gensquashfs: split glob related code from fstree_from_file.c

The glob function and everything associated is moved to a separate
file, the entry point exposed any the special case handling is removed
from the other callbacks in fstree_from_file.c

Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>

4 files changed, 278 insertions, 278 deletions

diff --git a/bin/gensquashfs/Makemodule.am b/bin/gensquashfs/Makemodule.am
index fd39aaf..0bb2122 100644
--- a/bin/gensquashfs/Makemodule.am
+++ b/bin/gensquashfs/Makemodule.am
@@ -3,7 +3,7 @@ gensquashfs_SOURCES = bin/gensquashfs/src/mkfs.c bin/gensquashfs/src/mkfs.h \
 	bin/gensquashfs/src/dirscan_xattr.c bin/gensquashfs/src/filemap_xattr.c\
 	bin/gensquashfs/src/fstree_from_file.c \
 	bin/gensquashfs/src/fstree_from_dir.c \
-	bin/gensquashfs/src/sort_by_file.c
+	bin/gensquashfs/src/sort_by_file.c bin/gensquashfs/src/glob.c
 gensquashfs_LDADD = libcommon.a libsquashfs.la libfstree.a libio.a
 gensquashfs_LDADD += libutil.a libcompat.a $(LZO_LIBS) $(PTHREAD_LIBS)
 gensquashfs_CPPFLAGS = $(AM_CPPFLAGS)
@@ -31,6 +31,7 @@ test_filemap_xattr_LDADD += libio.a libcompat.a
 test_fstree_from_file_SOURCES = bin/gensquashfs/test/fstree_from_file.c \
 				bin/gensquashfs/src/fstree_from_file.c \
 				bin/gensquashfs/src/fstree_from_dir.c \
+				bin/gensquashfs/src/glob.c \
 				bin/gensquashfs/src/mkfs.h
 test_fstree_from_file_CPPFLAGS = $(AM_CPPFLAGS)
 test_fstree_from_file_CPPFLAGS += -I$(top_srcdir)/bin/gensquashfs/src
@@ -41,6 +42,7 @@ test_fstree_from_file_LDADD = libcommon.a libfstree.a libio.a libutil.a \
 test_fstree_glob1_SOURCES = bin/gensquashfs/test/fstree_glob1.c \
 				bin/gensquashfs/src/fstree_from_file.c \
 				bin/gensquashfs/src/fstree_from_dir.c \
+				bin/gensquashfs/src/glob.c \
 				bin/gensquashfs/src/mkfs.h
 test_fstree_glob1_CPPFLAGS = $(AM_CPPFLAGS) -I$(top_srcdir)/bin/gensquashfs/src
 test_fstree_glob1_CPPFLAGS += -DTESTPATH=$(GENDATADIR)
@@ -50,6 +52,7 @@ test_sort_file_SOURCES = bin/gensquashfs/test/sort_file.c \
 				bin/gensquashfs/src/fstree_from_file.c \
 				bin/gensquashfs/src/fstree_from_dir.c \
 				bin/gensquashfs/src/sort_by_file.c \
+				bin/gensquashfs/src/glob.c \
 				bin/gensquashfs/src/mkfs.h
 test_sort_file_CPPFLAGS = $(AM_CPPFLAGS) -I$(top_srcdir)/bin/gensquashfs/src
 test_sort_file_LDADD = libcommon.a libfstree.a libio.a libutil.a libcompat.a
@@ -57,6 +60,7 @@ test_sort_file_LDADD = libcommon.a libfstree.a libio.a libutil.a libcompat.a
 fstree_fuzz_SOURCES = bin/gensquashfs/test/fstree_fuzz.c \
 			bin/gensquashfs/src/fstree_from_file.c \
 			bin/gensquashfs/src/fstree_from_dir.c \
+			bin/gensquashfs/src/glob.c \
 			bin/gensquashfs/src/mkfs.h
 fstree_fuzz_CPPFLAGS = $(AM_CPPFLAGS) -I$(top_srcdir)/bin/gensquashfs/src
 fstree_fuzz_LDADD = libcommon.a libfstree.a libio.a libutil.a libcompat.a
diff --git a/bin/gensquashfs/src/fstree_from_file.c b/bin/gensquashfs/src/fstree_from_file.c
index 318c129..d4d77a7 100644
--- a/bin/gensquashfs/src/fstree_from_file.c
+++ b/bin/gensquashfs/src/fstree_from_file.c
@@ -4,45 +4,11 @@
  *
  * Copyright (C) 2019 David Oberhollenzer <goliath@infraroot.at>
  */
-#include "config.h"
-
-#include "util/util.h"
-#include "io/file.h"
-#include "compat.h"
 #include "mkfs.h"
 
