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path-util: introduce path_glob_can_match()

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This commit is contained in:
Yu Watanabe 2022-08-17 06:43:37 +09:00
parent 7177ac4572
commit 3b703fe269
3 changed files with 102 additions and 0 deletions
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62
src/basic/path-util.c
View file

@ -1,6 +1,7 @@
/* SPDX-License-Identifier: LGPL-2.1-or-later */
#include <errno.h>
#include <fnmatch.h>
#include <limits.h>
#include <stdio.h>
#include <stdlib.h>
@ -17,6 +18,7 @@
#include "extract-word.h"
#include "fd-util.h"
#include "fs-util.h"
#include "glob-util.h"
#include "log.h"
#include "macro.h"
#include "path-util.h"
@ -1310,3 +1312,63 @@ bool prefixed_path_strv_contains(char **l, const char *path) {
return false;
}
int path_glob_can_match(const char *pattern, const char *prefix, char **ret) {
assert(pattern);
assert(prefix);
for (const char *a = pattern, *b = prefix;;) {
_cleanup_free_ char *g = NULL, *h = NULL;
const char *p, *q;
int r, s;
r = path_find_first_component(&a, /* accept_dot_dot = */ false, &p);
if (r < 0)
return r;
s = path_find_first_component(&b, /* accept_dot_dot = */ false, &q);
if (s < 0)
return s;
if (s == 0) {
/* The pattern matches the prefix. */
if (ret) {
char *t;
t = path_join(prefix, p);
if (!t)
return -ENOMEM;
*ret = t;
}
return true;
}
if (r == 0)
break;
if (r == s && strneq(p, q, r))
continue; /* common component. Check next. */
g = strndup(p, r);
if (!g)
return -ENOMEM;
if (!string_is_glob(g))
break;
/* We found a glob component. Check if the glob pattern matches the prefix component. */
h = strndup(q, s);
if (!h)
return -ENOMEM;
if (fnmatch(g, h, 0) != 0)
break;
}
/* The pattern does not match the prefix. */
if (ret)
*ret = NULL;
return false;
}

2
src/basic/path-util.h
View file

@ -196,3 +196,5 @@ static inline const char *empty_to_root(const char *path) {
bool path_strv_contains(char **l, const char *path);
bool prefixed_path_strv_contains(char **l, const char *path);
int path_glob_can_match(const char *pattern, const char *prefix, char **ret);

38
src/test/test-path-util.c
View file

@ -1027,6 +1027,44 @@ TEST(path_startswith_strv) {
assert_se(streq_ptr(path_startswith_strv("/foo2/bar", STRV_MAKE("/foo/quux", "", "/zzz")), NULL));
}
static void test_path_glob_can_match_one(const char *pattern, const char *prefix, const char *expected) {
_cleanup_free_ char *result = NULL;
log_debug("%s(%s, %s, %s)", __func__, pattern, prefix, strnull(expected));
assert_se(path_glob_can_match(pattern, prefix, &result) == !!expected);
assert_se(streq_ptr(result, expected));
}
TEST(path_glob_can_match) {
test_path_glob_can_match_one("/foo/hoge/aaa", "/foo/hoge/aaa/bbb", NULL);
test_path_glob_can_match_one("/foo/hoge/aaa", "/foo/hoge/aaa", "/foo/hoge/aaa");
test_path_glob_can_match_one("/foo/hoge/aaa", "/foo/hoge", "/foo/hoge/aaa");
test_path_glob_can_match_one("/foo/hoge/aaa", "/foo", "/foo/hoge/aaa");
test_path_glob_can_match_one("/foo/hoge/aaa", "/", "/foo/hoge/aaa");
test_path_glob_can_match_one("/foo/*/aaa", "/foo/hoge/aaa/bbb", NULL);
test_path_glob_can_match_one("/foo/*/aaa", "/foo/hoge/aaa", "/foo/hoge/aaa");
test_path_glob_can_match_one("/foo/*/aaa", "/foo/hoge", "/foo/hoge/aaa");
test_path_glob_can_match_one("/foo/*/aaa", "/foo", "/foo/*/aaa");
test_path_glob_can_match_one("/foo/*/aaa", "/", "/foo/*/aaa");
test_path_glob_can_match_one("/foo/*/*/aaa", "/foo/xxx/yyy/aaa/bbb", NULL);
test_path_glob_can_match_one("/foo/*/*/aaa", "/foo/xxx/yyy/aaa", "/foo/xxx/yyy/aaa");
test_path_glob_can_match_one("/foo/*/*/aaa", "/foo/xxx/yyy", "/foo/xxx/yyy/aaa");
test_path_glob_can_match_one("/foo/*/*/aaa", "/foo/xxx", "/foo/xxx/*/aaa");
test_path_glob_can_match_one("/foo/*/*/aaa", "/foo", "/foo/*/*/aaa");
test_path_glob_can_match_one("/foo/*/*/aaa", "/", "/foo/*/*/aaa");
test_path_glob_can_match_one("/foo/*/aaa/*", "/foo/xxx/aaa/bbb/ccc", NULL);
test_path_glob_can_match_one("/foo/*/aaa/*", "/foo/xxx/aaa/bbb", "/foo/xxx/aaa/bbb");
test_path_glob_can_match_one("/foo/*/aaa/*", "/foo/xxx/ccc", NULL);
test_path_glob_can_match_one("/foo/*/aaa/*", "/foo/xxx/aaa", "/foo/xxx/aaa/*");
test_path_glob_can_match_one("/foo/*/aaa/*", "/foo/xxx", "/foo/xxx/aaa/*");
test_path_glob_can_match_one("/foo/*/aaa/*", "/foo", "/foo/*/aaa/*");
test_path_glob_can_match_one("/foo/*/aaa/*", "/", "/foo/*/aaa/*");
}
TEST(print_MAX) {
log_info("PATH_MAX=%zu\n"
"FILENAME_MAX=%zu\n"