Adding upstream version 1.7.2+ds.upstream/1.7.2+ds

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 790 insertions, 0 deletions

diff --git a/src/util/fs_path.h b/src/util/fs_path.h
new file mode 100644
index 0000000..e5ca673
--- /dev/null
+++ b/src/util/fs_path.h
@@ -0,0 +1,790 @@
+/*
+ * Copyright (C) the libgit2 contributors. All rights reserved.
+ *
+ * This file is part of libgit2, distributed under the GNU GPL v2 with
+ * a Linking Exception. For full terms see the included COPYING file.
+ */
+#ifndef INCLUDE_fs_path_h__
+#define INCLUDE_fs_path_h__
+
+#include "git2_util.h"
+
+#include "posix.h"
+#include "str.h"
+#include "vector.h"
+#include "utf8.h"
+
+/**
+ * Path manipulation utils
+ *
+ * These are path utilities that munge paths without actually
+ * looking at the real filesystem.
+ */
+
+/*
+ * The dirname() function shall take a pointer to a character string
+ * that contains a pathname, and return a pointer to a string that is a
+ * pathname of the parent directory of that file. Trailing '/' characters
+ * in the path are not counted as part of the path.
+ *
+ * If path does not contain a '/', then dirname() shall return a pointer to
+ * the string ".". If path is a null pointer or points to an empty string,
+ * dirname() shall return a pointer to the string "." .
+ *
+ * The `git_fs_path_dirname` implementation is thread safe. The returned
+ * string must be manually free'd.
+ *
+ * The `git_fs_path_dirname_r` implementation writes the dirname to a `git_str`
+ * if the buffer pointer is not NULL.
+ * It returns an error code < 0 if there is an allocation error, otherwise
+ * the length of the dirname (which will be > 0).
+ */
+extern char *git_fs_path_dirname(const char *path);
+extern int git_fs_path_dirname_r(git_str *buffer, const char *path);
+
+/*
+ * This function returns the basename of the file, which is the last
+ * part of its full name given by fname, with the drive letter and
+ * leading directories stripped off. For example, the basename of
+ * c:/foo/bar/file.ext is file.ext, and the basename of a:foo is foo.
+ *
+ * Trailing slashes and backslashes are significant: the basename of
+ * c:/foo/bar/ is an empty string after the rightmost slash.
+ *
+ * The `git_fs_path_basename` implementation is thread safe. The returned
+ * string must be manually free'd.
+ *
+ * The `git_fs_path_basename_r` implementation writes the basename to a `git_str`.
+ * It returns an error code < 0 if there is an allocation error, otherwise
+ * the length of the basename (which will be >= 0).
+ */
+extern char *git_fs_path_basename(const char *path);
+extern int git_fs_path_basename_r(git_str *buffer, const char *path);
+
+/* Return the offset of the start of the basename.  Unlike the other
+ * basename functions, this returns 0 if the path is empty.
+ */
+extern size_t git_fs_path_basename_offset(git_str *buffer);
+
+/**
+ * Find offset to root of path if path has one.
+ *
+ * This will return a number >= 0 which is the offset to the start of the
+ * path, if the path is rooted (i.e. "/rooted/path" returns 0 and
+ * "c:/windows/rooted/path" returns 2).  If the path is not rooted, this
+ * returns -1.
+ */
+extern int git_fs_path_root(const char *path);
+
+/**
+ * Ensure path has a trailing '/'.
+ */
+extern int git_fs_path_to_dir(git_str *path);
+
+/**
+ * Ensure string has a trailing '/' if there is space for it.
+ */
+extern void git_fs_path_string_to_dir(char *path, size_t size);
+
+/**
+ * Taken from git.git; returns nonzero if the given path is "." or "..".
