1 files changed, 497 insertions, 215 deletions

diff --git a/dir.c b/dir.c
index 08281d2ef7..e883a91483 100644
--- a/dir.c
+++ b/dir.c
@@ -2,12 +2,15 @@
  * This handles recursive filename detection with exclude
  * files, index knowledge etc..
  *
+ * See Documentation/technical/api-directory-listing.txt
+ *
  * Copyright (C) Linus Torvalds, 2005-2006
  *		 Junio Hamano, 2005-2006
  */
 #include "cache.h"
 #include "dir.h"
 #include "refs.h"
+#include "wildmatch.h"
 
 struct path_simplify {
 	int len;
@@ -34,56 +37,79 @@ int fnmatch_icase(const char *pattern, const char *string, int flags)
 	return fnmatch(pattern, string, flags | (ignore_case ? FNM_CASEFOLD : 0));
 }
 
-static int common_prefix(const char **pathspec)
+inline int git_fnmatch(const char *pattern, const char *string,
+		       int flags, int prefix)
 {
-	const char *path, *slash, *next;
-	int prefix;
+	int fnm_flags = 0;
+	if (flags & GFNM_PATHNAME)
+		fnm_flags |= FNM_PATHNAME;
+	if (prefix > 0) {
+		if (strncmp(pattern, string, prefix))
+			return FNM_NOMATCH;
+		pattern += prefix;
+		string += prefix;
+	}
+	if (flags & GFNM_ONESTAR) {
+		int pattern_len = strlen(++pattern);
+		int string_len = strlen(string);
+		return string_len < pattern_len ||
+		       strcmp(pattern,
+			      string + string_len - pattern_len);
+	}
+	return fnmatch(pattern, string, fnm_flags);
+}
+
+static size_t common_prefix_len(const char **pathspec)
+{
+	const char *n, *first;
+	size_t max = 0;
+	int literal = limit_pathspec_to_literal();
 
 	if (!pathspec)
-		return 0;
+		return max;
+
+	first = *pathspec;
+	while ((n = *pathspec++)) {
+		size_t i, len = 0;
+		for (i = 0; first == n || i < max; i++) {
+			char c = n[i];
+			if (!c || c != first[i] || (!literal && is_glob_special(c)))
+				break;
+			if (c == '/')
+				len = i + 1;
+		}
+		if (first == n || len < max) {
+			max = len;
+			if (!max)
+				break;
+		}
+	}
+	return max;
+}
 
-	path = *pathspec;
-	slash = strrchr(path, '/');
-	if (!slash)
-		return 0;
+/*
+ * Returns a copy of the longest leading path common among all
+ * pathspecs.
+ */
+char *common_prefix(const char **pathspec)
+{
+	unsigned long len = common_prefix_len(pathspec);
 
-	/*
-	 * The first 'prefix' characters of 'path' are common leading
-	 * path components among the pathspecs we have seen so far,
-	 * including the trailing slash.
-	 */
-	prefix = slash - path + 1;
-	while ((next = *++pathspec) != NULL) {
-		int len, last_matching_slash = -1;
-		for (len = 0; len < prefix && next[len] == path[len]; len++)
-			if (next[len] == '/')
-				last_matching_slash = len;
-		if (len == prefix)
-			continue;
-		if (last_matching_slash < 0)
-			return 0;
-		prefix = last_matching_slash + 1;
-	}
-	return prefix;
+	return len ? xmemdupz(*pathspec, len) : NULL;
 }
 
 int fill_directory(struct dir_struct *dir, const char **pathspec)
 {
-	const char *path;
-	int len;
+	size_t len;
 
 	/*
 	 * Calculate common prefix for the pathspec, and
 	 * use that to optimize the directory walk
 	 */
-	len = common_prefix(pathspec);
-	path = "";
-
-	if (len)
-		path = xmemdupz(*pathspec, len);
+	len = common_prefix_len(pathspec);
 
 	/* Read the directory and prune it */
-	read_directory(dir, path, len, pathspec);
+	read_directory(dir, pathspec ? *pathspec : "", len, pathspec);
 	return len;
 }
 
@@ -117,6 +143,7 @@ int within_depth(const char *name, int namelen,
 static int match_one(const char *match, const char *name, int namelen)
 {
 	int matchlen;
+	int literal = limit_pathspec_to_literal();
 
