thodg/libgit2

diff --git a/include/git2/config.h b/include/git2/config.h
index 9ae54f1..78a1f62 100644
--- a/include/git2/config.h
+++ b/include/git2/config.h
@@ -38,6 +38,32 @@
 GIT_BEGIN_DECL
 
 /**
+ * Generic backend that implements the interface to
+ * access a configuration file
+ */
+struct git_config_file {
+	struct git_config *cfg;
+
+	/* Open means open the file/database and parse if necessary */
+	int (*open)(struct git_config_file *);
+	int (*get)(struct git_config_file *, const char *key, const char **value);
+	int (*set)(struct git_config_file *, const char *key, const char *value);
+	int (*foreach)(struct git_config_file *, int (*fn)(const char *, void *), void *data);
+	void (*free)(struct git_config_file *);
+};
+
+/**
+ * Create a configuration file backend for ondisk files
+ *
+ * These are the normal `.gitconfig` files that Core Git
+ * processes.
+ *
+ * @param out the new backend
+ * @path where the config file is located
+ */
+GIT_EXTERN(int) git_config_file__ondisk(struct git_config_file **out, const char *path);
+
+/**
  * Allocate a new configuration
  */
 GIT_EXTERN(int) git_config_new(git_config **out);
@@ -48,7 +74,7 @@ GIT_EXTERN(int) git_config_new(git_config **out);
  * @param cfg_out pointer to the configuration data
  * @param path where to load the confiration from
  */
-GIT_EXTERN(int) git_config_open_bare(git_config **cfg_out, const char *path);
+GIT_EXTERN(int) git_config_open_file(git_config **cfg_out, const char *path);
 
 /**
  * Open the global configuration file at $HOME/.gitconfig
@@ -67,7 +93,7 @@ GIT_EXTERN(int) git_config_open_global(git_config **cfg);
  * @param backend the backend to add
  * @param priority the priority the backend should have
  */
-GIT_EXTERN(int) git_config_add_backend(git_config *cfg, git_config_backend *backend, int priority);
+GIT_EXTERN(int) git_config_add_file(git_config *cfg, git_config_file *file, int priority);
 
 /**
  * Free the configuration and its associated memory
diff --git a/include/git2/config_backend.h b/include/git2/config_backend.h
deleted file mode 100644
index 427cd95..0000000
--- a/include/git2/config_backend.h
+++ /dev/null
@@ -1,57 +0,0 @@
-/*
- * This file is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License, version 2,
- * as published by the Free Software Foundation.
- *
- * In addition to the permissions in the GNU General Public License,
- * the authors give you unlimited permission to link the compiled
- * version of this file into combinations with other programs,
- * and to distribute those combinations without any restriction
- * coming from the use of this file.  (The General Public License
- * restrictions do apply in other respects; for example, they cover
- * modification of the file, and distribution when not linked into
- * a combined executable.)
- *
- * This file is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; see the file COPYING.  If not, write to
- * the Free Software Foundation, 51 Franklin Street, Fifth Floor,
- * Boston, MA 02110-1301, USA.
- */
-
-#ifndef INCLUDE_git_config_backend_h__
-#define INCLUDE_git_config_backend_h__
-
-#include "common.h"
-#include "types.h"
-#include "config.h"
-
-GIT_BEGIN_DECL
-
-struct git_config;
-
-struct git_config_backend {
-	struct git_config *cfg;
-	/* Open means open the file/database and parse if necessary */
-	int (*open)(struct git_config_backend *);
-	int (* get)(struct git_config_backend *, const char *key, const char **value);
-	int (* set)(struct git_config_backend *, const char *key, const char *value);
-	int (*foreach)(struct git_config_backend *, int (*fn)(const char *, void *), void *data);
-	void (*free)(struct git_config_backend *);
-};
-
-/**
- * Create a file-backed configuration backend
- *
- * @param out the new backend
- * @path where the config file is located
- */
-GIT_EXTERN(int) git_config_backend_file(struct git_config_backend **out, const char *path);
-
-GIT_END_DECL
-
-#endif
diff --git a/include/git2/types.h b/include/git2/types.h
index ab7dc52..b569e83 100644
--- a/include/git2/types.h
+++ b/include/git2/types.h
@@ -130,11 +130,11 @@ typedef struct git_treebuilder git_treebuilder;
 /** Memory representation of an index file. */
 typedef struct git_index git_index;
 
