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udev: use conf_files_list() to search rules files

This commit is contained in:
Kay Sievers 2012-05-07 13:21:05 +02:00
parent 0a1a17aa2d
commit 775f8b3c74
2 changed files with 51 additions and 89 deletions
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139
src/udev/udev-rules.c
View File

@ -36,13 +36,6 @@
#define PREALLOC_STRBUF 32 * 1024
#define PREALLOC_TRIE 256
/* configuration directories with last modification timestamp */
static const char *rules_dirs[] = {
TEST_PREFIX UDEVLIBEXECDIR "/rules.d",
TEST_PREFIX "/run/udev/rules.d",
TEST_PREFIX SYSCONFDIR "/udev/rules.d",
};
struct uid_gid {
unsigned int name_off;
union {
@ -65,7 +58,8 @@ struct trie_node {
struct udev_rules {
struct udev *udev;
unsigned long long dirs_ts_usec[ELEMENTSOF(rules_dirs)];
char **dirs;
unsigned long long *dirs_ts_usec;
int resolve_names;
/* every key in the rules file becomes a token */
@ -79,7 +73,7 @@ struct udev_rules {
size_t buf_max;
unsigned int buf_count;
/* during rule parsing, strings are indexed to find duplicates */
/* during rule parsing, strings are indexed and de-duplicated */
struct trie_node *trie_nodes;
unsigned int trie_nodes_cur;
unsigned int trie_nodes_max;
@ -1188,7 +1182,9 @@ static int add_rule(struct udev_rules *rules, char *line,
memset(&rule_tmp, 0x00, sizeof(struct rule_tmp));
rule_tmp.rules = rules;
rule_tmp.rule.type = TK_RULE;
rule_tmp.rule.rule.filename_off = filename_off;
/* the offset in the rule is limited to unsigned short */
if (filename_off < USHRT_MAX)
rule_tmp.rule.rule.filename_off = filename_off;
rule_tmp.rule.rule.filename_line = lineno;
linepos = line;
@ -1632,21 +1628,27 @@ invalid:
return -1;
}
static int parse_file(struct udev_rules *rules, const char *filename, unsigned short filename_off)
static int parse_file(struct udev_rules *rules, const char *filename)
{
FILE *f;
unsigned int first_token;
unsigned int filename_off;
char line[UTIL_LINE_SIZE];
int line_nr = 0;
unsigned int i;
log_debug("reading '%s' as rules file\n", filename);
if (null_or_empty_path(filename)) {
log_debug("skip empty file: %s\n", filename);
return 0;
}
log_debug("read rules file: %s\n", filename);
f = fopen(filename, "r");
if (f == NULL)
return -1;
first_token = rules->token_cur;
filename_off = add_string(rules, filename);
while (fgets(line, sizeof(line), f) != NULL) {
char *key;
@ -1707,52 +1709,13 @@ static int parse_file(struct udev_rules *rules, const char *filename, unsigned s
return 0;
}
static int add_matching_files(struct udev *udev, struct udev_list *file_list, const char *dirname, const char *suffix)
{
DIR *dir;
struct dirent *dent;
char filename[UTIL_PATH_SIZE];
dir = opendir(dirname);
if (dir == NULL) {
log_debug("unable to open '%s': %m\n", dirname);
return -1;
}
for (dent = readdir(dir); dent != NULL; dent = readdir(dir)) {
if (dent->d_name[0] == '.')
continue;
/* look for file matching with specified suffix */
if (suffix != NULL) {
const char *ext;
ext = strrchr(dent->d_name, '.');
if (ext == NULL)
continue;
if (!streq(ext, suffix))
continue;
}
util_strscpyl(filename, sizeof(filename), dirname, "/", dent->d_name, NULL);
/*
* the basename is the key, the filename the value
* identical basenames from different directories override each other
* entries are sorted after basename
*/
udev_list_entry_add(file_list, dent->d_name, filename);
}
closedir(dir);
return 0;
}
struct udev_rules *udev_rules_new(struct udev *udev, int resolve_names)
