config: pass ctx with config files

Pass config_context to config_callbacks when parsing config files. To
provide the .kvi member, refactor out the configset logic that caches
"struct config_source" and "enum config_scope" as a "struct
key_value_info". Make the "enum config_scope" available to the config
file machinery by plumbing an additional arg through
git_config_from_file_with_options().

We do not exercise ctx yet because the remaining current_config_*()
callers may be used with config_with_options(), which may read config
from parameters, but parameters don't pass ctx yet.

Signed-off-by: Glen Choo <chooglen@google.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

1 files changed, 70 insertions, 35 deletions

diff --git a/config.c b/config.c
index 662d406ac1..3171871182 100644
--- a/config.c
+++ b/config.c
@@ -259,7 +259,9 @@ static int handle_path_include(struct config_source *cs, const char *path,
 			    !cs ? "<unknown>" :
 			    cs->name ? cs->name :
 			    "the command line");
-		ret = git_config_from_file(git_config_include, path, inc);
+		ret = git_config_from_file_with_options(git_config_include, path, inc,
+							current_config_scope(),
+							NULL);
 		inc->depth--;
 	}
 cleanup:
@@ -503,7 +505,7 @@ static int git_config_include(const char *var, const char *value,
 	 * Pass along all values, including "include" directives; this makes it
 	 * possible to query information on the includes themselves.
 	 */
-	ret = inc->fn(var, value, NULL, inc->data);
+	ret = inc->fn(var, value, ctx, inc->data);
 	if (ret < 0)
 		return ret;
 
@@ -939,12 +941,15 @@ static char *parse_value(struct config_source *cs)
 	}
 }
 
-static int get_value(struct config_source *cs, config_fn_t fn, void *data,
-		     struct strbuf *name)
+static int get_value(struct config_source *cs, struct key_value_info *kvi,
+		     config_fn_t fn, void *data, struct strbuf *name)
 {
 	int c;
 	char *value;
 	int ret;
+	struct config_context ctx = {
+		.kvi = kvi,
+	};
 
 	/* Get the full name */
 	for (;;) {
@@ -973,7 +978,8 @@ static int get_value(struct config_source *cs, config_fn_t fn, void *data,
 	 * accurate line number in error messages.
 	 */
 	cs->linenr--;
-	ret = fn(name->buf, value, NULL, data);
+	kvi->linenr = cs->linenr;
+	ret = fn(name->buf, value, &ctx, data);
 	if (ret >= 0)
 		cs->linenr++;
 	return ret;
@@ -1072,8 +1078,19 @@ static int do_event(struct config_source *cs, enum config_event_t type,
 	return 0;
 }
 
+static void kvi_from_source(struct config_source *cs,
+			    enum config_scope scope,
+			    struct key_value_info *out)
+{
+	out->filename = strintern(cs->name);
+	out->origin_type = cs->origin_type;
+	out->linenr = cs->linenr;
+	out->scope = scope;
+}
+
 static int git_parse_source(struct config_source *cs, config_fn_t fn,
-			    void *data, const struct config_options *opts)
+			    struct key_value_info *kvi, void *data,
+			    const struct config_options *opts)
 {
 	int comment = 0;
 	size_t baselen = 0;
@@ -1157,7 +1174,7 @@ static int git_parse_source(struct config_source *cs, config_fn_t fn,
 		 */
 		strbuf_setlen(var, baselen);
 		strbuf_addch(var, tolower(c));
-		if (get_value(cs, fn, data, var) < 0)
+		if (get_value(cs, kvi, fn, data, var) < 0)
 			break;
 	}
 
@@ -2010,9 +2027,11 @@ int git_default_config(const char *var, const char *value,
  * this function.
  */
 static int do_config_from(struct config_reader *reader,
-			  struct config_source *top, config_fn_t fn, void *data,
+			  struct config_source *top, config_fn_t fn,
+			  void *data, enum config_scope scope,
 			  const struct config_options *opts)
 {
+	struct key_value_info kvi = KVI_INIT;
 	int ret;
 
 	/* push config-file parsing state stack */
@@ -2022,8 +2041,9 @@ static int do_config_from(struct config_reader *reader,
 	strbuf_init(&top->value, 1024);
 	strbuf_init(&top->var, 1024);
 	config_reader_push_source(reader, top);
+	kvi_from_source(top, scope, &kvi);
 
