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ucm: add cfg-save command

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Allow to save whole (or partial) local UCM alsa library configuration
to a file.

Syntax (saves key1.key2 sub-tree):

	Sequence [
		cfg-save "/tmp/my-file.conf:key1.key2"
	]

Signed-off-by: Jaroslav Kysela <perex@perex.cz>
This commit is contained in:
Jaroslav Kysela 2021-05-14 12:20:18 +02:00
parent f821f09727
commit 5e7c507152
4 changed files with 56 additions and 0 deletions
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41
src/ucm/main.c
View file

@ -573,6 +573,42 @@ static int execute_sysw(const char *sysw)
return 0;
}
static int execute_cfgsave(snd_use_case_mgr_t *uc_mgr, const char *filename)
{
snd_config_t *config = uc_mgr->local_config;
char *file, *root;
snd_output_t *out;
int err = 0;
file = strdup(filename);
if (!file)
return -ENOMEM;
root = strchr(file, ':');
if (root) {
*root = '\0';
err = snd_config_search(config, root + 1, &config);
if (err < 0) {
uc_error("Unable to find subtree '%s'", root);
goto _err;
}
}
err = snd_output_stdio_open(&out, file, "w+");
if (err < 0) {
uc_error("unable to open file '%s': %s", file, snd_strerror(err));
goto _err;
}
err = snd_config_save(config, out);
snd_output_close(out);
if (err < 0) {
uc_error("unable to save configuration: %s", snd_strerror(err));
goto _err;
}
_err:
free(file);
return err;
}
static int rewrite_device_value(snd_use_case_mgr_t *uc_mgr, const char *name, char **value)
{
char *sval;
@ -754,6 +790,11 @@ shell_retry:
if (err < 0)
goto __fail;
break;
case SEQUENCE_ELEMENT_TYPE_CFGSAVE:
err = execute_cfgsave(uc_mgr, s->data.cfgsave);
if (err < 0)
goto __fail;
break;
default:
uc_error("unknown sequence command %i", s->type);
break;