+ */
+GIT_INLINE(int) git_fs_path_is_dot_or_dotdot(const char *name)
+{
+	return (name[0] == '.' &&
+			  (name[1] == '\0' ||
+				(name[1] == '.' && name[2] == '\0')));
+}
+
+#ifdef GIT_WIN32
+GIT_INLINE(int) git_fs_path_is_dot_or_dotdotW(const wchar_t *name)
+{
+	return (name[0] == L'.' &&
+			  (name[1] == L'\0' ||
+				(name[1] == L'.' && name[2] == L'\0')));
+}
+
+#define git_fs_path_is_absolute(p) \
+	(git__isalpha((p)[0]) && (p)[1] == ':' && ((p)[2] == '\\' || (p)[2] == '/'))
+
+#define git_fs_path_is_dirsep(p) \
+	((p) == '/' || (p) == '\\')
+
+/**
+ * Convert backslashes in path to forward slashes.
+ */
+GIT_INLINE(void) git_fs_path_mkposix(char *path)
+{
+	while (*path) {
+		if (*path == '\\')
+			*path = '/';
+
+		path++;
+	}
+}
+#else
+#	define git_fs_path_mkposix(p) /* blank */
+
+#define git_fs_path_is_absolute(p) \
+	((p)[0] == '/')
+
+#define git_fs_path_is_dirsep(p) \
+	((p) == '/')
+
+#endif
+
+/**
+ * Check if string is a relative path (i.e. starts with "./" or "../")
+ */
+GIT_INLINE(int) git_fs_path_is_relative(const char *p)
+{
+	return (p[0] == '.' && (p[1] == '/' || (p[1] == '.' && p[2] == '/')));
+}
+
+/**
+ * Check if string is at end of path segment (i.e. looking at '/' or '\0')
+ */
+GIT_INLINE(int) git_fs_path_at_end_of_segment(const char *p)
+{
+	return !*p || *p == '/';
+}
+
+extern int git__percent_decode(git_str *decoded_out, const char *input);
+
+/**
+ * Extract path from file:// URL.
+ */
+extern int git_fs_path_fromurl(git_str *local_path_out, const char *file_url);
+
+
+/**
+ * Path filesystem utils
+ *
+ * These are path utilities that actually access the filesystem.
+ */
+
+/**
+ * Check if a file exists and can be accessed.
+ * @return true or false
+ */
+extern bool git_fs_path_exists(const char *path);
+
+/**
+ * Check if the given path points to a directory.
+ * @return true or false
+ */
+extern bool git_fs_path_isdir(const char *path);
+
+/**
+ * Check if the given path points to a regular file.
+ * @return true or false
+ */
+extern bool git_fs_path_isfile(const char *path);
+
+/**
+ * Check if the given path points to a symbolic link.
+ * @return true or false
+ */
+extern bool git_fs_path_islink(const char *path);
+
+/**
+ * Check if the given path is a directory, and is empty.
+ */
+extern bool git_fs_path_is_empty_dir(const char *path);
+
+/**
+ * Stat a file and/or link and set error if needed.
+ */
+extern int git_fs_path_lstat(const char *path, struct stat *st);
+
+/**
+ * Check if the parent directory contains the item.
+ *
+ * @param dir Directory to check.
+ * @param item Item that might be in the directory.
+ * @return 0 if item exists in directory, <0 otherwise.
+ */
+extern bool git_fs_path_contains(git_str *dir, const char *item);
+
+/**
+ * Check if the given path contains the given subdirectory.
+ *
+ * @param parent Directory path that might contain subdir
+ * @param subdir Subdirectory name to look for in parent
+ * @return true if subdirectory exists, false otherwise.
+ */
+extern bool git_fs_path_contains_dir(git_str *parent, const char *subdir);
+
+/**
+ * Determine the common directory length between two paths, including
+ * the final path separator.  For example, given paths 'a/b/c/1.txt
+ * and 'a/b/c/d/2.txt', the common directory is 'a/b/c/', and this
+ * will return the length of the string 'a/b/c/', which is 6.
+ *
+ * @param one The first path
+ * @param two The second path
+ * @return The length of the common directory
+ */
+extern size_t git_fs_path_common_dirlen(const char *one, const char *two);
+
+/**
+ * Make the path relative to the given parent path.
+ *
+ * @param path The path to make relative
+ * @param parent The parent path to make path relative to
+ * @return 0 if path was made relative, GIT_ENOTFOUND
+ *         if there was not common root between the paths,
+ *         or <0.
