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git/fetch: be more robust

currently, git/fetch prints the refs
to update before it fully fetches the
pack files; this can lead to updates
to the refs before we're 100% certain
that the objects are present.

This change prints the updates after
the packfile has been successfully
indexed.

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

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

@@ -181,7 +181,7 @@

 fetchpack(Conn *c)

 {

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

-	char *packtmp, *idxtmp;

+	char *packtmp, *idxtmp, **ref;

 	Hash h, *have, *want;

 	int nref, refsz, first;

 	int i, n, req, pfd;

@@ -193,6 +193,7 @@

 	first = 1;

 	have = eamalloc(refsz, sizeof(have[0]));

 	want = eamalloc(refsz, sizeof(want[0]));

+	ref = eamalloc(refsz, sizeof(ref[0]));

 	while(1){

 		n = readpkt(c, buf, sizeof(buf));

 		if(n == -1)

@@ -213,19 +214,20 @@

 			continue;

 		if(refsz == nref + 1){

 			refsz *= 2;

-			have = erealloc(have, refsz * sizeof(have[0]));

-			want = erealloc(want, refsz * sizeof(want[0]));

+			have = earealloc(have, refsz, sizeof(have[0]));

+			want = earealloc(want, refsz, sizeof(want[0]));

+			ref = earealloc(ref, refsz, sizeof(ref[0]));

 		}

 		if(hparse(&want[nref], sp[0]) == -1)

 			sysfatal("invalid hash %s", sp[0]);

 		if (resolveremote(&have[nref], sp[1]) == -1)

 			memset(&have[nref], 0, sizeof(have[nref]));

-		print("remote %s %H local %H\n", sp[1], want[nref], have[nref]);

+		ref[nref] = estrdup(sp[1]);

 		nref++;

 	}

 	if(listonly){

 		flushpkt(c);

-		return 0;

+		goto showrefs;

 	}

 	if(writephase(c) == -1)

@@ -295,6 +297,15 @@

 		fail(packtmp, idxtmp, "could not index fetched pack: %r");

 	if(rename(packtmp, idxtmp, h) == -1)

 		fail(packtmp, idxtmp, "could not rename indexed pack: %r");

+

+showrefs:

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

+		print("remote %s %H local %H\n", ref[i], want[i], have[i]);

+		free(ref[i]);

+	}

+	free(ref);

+	free(want);

+	free(have);

 	return 0;

 }