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git/send: fix force pushes

When sending a force push, the remote expects a
pack file, even if it's empty. Generate and send
an empty pack when we do a force push, instead
of flushing and bailing out early.

--- a/pack.c

+++ b/pack.c

@@ -1636,8 +1636,6 @@

 	if((nmeta = readmeta(theirs, ntheirs, ours, nours, &meta)) == -1)

 		return -1;

-	if(nmeta == 0)

-		return 0;

 	pickdeltas(meta, nmeta);

 	r = genpack(fd, meta, nmeta, h, 0);

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

--- a/send.c

+++ b/send.c

@@ -99,7 +99,7 @@

 int

 sendpack(Conn *c)

 {

-	int i, n, r, idx, nupd, nsp, send, first;

+	int i, n, idx, nupd, nsp, send, first;

 	char buf[Pktmax], *sp[3];

 	Hash h, *theirs, *ours;

 	Object *a, *b, *p;

@@ -131,8 +131,9 @@

 	if(writephase(c) == -1)

 		return -1;

-	r = 0;

 	send = 0;

+	if(force)

+		send=1;

 	for(i = 0; i < nupd; i++){

 		a = readobject(theirs[i]);

 		b = readobject(ours[i]);

@@ -142,9 +143,8 @@

 		if(!force && !hasheq(&theirs[i], &Zhash) && (a == nil || p != a)){

 			fprint(2, "remote has diverged\n");

 			werrstr("force needed");

-			send=0;

-			r = -1;

-			break;

+			flushpkt(c);

+			return -1;

 		}

 		unref(a);

 		unref(b);

@@ -184,37 +184,41 @@

 			send = 1;

 	}

 	flushpkt(c);

-	if(!send)

-		print("nothing to send\n");

-	if(send){

-		if(writepack(c->wfd, ours, nupd, theirs, nupd, &h) == -1)

-			return -1;

-		if(cs.report && readphase(c) == -1)

-			return -1;

-		/* We asked for a status report, may as well use it. */

-		while(cs.report && (n = readpkt(c, buf, sizeof(buf))) > 0){

- 			buf[n] = 0;

-			if(chattygit)

-				fprint(2, "done sending pack, status %s\n", buf);

-			nsp = getfields(buf, sp, nelem(sp), 1, " \t\n\r");

-			if(nsp < 2) 

-				continue;

-			if(nsp < 3)

-				sp[2] = "";

-			/*

-			 * Only report errors; successes will be reported by

-			 * surrounding scripts.

-			 */

-			if(strcmp(sp[0], "unpack") == 0 && strcmp(sp[1], "ok") != 0)

-				fprint(2, "unpack %s\n", sp[1]);

-			else if(strcmp(sp[0], "ng") == 0)

-				fprint(2, "failed update: %s\n", sp[1]);

-			else

-				continue;

-			r = -1;

-		}

+	if(!send){

+		fprint(2, "nothing to send\n");

+		return 0;

 	}

-	return r;

+

+	if(writepack(c->wfd, ours, nupd, theirs, nupd, &h) == -1)

+		return -1;

+	if(!cs.report)

+		return 0;

+

+	if(readphase(c) == -1)

+		return -1;

+	/* We asked for a status report, may as well use it. */

+	while((n = readpkt(c, buf, sizeof(buf))) > 0){

+ 		buf[n] = 0;

+		if(chattygit)

+			fprint(2, "done sending pack, status %s\n", buf);

+		nsp = getfields(buf, sp, nelem(sp), 1, " \t\n\r");

+		if(nsp < 2) 

+			continue;

+		if(nsp < 3)

+			sp[2] = "";

+		/*

+		 * Only report errors; successes will be reported by

+		 * surrounding scripts.

+		 */

+		if(strcmp(sp[0], "unpack") == 0 && strcmp(sp[1], "ok") != 0)

+			fprint(2, "unpack %s\n", sp[1]);

+		else if(strcmp(sp[0], "ng") == 0)

+			fprint(2, "failed update: %s\n", sp[1]);

+		else

+			continue;

+		return -1;

+	}

+	return 0;

 }

 void