+ */
+extern int git_fs_path_make_relative(git_str *path, const char *parent);
+
+/**
+ * Check if the given path contains the given file.
+ *
+ * @param dir Directory path that might contain file
+ * @param file File name to look for in parent
+ * @return true if file exists, false otherwise.
+ */
+extern bool git_fs_path_contains_file(git_str *dir, const char *file);
+
+/**
+ * Prepend base to unrooted path or just copy path over.
+ *
+ * This will optionally return the index into the path where the "root"
+ * is, either the end of the base directory prefix or the path root.
+ */
+extern int git_fs_path_join_unrooted(
+	git_str *path_out, const char *path, const char *base, ssize_t *root_at);
+
+/**
+ * Removes multiple occurrences of '/' in a row, squashing them into a
+ * single '/'.
+ */
+extern void git_fs_path_squash_slashes(git_str *path);
+
+/**
+ * Clean up path, prepending base if it is not already rooted.
+ */
+extern int git_fs_path_prettify(git_str *path_out, const char *path, const char *base);
+
+/**
+ * Clean up path, prepending base if it is not already rooted and
+ * appending a slash.
+ */
+extern int git_fs_path_prettify_dir(git_str *path_out, const char *path, const char *base);
+
+/**
+ * Get a directory from a path.
+ *
+ * If path is a directory, this acts like `git_fs_path_prettify_dir`
+ * (cleaning up path and appending a '/').  If path is a normal file,
+ * this prettifies it, then removed the filename a la dirname and
+ * appends the trailing '/'.  If the path does not exist, it is
+ * treated like a regular filename.
+ */
+extern int git_fs_path_find_dir(git_str *dir);
+
+/**
+ * Resolve relative references within a path.
+ *
+ * This eliminates "./" and "../" relative references inside a path,
+ * as well as condensing multiple slashes into single ones.  It will
+ * not touch the path before the "ceiling" length.
+ *
+ * Additionally, this will recognize an "c:/" drive prefix or a "xyz://" URL
+ * prefix and not touch that part of the path.
+ */
+extern int git_fs_path_resolve_relative(git_str *path, size_t ceiling);
+
+/**
+ * Apply a relative path to base path.
+ *
+ * Note that the base path could be a filename or a URL and this
+ * should still work.  The relative path is walked segment by segment
+ * with three rules: series of slashes will be condensed to a single
+ * slash, "." will be eaten with no change, and ".." will remove a
+ * segment from the base path.
+ */
+extern int git_fs_path_apply_relative(git_str *target, const char *relpath);
+
+enum {
+	GIT_FS_PATH_DIR_IGNORE_CASE = (1u << 0),
+	GIT_FS_PATH_DIR_PRECOMPOSE_UNICODE = (1u << 1),
+	GIT_FS_PATH_DIR_INCLUDE_DOT_AND_DOTDOT = (1u << 2),
+};
+
+/**
+ * Walk each directory entry, except '.' and '..', calling fn(state).
+ *
+ * @param pathbuf Buffer the function reads the initial directory
+ * 		path from, and updates with each successive entry's name.
+ * @param flags Combination of GIT_FS_PATH_DIR flags.
+ * @param callback Callback for each entry. Passed the `payload` and each
+ *		successive path inside the directory as a full path.  This may
+ *		safely append text to the pathbuf if needed.  Return non-zero to
+ *		cancel iteration (and return value will be propagated back).
+ * @param payload Passed to callback as first argument.
+ * @return 0 on success or error code from OS error or from callback
+ */
+extern int git_fs_path_direach(
+	git_str *pathbuf,
+	uint32_t flags,
+	int (*callback)(void *payload, git_str *path),
+	void *payload);
+
+/**
+ * Sort function to order two paths
+ */
+extern int git_fs_path_cmp(
+	const char *name1, size_t len1, int isdir1,
+	const char *name2, size_t len2, int isdir2,
+	int (*compare)(const char *, const char *, size_t));
+
+/**
+ * Invoke callback up path directory by directory until the ceiling is
+ * reached (inclusive of a final call at the root_path).
