commit 04c53c18246515277f8f093309035e992273819d
from: Stefan Sperling <stsp@stsp.name>
date: Wed Mar 18 16:11:31 2020 UTC

make got-fetch-pack check for NAK from server before the packfile arrives

commit - 3b9fb5855a164a4eddcd66f327336c34f8948869
commit + 04c53c18246515277f8f093309035e992273819d
blob - 312015a9368f1d111fb38a9cab8e8e1efef0949b
blob + 506a18dece417978b0b5c833aa9365cdf7a218a1
--- libexec/got-fetch-pack/got-fetch-pack.c
+++ libexec/got-fetch-pack/got-fetch-pack.c
@@ -584,7 +584,14 @@ fetch_pack(int fd, int packfd, struct got_object_id *p
 	err = readpkt(&n, fd, buf, sizeof(buf));
 	if (err)
 		goto done;
-	buf[n] = 0;
+	/*
+	 * For now, we only support a full clone, in which case the server
+	 * will now send a "NAK" (meaning no common objects were found).
+	 */
+	if (n != 4 || strncmp(buf, "NAK\n", n) != 0) {
+		err = got_error(GOT_ERR_BAD_PACKET);
+		goto done;
+	}
 
 	if (chattygit)
 		fprintf(stderr, "fetching...\n");