{
struct udev_rules *rules;
struct udev_list file_list;
struct udev_list_entry *file_loop;
struct token end_token;
unsigned int i;
char **files, **f;
int r;
rules = calloc(1, sizeof(struct udev_rules));
if (rules == NULL)
@ -1792,41 +1755,37 @@ struct udev_rules *udev_rules_new(struct udev *udev, int resolve_names)
memset(rules->trie_nodes, 0x00, sizeof(struct trie_node));
rules->trie_nodes_cur = 1;
for (i = 0; i < ELEMENTSOF(rules_dirs); i++)
add_matching_files(udev, &file_list, rules_dirs[i], ".rules");
/* add all filenames to the string buffer */
udev_list_entry_foreach(file_loop, udev_list_get_entry(&file_list)) {
const char *filename = udev_list_entry_get_value(file_loop);
unsigned int filename_off;
filename_off = add_string(rules, filename);
/* the offset in the rule is limited to unsigned short */
if (filename_off < USHRT_MAX)
udev_list_entry_set_num(file_loop, filename_off);
rules->dirs = strv_new(TEST_PREFIX SYSCONFDIR "/udev/rules.d",
TEST_PREFIX "/run/udev/rules.d",
TEST_PREFIX UDEVLIBEXECDIR "/rules.d",
NULL);
if (!rules->dirs) {
log_error("failed to build config directory array");
return NULL;
}
/* parse all rules files */
udev_list_entry_foreach(file_loop, udev_list_get_entry(&file_list)) {
const char *filename = udev_list_entry_get_value(file_loop);
unsigned int filename_off = udev_list_entry_get_num(file_loop);
struct stat st;
if (stat(filename, &st) != 0) {
log_error("can not find '%s': %m\n", filename);
continue;
}
if (S_ISREG(st.st_mode) && st.st_size <= 0) {
log_debug("ignore empty '%s'\n", filename);
continue;
}
if (S_ISCHR(st.st_mode)) {
log_debug("ignore masked '%s'\n", filename);
continue;
}
parse_file(rules, filename, filename_off);
if (!strv_path_canonicalize(rules->dirs)) {
log_error("failed to canonicalize config directories\n");
return NULL;
}
udev_list_cleanup(&file_list);
strv_uniq(rules->dirs);
r = conf_files_list_strv(&files, ".rules", (const char **)rules->dirs);
if (r < 0) {
log_error("failed to enumerate rules files: %s\n", strerror(-r));
return NULL;
}
rules->dirs_ts_usec = calloc(strv_length(rules->dirs), sizeof(long long));
/*
* The offset value in the rules strct is limited; add all
* rules file names to the beginning of the string buffer.
*/
STRV_FOREACH(f, files)
add_string(rules, *f);
STRV_FOREACH(f, files)
parse_file(rules, *f);
strv_free(files);
memset(&end_token, 0x00, sizeof(struct token));
end_token.type = TK_END;
@ -1886,6 +1845,8 @@ struct udev_rules *udev_rules_unref(struct udev_rules *rules)
free(rules->trie_nodes);
free(rules->uids);
free(rules->gids);
strv_free(rules->dirs);
free(rules->dirs_ts_usec);
free(rules);
return NULL;
}
@ -1895,10 +1856,10 @@ bool udev_rules_check_timestamp(struct udev_rules *rules)
unsigned int i;
bool changed = false;
for (i = 0; i < ELEMENTSOF(rules_dirs); i++) {
for (i = 0; rules->dirs[i]; i++) {
struct stat stats;
if (stat(rules_dirs[i], &stats) < 0)
if (stat(rules->dirs[i], &stats) < 0)
continue;
if (rules->dirs_ts_usec[i] == ts_usec(&stats.st_mtim))
@ -1906,7 +1867,7 @@ bool udev_rules_check_timestamp(struct udev_rules *rules)
/* first check */
if (rules->dirs_ts_usec[i] != 0) {
log_debug("reload - timestamp of '%s' changed\n", rules_dirs[i]);
log_debug("reload - timestamp of '%s' changed\n", rules->dirs[i]);
changed = true;
}

1
src/udev/udev.h
View File

@ -27,6 +27,7 @@
#include "libudev-private.h"
#include "util.h"
#include "label.h"
#include "strv.h"
struct udev_event {
struct udev *udev;