[PATCH v2 3/6] pathspec: remove PATHSPEC_STRIP_SUBMODULE_SLASH_EXPENSIVE flag

[Brandon Williams <bmwill@google.com>]

Since (ae8d08242 pathspec: pass directory indicator to
match_pathspec_item()) the path matching logic has been able to cope
with submodules without needing to strip off a trailing slash if a path
refers to a submodule.

Since the stripping the trailing slash is no longer necessary, remove
the PATHSPEC_STRIP_SUBMODULE_SLASH_EXPENSIVE flag.  In addition, factor
out the logic which dies if a path decends into a submodule so that it
can still be used as a check after a pathspec struct has been
initialized.

Signed-off-by: Brandon Williams <bmwill@google.com>
---
 builtin/add.c          |  5 +++--
 builtin/check-ignore.c |  4 +++-
 pathspec.c             | 29 -----------------------------
 pathspec.h             | 14 +++-----------
 submodule.c            | 33 +++++++++++++++++++++++++++++++++
 submodule.h            |  2 ++
 6 files changed, 44 insertions(+), 43 deletions(-)

diff --git a/builtin/add.c b/builtin/add.c
index ec58e3679..86770d6af 100644
--- a/builtin/add.c
+++ b/builtin/add.c
@@ -388,10 +388,11 @@ int cmd_add(int argc, const char **argv, const char *prefix)
 	 */
 	parse_pathspec(&pathspec, 0,
 		       PATHSPEC_PREFER_FULL |
-		       PATHSPEC_SYMLINK_LEADING_PATH |
-		       PATHSPEC_STRIP_SUBMODULE_SLASH_EXPENSIVE,
+		       PATHSPEC_SYMLINK_LEADING_PATH,
 		       prefix, argv);
 
+	die_path_inside_submodule(&the_index, &pathspec);
+
 	if (add_new_files) {
 		int baselen;
 
diff --git a/builtin/check-ignore.c b/builtin/check-ignore.c
index 1d73d3ca3..91040a4b0 100644
--- a/builtin/check-ignore.c
+++ b/builtin/check-ignore.c
@@ -4,6 +4,7 @@
 #include "quote.h"
 #include "pathspec.h"
 #include "parse-options.h"
+#include "submodule.h"
 
 static int quiet, verbose, stdin_paths, show_non_matching, no_index;
 static const char * const check_ignore_usage[] = {
@@ -87,10 +88,11 @@ static int check_ignore(struct dir_struct *dir,
 	parse_pathspec(&pathspec,
 		       PATHSPEC_ALL_MAGIC & ~PATHSPEC_FROMTOP,
 		       PATHSPEC_SYMLINK_LEADING_PATH |
-		       PATHSPEC_STRIP_SUBMODULE_SLASH_EXPENSIVE |
 		       PATHSPEC_KEEP_ORDER,
 		       prefix, argv);
 
+	die_path_inside_submodule(&the_index, &pathspec);
+
 	/*
 	 * look for pathspecs matching entries in the index, since these
 	 * should not be ignored, in order to be consistent with
diff --git a/pathspec.c b/pathspec.c
index 9b7634c5a..e42431278 100644
--- a/pathspec.c
+++ b/pathspec.c
@@ -398,32 +398,6 @@ static void strip_submodule_slash_cheap(struct pathspec_item *item)
 	}
 }
 
-static void strip_submodule_slash_expensive(struct pathspec_item *item)
-{
-	int i;
-
-	for (i = 0; i < active_nr; i++) {
-		struct cache_entry *ce = active_cache[i];
-		int ce_len = ce_namelen(ce);
-
-		if (!S_ISGITLINK(ce->ce_mode))
-			continue;
-
-		if (item->len <= ce_len || item->match[ce_len] != '/' ||
-		    memcmp(ce->name, item->match, ce_len))
-			continue;
-
-		if (item->len == ce_len + 1) {
-			/* strip trailing slash */
-			item->len--;
-			item->match[item->len] = '\0';
-		} else {
-			die(_("Pathspec '%s' is in submodule '%.*s'"),
-			    item->original, ce_len, ce->name);
-		}
-	}
-}
-
 /*
  * Perform the initialization of a pathspec_item based on a pathspec element.
  */
@@ -499,9 +473,6 @@ static void init_pathspec_item(struct pathspec_item *item, unsigned flags,
 	if (flags & PATHSPEC_STRIP_SUBMODULE_SLASH_CHEAP)
 		strip_submodule_slash_cheap(item);
 