+ *
+ * Returning anything other than 0 from the callback function
+ * will stop the iteration and propagate the error to the caller.
+ *
+ * @param pathbuf Buffer the function reads the directory from and
+ *		and updates with each successive name.
+ * @param ceiling Prefix of path at which to stop walking up.  If NULL,
+ *		this will walk all the way up to the root.  If not a prefix of
+ *		pathbuf, the callback will be invoked a single time on the
+ *		original input path.
+ * @param callback Function to invoke on each path.  Passed the `payload`
+ *		and the buffer containing the current path.  The path should not
+ *		be modified in any way. Return non-zero to stop iteration.
+ * @param payload Passed to fn as the first ath.
+ */
+extern int git_fs_path_walk_up(
+	git_str *pathbuf,
+	const char *ceiling,
+	int (*callback)(void *payload, const char *path),
+	void *payload);
+
+
+enum {
+	GIT_FS_PATH_NOTEQUAL = 0,
+	GIT_FS_PATH_EQUAL = 1,
+	GIT_FS_PATH_PREFIX = 2
+};
+
+/*
+ * Determines if a path is equal to or potentially a child of another.
+ * @param parent The possible parent
+ * @param child The possible child
+ */
+GIT_INLINE(int) git_fs_path_equal_or_prefixed(
+	const char *parent,
+	const char *child,
+	ssize_t *prefixlen)
+{
+	const char *p = parent, *c = child;
+	int lastslash = 0;
+
+	while (*p && *c) {
+		lastslash = (*p == '/');
+
+		if (*p++ != *c++)
+			return GIT_FS_PATH_NOTEQUAL;
+	}
+
+	if (*p != '\0')
+		return GIT_FS_PATH_NOTEQUAL;
+
+	if (*c == '\0') {
+		if (prefixlen)
+			*prefixlen = p - parent;
+
+		return GIT_FS_PATH_EQUAL;
+	}
+
+	if (*c == '/' || lastslash) {
+		if (prefixlen)
+			*prefixlen = (p - parent) - lastslash;
+
+		return GIT_FS_PATH_PREFIX;
+	}
+
+	return GIT_FS_PATH_NOTEQUAL;
+}
+
+/* translate errno to libgit2 error code and set error message */
+extern int git_fs_path_set_error(
+	int errno_value, const char *path, const char *action);
+
+/* check if non-ascii characters are present in filename */
+extern bool git_fs_path_has_non_ascii(const char *path, size_t pathlen);
+
+#define GIT_PATH_REPO_ENCODING "UTF-8"
+
+#ifdef __APPLE__
+#define GIT_PATH_NATIVE_ENCODING "UTF-8-MAC"
+#else
+#define GIT_PATH_NATIVE_ENCODING "UTF-8"
+#endif
+
+#ifdef GIT_USE_ICONV
+
+#include <iconv.h>
+
+typedef struct {
+	iconv_t map;
+	git_str buf;
+} git_fs_path_iconv_t;
+
+#define GIT_PATH_ICONV_INIT { (iconv_t)-1, GIT_STR_INIT }
+
+/* Init iconv data for converting decomposed UTF-8 to precomposed */
+extern int git_fs_path_iconv_init_precompose(git_fs_path_iconv_t *ic);
+
+/* Clear allocated iconv data */
+extern void git_fs_path_iconv_clear(git_fs_path_iconv_t *ic);
+
+/*
+ * Rewrite `in` buffer using iconv map if necessary, replacing `in`
+ * pointer internal iconv buffer if rewrite happened.  The `in` pointer
+ * will be left unchanged if no rewrite was needed.