-#include <stdlib.h>
-#include <string.h>
-#include <assert.h>
-#include <errno.h>
-#include <ctype.h>
-
-static const struct {
-	const char *name;
-	unsigned int clear_flag;
-	unsigned int set_flag;
-} glob_scan_flags[] = {
-	{ "-type b", DIR_SCAN_NO_BLK, 0 },
-	{ "-type c", DIR_SCAN_NO_CHR, 0 },
-	{ "-type d", DIR_SCAN_NO_DIR, 0 },
-	{ "-type p", DIR_SCAN_NO_FIFO, 0 },
-	{ "-type f", DIR_SCAN_NO_FILE, 0 },
-	{ "-type l", DIR_SCAN_NO_SLINK, 0 },
-	{ "-type s", DIR_SCAN_NO_SOCK, 0 },
-	{ "-xdev", 0, DIR_SCAN_ONE_FILESYSTEM },
-	{ "-mount", 0, DIR_SCAN_ONE_FILESYSTEM },
-	{ "-keeptime", 0, DIR_SCAN_KEEP_TIME },
-	{ "-nonrecursive", 0, DIR_SCAN_NO_RECURSION },
-};
-
 static int add_generic(fstree_t *fs, const char *filename, size_t line_num,
-		       const char *path, struct stat *sb,
-		       const char *basepath, unsigned int glob_flags,
-		       const char *extra)
+		       const char *path, struct stat *sb, const char *extra)
 {
-	(void)basepath;
-	(void)glob_flags;
-
 	if (fstree_add_generic(fs, path, sb, extra) == NULL) {
 		fprintf(stderr, "%s: " PRI_SZ ": %s: %s\n",
 			filename, line_num, path, strerror(errno));
@@ -53,8 +19,7 @@ static int add_generic(fstree_t *fs, const char *filename, size_t line_num,
 }
 
 static int add_device(fstree_t *fs, const char *filename, size_t line_num,
-		      const char *path, struct stat *sb, const char *basepath,
-		      unsigned int glob_flags, const char *extra)
+		      const char *path, struct stat *sb, const char *extra)
 {
 	unsigned int maj, min;
 	char c;
@@ -77,28 +42,22 @@ static int add_device(fstree_t *fs, const char *filename, size_t line_num,
 	}
 
 	sb->st_rdev = makedev(maj, min);
-	return add_generic(fs, filename, line_num, path, sb, basepath,
-			   glob_flags, NULL);
+	return add_generic(fs, filename, line_num, path, sb, NULL);
 }
 
 static int add_file(fstree_t *fs, const char *filename, size_t line_num,
-		    const char *path, struct stat *basic, const char *basepath,
-		    unsigned int glob_flags, const char *extra)
+		    const char *path, struct stat *basic, const char *extra)
 {
 	if (extra == NULL || *extra == '\0')
 		extra = path;
 
-	return add_generic(fs, filename, line_num, path, basic,
-			   basepath, glob_flags, extra);
+	return add_generic(fs, filename, line_num, path, basic, extra);
 }
 
 static int add_hard_link(fstree_t *fs, const char *filename, size_t line_num,
 			 const char *path, struct stat *basic,
-			 const char *basepath, unsigned int glob_flags,
 			 const char *extra)
 {
-	(void)basepath;
-	(void)glob_flags;
 	(void)basic;
 
 	if (fstree_add_hard_link(fs, path, extra) == NULL) {
@@ -109,233 +68,21 @@ static int add_hard_link(fstree_t *fs, const char *filename, size_t line_num,
 	return 0;
 }
 
