use file_exists() to check if a file exists in the worktree

index 8d70623..ff97825 100644
@@ -26,6 +26,7 @@
 #include "userdiff.h"
 #include "line-range.h"
 #include "line-log.h"
+#include "dir.h"
 
 static char blame_usage[] = N_("git blame [<options>] [<rev-opts>] [<rev>] [--] file");
 

@@ -2151,16 +2152,6 @@ static void sanity_check_refcnt(struct scoreboard *sb)
 	}
 }
 
-/*
- * Used for the command line parsing; check if the path exists
- * in the working tree.
- */
-static int has_string_in_work_tree(const char *path)
-{
-	struct stat st;
-	return !lstat(path, &st);
-}
-
 static unsigned parse_score(const char *arg)
 {
 	char *end;

@@ -2656,14 +2647,14 @@ parse_done:
 		if (argc < 2)
 			usage_with_options(blame_opt_usage, options);
 		path = add_prefix(prefix, argv[argc - 1]);
-		if (argc == 3 && !has_string_in_work_tree(path)) { /* (2b) */
+		if (argc == 3 && !file_exists(path)) { /* (2b) */
 			path = add_prefix(prefix, argv[1]);
 			argv[1] = argv[2];
 		}
 		argv[argc - 1] = "--";
 
 		setup_work_tree();
-		if (!has_string_in_work_tree(path))
+		if (!file_exists(path))
 			die_errno("cannot stat path '%s'", path);
 	}
 

index 3304bff..80b972f 100644
@@ -84,7 +84,6 @@ static int check_submodules_use_gitfiles(void)
 		const char *name = list.entry[i].name;
 		int pos;
 		const struct cache_entry *ce;
-		struct stat st;
 
 		pos = cache_name_pos(name, strlen(name));
 		if (pos < 0) {

@@ -95,7 +94,7 @@ static int check_submodules_use_gitfiles(void)
 		ce = active_cache[pos];
 
 		if (!S_ISGITLINK(ce->ce_mode) ||
-		    (lstat(ce->name, &st) < 0) ||
+		    !file_exists(ce->name) ||
 		    is_empty_dir(name))
 			continue;
 

index 1c9c30d..44d85be 100644
@@ -611,7 +611,6 @@ static char *unique_path(struct merge_options *o, const char *path, const char *
 {
 	struct strbuf newpath = STRBUF_INIT;
 	int suffix = 0;
-	struct stat st;
 	size_t base_len;
 
 	strbuf_addf(&newpath, "%s~", path);

@@ -620,7 +619,7 @@ static char *unique_path(struct merge_options *o, const char *path, const char *
 	base_len = newpath.len;
 	while (string_list_has_string(&o->current_file_set, newpath.buf) ||
 	       string_list_has_string(&o->current_directory_set, newpath.buf) ||
-	       lstat(newpath.buf, &st) == 0) {
+	       file_exists(newpath.buf)) {
 		strbuf_setlen(&newpath, base_len);
 		strbuf_addf(&newpath, "_%d", suffix++);
 	}

index 6d10f05..6de8c87 100644
@@ -6,6 +6,7 @@
 #include "tree-walk.h"
 #include "refs.h"
 #include "remote.h"
+#include "dir.h"
 
 static int get_sha1_oneline(const char *, unsigned char *, struct commit_list *);
 

@@ -1237,14 +1238,13 @@ static void diagnose_invalid_sha1_path(const char *prefix,
 				       const char *object_name,
 				       int object_name_len)
 {
-	struct stat st;
 	unsigned char sha1[20];
 	unsigned mode;
 
 	if (!prefix)
 		prefix = "";
 
-	if (!lstat(filename, &st))
+	if (file_exists(filename))
 		die("Path '%s' exists on disk, but not in '%.*s'.",
 		    filename, object_name_len, object_name);
 	if (errno == ENOENT || errno == ENOTDIR) {

@@ -1271,7 +1271,6 @@ static void diagnose_invalid_index_path(int stage,
 					const char *prefix,
 					const char *filename)
 {
-	struct stat st;
 	const struct cache_entry *ce;
 	int pos;
 	unsigned namelen = strlen(filename);

@@ -1314,7 +1313,7 @@ static void diagnose_invalid_index_path(int stage,
 			    ce_stage(ce), filename);
 	}
 
-	if (!lstat(filename, &st))
+	if (file_exists(filename))
 		die("Path '%s' exists on disk, but not in the index.", filename);
 	if (errno == ENOENT || errno == ENOTDIR)
 		die("Path '%s' does not exist (neither on disk nor in the index).",

index d491e6a..b8747f5 100644
@@ -891,7 +891,6 @@ int submodule_uses_gitfile(const char *path)
 
 int ok_to_remove_submodule(const char *path)
 {
-	struct stat st;
 	ssize_t len;
 	struct child_process cp = CHILD_PROCESS_INIT;
 	const char *argv[] = {

@@ -904,7 +903,7 @@ int ok_to_remove_submodule(const char *path)
 	struct strbuf buf = STRBUF_INIT;
 	int ok_to_remove = 1;
 
-	if ((lstat(path, &st) < 0) || is_empty_dir(path))
+	if (!file_exists(path) || is_empty_dir(path))
 		return 1;
 
 	if (!submodule_uses_gitfile(path))