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git/get: allow side band messages before ACK.

Sourcehut has been observed sending status messages before the final ack
has been seen; we should show the messages and proceed. I think this is
technically a bug in sr.ht

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

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

@@ -401,8 +401,14 @@

 				sysfatal("read: %r");

 			if(strncmp(buf, "NAK\n", 4) == 0)

 				break;

-			if(strncmp(buf, "ACK ", 4) != 0)

-				sysfatal("bad response: '%s'", buf);

+			if(strncmp(buf, "ACK ", 4) == 0)

+				break;

+			if(c->sideband && buf[0] == 0 || buf[0] == 1 || buf[0] == 2){

+				if(buf[0] == 2)

+					fprint(2, "%s", buf);

+				continue;

+			}

+			sysfatal("bad response: '%s'", buf);

 		}

 	} 

 	if(readpkt(c, buf, sizeof(buf)) == -1)

-- 

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