-/** Memory representation of a config file */
+/** Memory representation of a set of config files */
 typedef struct git_config git_config;
 
-/** A specific implementation of a config backend */
-typedef struct git_config_backend git_config_backend;
+/** Interface to access a configuration file */
+typedef struct git_config_file git_config_file;
 
 /** Time in a signature */
 typedef struct git_time {
diff --git a/src/config.c b/src/config.c
index 3b6c23b..061eba6 100644
--- a/src/config.c
+++ b/src/config.c
@@ -27,47 +27,48 @@
 #include "fileops.h"
 #include "hashtable.h"
 #include "config.h"
-#include "git2/config_backend.h"
+#include "git2/config.h"
 #include "vector.h"
 
 #include <ctype.h>
 
 typedef struct {
-	git_config_backend *backend;
+	git_config_file *file;
 	int priority;
-} backend_internal;
+} file_internal;
 
-int git_config_open_bare(git_config **out, const char *path)
+int git_config_open_file(git_config **out, const char *path)
 {
-	git_config_backend *backend = NULL;
+	git_config_file *file = NULL;
 	git_config *cfg = NULL;
 	int error = GIT_SUCCESS;
 
 	error = git_config_new(&cfg);
 	if (error < GIT_SUCCESS)
-		goto error;
+		return error;
 
-	error = git_config_backend_file(&backend, path);
-	if (error < GIT_SUCCESS)
-		goto error;
+	error = git_config_file__ondisk(&file, path);
+	if (error < GIT_SUCCESS) {
+		git_config_free(cfg);
+		return error;
+	}
 
-	error = git_config_add_backend(cfg, backend, 1);
-	if (error < GIT_SUCCESS)
-		goto error;
+	error = git_config_add_file(cfg, file, 1);
+	if (error < GIT_SUCCESS) {
+		file->free(file);
+		git_config_free(cfg);
+		return error;
+	}
 
-	error = backend->open(backend);
-	if (error < GIT_SUCCESS)
-		goto error;
+	error = file->open(file);
+	if (error < GIT_SUCCESS) {
+		git_config_free(cfg);
+		return git__rethrow(error, "Failed to open config file");
+	}
 
 	*out = cfg;
 
-	return error;
-
- error:
-	if(backend)
-		backend->free(backend);
-
-	return error;
+	return GIT_SUCCESS;
 }
 
 int git_config_open_global(git_config **out)
@@ -81,30 +82,30 @@ int git_config_open_global(git_config **out)
 
 	git__joinpath(full_path, home, GIT_CONFIG_FILENAME);
 
-	return git_config_open_bare(out, filename);
+	return git_config_open_file(out, full_path);
 }
 
 void git_config_free(git_config *cfg)
 {
 	unsigned int i;
-	git_config_backend *backend;
-	backend_internal *internal;
+	git_config_file *file;
+	file_internal *internal;
 
-	for(i = 0; i < cfg->backends.length; ++i){
-		internal = git_vector_get(&cfg->backends, i);
-		backend = internal->backend;
-		backend->free(backend);
+	for(i = 0; i < cfg->files.length; ++i){
+		internal = git_vector_get(&cfg->files, i);
+		file = internal->file;
+		file->free(file);
 		free(internal);
 	}
 
-	git_vector_free(&cfg->backends);
+	git_vector_free(&cfg->files);
 	free(cfg);
 }
 
 static int config_backend_cmp(const void *a, const void *b)
 {
-	const backend_internal *bk_a = *(const backend_internal **)(a);
-	const backend_internal *bk_b = *(const backend_internal **)(b);
+	const file_internal *bk_a = *(const file_internal **)(a);
+	const file_internal *bk_b = *(const file_internal **)(b);
 
 	return bk_b->priority - bk_a->priority;
 }
@@ -119,7 +120,7 @@ int git_config_new(git_config **out)
 
 	memset(cfg, 0x0, sizeof(git_config));
 
-	if (git_vector_init(&cfg->backends, 3, config_backend_cmp) < 0) {
+	if (git_vector_init(&cfg->files, 3, config_backend_cmp) < 0) {
 		free(cfg);
 		return GIT_ENOMEM;
 	}
@@ -129,26 +130,26 @@ int git_config_new(git_config **out)
 	return GIT_SUCCESS;
 }
 
-int git_config_add_backend(git_config *cfg, git_config_backend *backend, int priority)
+int git_config_add_file(git_config *cfg, git_config_file *file, int priority)
 {
-	backend_internal *internal;
+	file_internal *internal;
 
-	assert(cfg && backend);
+	assert(cfg && file);
 
-	internal = git__malloc(sizeof(backend_internal));
+	internal = git__malloc(sizeof(file_internal));
 	if (internal == NULL)
 		return GIT_ENOMEM;
 
-	internal->backend = backend;
+	internal->file = file;
 	internal->priority = priority;
 
-	if (git_vector_insert(&cfg->backends, internal) < 0) {
+	if (git_vector_insert(&cfg->files, internal) < 0) {
 		free(internal);
 		return GIT_ENOMEM;
 	}
 
-	git_vector_sort(&cfg->backends);
-	internal->backend->cfg = cfg;
+	git_vector_sort(&cfg->files);
+	internal->file->cfg = cfg;
 
 	return GIT_SUCCESS;
 }
@@ -161,13 +162,13 @@ int git_config_foreach(git_config *cfg, int (*fn)(const char *, void *), void *d
 {
 	int ret = GIT_SUCCESS;
 	unsigned int i;
-	backend_internal *internal;
-	git_config_backend *backend;
+	file_internal *internal;
+	git_config_file *file;
 
-	for(i = 0; i < cfg->backends.length && ret == 0; ++i) {
-		internal = git_vector_get(&cfg->backends, i);
-		backend = internal->backend;
-		ret = backend->foreach(backend, fn, data);
+	for(i = 0; i < cfg->files.length && ret == 0; ++i) {
+		internal = git_vector_get(&cfg->files, i);
+		file = internal->file;
+		ret = file->foreach(file, fn, data);
 	}
 
 	return ret;
@@ -221,15 +222,16 @@ int git_config_set_bool(git_config *cfg, const char *name, int value)
 
 int git_config_set_string(git_config *cfg, const char *name, const char *value)
 {
-	backend_internal *internal;
-	git_config_backend *backend;
+	file_internal *internal;
+	git_config_file *file;
 
-	assert(cfg->backends.length > 0);
+	if (cfg->files.length == 0)
+		return git__throw(GIT_EINVALIDARGS, "Cannot set variable value; no files open in the `git_config` instance");
 
-	internal = git_vector_get(&cfg->backends, 0);
-	backend = internal->backend;
+	internal = git_vector_get(&cfg->files, 0);
+	file = internal->file;
 
-	return backend->set(backend, name, value);
+	return file->set(file, name, value);
 }
 
 /***********
@@ -324,14 +326,15 @@ int git_config_get_bool(git_config *cfg, const char *name, int *out)
 
 int git_config_get_string(git_config *cfg, const char *name, const char **out)
 {
-	backend_internal *internal;
-	git_config_backend *backend;
+	file_internal *internal;
+	git_config_file *file;
 
-	assert(cfg->backends.length > 0);
+	if (cfg->files.length == 0)
+		return git__throw(GIT_EINVALIDARGS, "Cannot get variable value; no files open in the `git_config` instance");
 
-	internal = git_vector_get(&cfg->backends, 0);
-	backend = internal->backend;
+	internal = git_vector_get(&cfg->files, 0);
+	file = internal->file;
 
