git/dir-iterator.h
Taylor Blau e00e56a7df dir-iterator: drop unused DIR_ITERATOR_FOLLOW_SYMLINKS
The `FOLLOW_SYMLINKS` flag was added to the dir-iterator API in
fa1da7d2ee (dir-iterator: add flags parameter to dir_iterator_begin,
2019-07-10) in order to follow symbolic links while traversing through a
directory.

`FOLLOW_SYMLINKS` gained its first caller in ff7ccc8c9a (clone: use
dir-iterator to avoid explicit dir traversal, 2019-07-10), but it was
subsequently removed in 6f054f9fb3 (builtin/clone.c: disallow `--local`
clones with symlinks, 2022-07-28).

Since then, we've held on to the code for `DIR_ITERATOR_FOLLOW_SYMLINKS`
in the name of making minimally invasive changes during a security
embargo.

In fact, we even changed the dir-iterator API in bffc762f87
(dir-iterator: prevent top-level symlinks without FOLLOW_SYMLINKS,
2023-01-24) without having any non-test callers of that flag.

Now that we're past those security embargo(s), let's finalize our
cleanup of the `DIR_ITERATOR_FOLLOW_SYMLINKS` code and remove its
implementation since there are no remaining callers.

Signed-off-by: Taylor Blau <me@ttaylorr.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2023-02-16 16:21:56 -08:00

115 lines
3.6 KiB
C

#ifndef DIR_ITERATOR_H
#define DIR_ITERATOR_H
#include "strbuf.h"
/*
* Iterate over a directory tree.
*
* Iterate over a directory tree, recursively, including paths of all
* types and hidden paths. Skip "." and ".." entries and don't follow
* symlinks except for the original path. Note that the original path
* is not included in the iteration.
*
* Every time dir_iterator_advance() is called, update the members of
* the dir_iterator structure to reflect the next path in the
* iteration. The order that paths are iterated over within a
* directory is undefined, directory paths are always given before
* their contents.
*
* A typical iteration looks like this:
*
* int ok;
* unsigned int flags = DIR_ITERATOR_PEDANTIC;
* struct dir_iterator *iter = dir_iterator_begin(path, flags);
*
* if (!iter)
* goto error_handler;
*
* while ((ok = dir_iterator_advance(iter)) == ITER_OK) {
* if (want_to_stop_iteration()) {
* ok = dir_iterator_abort(iter);
* break;
* }
*
* // Access information about the current path:
* if (S_ISDIR(iter->st.st_mode))
* printf("%s is a directory\n", iter->relative_path);
* }
*
* if (ok != ITER_DONE)
* handle_error();
*
* Callers are allowed to modify iter->path while they are working,
* but they must restore it to its original contents before calling
* dir_iterator_advance() again.
*/
/*
* Flags for dir_iterator_begin:
*
* - DIR_ITERATOR_PEDANTIC: override dir-iterator's default behavior
* in case of an error at dir_iterator_advance(), which is to keep
* looking for a next valid entry. With this flag, resources are freed
* and ITER_ERROR is returned immediately. In both cases, a meaningful
* warning is emitted. Note: ENOENT errors are always ignored so that
* the API users may remove files during iteration.
*/
#define DIR_ITERATOR_PEDANTIC (1 << 0)
struct dir_iterator {
/* The current path: */
struct strbuf path;
/*
* The current path relative to the starting path. This part
* of the path always uses "/" characters to separate path
* components:
*/
const char *relative_path;
/* The current basename: */
const char *basename;
/*
* The result of calling lstat() on path.
*/
struct stat st;
};
/*
* Start a directory iteration over path with the combination of
* options specified by flags. On success, return a dir_iterator
* that holds the internal state of the iteration. In case of
* failure, return NULL and set errno accordingly.
*
* The iteration includes all paths under path, not including path
* itself and not including "." or ".." entries.
*
* Parameters are:
* - path is the starting directory. An internal copy will be made.
* - flags is a combination of the possible flags to initialize a
* dir-iterator or 0 for default behavior.
*/
struct dir_iterator *dir_iterator_begin(const char *path, unsigned int flags);
/*
* Advance the iterator to the first or next item and return ITER_OK.
* If the iteration is exhausted, free the dir_iterator and any
* resources associated with it and return ITER_DONE.
*
* It is a bug to use iterator or call this function again after it
* has returned ITER_DONE or ITER_ERROR (which may be returned iff
* the DIR_ITERATOR_PEDANTIC flag was set).
*/
int dir_iterator_advance(struct dir_iterator *iterator);
/*
* End the iteration before it has been exhausted. Free the
* dir_iterator and any associated resources and return ITER_DONE. On
* error, free the dir_iterator and return ITER_ERROR.
*/
int dir_iterator_abort(struct dir_iterator *iterator);
#endif