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git/pull: more reference name validation (thanks falsifian)

// and ^. are also disallowed

--- a/sys/src/cmd/git/util.c

+++ b/sys/src/cmd/git/util.c

@@ -528,7 +528,7 @@

 	char *p;

 	slashed = 0;

-	if(*ref == '/')

+	if(*ref == '/' || *ref == '.')

 		return 0;

 	for(p = ref; *p != 0; p++) {

 		switch(*p){

@@ -539,7 +539,7 @@

 				return 0;

 			break;

 		case '/':

-			if(p[1] == 0 || p[1] == '.')

+			if(p[1] == 0 || p[1] == '.' || p[1] == '/')

 				return 0;

 			slashed = 1;

 			break;

-- 

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