builtin/repack.c: emit warning when shared cache is present

Emit a warning message when the `gvfs.sharedCache` option is set that
the `repack` command will not perform repacking on the shared cache.

In the future we can teach `repack` to operate on the shared cache, at
which point we can drop this commit.

Signed-off-by: Matthew John Cheetham <mjcheetham@outlook.com>

Author: mjcheetham

builtin/repack.c

@@ -24,6 +24,7 @@
 #include "pack-bitmap.h"
 #include "refs.h"
 #include "list-objects-filter-options.h"
+#include "gvfs.h"
 
 #define ALL_INTO_ONE 1
 #define LOOSEN_UNREACHABLE 2
@@ -1145,6 +1146,7 @@ int cmd_repack(int argc,
 	struct tempfile *refs_snapshot = NULL;
 	int i, ext, ret;
 	int show_progress;
+	const char *tmp_obj_dir = NULL;
 
 	/* variables to be filled by option parsing */
 	int delete_redundant = 0;
@@ -1273,6 +1275,10 @@ int cmd_repack(int argc,
 		write_bitmaps = 0;
 	}
 
+	if (gvfs_config_is_set(GVFS_ANY_MASK) &&
+	    !git_config_get_value("gvfs.sharedcache", &tmp_obj_dir))
+		warning(_("shared object cache is configured but will not be repacked"));
+
 	if (write_midx && write_bitmaps) {
 		struct strbuf path = STRBUF_INIT;
 

gvfs.h

@@ -30,6 +30,8 @@
 #define GVFS_BLOCK_FILTERS_AND_EOL_CONVERSIONS      (1 << 6)
 #define GVFS_PREFETCH_DURING_FETCH		    (1 << 7)
 
+#define GVFS_ANY_MASK                               0xFFFFFFFF
+
 void gvfs_load_config_value(const char *value);
 int gvfs_config_is_set(int mask);