-	if (flags & PATHSPEC_STRIP_SUBMODULE_SLASH_EXPENSIVE)
-		strip_submodule_slash_expensive(item);
-
 	if (magic & PATHSPEC_LITERAL) {
 		item->nowildcard_len = item->len;
 	} else {
diff --git a/pathspec.h b/pathspec.h
index 55e976972..3729efa85 100644
--- a/pathspec.h
+++ b/pathspec.h
@@ -62,23 +62,15 @@ struct pathspec {
 #define PATHSPEC_STRIP_SUBMODULE_SLASH_CHEAP (1<<3)
 /* die if a symlink is part of the given path's directory */
 #define PATHSPEC_SYMLINK_LEADING_PATH (1<<4)
-/*
- * This is like a combination of ..LEADING_PATH and .._SLASH_CHEAP
- * (but not the same): it strips the trailing slash if the given path
- * is a gitlink but also checks and dies if gitlink is part of the
- * leading path (i.e. the given path goes beyond a submodule). It's
- * safer than _SLASH_CHEAP and also more expensive.
- */
-#define PATHSPEC_STRIP_SUBMODULE_SLASH_EXPENSIVE (1<<5)
-#define PATHSPEC_PREFIX_ORIGIN (1<<6)
-#define PATHSPEC_KEEP_ORDER (1<<7)
+#define PATHSPEC_PREFIX_ORIGIN (1<<5)
+#define PATHSPEC_KEEP_ORDER (1<<6)
 /*
  * For the callers that just need pure paths from somewhere else, not
  * from command line. Global --*-pathspecs options are ignored. No
  * magic is parsed in each pathspec either. If PATHSPEC_LITERAL is
  * allowed, then it will automatically set for every pathspec.
  */
-#define PATHSPEC_LITERAL_PATH (1<<8)
+#define PATHSPEC_LITERAL_PATH (1<<7)
 
 extern void parse_pathspec(struct pathspec *pathspec,
 			   unsigned magic_mask,
diff --git a/submodule.c b/submodule.c
index 885663c42..80851d044 100644
--- a/submodule.c
+++ b/submodule.c
@@ -312,6 +312,39 @@ void die_in_unpopulated_submodule(const struct index_state *istate,
 	}
 }
 
+/*
+ * Dies if any paths in the provided pathspec descends into a submodule
+ */
+void die_path_inside_submodule(const struct index_state *istate,
+			       const struct pathspec *ps)
+{
+	int i, j;
+
+	for (i = 0; i < istate->cache_nr; i++) {
+		struct cache_entry *ce = istate->cache[i];
+		int ce_len = ce_namelen(ce);
+
+		if (!S_ISGITLINK(ce->ce_mode))
+			continue;
+
+		for (j = 0; j < ps->nr ; j++) {
+			const struct pathspec_item *item = &ps->items[j];
+
+			if (item->len <= ce_len)
+				continue;
+			if (item->match[ce_len] != '/')
+				continue;
+			if (strncmp(ce->name, item->match, ce_len))
+				continue;
+			if (item->len == ce_len + 1)
+				continue;
+
+			die(_("Pathspec '%s' is in submodule '%.*s'"),
+			    item->original, ce_len, ce->name);
+		}
+	}
+}
+
 int parse_submodule_update_strategy(const char *value,
 		struct submodule_update_strategy *dst)
 {
diff --git a/submodule.h b/submodule.h
index d11b4da40..266d81f1c 100644
--- a/submodule.h
+++ b/submodule.h
@@ -51,6 +51,8 @@ extern int is_submodule_initialized(const char *path);
 extern int is_submodule_populated_gently(const char *path, int *return_error_code);
 extern void die_in_unpopulated_submodule(const struct index_state *istate,
 					 const char *prefix);
+extern void die_path_inside_submodule(const struct index_state *istate,
+				      const struct pathspec *ps);
 extern int parse_submodule_update_strategy(const char *value,
 		struct submodule_update_strategy *dst);
 extern const char *submodule_strategy_to_string(const struct submodule_update_strategy *s);
-- 
2.13.0.rc2.291.g57267f2277-goog