NEW! Subversion control and test for future Blender binaries.

Next to the release code, a subversion number is written in the file
now. This is in the chunk GLOB, which is now in beginning of file.

Subversions can be used to have finer control over do_versions(), so you
don't have to wait for a release to patch stuff nicely. We can also
increase these subversions regularly to denote important changes.
If a subversion is not 0, it's being printed in the header, so a user can
also verify the state. (We might even tag cvs for it?).

Next to this, a minimum version and subversion number are written too.
From now on, if you change files in a way a past binary cannot read this
nicely anymore, you should set these minima to the current version.
This was especially added for the new mesh layers, which will not work
for older binaries once we make 2.43.

1 files changed, 22 insertions, 2 deletions

diff --git a/source/blender/blenkernel/intern/blender.c b/source/blender/blenkernel/intern/blender.c
index bb5f25c6907..1b4c0bffce7 100644
--- a/source/blender/blenkernel/intern/blender.c
+++ b/source/blender/blenkernel/intern/blender.c
@@ -213,7 +213,10 @@ void initglobals(void)
 	G.order= 1;
 	G.order= (((char*)&G.order)[0])?L_ENDIAN:B_ENDIAN;
 
-	sprintf(versionstr, "www.blender.org %d", G.version);
+	if(BLENDER_SUBVERSION)
+		sprintf(versionstr, "www.blender.org %d.%d", G.version, BLENDER_SUBVERSION);
+	else
+		sprintf(versionstr, "www.blender.org %d", G.version);
 
 #ifdef _WIN32	// FULLSCREEN
 	G.windowstate = G_WINDOWSTATE_USERDEF;
@@ -411,6 +414,20 @@ static void setup_app_data(BlendFileData *bfd, char *filename)
 	MEM_freeN(bfd);
 }
 
+static void handle_subversion_warning(Main *main)
+{
+	if(main->minversionfile > BLENDER_VERSION ||
+	   (main->minversionfile == BLENDER_VERSION && 
+		 main->minsubversionfile > BLENDER_SUBVERSION)) {
+		
+		char str[128];
+		
+		sprintf(str, "File written by newer Blender binary: %d.%d , expect loss of data!", main->minversionfile, main->minsubversionfile);
+		error(str);
+	}
+		
+}
+
 /* returns:
    0: no load file
    1: OK
@@ -433,7 +450,10 @@ int BKE_read_file(char *dir, void *type_r)
 			*((BlenFileType*)type_r)= bfd->type;
 		
 		setup_app_data(bfd, dir);
-	} else {
+		
+		handle_subversion_warning(bfd->main);
+	} 
+	else {
 		error("Loading %s failed: %s", dir, BLO_bre_as_string(bre));
 	}