This commit works towards implementing the following RFE:

bug #68020: RFE: The mighunter should gracefully stop when it encounters an invalid migration-policy or stream-policy function-name

Improved the rather misleading error-message that is logged by the mighunter
when the migrator-policy Python-function does not attach a tape-copy to any
tape-pool.

mediachanger/castorrmc/common/serror.c

@@ -281,6 +281,7 @@ char *sys_sterrlist[ESTMAXERR-ESTBASEOFF+2] =
    "File has no copy on tape and no diskcopies are accessible",
    "File is on an offline tape",
    "Request canceled while queuing",
+   "Tape-copy not found",
    "BAD ERROR NUMBER"
   };
 

mediachanger/castorrmc/h/serrno.h

@@ -287,7 +287,8 @@
 #define ESTNOSEGFOUND   ESTBASEOFF+23   /* File has no copy on tape and no diskcopies are accessible */
 #define ESTTAPEOFFLINE  ESTBASEOFF+24   /* File is on an offline tape */
 #define ESTREQCANCELED  ESTBASEOFF+25   /* Request canceled while queuing */
-#define ESTMAXERR       ESTBASEOFF+25
+#define ESTTCNOTFOUND   ESTBASEOFF+26   /* Tape-copy not found */
+#define ESTMAXERR       ESTBASEOFF+26
 
 /*
  *------------------------------------------------------------------------

mediachanger/castorrmc/h/serrno.man

@@ -599,6 +599,9 @@ The following error values are returned only by the stager package:
 .TP
 .B ESTREQCANCELED
 (1725) Request canceled while queuing
+.TP
+.B ESTTCNOATTACH
+(1726) Tape-copy not found
 
 .SH SYSREQ ERRORS
 The following error value is returned only by the sysreq package: