From 0ec9949f78e348250f55ba0343344ec8c606be11 Mon Sep 17 00:00:00 2001 From: Nipunn Koorapati Date: Wed, 17 Mar 2021 21:22:22 +0000 Subject: [PATCH] fsmonitor: add assertion that fsmonitor is valid to check_removed Validate that fsmonitor is valid to futureproof against bugs where check_removed might be called from places that haven't refreshed. Signed-off-by: Nipunn Koorapati Signed-off-by: Junio C Hamano --- diff-lib.c | 18 +++++++++++------- fsmonitor.h | 11 +++++++++++ 2 files changed, 22 insertions(+), 7 deletions(-) diff --git a/diff-lib.c b/diff-lib.c index 3fb538ad18..e5a58c9259 100644 --- a/diff-lib.c +++ b/diff-lib.c @@ -28,8 +28,9 @@ * exists for ce that is a submodule -- it is a submodule that is not * checked out). Return negative for an error. */ -static int check_removed(const struct cache_entry *ce, struct stat *st) +static int check_removed(const struct index_state *istate, const struct cache_entry *ce, struct stat *st) { + assert(is_fsmonitor_refreshed(istate)); if (!(ce->ce_flags & CE_FSMONITOR_VALID) && lstat(ce->name, st) < 0) { if (!is_missing_file_error(errno)) return -1; @@ -136,7 +137,7 @@ int run_diff_files(struct rev_info *revs, unsigned int option) memset(&(dpath->parent[0]), 0, sizeof(struct combine_diff_parent)*5); - changed = check_removed(ce, &st); + changed = check_removed(istate, ce, &st); if (!changed) wt_mode = ce_mode_from_stat(ce, st.st_mode); else { @@ -216,7 +217,7 @@ int run_diff_files(struct rev_info *revs, unsigned int option) } else { struct stat st; - changed = check_removed(ce, &st); + changed = check_removed(istate, ce, &st); if (changed) { if (changed < 0) { perror(ce->name); @@ -278,7 +279,8 @@ static void diff_index_show_file(struct rev_info *revs, oid, oid_valid, ce->name, dirty_submodule); } -static int get_stat_data(const struct cache_entry *ce, +static int get_stat_data(const struct index_state *istate, + const struct cache_entry *ce, const struct object_id **oidp, unsigned int *modep, int cached, int match_missing, @@ -290,7 +292,7 @@ static int get_stat_data(const struct cache_entry *ce, if (!cached && !ce_uptodate(ce)) { int changed; struct stat st; - changed = check_removed(ce, &st); + changed = check_removed(istate, ce, &st); if (changed < 0) return -1; else if (changed) { @@ -321,12 +323,13 @@ static void show_new_file(struct rev_info *revs, const struct object_id *oid; unsigned int mode; unsigned dirty_submodule = 0; + struct index_state *istate = revs->diffopt.repo->index; /* * New file in the index: it might actually be different in * the working tree. */ - if (get_stat_data(new_file, &oid, &mode, cached, match_missing, + if (get_stat_data(istate, new_file, &oid, &mode, cached, match_missing, &dirty_submodule, &revs->diffopt) < 0) return; @@ -342,8 +345,9 @@ static int show_modified(struct rev_info *revs, unsigned int mode, oldmode; const struct object_id *oid; unsigned dirty_submodule = 0; + struct index_state *istate = revs->diffopt.repo->index; - if (get_stat_data(new_entry, &oid, &mode, cached, match_missing, + if (get_stat_data(istate, new_entry, &oid, &mode, cached, match_missing, &dirty_submodule, &revs->diffopt) < 0) { if (report_missing) diff_index_show_file(revs, "-", old_entry, diff --git a/fsmonitor.h b/fsmonitor.h index 7f1794b90b..f20d72631d 100644 --- a/fsmonitor.h +++ b/fsmonitor.h @@ -49,6 +49,17 @@ void refresh_fsmonitor(struct index_state *istate); */ int fsmonitor_is_trivial_response(const struct strbuf *query_result); +/* + * Check if refresh_fsmonitor has been called at least once. + * refresh_fsmonitor is idempotent. Returns true if fsmonitor is + * not enabled (since the state will be "fresh" w/ CE_FSMONITOR_VALID unset) + * This version is useful for assertions + */ +static inline int is_fsmonitor_refreshed(const struct index_state *istate) +{ + return !core_fsmonitor || istate->fsmonitor_has_run_once; +} + /* * Set the given cache entries CE_FSMONITOR_VALID bit. This should be * called any time the cache entry has been updated to reflect the