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authorDavid Herrmann <dh.herrmann@gmail.com>2016-09-21 15:16:00 +0200
committerDavid Herrmann <dh.herrmann@gmail.com>2016-09-21 15:18:28 +0200
commit3a04b789c6f17dff2000a3cdbeaaf86baa604524 (patch)
tree43c9a2ffb2b957c9d5550025a7f4d2032f497378
parent698c5a176ead078e7c86c541be714ccb464dae95 (diff)
sd-hwdb: order properties by origin
If we find duplicates in a property-lookup, make sure to order them by their origin. That is, matches defined "later" take precedence over earlier matches. The "later"-order is defined by file-name + line-number combination. That is, if a match is defined below another one in the same hwdb file, it takes precedence, same as if it is defined in a file ordered after another one. Signed-off-by: David Herrmann <dh.herrmann@gmail.com>
-rw-r--r--src/libsystemd/sd-hwdb/sd-hwdb.c43
1 files changed, 28 insertions, 15 deletions
diff --git a/src/libsystemd/sd-hwdb/sd-hwdb.c b/src/libsystemd/sd-hwdb/sd-hwdb.c
index fb9522959f..488e101ea8 100644
--- a/src/libsystemd/sd-hwdb/sd-hwdb.c
+++ b/src/libsystemd/sd-hwdb/sd-hwdb.c
@@ -141,12 +141,13 @@ static const struct trie_node_f *node_lookup_f(sd_hwdb *hwdb, const struct trie_
return NULL;
}
-static int hwdb_add_property(sd_hwdb *hwdb, const char *key, const char *value) {
+static int hwdb_add_property(sd_hwdb *hwdb, const struct trie_value_entry_f *entry) {
+ const char *key;
int r;
assert(hwdb);
- assert(key);
- assert(value);
+
+ key = trie_string(hwdb, entry->key_off);
/*
* Silently ignore all properties which do not start with a
@@ -157,11 +158,25 @@ static int hwdb_add_property(sd_hwdb *hwdb, const char *key, const char *value)
key++;
+ if (le64toh(hwdb->head->value_entry_size) >= sizeof(struct trie_value_entry2_f)) {
+ const struct trie_value_entry2_f *old, *entry2;
+
+ entry2 = (const struct trie_value_entry2_f *)entry;
+ old = ordered_hashmap_get(hwdb->properties, key);
+ if (old) {
+ /* on duplicates, we order by filename and line-number */
+ r = strcmp(trie_string(hwdb, entry2->filename_off), trie_string(hwdb, old->filename_off));
+ if (r < 0 ||
+ (r == 0 && entry2->line_number < old->line_number))
+ return 0;
+ }
+ }
+
r = ordered_hashmap_ensure_allocated(&hwdb->properties, &string_hash_ops);
if (r < 0)
return r;
- r = ordered_hashmap_replace(hwdb->properties, key, (char*)value);
+ r = ordered_hashmap_replace(hwdb->properties, key, (void *)entry);
if (r < 0)
return r;
@@ -193,8 +208,7 @@ static int trie_fnmatch_f(sd_hwdb *hwdb, const struct trie_node_f *node, size_t
if (le64toh(node->values_count) && fnmatch(linebuf_get(buf), search, 0) == 0)
for (i = 0; i < le64toh(node->values_count); i++) {
- err = hwdb_add_property(hwdb, trie_string(hwdb, trie_node_value(hwdb, node, i)->key_off),
- trie_string(hwdb, trie_node_value(hwdb, node, i)->value_off));
+ err = hwdb_add_property(hwdb, trie_node_value(hwdb, node, i));
if (err < 0)
return err;
}
@@ -259,8 +273,7 @@ static int trie_search_f(sd_hwdb *hwdb, const char *search) {
size_t n;
for (n = 0; n < le64toh(node->values_count); n++) {
- err = hwdb_add_property(hwdb, trie_string(hwdb, trie_node_value(hwdb, node, n)->key_off),
- trie_string(hwdb, trie_node_value(hwdb, node, n)->value_off));
+ err = hwdb_add_property(hwdb, trie_node_value(hwdb, node, n));
if (err < 0)
return err;
}
@@ -415,7 +428,7 @@ static int properties_prepare(sd_hwdb *hwdb, const char *modalias) {
}
_public_ int sd_hwdb_get(sd_hwdb *hwdb, const char *modalias, const char *key, const char **_value) {
- const char *value;
+ const struct trie_value_entry_f *entry;
int r;
assert_return(hwdb, -EINVAL);
@@ -427,11 +440,11 @@ _public_ int sd_hwdb_get(sd_hwdb *hwdb, const char *modalias, const char *key, c
if (r < 0)
return r;
- value = ordered_hashmap_get(hwdb->properties, key);
- if (!value)
+ entry = ordered_hashmap_get(hwdb->properties, key);
+ if (!entry)
return -ENOENT;
- *_value = value;
+ *_value = trie_string(hwdb, entry->value_off);
return 0;
}
@@ -454,8 +467,8 @@ _public_ int sd_hwdb_seek(sd_hwdb *hwdb, const char *modalias) {
}
_public_ int sd_hwdb_enumerate(sd_hwdb *hwdb, const char **key, const char **value) {
+ const struct trie_value_entry_f *entry;
const void *k;
- void *v;
assert_return(hwdb, -EINVAL);
assert_return(key, -EINVAL);
@@ -464,12 +477,12 @@ _public_ int sd_hwdb_enumerate(sd_hwdb *hwdb, const char **key, const char **val
if (hwdb->properties_modified)
return -EAGAIN;
- ordered_hashmap_iterate(hwdb->properties, &hwdb->properties_iterator, &v, &k);
+ ordered_hashmap_iterate(hwdb->properties, &hwdb->properties_iterator, (void **)&entry, &k);
if (!k)
return 0;
*key = k;
- *value = v;
+ *value = trie_string(hwdb, entry->value_off);
return 1;
}