+ */
+extern int git_fs_path_iconv(git_fs_path_iconv_t *ic, const char **in, size_t *inlen);
+
+#endif /* GIT_USE_ICONV */
+
+extern bool git_fs_path_does_decompose_unicode(const char *root);
+
+
+typedef struct git_fs_path_diriter git_fs_path_diriter;
+
+#if defined(GIT_WIN32) && !defined(__MINGW32__)
+
+struct git_fs_path_diriter
+{
+	git_win32_path path;
+	size_t parent_len;
+
+	git_str path_utf8;
+	size_t parent_utf8_len;
+
+	HANDLE handle;
+
+	unsigned int flags;
+
+	WIN32_FIND_DATAW current;
+	unsigned int needs_next;
+};
+
+#define GIT_FS_PATH_DIRITER_INIT { {0}, 0, GIT_STR_INIT, 0, INVALID_HANDLE_VALUE }
+
+#else
+
+struct git_fs_path_diriter
+{
+	git_str path;
+	size_t parent_len;
+
+	unsigned int flags;
+
+	DIR *dir;
+
+#ifdef GIT_USE_ICONV
+	git_fs_path_iconv_t ic;
+#endif
+};
+
+#define GIT_FS_PATH_DIRITER_INIT { GIT_STR_INIT }
+
+#endif
+
+/**
+ * Initialize a directory iterator.
+ *
+ * @param diriter Pointer to a diriter structure that will be setup.
+ * @param path The path that will be iterated over
+ * @param flags Directory reader flags
+ * @return 0 or an error code
+ */
+extern int git_fs_path_diriter_init(
+	git_fs_path_diriter *diriter,
+	const char *path,
+	unsigned int flags);
+
+/**
+ * Advance the directory iterator.  Will return GIT_ITEROVER when
+ * the iteration has completed successfully.
+ *
+ * @param diriter The directory iterator
+ * @return 0, GIT_ITEROVER, or an error code
+ */
+extern int git_fs_path_diriter_next(git_fs_path_diriter *diriter);
+
+/**
+ * Returns the file name of the current item in the iterator.
+ *
+ * @param out Pointer to store the path in
+ * @param out_len Pointer to store the length of the path in
+ * @param diriter The directory iterator
+ * @return 0 or an error code
+ */
+extern int git_fs_path_diriter_filename(
+	const char **out,
+	size_t *out_len,
+	git_fs_path_diriter *diriter);
+
+/**
+ * Returns the full path of the current item in the iterator; that
+ * is the current filename plus the path of the directory that the
+ * iterator was constructed with.
+ *
+ * @param out Pointer to store the path in
+ * @param out_len Pointer to store the length of the path in
+ * @param diriter The directory iterator
+ * @return 0 or an error code
+ */
+extern int git_fs_path_diriter_fullpath(
+	const char **out,
+	size_t *out_len,
+	git_fs_path_diriter *diriter);
+
+/**
+ * Performs an `lstat` on the current item in the iterator.
+ *
+ * @param out Pointer to store the stat data in
+ * @param diriter The directory iterator
+ * @return 0 or an error code
+ */
+extern int git_fs_path_diriter_stat(struct stat *out, git_fs_path_diriter *diriter);
+
+/**
+ * Closes the directory iterator.
+ *
+ * @param diriter The directory iterator
+ */
+extern void git_fs_path_diriter_free(git_fs_path_diriter *diriter);
+
+/**
+ * Load all directory entries (except '.' and '..') into a vector.
+ *
+ * For cases where `git_fs_path_direach()` is not appropriate, this
+ * allows you to load the filenames in a directory into a vector
+ * of strings. That vector can then be sorted, iterated, or whatever.
+ * Remember to free alloc of the allocated strings when you are done.
+ *
+ * @param contents Vector to fill with directory entry names.
+ * @param path The directory to read from.
+ * @param prefix_len When inserting entries, the trailing part of path
+ * 		will be prefixed after this length.  I.e. given path "/a/b" and
+ * 		prefix_len 3, the entries will look like "b/e1", "b/e2", etc.
+ * @param flags Combination of GIT_FS_PATH_DIR flags.