 	/* If the match was just the prefix, we matched */
 	if (!*match)
@@ -126,7 +153,7 @@ static int match_one(const char *match, const char *name, int namelen)
 		for (;;) {
 			unsigned char c1 = tolower(*match);
 			unsigned char c2 = tolower(*name);
-			if (c1 == '\0' || is_glob_special(c1))
+			if (c1 == '\0' || (!literal && is_glob_special(c1)))
 				break;
 			if (c1 != c2)
 				return 0;
@@ -138,7 +165,7 @@ static int match_one(const char *match, const char *name, int namelen)
 		for (;;) {
 			unsigned char c1 = *match;
 			unsigned char c2 = *name;
-			if (c1 == '\0' || is_glob_special(c1))
+			if (c1 == '\0' || (!literal && is_glob_special(c1)))
 				break;
 			if (c1 != c2)
 				return 0;
@@ -148,14 +175,16 @@ static int match_one(const char *match, const char *name, int namelen)
 		}
 	}
 
-
 	/*
 	 * If we don't match the matchstring exactly,
 	 * we need to match by fnmatch
 	 */
 	matchlen = strlen(match);
-	if (strncmp_icase(match, name, matchlen))
+	if (strncmp_icase(match, name, matchlen)) {
+		if (literal)
+			return 0;
 		return !fnmatch_icase(match, name, 0) ? MATCHED_FNMATCH : 0;
+	}
 
 	if (namelen == matchlen)
 		return MATCHED_EXACTLY;
@@ -230,7 +259,10 @@ static int match_pathspec_item(const struct pathspec_item *item, int prefix,
 			return MATCHED_RECURSIVELY;
 	}
 
-	if (item->use_wildcard && !fnmatch(match, name, 0))
+	if (item->nowildcard_len < item->len &&
+	    !git_fnmatch(match, name,
+			 item->flags & PATHSPEC_ONESTAR ? GFNM_ONESTAR : 0,
+			 item->nowildcard_len - prefix))
 		return MATCHED_FNMATCH;
 
 	return 0;
@@ -288,50 +320,91 @@ int match_pathspec_depth(const struct pathspec *ps,
 	return retval;
 }
 
+/*
+ * Return the length of the "simple" part of a path match limiter.
+ */
+static int simple_length(const char *match)
+{
+	int len = -1;
+
+	for (;;) {
+		unsigned char c = *match++;
+		len++;
+		if (c == '\0' || is_glob_special(c))
+			return len;
+	}
+}
+
 static int no_wildcard(const char *string)
 {
-	return string[strcspn(string, "*?[{\\")] == '\0';
+	return string[simple_length(string)] == '\0';
+}
+
+void parse_exclude_pattern(const char **pattern,
+			   int *patternlen,
+			   int *flags,
+			   int *nowildcardlen)
+{
+	const char *p = *pattern;
+	size_t i, len;
+
+	*flags = 0;
+	if (*p == '!') {
+		*flags |= EXC_FLAG_NEGATIVE;
+		p++;
+	}
+	len = strlen(p);
+	if (len && p[len - 1] == '/') {
+		len--;
+		*flags |= EXC_FLAG_MUSTBEDIR;
+	}
+	for (i = 0; i < len; i++) {
+		if (p[i] == '/')
+			break;
+	}
+	if (i == len)
+		*flags |= EXC_FLAG_NODIR;
+	*nowildcardlen = simple_length(p);
+	/*
+	 * we should have excluded the trailing slash from 'p' too,
+	 * but that's one more allocation. Instead just make sure
+	 * nowildcardlen does not exceed real patternlen
+	 */
+	if (*nowildcardlen > len)
+		*nowildcardlen = len;
+	if (*p == '*' && no_wildcard(p + 1))
+		*flags |= EXC_FLAG_ENDSWITH;
+	*pattern = p;
+	*patternlen = len;
 }
 
 void add_exclude(const char *string, const char *base,
-		 int baselen, struct exclude_list *which)
+		 int baselen, struct exclude_list *el)
 {
 	struct exclude *x;
-	size_t len;
-	int to_exclude = 1;
-	int flags = 0;
+	int patternlen;
+	int flags;
+	int nowildcardlen;
 
