f6 From b5a81697520621a0a1093f590d60d8e578348843 Mon Sep 17 00:00:00 2001 From: Johannes Schindelin Date: Fri, 24 May 2019 05:23:48 -0700 Subject: mark_fsmonitor_valid(): mark the index as changed if needed Without this bug fix, t7519's four "status doesn't detect unreported modifications" test cases would fail occasionally (and, oddly enough, *a lot* more frequently on Windows). The reason is that these test cases intentionally use the side effect of `git status` to re-write the index if any updates were detected: they first clean the worktree, run `git status` to update the index as well as show the output to the casual reader, then make the worktree dirty again and expect no changes to reported if running with a mocked fsmonitor hook. The problem with this strategy was that the index was written during said `git status` on the clean worktree for the *wrong* reason: not because the index was marked as changed (it wasn't), but because the recorded mtimes were racy with the index' own mtime. As the mtime granularity on Windows is 100 nanoseconds (see e.g. https://docs.microsoft.com/en-us/windows/desktop/SysInfo/file-times), the mtimes of the files are often enough *not* racy with the index', so that that `git status` call currently does not always update the index (including the fsmonitor extension), causing the test case to fail. The obvious fix: if we change *any* index entry's `CE_FSMONITOR_VALID` flag, we should also mark the index as changed. That will cause the index to be written upon `git status`, *including* an updated fsmonitor extension. Side note: Even though the reader might think that the t7519 issue should be *much* more prevalent on Linux, given that the ext4 filesystem (that seems to be used by every Linux distribution) stores mtimes in nanosecond precision. However, ext4 uses `current_kernel_time()` (see https://unix.stackexchange.com/questions/11599#comment762968_11599; it is *amazingly* hard to find any proper source of information about such ext4 questions) whose accuracy seems to depend on many factors but is safely worse than the 100-nanosecond granularity of NTFS (again, it is *horribly* hard to find anything remotely authoritative about this question). So it seems that the racy index condition that hid the bug fixed by this patch simply is a lot more likely on Linux than on Windows. But not impossible ;-) Signed-off-by: Johannes Schindelin Signed-off-by: Junio C Hamano diff --git a/diff-lib.c b/diff-lib.c index a838c21..61812f4 100644 --- a/diff-lib.c +++ b/diff-lib.c @@ -232,7 +232,7 @@ int run_diff_files(struct rev_info *revs, unsigned int option) if (!changed && !dirty_submodule) { ce_mark_uptodate(ce); - mark_fsmonitor_valid(ce); + mark_fsmonitor_valid(istate, ce); if (!revs->diffopt.flags.find_copies_harder) continue; } diff --git a/fsmonitor.h b/fsmonitor.h index 8489fa3..739318a 100644 --- a/fsmonitor.h +++ b/fsmonitor.h @@ -49,9 +49,10 @@ void refresh_fsmonitor(struct index_state *istate); * called any time the cache entry has been updated to reflect the * current state of the file on disk. */ -static inline void mark_fsmonitor_valid(struct cache_entry *ce) +static inline void mark_fsmonitor_valid(struct index_state *istate, struct cache_entry *ce) { - if (core_fsmonitor) { + if (core_fsmonitor && !(ce->ce_flags & CE_FSMONITOR_VALID)) { + istate->cache_changed = 1; ce->ce_flags |= CE_FSMONITOR_VALID; trace_printf_key(&trace_fsmonitor, "mark_fsmonitor_clean '%s'", ce->name); } diff --git a/preload-index.c b/preload-index.c index e73600e..ed6eaa4 100644 --- a/preload-index.c +++ b/preload-index.c @@ -78,7 +78,7 @@ static void *preload_thread(void *_data) if (ie_match_stat(index, ce, &st, CE_MATCH_RACY_IS_DIRTY|CE_MATCH_IGNORE_FSMONITOR)) continue; ce_mark_uptodate(ce); - mark_fsmonitor_valid(ce); + mark_fsmonitor_valid(index, ce); } while (--nr > 0); if (p->progress) { struct progress_data *pd = p->progress; diff --git a/read-cache.c b/read-cache.c index d3b43ae..3281676 100644 --- a/read-cache.c +++ b/read-cache.c @@ -204,7 +204,7 @@ void fill_stat_cache_info(struct index_state *istate, struct cache_entry *ce, st if (S_ISREG(st->st_mode)) { ce_mark_uptodate(ce); - mark_fsmonitor_valid(ce); + mark_fsmonitor_valid(istate, ce); } } @@ -1432,7 +1432,7 @@ static struct cache_entry *refresh_cache_ent(struct index_state *istate, */ if (!S_ISGITLINK(ce->ce_mode)) { ce_mark_uptodate(ce); - mark_fsmonitor_valid(ce); + mark_fsmonitor_valid(istate, ce); } return ce; } -- cgit v0.10.2-6-g49f6