+ */
+extern int git_fs_path_dirload(
+	git_vector *contents,
+	const char *path,
+	size_t prefix_len,
+	uint32_t flags);
+
+
+/* Used for paths to repositories on the filesystem */
+extern bool git_fs_path_is_local_file_url(const char *file_url);
+extern int git_fs_path_from_url_or_path(git_str *local_path_out, const char *url_or_path);
+
+/* Flags to determine path validity in `git_fs_path_isvalid` */
+#define GIT_FS_PATH_REJECT_EMPTY_COMPONENT    (1 << 0)
+#define GIT_FS_PATH_REJECT_TRAVERSAL          (1 << 1)
+#define GIT_FS_PATH_REJECT_SLASH              (1 << 2)
+#define GIT_FS_PATH_REJECT_BACKSLASH          (1 << 3)
+#define GIT_FS_PATH_REJECT_TRAILING_DOT       (1 << 4)
+#define GIT_FS_PATH_REJECT_TRAILING_SPACE     (1 << 5)
+#define GIT_FS_PATH_REJECT_TRAILING_COLON     (1 << 6)
+#define GIT_FS_PATH_REJECT_DOS_PATHS          (1 << 7)
+#define GIT_FS_PATH_REJECT_NT_CHARS           (1 << 8)
+#define GIT_FS_PATH_REJECT_LONG_PATHS         (1 << 9)
+
+#define GIT_FS_PATH_REJECT_MAX                (1 << 9)
+
+/* Default path safety for writing files to disk: since we use the
+ * Win32 "File Namespace" APIs ("\\?\") we need to protect from
+ * paths that the normal Win32 APIs would not write.
+ */
+#ifdef GIT_WIN32
+# define GIT_FS_PATH_REJECT_FILESYSTEM_DEFAULTS \
+	GIT_FS_PATH_REJECT_EMPTY_COMPONENT | \
+	GIT_FS_PATH_REJECT_TRAVERSAL | \
+	GIT_FS_PATH_REJECT_BACKSLASH | \
+	GIT_FS_PATH_REJECT_TRAILING_DOT | \
+	GIT_FS_PATH_REJECT_TRAILING_SPACE | \
+	GIT_FS_PATH_REJECT_TRAILING_COLON | \
+	GIT_FS_PATH_REJECT_DOS_PATHS | \
+	GIT_FS_PATH_REJECT_NT_CHARS
+#else
+# define GIT_FS_PATH_REJECT_FILESYSTEM_DEFAULTS \
+	GIT_FS_PATH_REJECT_EMPTY_COMPONENT | \
+	GIT_FS_PATH_REJECT_TRAVERSAL
+#endif
+
+/**
+ * Validate a filesystem path; with custom callbacks per-character and
+ * per-path component.
+ */
+extern bool git_fs_path_str_is_valid_ext(
+	const git_str *path,
+	unsigned int flags,
+	bool (*validate_char_cb)(char ch, void *payload),
+	bool (*validate_component_cb)(const char *component, size_t len, void *payload),
+	bool (*validate_length_cb)(const char *component, size_t len, size_t utf8_char_len),
+	void *payload);
+
+GIT_INLINE(bool) git_fs_path_is_valid_ext(
+	const char *path,
+	unsigned int flags,
+	bool (*validate_char_cb)(char ch, void *payload),
+	bool (*validate_component_cb)(const char *component, size_t len, void *payload),
+	bool (*validate_length_cb)(const char *component, size_t len, size_t utf8_char_len),
+	void *payload)
+{
+	const git_str str = GIT_STR_INIT_CONST(path, SIZE_MAX);
+	return git_fs_path_str_is_valid_ext(
+		&str,
+		flags,
+		validate_char_cb,
+		validate_component_cb,
+		validate_length_cb,
+		payload);
+}
+
+/**
+ * Validate a filesystem path.  This ensures that the given path is legal
+ * and does not contain any "unsafe" components like path traversal ('.'
+ * or '..'), characters that are inappropriate for lesser filesystems
+ * (trailing ' ' or ':' characters), or filenames ("component names")
+ * that are not supported ('AUX', 'COM1").
