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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>
This commit is contained in:
Taylor Blau 2023-02-16 13:27:14 -05:00 committed by Junio C Hamano
parent d9d677b2d8
commit e00e56a7df
4 changed files with 6 additions and 66 deletions
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12
dir-iterator.c
View File

@ -112,10 +112,7 @@ static int prepare_next_entry_data(struct dir_iterator_int *iter,
iter->base.basename = iter->base.path.buf +
iter->levels[iter->levels_nr - 1].prefix_len;
if (iter->flags & DIR_ITERATOR_FOLLOW_SYMLINKS)
err = stat(iter->base.path.buf, &iter->base.st);
else
err = lstat(iter->base.path.buf, &iter->base.st);
err = lstat(iter->base.path.buf, &iter->base.st);
saved_errno = errno;
if (err && errno != ENOENT)
@ -213,13 +210,10 @@ struct dir_iterator *dir_iterator_begin(const char *path, unsigned int flags)
iter->flags = flags;
/*
* Note: stat/lstat already checks for NULL or empty strings and
* Note: lstat already checks for NULL or empty strings and
* nonexistent paths.
*/
if (iter->flags & DIR_ITERATOR_FOLLOW_SYMLINKS)
err = stat(iter->base.path.buf, &iter->base.st);
else
err = lstat(iter->base.path.buf, &iter->base.st);
err = lstat(iter->base.path.buf, &iter->base.st);
if (err < 0) {
saved_errno = errno;

20
dir-iterator.h
View File

@ -54,24 +54,8 @@
* 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.
*
* - DIR_ITERATOR_FOLLOW_SYMLINKS: make dir-iterator follow symlinks.
* i.e., linked directories' contents will be iterated over and
* iter->base.st will contain information on the referred files,
* not the symlinks themselves, which is the default behavior. Broken
* symlinks are ignored.
*
* Note: setting DIR_ITERATOR_FOLLOW_SYMLINKS affects resolving the
* starting path as well (e.g., attempting to iterate starting at a
* symbolic link pointing to a directory without FOLLOW_SYMLINKS will
* result in an error).
*
* Warning: circular symlinks are also followed when
* DIR_ITERATOR_FOLLOW_SYMLINKS is set. The iteration may end up with
* an ELOOP if they happen and DIR_ITERATOR_PEDANTIC is set.
*/
#define DIR_ITERATOR_PEDANTIC (1 << 0)
#define DIR_ITERATOR_FOLLOW_SYMLINKS (1 << 1)
struct dir_iterator {
/* The current path: */
@ -88,9 +72,7 @@ struct dir_iterator {
const char *basename;
/*
* The result of calling lstat() on path; or stat(), if the
* DIR_ITERATOR_FOLLOW_SYMLINKS flag was set at
* dir_iterator's initialization.
* The result of calling lstat() on path.
*/
struct stat st;
};

6
t/helper/test-dir-iterator.c
View File

@ -15,7 +15,7 @@ static const char *error_name(int error_number)
/*
* usage:
* tool-test dir-iterator [--follow-symlinks] [--pedantic] directory_path
* tool-test dir-iterator [--pedantic] directory_path
*/
int cmd__dir_iterator(int argc, const char **argv)
{
@ -24,9 +24,7 @@ int cmd__dir_iterator(int argc, const char **argv)
int iter_status;
for (++argv, --argc; *argv && starts_with(*argv, "--"); ++argv, --argc) {
if (strcmp(*argv, "--follow-symlinks") == 0)
flags |= DIR_ITERATOR_FOLLOW_SYMLINKS;
else if (strcmp(*argv, "--pedantic") == 0)
if (strcmp(*argv, "--pedantic") == 0)
flags |= DIR_ITERATOR_PEDANTIC;
else
die("invalid option '%s'", *argv);

34
t/t0066-dir-iterator.sh
View File

@ -131,44 +131,10 @@ test_expect_success SYMLINKS 'dir-iterator should not follow symlinks by default
test_cmp expected-no-follow-sorted-output actual-no-follow-sorted-output
'
test_expect_success SYMLINKS 'dir-iterator should follow symlinks w/ follow flag' '
cat >expected-follow-sorted-output <<-EOF &&
[d] (a) [a] ./dir4/a
[d] (a/f) [f] ./dir4/a/f
[d] (a/f/c) [c] ./dir4/a/f/c
[d] (b) [b] ./dir4/b
[d] (b/c) [c] ./dir4/b/c
[f] (a/d) [d] ./dir4/a/d
[f] (a/e) [e] ./dir4/a/e
EOF
test-tool dir-iterator --follow-symlinks ./dir4 >out &&
sort out >actual-follow-sorted-output &&
test_cmp expected-follow-sorted-output actual-follow-sorted-output
'
test_expect_success SYMLINKS 'dir-iterator does not resolve top-level symlinks' '
test_must_fail test-tool dir-iterator ./dir6 >out &&
grep "ENOTDIR" out
'
test_expect_success SYMLINKS 'dir-iterator resolves top-level symlinks w/ follow flag' '
cat >expected-follow-sorted-output <<-EOF &&
[d] (a) [a] ./dir6/a
[d] (a/f) [f] ./dir6/a/f
[d] (a/f/c) [c] ./dir6/a/f/c
[d] (b) [b] ./dir6/b
[d] (b/c) [c] ./dir6/b/c
[f] (a/d) [d] ./dir6/a/d
[f] (a/e) [e] ./dir6/a/e
EOF
test-tool dir-iterator --follow-symlinks ./dir6 >out &&
sort out >actual-follow-sorted-output &&
test_cmp expected-follow-sorted-output actual-follow-sorted-output
'
test_done