-	ret = git_parse_source(top, fn, data, opts);
+	ret = git_parse_source(top, fn, &kvi, data, opts);
 
 	/* pop config-file parsing state stack */
 	strbuf_release(&top->value);
@@ -2037,7 +2057,8 @@ static int do_config_from_file(struct config_reader *reader,
 			       config_fn_t fn,
 			       const enum config_origin_type origin_type,
 			       const char *name, const char *path, FILE *f,
-			       void *data, const struct config_options *opts)
+			       void *data, enum config_scope scope,
+			       const struct config_options *opts)
 {
 	struct config_source top = CONFIG_SOURCE_INIT;
 	int ret;
@@ -2052,19 +2073,20 @@ static int do_config_from_file(struct config_reader *reader,
 	top.do_ftell = config_file_ftell;
 
 	flockfile(f);
-	ret = do_config_from(reader, &top, fn, data, opts);
+	ret = do_config_from(reader, &top, fn, data, scope, opts);
 	funlockfile(f);
 	return ret;
 }
 
-static int git_config_from_stdin(config_fn_t fn, void *data)
+static int git_config_from_stdin(config_fn_t fn, void *data,
+				 enum config_scope scope)
 {
 	return do_config_from_file(&the_reader, fn, CONFIG_ORIGIN_STDIN, "",
-				   NULL, stdin, data, NULL);
+				   NULL, stdin, data, scope, NULL);
 }
 
 int git_config_from_file_with_options(config_fn_t fn, const char *filename,
-				      void *data,
+				      void *data, enum config_scope scope,
 				      const struct config_options *opts)
 {
 	int ret = -1;
@@ -2075,7 +2097,8 @@ int git_config_from_file_with_options(config_fn_t fn, const char *filename,
 	f = fopen_or_warn(filename, "r");
 	if (f) {
 		ret = do_config_from_file(&the_reader, fn, CONFIG_ORIGIN_FILE,
-					  filename, filename, f, data, opts);
+					  filename, filename, f, data, scope,
+					  opts);
 		fclose(f);
 	}
 	return ret;
@@ -2083,13 +2106,15 @@ int git_config_from_file_with_options(config_fn_t fn, const char *filename,
 
 int git_config_from_file(config_fn_t fn, const char *filename, void *data)
 {
-	return git_config_from_file_with_options(fn, filename, data, NULL);
+	return git_config_from_file_with_options(fn, filename, data,
+						 CONFIG_SCOPE_UNKNOWN, NULL);
 }
 
 int git_config_from_mem(config_fn_t fn,
 			const enum config_origin_type origin_type,
 			const char *name, const char *buf, size_t len,
-			void *data, const struct config_options *opts)
+			void *data, enum config_scope scope,
+			const struct config_options *opts)
 {
 	struct config_source top = CONFIG_SOURCE_INIT;
 
@@ -2104,14 +2129,15 @@ int git_config_from_mem(config_fn_t fn,
 	top.do_ungetc = config_buf_ungetc;
 	top.do_ftell = config_buf_ftell;
 
-	return do_config_from(&the_reader, &top, fn, data, opts);
+	return do_config_from(&the_reader, &top, fn, data, scope, opts);
 }
 
 int git_config_from_blob_oid(config_fn_t fn,
 			      const char *name,
 			      struct repository *repo,
 			      const struct object_id *oid,
-			      void *data)
+			      void *data,
+			      enum config_scope scope)
 {
 	enum object_type type;
 	char *buf;
@@ -2127,7 +2153,7 @@ int git_config_from_blob_oid(config_fn_t fn,
 	}
 
 	ret = git_config_from_mem(fn, CONFIG_ORIGIN_BLOB, name, buf, size,
-				  data, NULL);
+				  data, scope, NULL);
 	free(buf);
 
 	return ret;
@@ -2136,13 +2162,14 @@ int git_config_from_blob_oid(config_fn_t fn,
 static int git_config_from_blob_ref(config_fn_t fn,
 				    struct repository *repo,
 				    const char *name,
-				    void *data)
+				    void *data,
+				    enum config_scope scope)
 {
 	struct object_id oid;
 
 	if (repo_get_oid(repo, name, &oid) < 0)
 		return error(_("unable to resolve config blob '%s'"), name);
-	return git_config_from_blob_oid(fn, name, repo, &oid, data);
+	return git_config_from_blob_oid(fn, name, repo, &oid, data, scope);
 }
 
