commit-graph: stop using the_hash_algo

Stop using `the_hash_algo` as it implicitly relies on `the_repository`.
Instead, we either use the hash algo provided via the context or, if
there is no such hash algo, we use `the_repository` explicitly. Such
uses will be removed in subsequent commits.

Signed-off-by: Patrick Steinhardt <ps@pks.im>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

Author: pks-t

builtin/commit-graph.c

@@ -109,7 +109,8 @@ static int graph_verify(int argc, const char **argv, const char *prefix,
 		opened = OPENED_GRAPH;
 	else if (errno != ENOENT)
 		die_errno(_("Could not open commit-graph '%s'"), graph_name);
-	else if (open_commit_graph_chain(chain_name, &fd, &st))
+	else if (open_commit_graph_chain(chain_name, &fd, &st,
+					 the_repository->hash_algo))
 		opened = OPENED_CHAIN;
 	else if (errno != ENOENT)
 		die_errno(_("could not open commit-graph chain '%s'"), chain_name);

commit-graph.c

@@ -265,7 +265,7 @@ struct commit_graph *load_commit_graph_one_fd_st(struct repository *r,
 
 	graph_size = xsize_t(st->st_size);
 
-	if (graph_size < graph_min_size(the_hash_algo)) {
+	if (graph_size < graph_min_size(r->hash_algo)) {
 		close(fd);
 		error(_("commit-graph file is too small"));
 		return NULL;
@@ -320,7 +320,7 @@ static int graph_read_commit_data(const unsigned char *chunk_start,
 				  size_t chunk_size, void *data)
 {
 	struct commit_graph *g = data;
-	if (chunk_size / graph_data_width(the_hash_algo) != g->num_commits)
+	if (chunk_size / graph_data_width(g->hash_algo) != g->num_commits)
 		return error(_("commit-graph commit data chunk is wrong size"));
 	g->chunk_commit_data = chunk_start;
 	return 0;
@@ -621,7 +621,8 @@ static int add_graph_to_chain(struct commit_graph *g,
 }
 
 int open_commit_graph_chain(const char *chain_file,
-			    int *fd, struct stat *st)
+			    int *fd, struct stat *st,
+			    const struct git_hash_algo *hash_algo)
 {
 	*fd = git_open(chain_file);
 	if (*fd < 0)
@@ -630,7 +631,7 @@ int open_commit_graph_chain(const char *chain_file,
 		close(*fd);
 		return 0;
 	}
-	if (st->st_size < the_hash_algo->hexsz) {
+	if (st->st_size < hash_algo->hexsz) {
 		close(*fd);
 		if (!st->st_size) {
 			/* treat empty files the same as missing */
@@ -654,7 +655,7 @@ struct commit_graph *load_commit_graph_chain_fd_st(struct repository *r,
 	int i = 0, valid = 1, count;
 	FILE *fp = xfdopen(fd, "r");
 
-	count = st->st_size / (the_hash_algo->hexsz + 1);
+	count = st->st_size / (r->hash_algo->hexsz + 1);
 	CALLOC_ARRAY(oids, count);
 
 	odb_prepare_alternates(r->objects);
@@ -716,7 +717,7 @@ static struct commit_graph *load_commit_graph_chain(struct repository *r,
 	int fd;
 	struct commit_graph *g = NULL;
 
-	if (open_commit_graph_chain(chain_file, &fd, &st)) {
+	if (open_commit_graph_chain(chain_file, &fd, &st, r->hash_algo)) {
 		int incomplete;
 		/* ownership of fd is taken over by load function */
 		g = load_commit_graph_chain_fd_st(r, fd, &st, &incomplete);
@@ -908,7 +909,7 @@ static void fill_commit_graph_info(struct commit *item, struct commit_graph *g,
 		die(_("invalid commit position. commit-graph is likely corrupt"));
 
 	lex_index = pos - g->num_commits_in_base;
-	commit_data = g->chunk_commit_data + st_mult(graph_data_width(the_hash_algo), lex_index);
+	commit_data = g->chunk_commit_data + st_mult(graph_data_width(g->hash_algo), lex_index);
 
 	graph_data = commit_graph_data_at(item);
 	graph_data->graph_pos = pos;
@@ -1112,7 +1113,7 @@ static struct tree *load_tree_for_commit(struct repository *r,
 		g = g->base_graph;
 
 	commit_data = g->chunk_commit_data +
-			st_mult(graph_data_width(the_hash_algo),
+			st_mult(graph_data_width(g->hash_algo),
 				graph_pos - g->num_commits_in_base);
 
 	oidread(&oid, commit_data, the_repository->hash_algo);
@@ -1221,7 +1222,7 @@ static int write_graph_chunk_oids(struct hashfile *f,
 	int count;
 	for (count = 0; count < ctx->commits.nr; count++, list++) {
 		display_progress(ctx->progress, ++ctx->progress_cnt);
-		hashwrite(f, (*list)->object.oid.hash, the_hash_algo->rawsz);
+		hashwrite(f, (*list)->object.oid.hash, f->algop->rawsz);
 	}
 
 	return 0;
@@ -1252,7 +1253,7 @@ static int write_graph_chunk_data(struct hashfile *f,
 			die(_("unable to parse commit %s"),
 				oid_to_hex(&(*list)->object.oid));
 		tree = get_commit_tree_oid(*list);
-		hashwrite(f, tree->hash, the_hash_algo->rawsz);
+		hashwrite(f, tree->hash, ctx->r->hash_algo->rawsz);
 
 		parent = (*list)->parents;
 
@@ -2035,7 +2036,7 @@ static int write_graph_chunk_base_1(struct hashfile *f,
 		return 0;
 
 	num = write_graph_chunk_base_1(f, g->base_graph);
-	hashwrite(f, g->oid.hash, the_hash_algo->rawsz);
+	hashwrite(f, g->oid.hash, g->hash_algo->rawsz);
 	return num + 1;
 }
 
@@ -2059,7 +2060,7 @@ static int write_commit_graph_file(struct write_commit_graph_context *ctx)
 	struct hashfile *f;
 	struct tempfile *graph_layer; /* when ctx->split is non-zero */
 	struct lock_file lk = LOCK_INIT;
-	const unsigned hashsz = the_hash_algo->rawsz;
+	const unsigned hashsz = ctx->r->hash_algo->rawsz;
 	struct strbuf progress_title = STRBUF_INIT;
 	struct chunkfile *cf;
 	unsigned char file_hash[GIT_MAX_RAWSZ];
@@ -2147,7 +2148,7 @@ static int write_commit_graph_file(struct write_commit_graph_context *ctx)
 	hashwrite_be32(f, GRAPH_SIGNATURE);
 
 	hashwrite_u8(f, GRAPH_VERSION);
-	hashwrite_u8(f, oid_version(the_hash_algo));
+	hashwrite_u8(f, oid_version(ctx->r->hash_algo));
 	hashwrite_u8(f, get_num_chunks(cf));
 	hashwrite_u8(f, ctx->num_commit_graphs_after - 1);
 

commit-graph.h

@@ -32,7 +32,8 @@ struct string_list;
 char *get_commit_graph_filename(struct odb_source *source);
 char *get_commit_graph_chain_filename(struct odb_source *source);
 int open_commit_graph(const char *graph_file, int *fd, struct stat *st);
-int open_commit_graph_chain(const char *chain_file, int *fd, struct stat *st);
+int open_commit_graph_chain(const char *chain_file, int *fd, struct stat *st,
+			    const struct git_hash_algo *hash_algo);
 
 /*
  * Given a commit struct, try to fill the commit struct info, including: