merge(3p/git): Merge git subtree at v2.29.2 r/1890

This also bumps the stable nixpkgs to 20.09 as of 2020-11-21, because
there is some breakage in the git build related to the netrc
credentials helper which someone has taken care of in nixpkgs.

The stable channel is not used for anything other than git, so this
should be fine.

Change-Id: I3575a19dab09e1e9556cf8231d717de9890484fb

1 files changed, 33 insertions, 28 deletions

diff --git a/third_party/git/name-hash.c b/third_party/git/name-hash.c
index 695908609f40..fb526a3775f6 100644
--- a/third_party/git/name-hash.c
+++ b/third_party/git/name-hash.c
@@ -17,14 +17,16 @@ struct dir_entry {
 };
 
 static int dir_entry_cmp(const void *unused_cmp_data,
-			 const void *entry,
-			 const void *entry_or_key,
+			 const struct hashmap_entry *eptr,
+			 const struct hashmap_entry *entry_or_key,
 			 const void *keydata)
 {
-	const struct dir_entry *e1 = entry;
-	const struct dir_entry *e2 = entry_or_key;
+	const struct dir_entry *e1, *e2;
 	const char *name = keydata;
 
+	e1 = container_of(eptr, const struct dir_entry, ent);
+	e2 = container_of(entry_or_key, const struct dir_entry, ent);
+
 	return e1->namelen != e2->namelen || strncasecmp(e1->name,
 			name ? name : e2->name, e1->namelen);
 }
@@ -33,9 +35,9 @@ static struct dir_entry *find_dir_entry__hash(struct index_state *istate,
 		const char *name, unsigned int namelen, unsigned int hash)
 {
 	struct dir_entry key;
-	hashmap_entry_init(&key, hash);
+	hashmap_entry_init(&key.ent, hash);
 	key.namelen = namelen;
-	return hashmap_get(&istate->dir_hash, &key, name);
+	return hashmap_get_entry(&istate->dir_hash, &key, ent, name);
 }
 
 static struct dir_entry *find_dir_entry(struct index_state *istate,
@@ -68,9 +70,9 @@ static struct dir_entry *hash_dir_entry(struct index_state *istate,
 	if (!dir) {
 		/* not found, create it and add to hash table */
 		FLEX_ALLOC_MEM(dir, name, ce->name, namelen);
-		hashmap_entry_init(dir, memihash(ce->name, namelen));
+		hashmap_entry_init(&dir->ent, memihash(ce->name, namelen));
 		dir->namelen = namelen;
-		hashmap_add(&istate->dir_hash, dir);
+		hashmap_add(&istate->dir_hash, &dir->ent);
 
 		/* recursively add missing parent directories */
 		dir->parent = hash_dir_entry(istate, ce, namelen);
@@ -95,7 +97,7 @@ static void remove_dir_entry(struct index_state *istate, struct cache_entry *ce)
 	struct dir_entry *dir = hash_dir_entry(istate, ce, ce_namelen(ce));
 	while (dir && !(--dir->nr)) {
 		struct dir_entry *parent = dir->parent;
-		hashmap_remove(&istate->dir_hash, dir, NULL);
+		hashmap_remove(&istate->dir_hash, &dir->ent, NULL);
 		free(dir);
 		dir = parent;
 	}
@@ -106,20 +108,23 @@ static void hash_index_entry(struct index_state *istate, struct cache_entry *ce)
 	if (ce->ce_flags & CE_HASHED)
 		return;
 	ce->ce_flags |= CE_HASHED;
-	hashmap_entry_init(ce, memihash(ce->name, ce_namelen(ce)));
-	hashmap_add(&istate->name_hash, ce);
+	hashmap_entry_init(&ce->ent, memihash(ce->name, ce_namelen(ce)));
+	hashmap_add(&istate->name_hash, &ce->ent);
 
 	if (ignore_case)
 		add_dir_entry(istate, ce);
 }
 
 static int cache_entry_cmp(const void *unused_cmp_data,
-			   const void *entry,
-			   const void *entry_or_key,
+			   const struct hashmap_entry *eptr,
+			   const struct hashmap_entry *entry_or_key,
 			   const void *remove)
 {
-	const struct cache_entry *ce1 = entry;
-	const struct cache_entry *ce2 = entry_or_key;
+	const struct cache_entry *ce1, *ce2;
+
+	ce1 = container_of(eptr, const struct cache_entry, ent);
+	ce2 = container_of(entry_or_key, const struct cache_entry, ent);
+
 	/*
 	 * For remove_name_hash, find the exact entry (pointer equality); for
 	 * index_file_exists, find all entries with matching hash code and
@@ -133,7 +138,7 @@ static int lazy_nr_dir_threads;
 
