fddev: print genesis hash and shred version

src/app/fddev/configure/genesis.c

@@ -114,6 +114,17 @@ estimate_hashes_per_tick( ulong tick_mhz,
   return (ulong)hashes_per_tick;
 }
 
+/* Derive the shred version from a genesis hash */
+
+static ushort
+shred_version_from_genesis_hash( uchar const * genesis_hash ) {
+  uint version = 0;
+  for( ulong j=0; j<32; j+=2 ) {
+    version ^= ( genesis_hash[j  ] << 8 );
+    version ^= ( genesis_hash[j+1]      );
+  }
+  return (ushort)fd_uint_min( version+1, USHORT_MAX );
+}
 
 /* Create a new genesis.bin file contents into the provided blob buffer
    and return the size of the buffer.  Will abort on error if the
@@ -204,7 +215,14 @@ create_genesis( config_t * const config,
   ulong blob_len = fd_genesis_create( blob, blob_sz, options );
   if( FD_UNLIKELY( !blob_sz ) ) FD_LOG_ERR(( "Failed to create genesis blob" ));
 
-  FD_LOG_DEBUG(( "Created genesis blob (sz=%lu)", blob_len ));
+  uchar genesis_hash[ 32 ];
+  fd_sha256_hash( blob, blob_len, genesis_hash );
+
+  char genesis_hash_cstr[ FD_BASE58_ENCODED_32_SZ ];
+  FD_LOG_INFO(( "Created genesis.bin:  genesis_hash=%s sz=%lu",
+                fd_acct_addr_cstr( genesis_hash_cstr, genesis_hash ),
+                blob_len ));
+  FD_LOG_INFO(( "Shred version: %u", shred_version_from_genesis_hash( genesis_hash ) ));
 
   fd_scratch_detach( NULL );