+ */
+GIT_INLINE(bool) git_fs_path_is_valid(
+	const char *path,
+	unsigned int flags)
+{
+	const git_str str = GIT_STR_INIT_CONST(path, SIZE_MAX);
+	return git_fs_path_str_is_valid_ext(&str, flags, NULL, NULL, NULL, NULL);
+}
+
+/** Validate a filesystem path in a `git_str`. */
+GIT_INLINE(bool) git_fs_path_str_is_valid(
+	const git_str *path,
+	unsigned int flags)
+{
+	return git_fs_path_str_is_valid_ext(path, flags, NULL, NULL, NULL, NULL);
+}
+
+extern int git_fs_path_validate_str_length_with_suffix(
+	git_str *path,
+	size_t suffix_len);
+
+/**
+ * Validate an on-disk path, taking into account that it will have a
+ * suffix appended (eg, `.lock`).
+ */
+GIT_INLINE(int) git_fs_path_validate_filesystem_with_suffix(
+	const char *path,
+	size_t path_len,
+	size_t suffix_len)
+{
+#ifdef GIT_WIN32
+	size_t path_chars, total_chars;
+
+	path_chars = git_utf8_char_length(path, path_len);
+
+	if (GIT_ADD_SIZET_OVERFLOW(&total_chars, path_chars, suffix_len) ||
+	    total_chars > MAX_PATH) {
+		git_error_set(GIT_ERROR_FILESYSTEM, "path too long: '%s'", path);
+		return -1;
+	}
+	return 0;
+#else
+	GIT_UNUSED(path);
+	GIT_UNUSED(path_len);
+	GIT_UNUSED(suffix_len);
+	return 0;
+#endif
+}
+
+/**
+ * Validate an path on the filesystem.  This ensures that the given
+ * path is valid for the operating system/platform; for example, this
+ * will ensure that the given absolute path is smaller than MAX_PATH on
+ * Windows.
+ *
+ * For paths within the working directory, you should use ensure that
+ * `core.longpaths` is obeyed.  Use `git_fs_path_validate_workdir`.
+ */
+GIT_INLINE(int) git_fs_path_validate_filesystem(
+	const char *path,
+	size_t path_len)
+{
+	return git_fs_path_validate_filesystem_with_suffix(path, path_len, 0);
+}
+
+/**
+ * Convert any backslashes into slashes
+ */
+int git_fs_path_normalize_slashes(git_str *out, const char *path);
+
+bool git_fs_path_supports_symlinks(const char *dir);
+
+typedef enum {
+	GIT_FS_PATH_OWNER_NONE = 0,
+
+	/** The file must be owned by the current user. */
+	GIT_FS_PATH_OWNER_CURRENT_USER = (1 << 0),
+
+	/** The file must be owned by the system account. */
+	GIT_FS_PATH_OWNER_ADMINISTRATOR = (1 << 1),
+
+	/**
+	 * The file may be owned by a system account if the current
+	 * user is in an administrator group. Windows only; this is
+	 * a noop on non-Windows systems.
+	 */
+	GIT_FS_PATH_USER_IS_ADMINISTRATOR = (1 << 2),
+
+	/**
+	 * The file is owned by the current user, who is running `sudo`.
+	 */
+	GIT_FS_PATH_OWNER_RUNNING_SUDO = (1 << 3),
+
+	/** The file may be owned by another user. */
+	GIT_FS_PATH_OWNER_OTHER = (1 << 4)
+} git_fs_path_owner_t;
+
+/**
+ * Sets the mock ownership for files; subsequent calls to
+ * `git_fs_path_owner_is_*` functions will return this data until
+ * cleared with `GIT_FS_PATH_OWNER_NONE`.
+ */
+void git_fs_path__set_owner(git_fs_path_owner_t owner);
+
+/** Verify that the file in question is owned by the given owner. */
+int git_fs_path_owner_is(
+	bool *out,
+	const char *path,
+	git_fs_path_owner_t owner_type);
+
+/**
+ * Verify that the file in question is owned by an administrator or system
+ * account.
+ */
+int git_fs_path_owner_is_system(bool *out, const char *path);
+
+/**
+ * Verify that the file in question is owned by the current user;
+ */
+
+int git_fs_path_owner_is_current_user(bool *out, const char *path);
+
+/**
+ * Search the current PATH for the given executable, returning the full
+ * path if it is found.
+ */
+int git_fs_path_find_executable(git_str *fullpath, const char *executable);
+
+#endif