-static size_t name_string_length(const char *str)
-{
-	size_t len = 0;
-	int start;
-
-	if (*str == '"' || *str == '\'') {
-		start = *str;
-		++len;
-
-		while (str[len] != '\0' && str[len] != start)
-			++len;
-
-		if (str[len] == start)
-			++len;
-	} else {
-		while (str[len] != '\0' && !isspace(str[len]))
-			++len;
-	}
-
-	return len;
-}
-
-static void quote_remove(char *str)
-{
-	char *dst = str;
-	int start = *(str++);
-
-	if (start != '\'' && start != '"')
-		return;
-
-	while (*str != start && *str != '\0')
-		*(dst++) = *(str++);
-
-	*(dst++) = '\0';
-}
-
-static int glob_files(fstree_t *fs, const char *filename, size_t line_num,
-		      const char *path, struct stat *basic,
-		      const char *basepath, unsigned int glob_flags,
-		      const char *extra)
-{
-	char *name_pattern = NULL, *prefix = NULL;
-	unsigned int scan_flags = 0, all_flags;
-	dir_iterator_t *dir = NULL;
-	bool first_clear_flag;
-	size_t i, count, len;
-	dir_tree_cfg_t cfg;
-	tree_node_t *root;
-	int ret;
-
-	/* fetch the actual target node */
-	root = fstree_get_node_by_path(fs, fs->root, path, true, false);
-	if (root == NULL) {
-		fprintf(stderr, "%s: " PRI_SZ ": %s: %s\n",
-			filename, line_num, path, strerror(errno));
-		return -1;
-	}
-
-	if (!S_ISDIR(root->mode)) {
-		fprintf(stderr, "%s: " PRI_SZ ": %s is not a directoy!\n",
-			filename, line_num, path);
-		return -1;
-	}
-
-	prefix = fstree_get_path(root);
-	if (canonicalize_name(prefix) != 0) {
-		fprintf(stderr, "%s: " PRI_SZ ": error cannonicalizing `%s`!\n",
-			filename, line_num, prefix);
-		free(prefix);
-		return -1;
-	}
-
-	/* process options */
-	first_clear_flag = true;
-
-	all_flags = DIR_SCAN_NO_BLK | DIR_SCAN_NO_CHR | DIR_SCAN_NO_DIR |
-		DIR_SCAN_NO_FIFO | DIR_SCAN_NO_FILE | DIR_SCAN_NO_SLINK |
-		DIR_SCAN_NO_SOCK;
-
-	while (extra != NULL && *extra != '\0') {
-		count = sizeof(glob_scan_flags) / sizeof(glob_scan_flags[0]);
-
-		for (i = 0; i < count; ++i) {
-			len = strlen(glob_scan_flags[i].name);
-			if (strncmp(extra, glob_scan_flags[i].name, len) != 0)
-				continue;
-
-			if (isspace(extra[len])) {
-				extra += len;
-				while (isspace(*extra))
-					++extra;
-				break;
-			}
-		}
-
-		if (i < count) {
-			if (glob_scan_flags[i].clear_flag != 0 &&
-			    first_clear_flag) {
-				scan_flags |= all_flags;
-				first_clear_flag = false;
-			}
-
-			scan_flags &= ~(glob_scan_flags[i].clear_flag);
-			scan_flags |= glob_scan_flags[i].set_flag;
-			continue;
-		}
-
-		if (strncmp(extra, "-name", 5) == 0 && isspace(extra[5])) {
-			for (extra += 5; isspace(*extra); ++extra)
-				;
-
-			len = name_string_length(extra);
-
-			free(name_pattern);
-			name_pattern = strndup(extra, len);
-			extra += len;
-
-			while (isspace(*extra))
-				++extra;
-
-			quote_remove(name_pattern);
-			continue;
-		}
-
-		if (strncmp(extra, "-path", 5) == 0 && isspace(extra[5])) {