-	if (*string == '!') {
-		to_exclude = 0;
-		string++;
-	}
-	len = strlen(string);
-	if (len && string[len - 1] == '/') {
+	parse_exclude_pattern(&string, &patternlen, &flags, &nowildcardlen);
+	if (flags & EXC_FLAG_MUSTBEDIR) {
 		char *s;
-		x = xmalloc(sizeof(*x) + len);
+		x = xmalloc(sizeof(*x) + patternlen + 1);
 		s = (char *)(x+1);
-		memcpy(s, string, len - 1);
-		s[len - 1] = '\0';
-		string = s;
+		memcpy(s, string, patternlen);
+		s[patternlen] = '\0';
 		x->pattern = s;
-		flags = EXC_FLAG_MUSTBEDIR;
 	} else {
 		x = xmalloc(sizeof(*x));
 		x->pattern = string;
 	}
-	x->to_exclude = to_exclude;
-	x->patternlen = strlen(string);
+	x->patternlen = patternlen;
+	x->nowildcardlen = nowildcardlen;
 	x->base = base;
 	x->baselen = baselen;
 	x->flags = flags;
-	if (!strchr(string, '/'))
-		x->flags |= EXC_FLAG_NODIR;
-	if (no_wildcard(string))
-		x->flags |= EXC_FLAG_NOWILDCARD;
-	if (*string == '*' && no_wildcard(string+1))
-		x->flags |= EXC_FLAG_ENDSWITH;
-	ALLOC_GROW(which->excludes, which->nr + 1, which->alloc);
-	which->excludes[which->nr++] = x;
+	ALLOC_GROW(el->excludes, el->nr + 1, el->alloc);
+	el->excludes[el->nr++] = x;
 }
 
 static void *read_skip_worktree_file_from_index(const char *path, size_t *size)
@@ -357,7 +430,11 @@ static void *read_skip_worktree_file_from_index(const char *path, size_t *size)
 	return data;
 }
 
-void free_excludes(struct exclude_list *el)
+/*
+ * Frees memory within el which was allocated for exclude patterns and
+ * the file buffer.  Does not free el itself.
+ */
+void clear_exclude_list(struct exclude_list *el)
 {
 	int i;
 
@@ -373,7 +450,7 @@ int add_excludes_from_file_to_list(const char *fname,
 				   const char *base,
 				   int baselen,
 				   char **buf_p,
-				   struct exclude_list *which,
+				   struct exclude_list *el,
 				   int check_index)
 {
 	struct stat st;
@@ -383,6 +460,8 @@ int add_excludes_from_file_to_list(const char *fname,
 
 	fd = open(fname, O_RDONLY);
 	if (fd < 0 || fstat(fd, &st) < 0) {
+		if (errno != ENOENT)
+			warn_on_inaccessible(fname);
 		if (0 <= fd)
 			close(fd);
 		if (!check_index ||
@@ -420,7 +499,7 @@ int add_excludes_from_file_to_list(const char *fname,
 		if (buf[i] == '\n') {
 			if (entry != buf + i && entry[0] != '#') {
 				buf[i - (i && buf[i-1] == '\r')] = 0;
-				add_exclude(entry, base, baselen, which);
+				add_exclude(entry, base, baselen, el);
 			}
 			entry = buf + i + 1;
 		}
@@ -435,6 +514,10 @@ void add_excludes_from_file(struct dir_struct *dir, const char *fname)
 		die("cannot use %s as an exclude file", fname);
 }
 
+/*
+ * Loads the per-directory exclude list for the substring of base
+ * which has a char length of baselen.
+ */
 static void prep_exclude(struct dir_struct *dir, const char *base, int baselen)
 {
 	struct exclude_list *el;
@@ -445,7 +528,7 @@ static void prep_exclude(struct dir_struct *dir, const char *base, int baselen)
 	    (baselen + strlen(dir->exclude_per_dir) >= PATH_MAX))
 		return; /* too long a path -- ignore */
 
-	/* Pop the ones that are not the prefix of the path being checked. */
+	/* Pop the directories that are not the prefix of the path being checked. */
 	el = &dir->exclude_list[EXC_DIRS];
 	while ((stk = dir->exclude_stack) != NULL) {
 		if (stk->baselen <= baselen &&
@@ -489,87 +572,260 @@ static void prep_exclude(struct dir_struct *dir, const char *base, int baselen)
 	dir->basebuf[baselen] = '\0';
 }
 
-/* Scan the list and let the last match determine the fate.
- * Return 1 for exclude, 0 for include and -1 for undecided.
+int match_basename(const char *basename, int basenamelen,
+		   const char *pattern, int prefix, int patternlen,
+		   int flags)
+{
+	if (prefix == patternlen) {
+		if (!strcmp_icase(pattern, basename))
+			return 1;
+	} else if (flags & EXC_FLAG_ENDSWITH) {
+		if (patternlen - 1 <= basenamelen &&
+		    !strcmp_icase(pattern + 1,
+				  basename + basenamelen - patternlen + 1))
+			return 1;
+	} else {
+		if (fnmatch_icase(pattern, basename, 0) == 0)
+			return 1;
+	}
+	return 0;
+}
+
+int match_pathname(const char *pathname, int pathlen,
+		   const char *base, int baselen,
+		   const char *pattern, int prefix, int patternlen,
+		   int flags)
+{
+	const char *name;
+	int namelen;
+
+	/*
+	 * match with FNM_PATHNAME; the pattern has base implicitly
+	 * in front of it.
+	 */
+	if (*pattern == '/') {
+		pattern++;
+		prefix--;
+	}
+
+	/*
+	 * baselen does not count the trailing slash. base[] may or
+	 * may not end with a trailing slash though.
+	 */
+	if (pathlen < baselen + 1 ||
+	    (baselen && pathname[baselen] != '/') ||
+	    strncmp_icase(pathname, base, baselen))
+		return 0;
+
+	namelen = baselen ? pathlen - baselen - 1 : pathlen;
+	name = pathname + pathlen - namelen;
+
+	if (prefix) {
+		/*
+		 * if the non-wildcard part is longer than the
+		 * remaining pathname, surely it cannot match.
+		 */
+		if (prefix > namelen)
+			return 0;
+
+		if (strncmp_icase(pattern, name, prefix))
+			return 0;
+		pattern += prefix;
+		name    += prefix;
+		namelen -= prefix;
+	}
+
+	return wildmatch(pattern, name,
+			 ignore_case ? FNM_CASEFOLD : 0) == 0;
+}
+
+/*
+ * Scan the given exclude list in reverse to see whether pathname
+ * should be ignored.  The first match (i.e. the last on the list), if
+ * any, determines the fate.  Returns the exclude_list element which
+ * matched, or NULL for undecided.
  */
-int excluded_from_list(const char *pathname,
-		       int pathlen, const char *basename, int *dtype,
-		       struct exclude_list *el)
+static struct exclude *last_exclude_matching_from_list(const char *pathname,
+						       int pathlen,
+						       const char *basename,
+						       int *dtype,
+						       struct exclude_list *el)
 {
 	int i;
 
-	if (el->nr) {
-		for (i = el->nr - 1; 0 <= i; i--) {
-			struct exclude *x = el->excludes[i];
-			const char *exclude = x->pattern;
-			int to_exclude = x->to_exclude;
-
-			if (x->flags & EXC_FLAG_MUSTBEDIR) {
-				if (*dtype == DT_UNKNOWN)
-					*dtype = get_dtype(NULL, pathname, pathlen);
-				if (*dtype != DT_DIR)
-					continue;
-			}
+	if (!el->nr)
+		return NULL;	/* undefined */
 
-			if (x->flags & EXC_FLAG_NODIR) {
-				/* match basename */
-				if (x->flags & EXC_FLAG_NOWILDCARD) {
-					if (!strcmp_icase(exclude, basename))
-						return to_exclude;
-				} else if (x->flags & EXC_FLAG_ENDSWITH) {
-					if (x->patternlen - 1 <= pathlen &&
-					    !strcmp_icase(exclude + 1, pathname + pathlen - x->patternlen + 1))
-						return to_exclude;
-				} else {
-					if (fnmatch_icase(exclude, basename, 0) == 0)
-						return to_exclude;
-				}
-			}
-			else {
-				/* match with FNM_PATHNAME:
-				 * exclude has base (baselen long) implicitly
-				 * in front of it.
-				 */
-				int baselen = x->baselen;
-				if (*exclude == '/')
-					exclude++;
-
-				if (pathlen < baselen ||
-				    (baselen && pathname[baselen-1] != '/') ||
-				    strncmp_icase(pathname, x->base, baselen))
-				    continue;
-
-				if (x->flags & EXC_FLAG_NOWILDCARD) {
-					if (!strcmp_icase(exclude, pathname + baselen))
-						return to_exclude;
-				} else {
-					if (fnmatch_icase(exclude, pathname+baselen,
-						    FNM_PATHNAME) == 0)
-					    return to_exclude;
-				}
-			}
+	for (i = el->nr - 1; 0 <= i; i--) {
+		struct exclude *x = el->excludes[i];
+		const char *exclude = x->pattern;
+		int prefix = x->nowildcardlen;
+
+		if (x->flags & EXC_FLAG_MUSTBEDIR) {
+			if (*dtype == DT_UNKNOWN)
+				*dtype = get_dtype(NULL, pathname, pathlen);
+			if (*dtype != DT_DIR)
+				continue;
 		}
+
+		if (x->flags & EXC_FLAG_NODIR) {
+			if (match_basename(basename,
+					   pathlen - (basename - pathname),
+					   exclude, prefix, x->patternlen,
+					   x->flags))
+				return x;
+			continue;
+		}
+
+		assert(x->baselen == 0 || x->base[x->baselen - 1] == '/');
+		if (match_pathname(pathname, pathlen,
+				   x->base, x->baselen ? x->baselen - 1 : 0,
+				   exclude, prefix, x->patternlen, x->flags))
+			return x;
 	}
+	return NULL; /* undecided */
+}
+
+/*
+ * Scan the list and let the last match determine the fate.
+ * Return 1 for exclude, 0 for include and -1 for undecided.
+ */
+int is_excluded_from_list(const char *pathname,
+			  int pathlen, const char *basename, int *dtype,
+			  struct exclude_list *el)
+{
+	struct exclude *exclude;
+	exclude = last_exclude_matching_from_list(pathname, pathlen, basename, dtype, el);
+	if (exclude)
+		return exclude->flags & EXC_FLAG_NEGATIVE ? 0 : 1;
 	return -1; /* undecided */
 }
 