 char *git_system_config(void)
@@ -2228,27 +2255,34 @@ static int do_git_config_sequence(struct config_reader *reader,
 	if (git_config_system() && system_config &&
 	    !access_or_die(system_config, R_OK,
 			   opts->system_gently ? ACCESS_EACCES_OK : 0))
-		ret += git_config_from_file(fn, system_config, data);
+		ret += git_config_from_file_with_options(fn, system_config,
+							 data, CONFIG_SCOPE_SYSTEM,
+							 NULL);
 
 	config_reader_set_scope(reader, CONFIG_SCOPE_GLOBAL);
 	git_global_config(&user_config, &xdg_config);
 
 	if (xdg_config && !access_or_die(xdg_config, R_OK, ACCESS_EACCES_OK))
-		ret += git_config_from_file(fn, xdg_config, data);
+		ret += git_config_from_file_with_options(fn, xdg_config, data,
+							 CONFIG_SCOPE_GLOBAL, NULL);
 
 	if (user_config && !access_or_die(user_config, R_OK, ACCESS_EACCES_OK))
-		ret += git_config_from_file(fn, user_config, data);
+		ret += git_config_from_file_with_options(fn, user_config, data,
+							 CONFIG_SCOPE_GLOBAL, NULL);
 
 	config_reader_set_scope(reader, CONFIG_SCOPE_LOCAL);
 	if (!opts->ignore_repo && repo_config &&
 	    !access_or_die(repo_config, R_OK, 0))
-		ret += git_config_from_file(fn, repo_config, data);
+		ret += git_config_from_file_with_options(fn, repo_config, data,
+							 CONFIG_SCOPE_LOCAL, NULL);
 
 	config_reader_set_scope(reader, CONFIG_SCOPE_WORKTREE);
 	if (!opts->ignore_worktree && worktree_config &&
 	    repo && repo->repository_format_worktree_config &&
 	    !access_or_die(worktree_config, R_OK, 0)) {
-		ret += git_config_from_file(fn, worktree_config, data);
+			ret += git_config_from_file_with_options(fn, worktree_config, data,
+								 CONFIG_SCOPE_WORKTREE,
+								 NULL);
 	}
 
 	config_reader_set_scope(reader, CONFIG_SCOPE_COMMAND);
@@ -2292,12 +2326,14 @@ int config_with_options(config_fn_t fn, void *data,
 	 * regular lookup sequence.
 	 */
 	if (config_source && config_source->use_stdin) {
-		ret = git_config_from_stdin(fn, data);
+		ret = git_config_from_stdin(fn, data, config_source->scope);
 	} else if (config_source && config_source->file) {
-		ret = git_config_from_file(fn, config_source->file, data);
+		ret = git_config_from_file_with_options(fn, config_source->file,
+							data, config_source->scope,
+							NULL);
 	} else if (config_source && config_source->blob) {
 		ret = git_config_from_blob_ref(fn, repo, config_source->blob,
-						data);
+					       data, config_source->scope);
 	} else {
 		ret = do_git_config_sequence(&the_reader, opts, repo, fn, data);
 	}
@@ -2440,16 +2476,14 @@ static int configset_add_value(struct config_reader *reader,
 	if (!reader->source)
 		BUG("configset_add_value has no source");
 	if (reader->source->name) {
-		kv_info->filename = strintern(reader->source->name);
-		kv_info->linenr = reader->source->linenr;
-		kv_info->origin_type = reader->source->origin_type;
+		kvi_from_source(reader->source, current_config_scope(), kv_info);
 	} else {
 		/* for values read from `git_config_from_parameters()` */
 		kv_info->filename = NULL;
 		kv_info->linenr = -1;
 		kv_info->origin_type = CONFIG_ORIGIN_CMDLINE;
+		kv_info->scope = reader->parsing_scope;
 	}
-	kv_info->scope = reader->parsing_scope;
 	si->util = kv_info;
 
 	return 0;
@@ -3490,7 +3524,8 @@ int git_config_set_multivar_in_file_gently(const char *config_filename,
 		 */
 		if (git_config_from_file_with_options(store_aux,
 						      config_filename,
-						      &store, &opts)) {
+						      &store, CONFIG_SCOPE_UNKNOWN,
+						      &opts)) {
 			error(_("invalid config file %s"), config_filename);
 			ret = CONFIG_INVALID_FILE;
 			goto out_free;