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git/query: allow arbitrary length queries

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

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

@@ -152,8 +152,8 @@

 void

 main(int argc, char **argv)

 {

-	char query[2048], repo[512];

-	char *p, *e, *s, *objpfx;

+	char *query, repo[512];

+	char *p, *e, *objpfx;

 	int i, j, n, nrel;

 	Hash *h;

@@ -176,15 +176,16 @@

 		sysfatal("chdir: %r");

 	if((objpfx = smprint("%s/.git/fs/object/", repo)) == nil)

 		sysfatal("smprint: %r");

-	s = "";

+	for(i = 0, n = 0; i < argc; i++)

+		n += strlen(argv[i]) + 1;

+	query = emalloc(n+1);

 	p = query;

-	e = query + nelem(query);

-	for(i = 0; i < argc; i++){

-		if((p = seprint(p, e, "%s%s", s, argv[i])) == nil)

-			sysfatal("query too long");

-		s = " ";

-	}

-	if((n = resolverefs(&h, query)) == -1)

+	e = query + n;

+	for(i = 0; i < argc; i++)

+		p = seprint(p, e, "%s ", argv[i]);

+	n = resolverefs(&h, query);

+	free(query);

+	if(n == -1)

 		sysfatal("resolve: %r");

 	if(changes){

 		for(i = 1; i < n; i++)