-int excluded(struct dir_struct *dir, const char *pathname, int *dtype_p)
+/*
+ * Loads the exclude lists for the directory containing pathname, then
+ * scans all exclude lists to determine whether pathname is excluded.
+ * Returns the exclude_list element which matched, or NULL for
+ * undecided.
+ */
+static struct exclude *last_exclude_matching(struct dir_struct *dir,
+					     const char *pathname,
+					     int *dtype_p)
 {
 	int pathlen = strlen(pathname);
 	int st;
+	struct exclude *exclude;
 	const char *basename = strrchr(pathname, '/');
 	basename = (basename) ? basename+1 : pathname;
 
 	prep_exclude(dir, pathname, basename-pathname);
 	for (st = EXC_CMDL; st <= EXC_FILE; st++) {
-		switch (excluded_from_list(pathname, pathlen, basename,
-					   dtype_p, &dir->exclude_list[st])) {
-		case 0:
-			return 0;
-		case 1:
-			return 1;
+		exclude = last_exclude_matching_from_list(
+			pathname, pathlen, basename, dtype_p,
+			&dir->exclude_list[st]);
+		if (exclude)
+			return exclude;
+	}
+	return NULL;
+}
+
+/*
+ * Loads the exclude lists for the directory containing pathname, then
+ * scans all exclude lists to determine whether pathname is excluded.
+ * Returns 1 if true, otherwise 0.
+ */
+static int is_excluded(struct dir_struct *dir, const char *pathname, int *dtype_p)
+{
+	struct exclude *exclude =
+		last_exclude_matching(dir, pathname, dtype_p);
+	if (exclude)
+		return exclude->flags & EXC_FLAG_NEGATIVE ? 0 : 1;
+	return 0;
+}
+
+void path_exclude_check_init(struct path_exclude_check *check,
+			     struct dir_struct *dir)
+{
+	check->dir = dir;
+	check->exclude = NULL;
+	strbuf_init(&check->path, 256);
+}
+
+void path_exclude_check_clear(struct path_exclude_check *check)
+{
+	strbuf_release(&check->path);
+}
+
+/*
+ * For each subdirectory in name, starting with the top-most, checks
+ * to see if that subdirectory is excluded, and if so, returns the
+ * corresponding exclude structure.  Otherwise, checks whether name
+ * itself (which is presumably a file) is excluded.
+ *
+ * A path to a directory known to be excluded is left in check->path to
+ * optimize for repeated checks for files in the same excluded directory.
+ */
+struct exclude *last_exclude_matching_path(struct path_exclude_check *check,
+					   const char *name, int namelen,
+					   int *dtype)
+{
+	int i;
+	struct strbuf *path = &check->path;
+	struct exclude *exclude;
+
+	/*
+	 * we allow the caller to pass namelen as an optimization; it
+	 * must match the length of the name, as we eventually call
+	 * is_excluded() on the whole name string.
+	 */
+	if (namelen < 0)
+		namelen = strlen(name);
+
+	/*
+	 * If path is non-empty, and name is equal to path or a
+	 * subdirectory of path, name should be excluded, because
+	 * it's inside a directory which is already known to be
+	 * excluded and was previously left in check->path.
+	 */
+	if (path->len &&
+	    path->len <= namelen &&
+	    !memcmp(name, path->buf, path->len) &&
+	    (!name[path->len] || name[path->len] == '/'))
+		return check->exclude;
+
+	strbuf_setlen(path, 0);
+	for (i = 0; name[i]; i++) {
+		int ch = name[i];
+
+		if (ch == '/') {
+			int dt = DT_DIR;
+			exclude = last_exclude_matching(check->dir,
+							path->buf, &dt);
+			if (exclude) {
+				check->exclude = exclude;
+				return exclude;
+			}
 		}
+		strbuf_addch(path, ch);
 	}
+
+	/* An entry in the index; cannot be a directory with subentries */
+	strbuf_setlen(path, 0);
+
+	return last_exclude_matching(check->dir, name, dtype);
+}
+
+/*
+ * Is this name excluded?  This is for a caller like show_files() that
+ * do not honor directory hierarchy and iterate through paths that are
+ * possibly in an ignored directory.
+ */
+int is_path_excluded(struct path_exclude_check *check,
+		  const char *name, int namelen, int *dtype)
+{
+	struct exclude *exclude =
+		last_exclude_matching_path(check, name, namelen, dtype);
+	if (exclude)
+		return exclude->flags & EXC_FLAG_NEGATIVE ? 0 : 1;
 	return 0;
 }
 