-			for (extra += 5; isspace(*extra); ++extra)
-				;
-
-			len = name_string_length(extra);
-
-			free(name_pattern);
-			name_pattern = strndup(extra, len);
-			extra += len;
-
-			while (isspace(*extra))
-				++extra;
-
-			quote_remove(name_pattern);
-			glob_flags |= DIR_SCAN_MATCH_FULL_PATH;
-			continue;
-		}
-
-		if (extra[0] == '-') {
-			if (extra[1] == '-' && isspace(extra[2])) {
-				extra += 2;
-				while (isspace(*extra))
-					++extra;
-				break;
-			}
-
-			fprintf(stderr, "%s: " PRI_SZ ": unknown option.\n",
-				filename, line_num);
-			free(name_pattern);
-			free(prefix);
-			return -1;
-		} else {
-			break;
-		}
-	}
-
-	if (extra != NULL && *extra == '\0')
-		extra = NULL;
-
-	/* do the scan */
-	memset(&cfg, 0, sizeof(cfg));
-	cfg.flags = scan_flags | glob_flags;
-	cfg.def_mtime = basic->st_mtime;
-	cfg.def_uid = basic->st_uid;
-	cfg.def_gid = basic->st_gid;
-	cfg.def_mode = basic->st_mode;
-	cfg.prefix = prefix;
-	cfg.name_pattern = name_pattern;
-
-	if (basepath == NULL) {
-		dir = dir_tree_iterator_create(extra == NULL ? "." : extra,
-					       &cfg);
-	} else {
-		size_t plen = strlen(basepath);
-		size_t slen = strlen(extra);
-		char *temp = calloc(1, plen + 1 + slen + 1);
-
-		if (temp == NULL) {
-			fprintf(stderr, "%s: " PRI_SZ ": allocation failure.\n",
-				filename, line_num);
-		} else {
-			memcpy(temp, basepath, plen);
-			temp[plen] = '/';
-			memcpy(temp + plen + 1, extra, slen);
-			temp[plen + 1 + slen] = '\0';
-
-			dir = dir_tree_iterator_create(temp, &cfg);
-		}
-
-		free(temp);
-	}
-
-	if (dir != NULL) {
-		ret = fstree_from_dir(fs, dir);
-		sqfs_drop(dir);
-	} else {
-		ret = -1;
-	}
-
-	free(name_pattern);
-	free(prefix);
-	return ret;
-}
-
 static const struct callback_t {
 	const char *keyword;
 	unsigned int mode;
 	bool need_extra;
-	bool is_glob;
 	bool allow_root;
 	int (*callback)(fstree_t *fs, const char *filename, size_t line_num,
-			const char *path, struct stat *sb,
-			const char *basepath, unsigned int glob_flags,
-			const char *extra);
+			const char *path, struct stat *sb, const char *extra);
 } file_list_hooks[] = {
-	{ "dir", S_IFDIR, false, false, true, add_generic },
-	{ "slink", S_IFLNK, true, false, false, add_generic },
-	{ "link", 0, true, false, false, add_hard_link },
-	{ "nod", 0, true, false, false, add_device },
-	{ "pipe", S_IFIFO, false, false, false, add_generic },
-	{ "sock", S_IFSOCK, false, false, false, add_generic },
-	{ "file", S_IFREG, false, false, false, add_file },
-	{ "glob", 0, false, true, true, glob_files },
+	{ "dir", S_IFDIR, false, true, add_generic },
+	{ "slink", S_IFLNK, true, false, add_generic },
+	{ "link", 0, true, false, add_hard_link },
+	{ "nod", 0, true,  false, add_device },
+	{ "pipe", S_IFIFO, false, false, add_generic },
+	{ "sock", S_IFSOCK, false, false, add_generic },
+	{ "file", S_IFREG, false, false, add_file },
 };
 
