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>

gvfs: refactor loading the core.gvfs config value

This code change makes sure that the config value for core_gvfs
is always loaded before checking it.

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

Author: Kevin Willford

Diff for: Documentation/config/core.txt

@@ -743,6 +743,9 @@ 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.

Diff for: Makefile

@@ -1038,6 +1038,7 @@ LIB_OBJS += git-zlib.o
 LIB_OBJS += gpg-interface.o
 LIB_OBJS += graph.o
 LIB_OBJS += grep.o
+LIB_OBJS += gvfs.o
 LIB_OBJS += hash-lookup.o
 LIB_OBJS += hashmap.o
 LIB_OBJS += help.o

Diff for: config.c

@@ -13,6 +13,7 @@
 #include "abspath.h"
 #include "advice.h"
 #include "date.h"
+#include "gvfs.h"
 #include "branch.h"
 #include "config.h"
 #include "parse.h"
@@ -1621,6 +1622,11 @@ int git_default_core_config(const char *var, const char *value,
 		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;

Diff for: environment.c

@@ -68,6 +68,7 @@ int grafts_keep_true_parents;
 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;

Diff for: environment.h

@@ -170,6 +170,7 @@ extern unsigned long pack_size_limit_cfg;
 extern int max_allowed_tree_depth;
 
 extern int core_preload_index;
+extern int core_gvfs;
 extern int precomposed_unicode;
 extern int protect_hfs;
 extern int protect_ntfs;

Diff for: gvfs.c

@@ -0,0 +1,45 @@
+#define USE_THE_REPOSITORY_VARIABLE
+#include "git-compat-util.h"
+#include "environment.h"
+#include "gvfs.h"
+#include "setup.h"
+#include "config.h"
+
+static int gvfs_config_loaded;
+static int core_gvfs_is_bool;
+
+static int early_core_gvfs_config(const char *var, const char *value,
+				  const struct config_context *ctx, void *cb UNUSED)
+{
+	if (!strcmp(var, "core.gvfs"))
+		core_gvfs = git_config_bool_or_int("core.gvfs", value, ctx->kvi,
+						   &core_gvfs_is_bool);
+	return 0;
+}
+
+void gvfs_load_config_value(const char *value)
+{
+	if (gvfs_config_loaded)
+		return;
+
+	if (value) {
+		struct key_value_info default_kvi = KVI_INIT;
+		core_gvfs = git_config_bool_or_int("core.gvfs", value, &default_kvi, &core_gvfs_is_bool);
+	} else if (startup_info->have_repository == 0)
+		read_early_config(the_repository, early_core_gvfs_config, NULL);
+	else
+		repo_config_get_bool_or_int(the_repository, "core.gvfs",
+					    &core_gvfs_is_bool, &core_gvfs);
+
+	/* Turn on all bits if a bool was set in the settings */
+	if (core_gvfs_is_bool && core_gvfs)
+		core_gvfs = -1;
+
+	gvfs_config_loaded = 1;
+}
+
+int gvfs_config_is_set(int mask)
+{
+	gvfs_load_config_value(NULL);
+	return (core_gvfs & mask) == mask;
+}

Diff for: gvfs.h

@@ -1,9 +1,13 @@
 #ifndef GVFS_H
 #define GVFS_H
 
+
 /*
  * This file is for the specific settings and methods
  * used for GVFS functionality
  */
 
+void gvfs_load_config_value(const char *value);
+int gvfs_config_is_set(int mask);
+
 #endif /* GVFS_H */

Diff for: meson.build

@@ -294,6 +294,7 @@ libgit_sources = [
   'gpg-interface.c',
   'graph.c',
   'grep.c',
+  'gvfs.c',
   'hash-lookup.c',
   'hashmap.c',
   'help.c',