@@ -866,14 +1122,14 @@ enum path_treatment {
 };
 
 static enum path_treatment treat_one_path(struct dir_struct *dir,
-					  char *path, int *len,
+					  struct strbuf *path,
 					  const struct path_simplify *simplify,
 					  int dtype, struct dirent *de)
 {
-	int exclude = excluded(dir, path, &dtype);
+	int exclude = is_excluded(dir, path->buf, &dtype);
 	if (exclude && (dir->flags & DIR_COLLECT_IGNORED)
-	    && exclude_matches_pathspec(path, *len, simplify))
-		dir_add_ignored(dir, path, *len);
+	    && exclude_matches_pathspec(path->buf, path->len, simplify))
+		dir_add_ignored(dir, path->buf, path->len);
 
 	/*
 	 * Excluded? If we don't explicitly want to show
@@ -883,7 +1139,7 @@ static enum path_treatment treat_one_path(struct dir_struct *dir,
 		return path_ignored;
 
 	if (dtype == DT_UNKNOWN)
-		dtype = get_dtype(de, path, *len);
+		dtype = get_dtype(de, path->buf, path->len);
 
 	/*
 	 * Do we want to see just the ignored files?
@@ -900,9 +1156,8 @@ static enum path_treatment treat_one_path(struct dir_struct *dir,
 	default:
 		return path_ignored;
 	case DT_DIR:
-		memcpy(path + *len, "/", 2);
-		(*len)++;
-		switch (treat_directory(dir, path, *len, simplify)) {
+		strbuf_addch(path, '/');
+		switch (treat_directory(dir, path->buf, path->len, simplify)) {
 		case show_directory:
 			if (exclude != !!(dir->flags
 					  & DIR_SHOW_IGNORED))
@@ -923,26 +1178,21 @@ static enum path_treatment treat_one_path(struct dir_struct *dir,
 
 static enum path_treatment treat_path(struct dir_struct *dir,
 				      struct dirent *de,
-				      char *path, int path_max,
+				      struct strbuf *path,
 				      int baselen,
-				      const struct path_simplify *simplify,
-				      int *len)
+				      const struct path_simplify *simplify)
 {
 	int dtype;
 
 	if (is_dot_or_dotdot(de->d_name) || !strcmp(de->d_name, ".git"))
 		return path_ignored;
-	*len = strlen(de->d_name);
-	/* Ignore overly long pathnames! */
-	if (*len + baselen + 8 > path_max)
-		return path_ignored;
-	memcpy(path + baselen, de->d_name, *len + 1);
-	*len += baselen;
-	if (simplify_away(path, *len, simplify))
+	strbuf_setlen(path, baselen);
+	strbuf_addstr(path, de->d_name);
+	if (simplify_away(path->buf, path->len, simplify))
 		return path_ignored;
 
 	dtype = DTYPE(de);
-	return treat_one_path(dir, path, len, simplify, dtype, de);
+	return treat_one_path(dir, path, simplify, dtype, de);
 }
 
