6 files changed, 135 insertions, 2 deletions
diff --git a/include/git2/sys/config.h b/include/git2/sys/config.h
index 0a9005e..75d2075 100644
--- a/include/git2/sys/config.h
+++ b/include/git2/sys/config.h
@@ -125,6 +125,57 @@ GIT_EXTERN(int) git_config_add_backend(
 	const git_repository *repo,
 	int force);
 
+/** Options for in-memory configuration backends. */
+typedef struct {
+	unsigned int version;
+
+	/**
+	 * The type of this backend (eg, "command line"). If this is
+	 * NULL, then this will be "in-memory".
+	 */
+	const char *backend_type;
+
+	/**
+	 * The path to the origin; if this is NULL then it will be
+	 * left unset in the resulting configuration entries.
+	 */
+	const char *origin_path;
+} git_config_backend_memory_options;
+
+#define GIT_CONFIG_BACKEND_MEMORY_OPTIONS_VERSION 1
+#define GIT_CONFIG_BACKEND_MEMORY_OPTIONS_INIT { GIT_CONFIG_BACKEND_MEMORY_OPTIONS_VERSION }
+
+
+/**
+ * Create an in-memory configuration backend from a string in standard
+ * git configuration file format.
+ *
+ * @param out the new backend
+ * @param cfg the configuration that is to be parsed
+ * @param len the length of the string pointed to by `cfg`
+ * @param opts the options to initialize this backend with, or NULL
+ */
+extern int git_config_backend_from_string(
+	git_config_backend **out,
+	const char *cfg,
+	size_t len,
+	git_config_backend_memory_options *opts);
+
+/**
+ * Create an in-memory configuration backend from a list of name/value
+ * pairs.
+ *
+ * @param out the new backend
+ * @param values the configuration values to set (in "key=value" format)
+ * @param len the length of the values array
+ * @param opts the options to initialize this backend with, or NULL
+ */
+extern int git_config_backend_from_values(
+	git_config_backend **out,
+	const char **values,
+	size_t len,
+	git_config_backend_memory_options *opts);
+
 /** @} */
 GIT_END_DECL
 #endif
diff --git a/include/git2/sys/email.h b/include/git2/sys/email.h
index 6f4a286..5029f9a 100644
--- a/include/git2/sys/email.h
+++ b/include/git2/sys/email.h
@@ -7,6 +7,11 @@
 #ifndef INCLUDE_sys_git_email_h__
 #define INCLUDE_sys_git_email_h__
 
+#include "git2/common.h"
+#include "git2/diff.h"
+#include "git2/email.h"
+#include "git2/types.h"
+
 /**
  * @file git2/sys/email.h
  * @brief Advanced git email creation routines
diff --git a/include/git2/sys/errors.h b/include/git2/sys/errors.h
new file mode 100644
index 0000000..3ae1215
--- /dev/null
+++ b/include/git2/sys/errors.h
@@ -0,0 +1,66 @@
+/*
+ * Copyright (C) the libgit2 contributors. All rights reserved.
+ *
+ * This file is part of libgit2, distributed under the GNU GPL v2 with
+ * a Linking Exception. For full terms see the included COPYING file.
+ */
+
+#ifndef INCLUDE_sys_git_errors_h__
+#define INCLUDE_sys_git_errors_h__
+
+#include "git2/common.h"
+
+GIT_BEGIN_DECL
+
+/**
+ * Clear the last library error that occurred for this thread.
+ */
+GIT_EXTERN(void) git_error_clear(void);
+
+/**
+ * Set the error message string for this thread, using `printf`-style
+ * formatting.
+ *
+ * This function is public so that custom ODB backends and the like can
+ * relay an error message through libgit2.  Most regular users of libgit2
+ * will never need to call this function -- actually, calling it in most
+ * circumstances (for example, calling from within a callback function)
+ * will just end up having the value overwritten by libgit2 internals.
+ *
+ * This error message is stored in thread-local storage and only applies
+ * to the particular thread that this libgit2 call is made from.
+ *
+ * @param error_class One of the `git_error_t` enum above describing the
+ *                    general subsystem that is responsible for the error.
+ * @param fmt The `printf`-style format string; subsequent arguments must
+ *            be the arguments for the format string.
+ */
+GIT_EXTERN(void) git_error_set(int error_class, const char *fmt, ...)
+                 GIT_FORMAT_PRINTF(2, 3);
+
+/**
+ * Set the error message string for this thread.  This function is like
+ * `git_error_set` but takes a static string instead of a `printf`-style
+ * format.
+ *
+ * @param error_class One of the `git_error_t` enum above describing the
+ *                    general subsystem that is responsible for the error.
+ * @param string The error message to keep
+ * @return 0 on success or -1 on failure
+ */
+GIT_EXTERN(int) git_error_set_str(int error_class, const char *string);
+
+/**
+ * Set the error message to a special value for memory allocation failure.
+ *
+ * The normal `git_error_set_str()` function attempts to `strdup()` the
+ * string that is passed in.  This is not a good idea when the error in
+ * question is a memory allocation failure.  That circumstance has a
+ * special setter function that sets the error string to a known and
+ * statically allocated internal value.
+ */
+GIT_EXTERN(void) git_error_set_oom(void);
+
+GIT_END_DECL
+
+#endif
diff --git a/include/git2/sys/remote.h b/include/git2/sys/remote.h
index 0eae923..58950e1 100644
--- a/include/git2/sys/remote.h
+++ b/include/git2/sys/remote.h
@@ -20,12 +20,18 @@
 
 GIT_BEGIN_DECL
 
+/**
+ * A remote's capabilities.
+ */
 typedef enum {
 	/** Remote supports fetching an advertised object by ID. */
 	GIT_REMOTE_CAPABILITY_TIP_OID = (1 << 0),
 
 	/** Remote supports fetching an individual reachable object. */
 	GIT_REMOTE_CAPABILITY_REACHABLE_OID = (1 << 1),
+
+	/** Remote supports push options. */
+	GIT_REMOTE_CAPABILITY_PUSH_OPTIONS = (1 << 2),
 } git_remote_capability_t;
 
 /**
diff --git a/include/git2/sys/repository.h b/include/git2/sys/repository.h
index 892be66..080a404 100644
--- a/include/git2/sys/repository.h
+++ b/include/git2/sys/repository.h
@@ -9,6 +9,7 @@
 
 #include "git2/common.h"
 #include "git2/types.h"
+#include "git2/oid.h"
 
 /**
  * @file git2/sys/repository.h
@@ -32,7 +33,11 @@ GIT_BEGIN_DECL
  * @param out The blank repository
  * @return 0 on success, or an error code
  */
+#ifdef GIT_EXPERIMENTAL_SHA256
+GIT_EXTERN(int) git_repository_new(git_repository **out, git_oid_t oid_type);
+#else
 GIT_EXTERN(int) git_repository_new(git_repository **out);
+#endif
 
 /**
  * Reset all the internal state in a repository.
diff --git a/include/git2/sys/stream.h b/include/git2/sys/stream.h
index 3d28d09..3277088 100644
--- a/include/git2/sys/stream.h
+++ b/include/git2/sys/stream.h
@@ -29,8 +29,8 @@ GIT_BEGIN_DECL
 typedef struct git_stream {
 	int version;
 
-	int encrypted : 1,
-	    proxy_support : 1;
+	unsigned int encrypted : 1,
+	             proxy_support : 1;
 
 	/**
 	 * Timeout for read and write operations; can be set to `0` to