-	return backend->get(backend, name, out);
+	return file->get(file, name, out);
 }
 
diff --git a/src/config.h b/src/config.h
index 104e016..8b52154 100644
--- a/src/config.h
+++ b/src/config.h
@@ -8,7 +8,7 @@
 #define GIT_CONFIG_FILENAME ".gitconfig"
 
 struct git_config {
-	git_vector backends;
+	git_vector files;
 };
 
 #endif
diff --git a/src/config_file.c b/src/config_file.c
index 40829eb..a5addf1 100644
--- a/src/config_file.c
+++ b/src/config_file.c
@@ -26,7 +26,7 @@
 #include "common.h"
 #include "config.h"
 #include "fileops.h"
-#include "git2/config_backend.h"
+#include "git2/config.h"
 #include "git2/types.h"
 
 #include <ctype.h>
@@ -81,10 +81,8 @@ typedef struct {
 		 (iter) && (((tmp) = CVAR_LIST_NEXT(iter) || 1));\
 		 (iter) = (tmp))
 
-
-
 typedef struct {
-	git_config_backend parent;
+	git_config_file parent;
 
 	cvar_t_list var_list;
 
@@ -96,10 +94,10 @@ typedef struct {
 	} reader;
 
 	char *file_path;
-} file_backend;
+} diskfile_backend;
 
-static int config_parse(file_backend *cfg_file);
-static int parse_variable(file_backend *cfg, char **var_name, char **var_value);
+static int config_parse(diskfile_backend *cfg_file);
+static int parse_variable(diskfile_backend *cfg, char **var_name, char **var_value);
 
 static void cvar_free(cvar_t *var)
 {
@@ -243,10 +241,10 @@ static int cvar_normalize_name(cvar_t *var, char **output)
 	return GIT_SUCCESS;
 }
 
-static int config_open(git_config_backend *cfg)
+static int config_open(git_config_file *cfg)
 {
 	int error;
-	file_backend *b = (file_backend *)cfg;
+	diskfile_backend *b = (diskfile_backend *)cfg;
 
 	error = gitfo_read_file(&b->reader.buffer, b->file_path);
 	if(error < GIT_SUCCESS)
@@ -268,9 +266,9 @@ static int config_open(git_config_backend *cfg)
 	return error;
 }
 
-static void backend_free(git_config_backend *_backend)
+static void backend_free(git_config_file *_backend)
 {
-	file_backend *backend = (file_backend *)_backend;
+	diskfile_backend *backend = (diskfile_backend *)_backend;
 
 	if (backend == NULL)
 		return;
@@ -281,14 +279,15 @@ static void backend_free(git_config_backend *_backend)
 	free(backend);
 }
 
-static int file_foreach(git_config_backend *backend, int (*fn)(const char *, void *), void *data)
+static int file_foreach(git_config_file *backend, int (*fn)(const char *, void *), void *data)
 {
 	int ret = GIT_SUCCESS;
 	cvar_t *var;
-	char *normalized;
-	file_backend *b = (file_backend *)backend;
+	diskfile_backend *b = (diskfile_backend *)backend;
 
 	CVAR_LIST_FOREACH(&b->var_list, var) {
+		char *normalized = NULL;
+
 		ret = cvar_normalize_name(var, &normalized);
 		if (ret < GIT_SUCCESS)
 			return ret;
@@ -302,13 +301,13 @@ static int file_foreach(git_config_backend *backend, int (*fn)(const char *, voi
 	return ret;
 }
 
-static int config_set(git_config_backend *cfg, const char *name, const char *value)
+static int config_set(git_config_file *cfg, const char *name, const char *value)
 {
 	cvar_t *var = NULL;
 	cvar_t *existing = NULL;
 	int error = GIT_SUCCESS;
 	const char *last_dot;
-	file_backend *b = (file_backend *)cfg;
+	diskfile_backend *b = (diskfile_backend *)cfg;
 
