[alsa-devel] [PATCH alsa-lib 1/4] ucm: Fix opening of master-configs by the card's longname

[Hans de Goede]

Prior to commit aba2260ae7b5 ("ucm: switch to ucm2 directory and v2 format,
keep backward compatibility").

The filename build in parse_verb_file() was build like this:
<prefix>/<uc_mgr->conf_file_name>/<file>

Where uc_mgr->conf_file_name would contain either the card_name or the
card's longname depending on the detection of a longname based config in
uc_mgr_import_master_config().

While the filename used in load_master_config() was build like this:
<prefix>/<card_name>/<card_name>.conf

And uc_mgr_import_master_config() first calls load_master_config()
with the card's longname and if that succeeds it overwrites
uc_mgr->conf_file_name with the longname so that the subsequent uses
of uc_mgr->conf_file_name in parse_verb_file() correctly use the longname.

But the new configuration_filename() helper added in commit aba2260ae7b5
_always_ builds the filename like this:
<prefix>/<uc_mgr->conf_file_name>/<file><suffix>

This breaks the loading of the master-config by its longname, as when
the longname is tried uc_mgr->conf_file_name still contains the card_name.

This commit fixes this by adding a dir parameter to configuration_filename()
and restoring the old behavior by passing card_name as dir in
load_master_config().

Fixes: aba2260ae7b5 ("ucm: switch to ucm2 directory and v2 format, keep backward compatibility")
Signed-off-by: Hans de Goede <hdegoede at redhat.com>
---
 src/ucm/parser.c | 14 +++++++-------
 1 file changed, 7 insertions(+), 7 deletions(-)

diff --git a/src/ucm/parser.c b/src/ucm/parser.c
index ed790dc0..17aab054 100644
--- a/src/ucm/parser.c
+++ b/src/ucm/parser.c
@@ -76,9 +76,10 @@ static void configuration_filename2(char *fn, size_t fn_len, int format,
 
 static void configuration_filename(snd_use_case_mgr_t *uc_mgr,
 				   char *fn, size_t fn_len,
-				   const char *file, const char *suffix)
+				   const char *dir, const char *file,
+				   const char *suffix)
 {
-	const char *env, *dir;
+	const char *env;
 
 	if (uc_mgr->conf_format > 0) {
 		/* known format */
@@ -94,13 +95,11 @@ static void configuration_filename(snd_use_case_mgr_t *uc_mgr,
 		}
 	}
 	if (env) {
-		snprintf(fn, fn_len, "%s/%s/%s%s",
-			env, uc_mgr->conf_file_name, file, suffix);
+		snprintf(fn, fn_len, "%s/%s/%s%s", env, dir, file, suffix);
 		fn[fn_len-1] = '\0';
 		return;
 	}
 
-	dir = uc_mgr->conf_file_name;
 	if (uc_mgr->conf_format > 0) {
 __format:
 		configuration_filename2(fn, fn_len, uc_mgr->conf_format,
@@ -1181,7 +1180,8 @@ static int parse_verb_file(snd_use_case_mgr_t *uc_mgr,
 	}
 
 	/* open Verb file for reading */
-	configuration_filename(uc_mgr, filename, sizeof(filename), file, "");
+	configuration_filename(uc_mgr, filename, sizeof(filename),
+			       uc_mgr->conf_file_name, file, "");
 	err = uc_mgr_config_load(uc_mgr->conf_format, filename, &cfg);
 	if (err < 0) {
 		uc_error("error: failed to open verb file %s : %d",
@@ -1576,7 +1576,7 @@ static int load_master_config(snd_use_case_mgr_t *uc_mgr,
 	}
 
 	configuration_filename(uc_mgr, filename, sizeof(filename),
-			       card_name, ".conf");
+			       card_name, card_name, ".conf");
 
 	/* if the configuration file does not exist, silently return */
 	if (fcheck && access(filename, R_OK) != 0)
-- 
2.23.0