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criu/config: reduce the number of argv traversals

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Instead of pre-parsing command line twice, one time to detect -h/--help and
another time to find config file parameter, check for both in one pass.

Signed-off-by: Mike Rapoport <rppt@linux.vnet.ibm.com>
Signed-off-by: Andrei Vagin <avagin@virtuozzo.com>
This commit is contained in:
Mike Rapoport 2018-05-09 17:17:52 +03:00 committed by Andrei Vagin
parent 81621ce14c
commit 9124dbd7f9
1 changed files with 37 additions and 50 deletions
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83
criu/config.c
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@ -12,44 +12,6 @@
extern char **global_conf;
extern char **user_conf;
#define HELP_PASSED 1
#define DEFAULT_CONFIGS_FORBIDDEN 2
static int passed_help_or_defaults_forbidden(int argc, char *argv[])
{
/*
* Check for --help / -h on commandline before parsing, otherwise
* the help message won't be displayed if there is an error in
* configuration file syntax. Checks are kept in parser in case of
* option being put in the configuration file itself.
*
* Check also whether default configfiles are forbidden to lower
* number of argv iterations, but checks for help have higher priority.
*/
int i, ret = 0;
for (i = 0; i < argc; i++) {
if ((!strcmp(argv[i], "--help")) || (!strcmp(argv[i], "-h")))
return HELP_PASSED;
if (!strcmp(argv[i], "--no-default-config"))
ret = DEFAULT_CONFIGS_FORBIDDEN;
}
return ret;
}
static char * specific_config_passed(char *args[], int argc)
{
int i;
for (i = 0; i < argc; i++) {
if (!strcmp(args[i], "--config")) {
/* getopt takes next string as required argument automatically */
return args[i + 1];
} else if (strstr(args[i], "--config=") != NULL) {
return args[i] + strlen("--config=");
}
}
return NULL;
}
static int count_elements(char **to_count)
{
int count = 0;
@ -160,13 +122,13 @@ static char ** parse_config(char *filepath)
return configuration;
}
static void init_configuration(int argc, char *argv[], int defaults_forbidden)
static void init_configuration(int argc, char *argv[], bool no_default_config,
char *cfg_file)
{
char *specific_conf = specific_config_passed(argv, argc);
char local_filepath[PATH_MAX + 1];
char *home_dir = getenv("HOME");
if ((specific_conf == NULL) && (!defaults_forbidden)) {
if ((cfg_file == NULL) && (!no_default_config)) {
global_conf = parse_config(GLOBAL_CONFIG_DIR DEFAULT_CONFIG_FILENAME);
if (!home_dir) {
pr_info("Unable to get $HOME directory, local configuration file will not be used.");
@ -175,10 +137,10 @@ static void init_configuration(int argc, char *argv[], int defaults_forbidden)
home_dir, USER_CONFIG_DIR, DEFAULT_CONFIG_FILENAME);
user_conf = parse_config(local_filepath);
}
} else if (specific_conf != NULL) {
global_conf = parse_config(specific_conf);
} else if (cfg_file != NULL) {
global_conf = parse_config(cfg_file);
if (global_conf == NULL) {
pr_err("Can't access configuration file %s.\n", specific_conf);
pr_err("Can't access configuration file %s.\n", cfg_file);
exit(1);
}
}
@ -187,15 +149,40 @@ static void init_configuration(int argc, char *argv[], int defaults_forbidden)
int init_config(int argc, char **argv, int *global_cfg_argc, int *user_cfg_argc,
bool *usage_error)
{
int help_or_configs;
bool no_default_config = false;
char *cfg_file = NULL;
int i;
help_or_configs = passed_help_or_defaults_forbidden(argc, argv);
if (help_or_configs == 1) {
/*
* We are runnning before getopt(), so we need to pre-parse
* the command line.
*
* Check for --help / -h on commandline before parsing, otherwise
* the help message won't be displayed if there is an error in
* configuration file syntax. Checks are kept in parser in case of
* option being put in the configuration file itself.
*
* Check also whether default configfiles are forbidden to lower
* number of argv iterations, but checks for help have higher priority.
*/
for (i = 0; i < argc; i++) {
if ((!strcmp(argv[i], "--help")) || (!strcmp(argv[i], "-h"))) {
*usage_error = false;
return 1;
} else if (!strcmp(argv[i], "--no-default-config")) {
no_default_config = true;
} else if (!strcmp(argv[i], "--config")) {
/*
* getopt takes next string as required
* argument automatically, we do the same
*/
cfg_file = argv[i + 1];
} else if (strstr(argv[i], "--config=") != NULL) {
cfg_file = argv[i] + strlen("--config=");
}
}
init_configuration(argc, argv, (help_or_configs == DEFAULT_CONFIGS_FORBIDDEN));
init_configuration(argc, argv, no_default_config, cfg_file);
if (global_conf != NULL)
*global_cfg_argc = count_elements(global_conf);
if (user_conf != NULL)