 	/*
 	 * If it already exists, we just need to update its value.
@@ -370,11 +369,11 @@ static int config_set(git_config_backend *cfg, const char *name, const char *val
 /*
  * Internal function that actually gets the value in string form
  */
-static int config_get(git_config_backend *cfg, const char *name, const char **out)
+static int config_get(git_config_file *cfg, const char *name, const char **out)
 {
 	cvar_t *var;
 	int error = GIT_SUCCESS;
-	file_backend *b = (file_backend *)cfg;
+	diskfile_backend *b = (diskfile_backend *)cfg;
 
 	var = cvar_list_find(&b->var_list, name);
 
@@ -386,15 +385,15 @@ static int config_get(git_config_backend *cfg, const char *name, const char **ou
 	return error;
 }
 
-int git_config_backend_file(git_config_backend **out, const char *path)
+int git_config_file__ondisk(git_config_file **out, const char *path)
 {
-	file_backend *backend;
+	diskfile_backend *backend;
 
-	backend = git__malloc(sizeof(file_backend));
+	backend = git__malloc(sizeof(diskfile_backend));
 	if (backend == NULL)
 		return GIT_ENOMEM;
 
-	memset(backend, 0x0, sizeof(file_backend));
+	memset(backend, 0x0, sizeof(diskfile_backend));
 
 	backend->file_path = git__strdup(path);
 	if (backend->file_path == NULL) {
@@ -408,12 +407,12 @@ int git_config_backend_file(git_config_backend **out, const char *path)
 	backend->parent.foreach = file_foreach;
 	backend->parent.free = backend_free;
 
-	*out = (git_config_backend *)backend;
+	*out = (git_config_file *)backend;
 
 	return GIT_SUCCESS;
 }
 
-static int cfg_getchar_raw(file_backend *cfg)
+static int cfg_getchar_raw(diskfile_backend *cfg)
 {
 	int c;
 
@@ -442,7 +441,7 @@ static int cfg_getchar_raw(file_backend *cfg)
 #define SKIP_WHITESPACE (1 << 1)
 #define SKIP_COMMENTS (1 << 2)
 
-static int cfg_getchar(file_backend *cfg_file, int flags)
+static int cfg_getchar(diskfile_backend *cfg_file, int flags)
 {
 	const int skip_whitespace = (flags & SKIP_WHITESPACE);
 	const int skip_comments = (flags & SKIP_COMMENTS);
@@ -464,7 +463,7 @@ static int cfg_getchar(file_backend *cfg_file, int flags)
 /*
  * Read the next char, but don't move the reading pointer.
  */
-static int cfg_peek(file_backend *cfg, int flags)
+static int cfg_peek(diskfile_backend *cfg, int flags)
 {
 	void *old_read_ptr;
 	int old_lineno, old_eof;
@@ -497,7 +496,7 @@ static int is_linebreak(const char *pos)
 /*
  * Read and consume a line, returning it in newly-allocated memory.
  */
-static char *cfg_readline(file_backend *cfg)
+static char *cfg_readline(diskfile_backend *cfg)
 {
 	char *line = NULL;
 	char *line_src, *line_end;
@@ -557,7 +556,7 @@ static char *cfg_readline(file_backend *cfg)
 /*
  * Consume a line, without storing it anywhere
  */
-void cfg_consume_line(file_backend *cfg)
+void cfg_consume_line(diskfile_backend *cfg)
 {
 	char *line_start, *line_end;
 
@@ -669,7 +668,7 @@ static int parse_section_header_ext(const char *line, const char *base_name, cha
 	return error;
 }
 
-static int parse_section_header(file_backend *cfg, char **section_out)
+static int parse_section_header(diskfile_backend *cfg, char **section_out)
 {
 	char *name, *name_end;
 	int name_length, c, pos;
@@ -736,7 +735,7 @@ error:
 	return error;
 }
 
-static int skip_bom(file_backend *cfg)
+static int skip_bom(diskfile_backend *cfg)
 {
 	static const char *utf8_bom = "\xef\xbb\xbf";
 