 #define NUM_HOOKS (sizeof(file_list_hooks) / sizeof(file_list_hooks[0]))
@@ -414,6 +161,7 @@ static int handle_line(fstree_t *fs, const char *filename,
 	const struct callback_t *cb = NULL;
 	unsigned int glob_flags = 0;
 	sqfs_u32 uid, gid, mode;
+	bool is_glob = false;
 	struct stat sb;
 	char *path;
 
@@ -429,8 +177,14 @@ static int handle_line(fstree_t *fs, const char *filename,
 		}
 	}
 
-	if (cb == NULL)
-		goto fail_kw;
+	if (cb == NULL) {
+		if (strncmp("glob", line, 4) == 0 && isspace(line[4])) {
+			line = skip_space(line + 4);
+			is_glob = true;
+		} else {
+			goto fail_kw;
+		}
+	}
 
 	if ((line = read_str(line, &path)) == NULL)
 		goto fail_ent;
@@ -438,10 +192,10 @@ static int handle_line(fstree_t *fs, const char *filename,
 	if (canonicalize_name(path))
 		goto fail_ent;
 
-	if (*path == '\0' && !cb->allow_root)
+	if (*path == '\0' && !(is_glob || cb->allow_root))
 		goto fail_root;
 
-	if (cb->is_glob && *line == '*') {
+	if (is_glob && *line == '*') {
 		++line;
 		mode = 0;
 		glob_flags |= DIR_SCAN_KEEP_MODE;
@@ -453,7 +207,7 @@ static int handle_line(fstree_t *fs, const char *filename,
 	if ((line = skip_space(line)) == NULL)
 		goto fail_ent;
 
-	if (cb->is_glob && *line == '*') {
+	if (is_glob && *line == '*') {
 		++line;
 		uid = 0;
 		glob_flags |= DIR_SCAN_KEEP_UID;
@@ -465,7 +219,7 @@ static int handle_line(fstree_t *fs, const char *filename,
 	if ((line = skip_space(line)) == NULL)
 		goto fail_ent;
 
-	if (cb->is_glob && *line == '*') {
+	if (is_glob && *line == '*') {
 		++line;
 		gid = 0;
 		glob_flags |= DIR_SCAN_KEEP_GID;
@@ -477,21 +231,25 @@ static int handle_line(fstree_t *fs, const char *filename,
 	if ((line = skip_space(line)) != NULL && *line != '\0')
 		extra = line;
 
-	if (cb->need_extra && extra == NULL)
+	if (!is_glob && cb->need_extra && extra == NULL)
 		goto fail_no_extra;
 
 	/* forward to callback */
 	memset(&sb, 0, sizeof(sb));
 	sb.st_mtime = fs->defaults.mtime;
-	sb.st_mode = mode | cb->mode;
+	sb.st_mode = mode | (is_glob ? 0 : cb->mode);
 	sb.st_uid = uid;
 	sb.st_gid = gid;
 
