gvfs: add the core.gvfs config setting

This does not do anything yet. The next patches will add various values
for that config setting that correspond to the various features
offered/required by GVFS.

Signed-off-by: Kevin Willford <kewillf@microsoft.com>

Author: Kevin Willford

Documentation/config/core.txt

@@ -713,6 +713,9 @@ core.multiPackIndex::
 	single index. See linkgit:git-multi-pack-index[1] for more
 	information. Defaults to true.
 
+core.gvfs::
+	Enable the features needed for GVFS.
+
 core.sparseCheckout::
 	Enable "sparse checkout" feature. See linkgit:git-sparse-checkout[1]
 	for more information.

cache.h

@@ -1076,6 +1076,7 @@ enum fsync_method {
 
 extern enum fsync_method fsync_method;
 extern int core_preload_index;
+extern int core_gvfs;
 extern int precomposed_unicode;
 extern int protect_hfs;
 extern int protect_ntfs;

config.c

@@ -7,6 +7,7 @@
  */
 #include "cache.h"
 #include "date.h"
+#include "gvfs.h"
 #include "branch.h"
 #include "config.h"
 #include "environment.h"
@@ -1717,6 +1718,11 @@ int git_default_core_config(const char *var, const char *value, void *cb)
 		return 0;
 	}
 
+	if (!strcmp(var, "core.gvfs")) {
+		gvfs_load_config_value(value);
+		return 0;
+	}
+
 	if (!strcmp(var, "core.sparsecheckout")) {
 		core_apply_sparse_checkout = git_config_bool(var, value);
 		return 0;

environment.c

@@ -73,6 +73,7 @@ int grafts_replace_parents = 1;
 int core_apply_sparse_checkout;
 int core_sparse_checkout_cone;
 int sparse_expect_files_outside_of_patterns;
+int core_gvfs;
 int merge_log_config = -1;
 int precomposed_unicode = -1; /* see probe_utf8_pathname_composition() */
 unsigned long pack_size_limit_cfg;

gvfs.h

@@ -1,9 +1,40 @@
 #ifndef GVFS_H
 #define GVFS_H
 
+#include "cache.h"
+#include "config.h"
+
 /*
  * This file is for the specific settings and methods
  * used for GVFS functionality
  */
 
+static inline int gvfs_config_is_set(int mask) {
+	return (core_gvfs & mask) == mask;
+}
+
+static inline int gvfs_config_is_set_any(void) {
+	return core_gvfs > 0;
+}
+
+static inline void gvfs_load_config_value(const char *value) {
+	int is_bool = 0;
+
+	if (value)
+		core_gvfs = git_config_bool_or_int("core.gvfs", value, &is_bool);
+	else
+		git_config_get_bool_or_int("core.gvfs", &is_bool, &core_gvfs);
+
+	/* Turn on all bits if a bool was set in the settings */
+	if (is_bool && core_gvfs)
+		core_gvfs = -1;
+}
+
+
+static inline int gvfs_config_load_and_is_set(int mask) {
+	gvfs_load_config_value(0);
+	return gvfs_config_is_set(mask);
+}
+
+
 #endif /* GVFS_H */