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conf-parse: make config_parse_many() optionally save 'struct stat' for each file

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Fixes #21113.
This commit is contained in:
Yu Watanabe
2021-10-27 19:49:55 +09:00
parent f3f1172cf6
commit 8524db5021
5 changed files with 128 additions and 43 deletions
Download Patch File Download Diff File Expand all files Collapse all files
src/shared/conf-parser.c
+80 -23
View File
@@ -264,21 +264,18 @@ int config_parse(
const void *table,
ConfigParseFlags flags,
void *userdata,
usec_t *latest_mtime) {
struct stat *ret_stat) {
_cleanup_free_ char *section = NULL, *continuation = NULL;
_cleanup_fclose_ FILE *ours = NULL;
unsigned line = 0, section_line = 0;
bool section_ignored = false, bom_seen = false;
struct stat st;
int r, fd;
usec_t mtime;
assert(filename);
assert(lookup);
/* latest_mtime is an input-output parameter: it will be updated if the mtime of the file we're
* looking at is later than the current *latest_mtime value. */
if (!f) {
f = ours = fopen(filename, "re");
if (!f) {
@@ -287,22 +284,28 @@ int config_parse(
if ((flags & CONFIG_PARSE_WARN) || errno == ENOENT)
log_full_errno(errno == ENOENT ? LOG_DEBUG : LOG_ERR, errno,
"Failed to open configuration file '%s': %m", filename);
return errno == ENOENT ? 0 : -errno;
if (errno == ENOENT) {
if (ret_stat)
*ret_stat = (struct stat) {};
return 0;
}
return -errno;
}
}
fd = fileno(f);
if (fd >= 0) { /* stream might not have an fd, let's be careful hence */
struct stat st;
if (fstat(fd, &st) < 0)
return log_full_errno(FLAGS_SET(flags, CONFIG_PARSE_WARN) ? LOG_ERR : LOG_DEBUG, errno,
"Failed to fstat(%s): %m", filename);
(void) stat_warn_permissions(filename, &st);
mtime = timespec_load(&st.st_mtim);
} else
mtime = 0;
st = (struct stat) {};
for (;;) {
_cleanup_free_ char *buf = NULL;
@@ -422,12 +425,43 @@ int config_parse(
}
}
if (latest_mtime)
*latest_mtime = MAX(*latest_mtime, mtime);
if (ret_stat)
*ret_stat = st;
return 1;
}
static int hashmap_put_stats_by_path(Hashmap **stats_by_path, const char *path, const struct stat *st) {
_cleanup_free_ struct stat *st_copy = NULL;
_cleanup_free_ char *path_copy = NULL;
int r;
assert(stats_by_path);
assert(path);
assert(st);
r = hashmap_ensure_allocated(stats_by_path, &path_hash_ops_free_free);
if (r < 0)
return r;
st_copy = newdup(struct stat, st, 1);
if (!st_copy)
return -ENOMEM;
path_copy = strdup(path);
if (!path)
return -ENOMEM;
r = hashmap_put(*stats_by_path, path_copy, st_copy);
if (r < 0)
return r;
assert(r > 0);
TAKE_PTR(path_copy);
TAKE_PTR(st_copy);
return 0;
}
static int config_parse_many_files(
const char* const* conf_files,
char **files,
@@ -436,30 +470,53 @@ static int config_parse_many_files(
const void *table,
ConfigParseFlags flags,
void *userdata,
usec_t *ret_mtime) {
Hashmap **ret_stats_by_path) {
usec_t mtime = 0;
_cleanup_hashmap_free_ Hashmap *stats_by_path = NULL;
struct stat st;
char **fn;
int r;
if (ret_stats_by_path) {
stats_by_path = hashmap_new(&path_hash_ops_free_free);
if (!stats_by_path)
return -ENOMEM;
}
/* First read the first found main config file. */
STRV_FOREACH(fn, (char**) conf_files) {
r = config_parse(NULL, *fn, NULL, sections, lookup, table, flags, userdata, &mtime);
r = config_parse(NULL, *fn, NULL, sections, lookup, table, flags, userdata, &st);
if (r < 0)
return r;
if (r > 0)
break;
if (r == 0)
continue;
if (ret_stats_by_path) {
r = hashmap_put_stats_by_path(&stats_by_path, *fn, &st);
if (r < 0)
return r;
}
break;
}
/* Then read all the drop-ins. */
STRV_FOREACH(fn, files) {
r = config_parse(NULL, *fn, NULL, sections, lookup, table, flags, userdata, &mtime);
r = config_parse(NULL, *fn, NULL, sections, lookup, table, flags, userdata, &st);
if (r < 0)
return r;
if (r == 0)
continue;
if (ret_stats_by_path) {
r = hashmap_put_stats_by_path(&stats_by_path, *fn, &st);
if (r < 0)
return r;
}
}
if (ret_mtime)
*ret_mtime = mtime;
if (ret_stats_by_path)
*ret_stats_by_path = TAKE_PTR(stats_by_path);
return 0;
}
@@ -473,7 +530,7 @@ int config_parse_many_nulstr(
const void *table,
ConfigParseFlags flags,
void *userdata,
usec_t *ret_mtime) {
Hashmap **ret_stats_by_path) {
_cleanup_strv_free_ char **files = NULL;
int r;
@@ -484,7 +541,7 @@ int config_parse_many_nulstr(
return config_parse_many_files(STRV_MAKE_CONST(conf_file),
files, sections, lookup, table, flags, userdata,
ret_mtime);
ret_stats_by_path);
}
/* Parse each config file in the directories specified as strv. */
@@ -497,7 +554,7 @@ int config_parse_many(
const void *table,
ConfigParseFlags flags,
void *userdata,
usec_t *ret_mtime) {
Hashmap **ret_stats_by_path) {
_cleanup_strv_free_ char **dropin_dirs = NULL;
_cleanup_strv_free_ char **files = NULL;
@@ -513,7 +570,7 @@ int config_parse_many(
if (r < 0)
return r;
return config_parse_many_files(conf_files, files, sections, lookup, table, flags, userdata, ret_mtime);
return config_parse_many_files(conf_files, files, sections, lookup, table, flags, userdata, ret_stats_by_path);
}
#define DEFINE_PARSER(type, vartype, conv_func) \
src/shared/conf-parser.h
+5 -3
View File
@@ -6,8 +6,10 @@
#include <stddef.h>
#include <stdio.h>
#include <syslog.h>
#include <sys/stat.h>
#include "alloc-util.h"
#include "hashmap.h"
#include "log.h"
#include "macro.h"
#include "time-util.h"
@@ -89,7 +91,7 @@ int config_parse(
const void *table,
ConfigParseFlags flags,
void *userdata,
usec_t *latest_mtime); /* input/output, possibly NULL */
struct stat *ret_stat); /* possibly NULL */
int config_parse_many_nulstr(
const char *conf_file, /* possibly NULL */
@@ -99,7 +101,7 @@ int config_parse_many_nulstr(
const void *table,
ConfigParseFlags flags,
void *userdata,
usec_t *ret_mtime); /* possibly NULL */
Hashmap **ret_stats_by_path); /* possibly NULL */
int config_parse_many(
const char* const* conf_files, /* possibly empty */
@@ -110,7 +112,7 @@ int config_parse_many(
const void *table,
ConfigParseFlags flags,
void *userdata,
usec_t *ret_mtime); /* possibly NULL */
Hashmap **ret_stats_by_path); /* possibly NULL */
CONFIG_PARSER_PROTOTYPE(config_parse_int);
CONFIG_PARSER_PROTOTYPE(config_parse_unsigned);