Adding upstream version 1:2.47.2.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

tmp-objdir.h

@@ -0,0 +1,85 @@
+#ifndef TMP_OBJDIR_H
+#define TMP_OBJDIR_H
+
+/*
+ * This API allows you to create a temporary object directory, advertise it to
+ * sub-processes via GIT_OBJECT_DIRECTORY and GIT_ALTERNATE_OBJECT_DIRECTORIES,
+ * and then either migrate its object into the main object directory, or remove
+ * it. The library handles unexpected signal/exit death by cleaning up the
+ * temporary directory.
+ *
+ * Example:
+ *
+ *	struct child_process child = CHILD_PROCESS_INIT;
+ *	struct tmp_objdir *t = tmp_objdir_create("incoming");
+ *	strvec_push(&child.args, cmd);
+ *	strvec_pushv(&child.env, tmp_objdir_env(t));
+ *	if (!run_command(&child)) && !tmp_objdir_migrate(t))
+ *		printf("success!\n");
+ *	else
+ *		die("failed...tmp_objdir will clean up for us");
+ *
+ */
+
+struct tmp_objdir;
+
+/*
+ * Create a new temporary object directory with the specified prefix;
+ * returns NULL on failure.
+ */
+struct tmp_objdir *tmp_objdir_create(const char *prefix);
+
+/*
+ * Return a list of environment strings, suitable for use with
+ * child_process.env, that can be passed to child programs to make use of the
+ * temporary object directory.
+ */
+const char **tmp_objdir_env(const struct tmp_objdir *);
+
+/*
+ * Finalize a temporary object directory by migrating its objects into the main
+ * object database, removing the temporary directory, and freeing any
+ * associated resources.
+ */
+int tmp_objdir_migrate(struct tmp_objdir *);
+
+/*
+ * Destroy a temporary object directory, discarding any objects it contains.
+ */
+int tmp_objdir_destroy(struct tmp_objdir *);
+
+/*
+ * Remove all objects from the temporary object directory, while leaving it
+ * around so more objects can be added.
+ */
+void tmp_objdir_discard_objects(struct tmp_objdir *);
+
+/*
+ * Add the temporary object directory as an alternate object store in the
+ * current process.
+ */
+void tmp_objdir_add_as_alternate(const struct tmp_objdir *);
+
+/*
+ * Replaces the writable object store in the current process with the temporary
+ * object directory and makes the former main object store an alternate.
+ * If will_destroy is nonzero, the object directory may not be migrated.
+ */
+void tmp_objdir_replace_primary_odb(struct tmp_objdir *, int will_destroy);
+
+/*
+ * If the primary object database was replaced by a temporary object directory,
+ * restore it to its original value while keeping the directory contents around.
+ * Returns NULL if the primary object database was not replaced.
+ */
+struct tmp_objdir *tmp_objdir_unapply_primary_odb(void);
+
+/*
+ * Reapplies the former primary temporary object database, after potentially
+ * changing its relative path.
+ */
+void tmp_objdir_reapply_primary_odb(struct tmp_objdir *, const char *old_cwd,
+		const char *new_cwd);
+
+
+#endif /* TMP_OBJDIR_H */