@@ -809,7 +808,7 @@ static void strip_comments(char *line)
 	}
 }
 
-static int config_parse(file_backend *cfg_file)
+static int config_parse(diskfile_backend *cfg_file)
 {
 	int error = GIT_SUCCESS, c;
 	char *current_section = NULL;
@@ -888,7 +887,7 @@ static int is_multiline_var(const char *str)
 	return *end == '\\';
 }
 
-static int parse_multiline_variable(file_backend *cfg, const char *first, char **out)
+static int parse_multiline_variable(diskfile_backend *cfg, const char *first, char **out)
 {
 	char *line = NULL, *end;
 	int error = GIT_SUCCESS, len, ret;
@@ -953,7 +952,7 @@ static int parse_multiline_variable(file_backend *cfg, const char *first, char *
 	return error;
 }
 
-static int parse_variable(file_backend *cfg, char **var_name, char **var_value)
+static int parse_variable(diskfile_backend *cfg, char **var_name, char **var_value)
 {
 	char *tmp;
 	int error = GIT_SUCCESS;
diff --git a/tests/t15-config.c b/tests/t15-config.c
index 50d4735..c2e146c 100644
--- a/tests/t15-config.c
+++ b/tests/t15-config.c
@@ -36,7 +36,7 @@ BEGIN_TEST(config0, "read a simple configuration")
 	git_config *cfg;
 	int i;
 
-	must_pass(git_config_open_bare(&cfg, CONFIG_BASE "/config0"));
+	must_pass(git_config_open_file(&cfg, CONFIG_BASE "/config0"));
 	must_pass(git_config_get_int(cfg, "core.repositoryformatversion", &i));
 	must_be_true(i == 0);
 	must_pass(git_config_get_bool(cfg, "core.filemode", &i));
@@ -58,7 +58,7 @@ BEGIN_TEST(config1, "case sensitivity")
 	int i;
 	const char *str;
 
-	must_pass(git_config_open_bare(&cfg, CONFIG_BASE "/config1"));
+	must_pass(git_config_open_file(&cfg, CONFIG_BASE "/config1"));
 
 	must_pass(git_config_get_string(cfg, "this.that.other", &str));
 	must_be_true(!strcmp(str, "true"));
@@ -84,7 +84,7 @@ BEGIN_TEST(config2, "parse a multiline value")
 	git_config *cfg;
 	const char *str;
 
-	must_pass(git_config_open_bare(&cfg, CONFIG_BASE "/config2"));
+	must_pass(git_config_open_file(&cfg, CONFIG_BASE "/config2"));
 
 	must_pass(git_config_get_string(cfg, "this.That.and", &str));
 	must_be_true(!strcmp(str, "one one one two two three three"));
@@ -99,7 +99,7 @@ BEGIN_TEST(config3, "parse a [section.subsection] header")
 	git_config *cfg;
 	const char *str;
 
-	must_pass(git_config_open_bare(&cfg, CONFIG_BASE "/config3"));
+	must_pass(git_config_open_file(&cfg, CONFIG_BASE "/config3"));
 
 	must_pass(git_config_get_string(cfg, "section.subsection.var", &str));
 	must_be_true(!strcmp(str, "hello"));
@@ -117,7 +117,7 @@ BEGIN_TEST(config4, "a variable name on its own is valid")
 const char *str;
 int i;
 
-	must_pass(git_config_open_bare(&cfg, CONFIG_BASE "/config4"));
+	must_pass(git_config_open_file(&cfg, CONFIG_BASE "/config4"));
 
 	must_pass(git_config_get_string(cfg, "some.section.variable", &str));
 	must_be_true(str == NULL);
@@ -133,7 +133,7 @@ BEGIN_TEST(config5, "test number suffixes")
 	git_config *cfg;
 	long int i;
 
-	must_pass(git_config_open_bare(&cfg, CONFIG_BASE "/config5"));
+	must_pass(git_config_open_file(&cfg, CONFIG_BASE "/config5"));
 
 	must_pass(git_config_get_long(cfg, "number.simple", &i));
 	must_be_true(i == 1);