lightningd: append (as much as we can) version into default name if DEVELOPER=1

This helps for bug reporting, where we may need to diagnose the other
end.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

lightningd/options.c

@@ -608,16 +608,30 @@ void setup_color_and_alias(struct lightningd *ld)
 
 	if (!ld->alias) {
 		u64 adjective, noun;
+		char *name;
 
 		memcpy(&adjective, der+3, sizeof(adjective));
 		memcpy(&noun, der+3+sizeof(adjective), sizeof(noun));
 		noun %= ARRAY_SIZE(codename_noun);
 		adjective %= ARRAY_SIZE(codename_adjective);
+
+		/* Only use 32 characters */
+		name = tal_fmt(ld, "%s%s-",
+			       codename_adjective[adjective],
+			       codename_noun[noun]);
+#if DEVELOPER
+		assert(strlen(name) < 32);
+		int taillen = 32 - strlen(name);
+		if (taillen > strlen(version()))
+			taillen = strlen(version());
+		/* Fit as much of end of version() as possible */
+		tal_append_fmt(&name, "%s",
+			       version() + strlen(version()) - taillen);
+#endif
+		assert(strlen(name) <= 32);
 		ld->alias = tal_arrz(ld, u8, 33);
-		assert(strlen(codename_adjective[adjective])
-		       + strlen(codename_noun[noun]) < 33);
-		strcpy((char*)ld->alias, codename_adjective[adjective]);
-		strcat((char*)ld->alias, codename_noun[noun]);
+		strcpy((char*)ld->alias, name);
+		tal_free(name);
 	}
 }
 

tests/test_lightningd.py

@@ -1763,13 +1763,13 @@ class LightningDTests(BaseLightningDTests):
         # Might not have seen other node-announce yet.
         # TODO(cdecker) Can't check these without DEVELOPER=1, re-enable after we get alias and color into getinfo
         if DEVELOPER:
-            assert n1['alias'] == 'JUNIORBEAM'
+            assert n1['alias'].startswith('JUNIORBEAM')
             assert n1['color'] == '0266e4'
             if 'alias' not in n2:
                 assert 'color' not in n2
                 assert 'addresses' not in n2
             else:
-                assert n2['alias'] == 'SILENTARTIST'
+                assert n2['alias'].startswith('SILENTARTIST')
                 assert n2['color'] == '022d22'
 
         assert [c['active'] for c in l1.rpc.listchannels()['channels']] == [True, True]