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database: rescan after metadata_to_use change 

Store a list of supported tag items in the database.  When loading a
database which does not have a matching list, we must rescan in order
to get the missing information.
This commit is contained in:
Max Kellermann 2009-11-04 18:48:22 +01:00
parent a434c35eb4
commit e96dc9a14c
2 changed files with 33 additions and 0 deletions
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1
NEWS
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@ -47,6 +47,7 @@ ver 0.16 (20??/??/??)
- automatically update the database with Linux inotify
- support .mpdignore files in the music directory
- sort songs by album name first, then disc/track number
- rescan after metadata_to_use change
* log unused/unknown block parameters
* removed the deprecated "error_file" option
* save state when stopped

32
src/database.c
View File

@ -24,6 +24,8 @@
#include "path.h"
#include "stats.h"
#include "text_file.h"
#include "tag.h"
#include "tag_internal.h"
#include "config.h"
#include <glib.h>
@ -44,6 +46,7 @@
#define DB_FORMAT_PREFIX "format: "
#define DIRECTORY_MPD_VERSION "mpd_version: "
#define DIRECTORY_FS_CHARSET "fs_charset: "
#define DB_TAG_PREFIX "tag: "
enum {
DB_FORMAT = 1,
@ -241,6 +244,11 @@ db_save(void)
fprintf(fp, DB_FORMAT_PREFIX "%u\n", DB_FORMAT);
fprintf(fp, "%s%s\n", DIRECTORY_MPD_VERSION, VERSION);
fprintf(fp, "%s%s\n", DIRECTORY_FS_CHARSET, path_get_fs_charset());
for (unsigned i = 0; i < TAG_NUM_OF_ITEM_TYPES; ++i)
if (!ignore_tag_items[i])
fprintf(fp, DB_TAG_PREFIX "%s\n", tag_item_names[i]);
fprintf(fp, "%s\n", DIRECTORY_INFO_END);
if (directory_save(fp, music_root) < 0) {
@ -268,6 +276,7 @@ db_load(GError **error)
int format = 0;
bool found_charset = false, found_version = false;
bool success;
bool tags[TAG_NUM_OF_ITEM_TYPES];
assert(database_path != NULL);
assert(music_root != NULL);
@ -290,6 +299,8 @@ db_load(GError **error)
return false;
}
memset(tags, false, sizeof(tags));
while ((line = read_text_line(fp, buffer)) != NULL &&
strcmp(line, DIRECTORY_INFO_END) != 0) {
if (g_str_has_prefix(line, DB_FORMAT_PREFIX)) {
@ -330,6 +341,18 @@ db_load(GError **error)
g_string_free(buffer, true);
return false;
}
} else if (g_str_has_prefix(line, DB_TAG_PREFIX)) {
const char *name = line + sizeof(DB_TAG_PREFIX) - 1;
enum tag_type tag = tag_name_parse(name);
if (tag == TAG_NUM_OF_ITEM_TYPES) {
g_set_error(error, db_quark(), 0,
"Unrecognized tag '%s', "
"discarding database file",
name);
return false;
}
tags[tag] = true;
} else {
fclose(fp);
g_set_error(error, db_quark(), 0,
@ -346,6 +369,15 @@ db_load(GError **error)
return false;
}
for (unsigned i = 0; i < TAG_NUM_OF_ITEM_TYPES; ++i) {
if (!ignore_tag_items[i] && !tags[i]) {
g_set_error(error, db_quark(), 0,
"Tag list mismatch, "
"discarding database file");
return false;
}
}
g_debug("reading DB");
success = directory_load(fp, music_root, buffer, error);