[PATCH] dir.c: ignore paths containing .git when invalidating untracked cache
From: Nguyễn Thái Ngọc Duy <hidden>
Date: 2018-02-04 09:38:39
Subsystem:
the rest · Maintainer:
Linus Torvalds
read_directory() code ignores all paths named ".git" even if it's not a valid git repository. See treat_path() for details. Since ".git" is basically invisible to read_directory(), when we are asked to invalidate a path that contains ".git", we can safely ignore it because the slow path would not consider it anyway. This helps when fsmonitor is used and we have a real ".git" repo at worktree top. Occasionally .git/index will be updated and if the fsmonitor hook does not filter it, untracked cache is asked to invalidate the path ".git/index". Without this patch, we invalidate the root directory unncessarily, which: - makes read_directory() fall back to slow path for root directory (slower) - makes the index dirty (because UNTR extension is updated). Depending on the index size, writing it down could also be slow. Noticed-by: Ævar Arnfjörð Bjarmason [off-list ref] Signed-off-by: Nguyễn Thái Ngọc Duy <redacted> --- Sorry for the resend, I forgot git@vger. dir.c | 13 ++++++++++++- git-compat-util.h | 2 ++ wrapper.c | 12 ++++++++++++ 3 files changed, 26 insertions(+), 1 deletion(-)
diff --git a/dir.c b/dir.c
index 7c4b45e30e..f8b4cabba9 100644
--- a/dir.c
+++ b/dir.c@@ -1773,7 +1773,7 @@ static enum path_treatment treat_path(struct dir_struct *dir, if (!de) return treat_path_fast(dir, untracked, cdir, istate, path, baselen, pathspec); - if (is_dot_or_dotdot(de->d_name) || !strcmp(de->d_name, ".git")) + if (is_dot_or_dotdot(de->d_name) || !fspathcmp(de->d_name, ".git")) return path_none; strbuf_setlen(path, baselen); strbuf_addstr(path, de->d_name);
@@ -2970,8 +2970,19 @@ static int invalidate_one_component(struct untracked_cache *uc, void untracked_cache_invalidate_path(struct index_state *istate, const char *path) { + const char *end; + int skipped; + if (!istate->untracked || !istate->untracked->root) return; + if (!fspathcmp(path, ".git")) + return; + if (ignore_case) + skipped = skip_caseprefix(path, "/.git", &end); + else + skipped = skip_prefix(path, "/.git", &end); + if (skipped && (*end == '\0' || *end == '/')) + return; invalidate_one_component(istate->untracked, istate->untracked->root, path, strlen(path)); }
diff --git a/git-compat-util.h b/git-compat-util.h
index 68b2ad531e..27e0b761a3 100644
--- a/git-compat-util.h
+++ b/git-compat-util.h@@ -484,6 +484,8 @@ static inline int skip_prefix(const char *str, const char *prefix, return 0; } +int skip_caseprefix(const char *str, const char *prefix, const char **out); + /* * If the string "str" is the same as the string in "prefix", then the "arg" * parameter is set to the "def" parameter and 1 is returned.
diff --git a/wrapper.c b/wrapper.c
index d20356a776..bb888d9401 100644
--- a/wrapper.c
+++ b/wrapper.c@@ -690,3 +690,15 @@ int xgethostname(char *buf, size_t len) buf[len - 1] = 0; return ret; } + +int skip_caseprefix(const char *str, const char *prefix, const char **out) +{ + do { + if (!*prefix) { + *out = str; + return 1; + } + } while (tolower(*str++) == tolower(*prefix++)); + + return 0; +}
--
2.16.1.207.gedba492059