 /*
@@ -959,36 +1209,37 @@ static int read_directory_recursive(struct dir_struct *dir,
 				    int check_only,
 				    const struct path_simplify *simplify)
 {
-	DIR *fdir = opendir(*base ? base : ".");
+	DIR *fdir;
 	int contents = 0;
+	struct dirent *de;
+	struct strbuf path = STRBUF_INIT;
 
-	if (fdir) {
-		struct dirent *de;
-		char path[PATH_MAX + 1];
-		memcpy(path, base, baselen);
-
-		while ((de = readdir(fdir)) != NULL) {
-			int len;
-			switch (treat_path(dir, de, path, sizeof(path),
-					   baselen, simplify, &len)) {
-			case path_recurse:
-				contents += read_directory_recursive
-					(dir, path, len, 0, simplify);
-				continue;
-			case path_ignored:
-				continue;
-			case path_handled:
-				break;
-			}
-			contents++;
-			if (check_only)
-				goto exit_early;
-			else
-				dir_add_name(dir, path, len);
+	strbuf_add(&path, base, baselen);
+
+	fdir = opendir(path.len ? path.buf : ".");
+	if (!fdir)
+		goto out;
+
+	while ((de = readdir(fdir)) != NULL) {
+		switch (treat_path(dir, de, &path, baselen, simplify)) {
+		case path_recurse:
+			contents += read_directory_recursive(dir, path.buf,
+							     path.len, 0,
+							     simplify);
+			continue;
+		case path_ignored:
+			continue;
+		case path_handled:
+			break;
 		}
-exit_early:
-		closedir(fdir);
+		contents++;
+		if (check_only)
+			break;
+		dir_add_name(dir, path.buf, path.len);
 	}
+	closedir(fdir);
+ out:
+	strbuf_release(&path);
 
 	return contents;
 }
@@ -1002,21 +1253,6 @@ static int cmp_name(const void *p1, const void *p2)
 				  e2->name, e2->len);
 }
 
-/*
- * Return the length of the "simple" part of a path match limiter.
- */
-static int simple_length(const char *match)
-{
-	int len = -1;
-
-	for (;;) {
-		unsigned char c = *match++;
-		len++;
-		if (c == '\0' || is_glob_special(c))
-			return len;
-	}
-}
-
 static struct path_simplify *create_simplify(const char **pathspec)
 {
 	int nr, alloc = 0;
@@ -1051,8 +1287,8 @@ static int treat_leading_path(struct dir_struct *dir,
 			      const char *path, int len,
 			      const struct path_simplify *simplify)
 {
-	char pathbuf[PATH_MAX];
-	int baselen, blen;
+	struct strbuf sb = STRBUF_INIT;
+	int baselen, rc = 0;
 	const char *cp;
 
 	while (len && path[len - 1] == '/')
@@ -1067,19 +1303,22 @@ static int treat_leading_path(struct dir_struct *dir,
 			baselen = len;
 		else
 			baselen = cp - path;
-		memcpy(pathbuf, path, baselen);
-		pathbuf[baselen] = '\0';
-		if (!is_directory(pathbuf))
-			return 0;
-		if (simplify_away(pathbuf, baselen, simplify))
-			return 0;
-		blen = baselen;
-		if (treat_one_path(dir, pathbuf, &blen, simplify,
+		strbuf_setlen(&sb, 0);
+		strbuf_add(&sb, path, baselen);
+		if (!is_directory(sb.buf))
+			break;
+		if (simplify_away(sb.buf, sb.len, simplify))
+			break;
+		if (treat_one_path(dir, &sb, simplify,
 				   DT_DIR, NULL) == path_ignored)
-			return 0; /* do not recurse into it */
-		if (len <= baselen)
-			return 1; /* finished checking */
+			break; /* do not recurse into it */
+		if (len <= baselen) {
+			rc = 1;
+			break; /* finished checking */
+		}
 	}
+	strbuf_release(&sb);
+	return rc;
 }
 
 int read_directory(struct dir_struct *dir, const char *path, int len, const char **pathspec)
@@ -1165,22 +1404,32 @@ int is_empty_dir(const char *path)
 	return ret;
 }
 