-	return cb->callback(fs, filename, line_num, path,
-			    &sb, basepath, glob_flags, extra);
+	if (is_glob) {
+		return glob_files(fs, filename, line_num, path, &sb,
+				  basepath, glob_flags, extra);
+	}
+
+	return cb->callback(fs, filename, line_num, path, &sb, extra);
 fail_root:
 	fprintf(stderr, "%s: " PRI_SZ ": cannot use / as argument for %s.\n",
-		filename, line_num, cb->keyword);
+		filename, line_num, is_glob ? "glob" : cb->keyword);
 	return -1;
 fail_no_extra:
 	fprintf(stderr, "%s: " PRI_SZ ": missing argument for %s.\n",
diff --git a/bin/gensquashfs/src/glob.c b/bin/gensquashfs/src/glob.c
new file mode 100644
index 0000000..c95d06d
--- /dev/null
+++ b/bin/gensquashfs/src/glob.c
@@ -0,0 +1,233 @@
+/* SPDX-License-Identifier: GPL-3.0-or-later */
+/*
+ * glob.c
+ *
+ * Copyright (C) 2019 David Oberhollenzer <goliath@infraroot.at>
+ */
+#include "mkfs.h"
+
+static const struct {
+	const char *name;
+	unsigned int clear_flag;
+	unsigned int set_flag;
+} glob_scan_flags[] = {
+	{ "-type b", DIR_SCAN_NO_BLK, 0 },
+	{ "-type c", DIR_SCAN_NO_CHR, 0 },
+	{ "-type d", DIR_SCAN_NO_DIR, 0 },
+	{ "-type p", DIR_SCAN_NO_FIFO, 0 },
+	{ "-type f", DIR_SCAN_NO_FILE, 0 },
+	{ "-type l", DIR_SCAN_NO_SLINK, 0 },
+	{ "-type s", DIR_SCAN_NO_SOCK, 0 },
+	{ "-xdev", 0, DIR_SCAN_ONE_FILESYSTEM },
+	{ "-mount", 0, DIR_SCAN_ONE_FILESYSTEM },
+	{ "-keeptime", 0, DIR_SCAN_KEEP_TIME },
+	{ "-nonrecursive", 0, DIR_SCAN_NO_RECURSION },
+};
+
+static size_t name_string_length(const char *str)
+{
+	size_t len = 0;
+	int start;
+
+	if (*str == '"' || *str == '\'') {
+		start = *str;
+		++len;
+
+		while (str[len] != '\0' && str[len] != start)
+			++len;
+
+		if (str[len] == start)
+			++len;
+	} else {
+		while (str[len] != '\0' && !isspace(str[len]))
+			++len;
+	}
+
+	return len;
+}
+
+static void quote_remove(char *str)
+{
+	char *dst = str;
+	int start = *(str++);
+
+	if (start != '\'' && start != '"')
+		return;
+
+	while (*str != start && *str != '\0')
+		*(dst++) = *(str++);
+
+	*(dst++) = '\0';
+}
+
+int glob_files(fstree_t *fs, const char *filename, size_t line_num,
+	       const char *path, struct stat *basic,
+	       const char *basepath, unsigned int glob_flags,
+	       const char *extra)
+{
+	char *name_pattern = NULL, *prefix = NULL;
+	unsigned int scan_flags = 0, all_flags;
+	dir_iterator_t *dir = NULL;
+	bool first_clear_flag;
+	size_t i, count, len;
+	dir_tree_cfg_t cfg;
+	tree_node_t *root;
+	int ret;
+
+	/* fetch the actual target node */
+	root = fstree_get_node_by_path(fs, fs->root, path, true, false);
+	if (root == NULL) {
+		fprintf(stderr, "%s: " PRI_SZ ": %s: %s\n",
+			filename, line_num, path, strerror(errno));
+		return -1;
+	}
+
+	if (!S_ISDIR(root->mode)) {
+		fprintf(stderr, "%s: " PRI_SZ ": %s is not a directoy!\n",
+			filename, line_num, path);
+		return -1;
+	}
+
+	prefix = fstree_get_path(root);
+	if (canonicalize_name(prefix) != 0) {
+		fprintf(stderr, "%s: " PRI_SZ ": error cannonicalizing `%s`!\n",
+			filename, line_num, prefix);
+		free(prefix);
+		return -1;
+	}
+
+	/* process options */
+	first_clear_flag = true;
+
+	all_flags = DIR_SCAN_NO_BLK | DIR_SCAN_NO_CHR | DIR_SCAN_NO_DIR |
+		DIR_SCAN_NO_FIFO | DIR_SCAN_NO_FILE | DIR_SCAN_NO_SLINK |
+		DIR_SCAN_NO_SOCK;
+
+	while (extra != NULL && *extra != '\0') {