 /*
  * Set a minimum number of cache_entries that we will handle per
- * thread and use that to decide how many threads to run (upto
+ * thread and use that to decide how many threads to run (up to
  * the number on the system).
  *
  * For guidance setting the lower per-thread bound, see:
@@ -213,7 +218,7 @@ static int lookup_lazy_params(struct index_state *istate)
  * However, the hashmap is going to put items into bucket
  * chains based on their hash values.  Use that to create n
  * mutexes and lock on mutex[bucket(hash) % n].  This will
- * decrease the collision rate by (hopefully) by a factor of n.
+ * decrease the collision rate by (hopefully) a factor of n.
  */
 static void init_dir_mutex(void)
 {
@@ -280,10 +285,10 @@ static struct dir_entry *hash_dir_entry_with_parent_and_prefix(
 	dir = find_dir_entry__hash(istate, prefix->buf, prefix->len, hash);
 	if (!dir) {
 		FLEX_ALLOC_MEM(dir, name, prefix->buf, prefix->len);
-		hashmap_entry_init(dir, hash);
+		hashmap_entry_init(&dir->ent, hash);
 		dir->namelen = prefix->len;
 		dir->parent = parent;
-		hashmap_add(&istate->dir_hash, dir);
+		hashmap_add(&istate->dir_hash, &dir->ent);
 
 		if (parent) {
 			unlock_dir_mutex(lock_nr);
@@ -472,8 +477,8 @@ static void *lazy_name_thread_proc(void *_data)
 	for (k = 0; k < d->istate->cache_nr; k++) {
 		struct cache_entry *ce_k = d->istate->cache[k];
 		ce_k->ce_flags |= CE_HASHED;
-		hashmap_entry_init(ce_k, d->lazy_entries[k].hash_name);
-		hashmap_add(&d->istate->name_hash, ce_k);
+		hashmap_entry_init(&ce_k->ent, d->lazy_entries[k].hash_name);
+		hashmap_add(&d->istate->name_hash, &ce_k->ent);
 	}
 
 	return NULL;
@@ -625,7 +630,7 @@ void remove_name_hash(struct index_state *istate, struct cache_entry *ce)
 	if (!istate->name_hash_initialized || !(ce->ce_flags & CE_HASHED))
 		return;
 	ce->ce_flags &= ~CE_HASHED;
-	hashmap_remove(&istate->name_hash, ce, ce);
+	hashmap_remove(&istate->name_hash, &ce->ent, ce);
 
 	if (ignore_case)
 		remove_dir_entry(istate, ce);
@@ -702,15 +707,15 @@ void adjust_dirname_case(struct index_state *istate, char *name)
 struct cache_entry *index_file_exists(struct index_state *istate, const char *name, int namelen, int icase)
 {
 	struct cache_entry *ce;
+	unsigned int hash = memihash(name, namelen);
 
 	lazy_init_name_hash(istate);
 
-	ce = hashmap_get_from_hash(&istate->name_hash,
-				   memihash(name, namelen), NULL);
-	while (ce) {
+	ce = hashmap_get_entry_from_hash(&istate->name_hash, hash, NULL,
+					 struct cache_entry, ent);
+	hashmap_for_each_entry_from(&istate->name_hash, ce, ent) {
 		if (same_name(ce, name, namelen, icase))
 			return ce;
-		ce = hashmap_get_next(&istate->name_hash, ce);
 	}
 	return NULL;
 }
@@ -721,6 +726,6 @@ void free_name_hash(struct index_state *istate)
 		return;
 	istate->name_hash_initialized = 0;
 
-	hashmap_free(&istate->name_hash, 0);
-	hashmap_free(&istate->dir_hash, 1);
+	hashmap_free(&istate->name_hash);
+	hashmap_free_entries(&istate->dir_hash, struct dir_entry, ent);
 }