-int remove_dir_recursively(struct strbuf *path, int flag)
+static int remove_dir_recurse(struct strbuf *path, int flag, int *kept_up)
 {
 	DIR *dir;
 	struct dirent *e;
-	int ret = 0, original_len = path->len, len;
+	int ret = 0, original_len = path->len, len, kept_down = 0;
 	int only_empty = (flag & REMOVE_DIR_EMPTY_ONLY);
+	int keep_toplevel = (flag & REMOVE_DIR_KEEP_TOPLEVEL);
 	unsigned char submodule_head[20];
 
 	if ((flag & REMOVE_DIR_KEEP_NESTED_GIT) &&
-	    !resolve_gitlink_ref(path->buf, "HEAD", submodule_head))
+	    !resolve_gitlink_ref(path->buf, "HEAD", submodule_head)) {
 		/* Do not descend and nuke a nested git work tree. */
+		if (kept_up)
+			*kept_up = 1;
 		return 0;
+	}
 
+	flag &= ~REMOVE_DIR_KEEP_TOPLEVEL;
 	dir = opendir(path->buf);
-	if (!dir)
-		return rmdir(path->buf);
+	if (!dir) {
+		/* an empty dir could be removed even if it is unreadble */
+		if (!keep_toplevel)
+			return rmdir(path->buf);
+		else
+			return -1;
+	}
 	if (path->buf[original_len - 1] != '/')
 		strbuf_addch(path, '/');
 
@@ -1195,7 +1444,7 @@ int remove_dir_recursively(struct strbuf *path, int flag)
 		if (lstat(path->buf, &st))
 			; /* fall thru */
 		else if (S_ISDIR(st.st_mode)) {
-			if (!remove_dir_recursively(path, only_empty))
+			if (!remove_dir_recurse(path, flag, &kept_down))
 				continue; /* happy */
 		} else if (!only_empty && !unlink(path->buf))
 			continue; /* happy, too */
@@ -1207,20 +1456,36 @@ int remove_dir_recursively(struct strbuf *path, int flag)
 	closedir(dir);
 
 	strbuf_setlen(path, original_len);
-	if (!ret)
+	if (!ret && !keep_toplevel && !kept_down)
 		ret = rmdir(path->buf);
+	else if (kept_up)
+		/*
+		 * report the uplevel that it is not an error that we
+		 * did not rmdir() our directory.
+		 */
+		*kept_up = !ret;
 	return ret;
 }
 
+int remove_dir_recursively(struct strbuf *path, int flag)
+{
+	return remove_dir_recurse(path, flag, NULL);
+}
+
 void setup_standard_excludes(struct dir_struct *dir)
 {
 	const char *path;
+	char *xdg_path;
 
 	dir->exclude_per_dir = ".gitignore";
 	path = git_path("info/exclude");
-	if (!access(path, R_OK))
+	if (!excludes_file) {
+		home_config_paths(NULL, &xdg_path, "ignore");
+		excludes_file = xdg_path;
+	}
+	if (!access_or_warn(path, R_OK))
 		add_excludes_from_file(dir, path);
-	if (excludes_file && !access(excludes_file, R_OK))
+	if (excludes_file && !access_or_warn(excludes_file, R_OK))
 		add_excludes_from_file(dir, excludes_file);
 }
 
@@ -1274,9 +1539,18 @@ int init_pathspec(struct pathspec *pathspec, const char **paths)
 
 		item->match = path;
 		item->len = strlen(path);
-		item->use_wildcard = !no_wildcard(path);
-		if (item->use_wildcard)
-			pathspec->has_wildcard = 1;
+		item->flags = 0;
+		if (limit_pathspec_to_literal()) {
+			item->nowildcard_len = item->len;
+		} else {
+			item->nowildcard_len = simple_length(path);
+			if (item->nowildcard_len < item->len) {
+				pathspec->has_wildcard = 1;
+				if (path[item->nowildcard_len] == '*' &&
+				    no_wildcard(path + item->nowildcard_len + 1))
+					item->flags |= PATHSPEC_ONESTAR;
+			}
+		}
 	}
 
 	qsort(pathspec->items, pathspec->nr,
@@ -1290,3 +1564,11 @@ void free_pathspec(struct pathspec *pathspec)
 	free(pathspec->items);
 	pathspec->items = NULL;
 }
+
+int limit_pathspec_to_literal(void)
+{
+	static int flag = -1;
+	if (flag < 0)
+		flag = git_env_bool(GIT_LITERAL_PATHSPECS_ENVIRONMENT, 0);
+	return flag;
+}