+		count = sizeof(glob_scan_flags) / sizeof(glob_scan_flags[0]);
+
+		for (i = 0; i < count; ++i) {
+			len = strlen(glob_scan_flags[i].name);
+			if (strncmp(extra, glob_scan_flags[i].name, len) != 0)
+				continue;
+
+			if (isspace(extra[len])) {
+				extra += len;
+				while (isspace(*extra))
+					++extra;
+				break;
+			}
+		}
+
+		if (i < count) {
+			if (glob_scan_flags[i].clear_flag != 0 &&
+			    first_clear_flag) {
+				scan_flags |= all_flags;
+				first_clear_flag = false;
+			}
+
+			scan_flags &= ~(glob_scan_flags[i].clear_flag);
+			scan_flags |= glob_scan_flags[i].set_flag;
+			continue;
+		}
+
+		if (strncmp(extra, "-name", 5) == 0 && isspace(extra[5])) {
+			for (extra += 5; isspace(*extra); ++extra)
+				;
+
+			len = name_string_length(extra);
+
+			free(name_pattern);
+			name_pattern = strndup(extra, len);
+			extra += len;
+
+			while (isspace(*extra))
+				++extra;
+
+			quote_remove(name_pattern);
+			continue;
+		}
+
+		if (strncmp(extra, "-path", 5) == 0 && isspace(extra[5])) {
+			for (extra += 5; isspace(*extra); ++extra)
+				;
+
+			len = name_string_length(extra);
+
+			free(name_pattern);
+			name_pattern = strndup(extra, len);
+			extra += len;
+
+			while (isspace(*extra))
+				++extra;
+
+			quote_remove(name_pattern);
+			glob_flags |= DIR_SCAN_MATCH_FULL_PATH;
+			continue;
+		}
+
+		if (extra[0] == '-') {
+			if (extra[1] == '-' && isspace(extra[2])) {
+				extra += 2;
+				while (isspace(*extra))
+					++extra;
+				break;
+			}
+
+			fprintf(stderr, "%s: " PRI_SZ ": unknown option.\n",
+				filename, line_num);
+			free(name_pattern);
+			free(prefix);
+			return -1;
+		} else {
+			break;
+		}
+	}
+
+	if (extra != NULL && *extra == '\0')
+		extra = NULL;
+
+	/* do the scan */
+	memset(&cfg, 0, sizeof(cfg));
+	cfg.flags = scan_flags | glob_flags;
+	cfg.def_mtime = basic->st_mtime;
+	cfg.def_uid = basic->st_uid;
+	cfg.def_gid = basic->st_gid;
+	cfg.def_mode = basic->st_mode;
+	cfg.prefix = prefix;
+	cfg.name_pattern = name_pattern;
+
+	if (basepath == NULL) {
+		dir = dir_tree_iterator_create(extra == NULL ? "." : extra,
+					       &cfg);
+	} else {
+		size_t plen = strlen(basepath);
+		size_t slen = strlen(extra);
+		char *temp = calloc(1, plen + 1 + slen + 1);
+
+		if (temp == NULL) {
+			fprintf(stderr, "%s: " PRI_SZ ": allocation failure.\n",
+				filename, line_num);
+		} else {
+			memcpy(temp, basepath, plen);
+			temp[plen] = '/';
+			memcpy(temp + plen + 1, extra, slen);
+			temp[plen + 1 + slen] = '\0';
+
+			dir = dir_tree_iterator_create(temp, &cfg);
+		}
+
+		free(temp);
+	}
+
+	if (dir != NULL) {
+		ret = fstree_from_dir(fs, dir);
+		sqfs_drop(dir);
+	} else {
+		ret = -1;
+	}
+
+	free(name_pattern);
+	free(prefix);
+	return ret;
+}
diff --git a/bin/gensquashfs/src/mkfs.h b/bin/gensquashfs/src/mkfs.h
index 9205b7b..6c95588 100644
--- a/bin/gensquashfs/src/mkfs.h
+++ b/bin/gensquashfs/src/mkfs.h
@@ -124,4 +124,9 @@ int fstree_from_dir(fstree_t *fs, dir_iterator_t *dir);
 
 int fstree_sort_files(fstree_t *fs, istream_t *sortfile);
 
+int glob_files(fstree_t *fs, const char *filename, size_t line_num,
+	       const char *path, struct stat *basic,
+	       const char *basepath, unsigned int glob_flags,
+	       const char *extra);
+
 #endif /* MKFS_H */