Allowed to blank appendable files and installed first back_hacks.h variable ever

Makefile.am

@@ -11,6 +11,7 @@ libburn_libburn_la_LDFLAGS = \
 libburn_libburn_la_SOURCES = \
 	libburn/async.c \
 	libburn/async.h \
+	libburn/back_hacks.h \
 	libburn/crc.c \
 	libburn/crc.h \
 	libburn/debug.c \

libburn/back_hacks.h

@@ -0,0 +1,54 @@
+/**
+
+ This file bundles variables which disable changes in libburn which are
+ not yet completely accepted.
+
+ The use of these variables is *strongly discouraged* unless you have sincere
+ reason and are willing to share your gained knowledge with the libburn
+ developers.
+
+ Do *not silently rely* on these variables with your application. Tell us
+ that you needed one or more of them. They are subject to removal as soon
+ as consense has been found about correctness of the change they revoke.
+
+ Value 0 means that the new behavior is enabled. Any other value enables
+ the described old time behavior.
+
+ If you doubt one of the changes here broke your application, then do
+ *in your application*, *not here* :
+
+ -  #include "libburn/back_hacks.h" like you include "libburn/libburn.h"
+
+ -  Set the libburn_back_hack_* variable of your choice to 1. 
+    In your app. Not here.
+
+ -  Then start and use libburn as usual. Watch out for results.
+
+ -  If you believe to have detected a flaw in our change, come forward
+    and report it to the libburn developers. Thanks in advance. :)
+
+*/
+
+/** Do not define this macro in your application. Only libburn/init.c is
+    entitled to set it.
+*/ 
+#ifdef BURN_BACK_HACKS_INIT
+
+
+/** Corresponds to http://libburn.pykix.org/ticket/42 
+    Reinstates the old ban not to blank appendable CD-RW. We see no reason
+    for this ban yet. It appears unusual. But maybe it patches a bug.
+*/
+int libburn_back_hack_42= 0;
+
+
+#else /* BURN_BACK_HACKS_INIT */
+
+/* Note: no application programmer info beyond this point */
+
+
+extern int libburn_back_hack_42;
+
+#endif /* ! BURN_BACK_HACKS_INIT */
+
+

libburn/drive.c

@@ -18,6 +18,7 @@
 #include "util.h"
 #include "sg.h"
 #include "structure.h"
+#include "back_hacks.h"
 
 static struct burn_drive drive_array[255];
 static int drivetop = -1;
@@ -151,7 +152,10 @@ void burn_disc_erase_sync(struct burn_drive *d, int fast)
 	burn_print(1, "erasing drive %s %s\n", d->idata->vendor,
 		   d->idata->product);
 
-	if (d->status != BURN_DISC_FULL)
+	/* ts A60825 : allow on parole to blank appendable CDs */
+	if ( ! (d->status == BURN_DISC_FULL ||
+		(d->status == BURN_DISC_APPENDABLE &&
+		 ! libburn_back_hack_42) ) )
 		return;
 	d->cancel = 0;
 	d->busy = BURN_DRIVE_ERASING;

libburn/init.c

@@ -10,6 +10,10 @@
 #include "libburn.h"
 #include "drive.h"
 
+/* ts A60825 : The storage location for back_hacks.h variables. */
+#define BURN_BACK_HACKS_INIT 1
+#include "back_hacks.h"
+
 int burn_running = 0;
 
 /* ts A60813 : wether to use O_EXCL and/or O_NONBLOCK in libburn/sg.c */
@@ -26,6 +30,7 @@ int burn_sg_open_o_nonblock = 1;
 	    to unconditional abort of the process  */
 int burn_sg_open_abort_busy = 0;
 
+
 int burn_initialize(void)
 {
 	if (burn_running)