612baf5a4599ab93d0f430c538e9fb16bc3c8d3d
braney
  Mon Jun 24 13:51:05 2019 -0700
move trackDbCache stuff to its own file.  Remove dependencies on
/dev/shm being the cache location.

diff --git src/hg/inc/trackDb.h src/hg/inc/trackDb.h
index 2564b81..ff5fa85 100644
--- src/hg/inc/trackDb.h
+++ src/hg/inc/trackDb.h
@@ -697,28 +697,31 @@
  * or a  tab-separated or tagStorm file with a foreign key specified by the "meta" tag.
  */
 
 char *trackDbViewSetting(struct trackDb *tdb, char *name);
 /* Return view setting from tdb, but *not* any of it's parents. */
 
 struct trackDb *lmCloneTdb(struct lm *lm, struct trackDb *tdb, struct trackDb *parent, struct hash *superHash);
 /* clone a single tdb structure.  Will clone its children if it has any */
 
 struct trackDb *lmCloneTdbList(struct lm *lm, struct trackDb *list, struct trackDb *parent, struct hash *superHash);
 /* clone a list of tdb structures. */
 
 struct trackDb *lmCloneSuper(struct lm *lm, struct trackDb *tdb, struct hash *superHash);
 /* clone a super track tdb structure. */
 
-void trackDbHubCloneTdbListToSharedMem(char *trackDbUrl, struct trackDb *list, unsigned long size, char *trackDbCacheDir);
+void trackDbHubCloneTdbListToSharedMem(char *trackDbUrl, struct trackDb *list, unsigned long size);
 /* For this hub, Allocate shared memory and clone trackDb list into it. */
 
-void trackDbCloneTdbListToSharedMem(char *db, struct trackDb *list, unsigned long size, char *trackDbCacheDir);
+void trackDbCloneTdbListToSharedMem(char *db, struct trackDb *list, unsigned long size);
 /* For this native db, allocate shared memory and clone trackDb list into it. */
 
-struct trackDb *trackDbCache(char *db, time_t time, char *trackDbCacheDir);
+struct trackDb *trackDbCache(char *db, time_t time);
 /* Check to see if this db has a cached trackDb. */
 
-struct trackDb *trackDbHubCache(char *trackDbUrl, time_t time, char *trackDbCacheDir);
+struct trackDb *trackDbHubCache(char *trackDbUrl, time_t time);
 /* Check to see if this hub has a cached trackDb. */
+
+boolean trackDbCacheOn();
+/* Check to see if we're caching trackDb contents. */
 #endif /* TRACKDB_H */