Implement a test for git-fetch-pack/git-upload-pack

This test provides a minimal example of what went wrong with the old
git-fetch-pack (and now works beautifully).

Signed-off-by: Johannes Schindelin <Johannes.Schindelin@gmx.de>
Signed-off-by: Junio C Hamano <junkio@cox.net>

t/t5500-fetch-pack.sh

@@ -0,0 +1,136 @@
+#!/bin/sh
+#
+# Copyright (c) 2005 Johannes Schindelin
+#
+
+test_description='Testing multi_ack pack fetching
+
+'
+. ./test-lib.sh
+
+# Test fetch-pack/upload-pack pair.
+
+# Some convenience functions
+
+function show_count () {
+	commit_count=$(($commit_count+1))
+	printf "      %d\r" $commit_count
+}
+
+function add () {
+	local name=$1
+	local text="$@"
+	local branch=${name:0:1}
+	local parents=""
+
+	shift
+	while test $1; do
+		parents="$parents -p $1"
+		shift
+	done
+
+	echo "$text" > test.txt
+	git-update-index --add test.txt
+	tree=$(git-write-tree)
+	# make sure timestamps are in correct order
+	sec=$(($sec+1))
+	commit=$(echo "$text" | GIT_AUTHOR_DATE=$sec \
+		git-commit-tree $tree $parents 2>>log2.txt)
+	export $name=$commit
+	echo $commit > .git/refs/heads/$branch
+	eval ${branch}TIP=$commit
+}
+
+function count_objects () {
+	ls .git/objects/??/* 2>>log2.txt | wc -l | tr -d " "
+}
+
+function test_expect_object_count () {
+	local message=$1
+	local count=$2
+
+	output="$(count_objects)"
+	test_expect_success \
+		"new object count $message" \
+		"test $count = $output"
+}
+
+function test_repack () {
+	local rep=$1
+
+	test_expect_success "repack && prune-packed in $rep" \
+		'(git-repack && git-prune-packed)2>>log.txt'
+}
+
+function pull_to_client () {
+	local number=$1
+	local heads=$2
+	local count=$3
+	local no_strict_count_check=$4
+
+	cd client
+	test_expect_success "$number pull" \
+		"git-fetch-pack -v .. $heads > log.txt 2>&1"
+	case "$heads" in *A*) echo $ATIP > .git/refs/heads/A;; esac
+	case "$heads" in *B*) echo $BTIP > .git/refs/heads/B;; esac
+	git-symbolic-ref HEAD refs/heads/${heads:0:1}
+	test_expect_success "fsck" 'git-fsck-objects --full > fsck.txt 2>&1'
+	test_expect_object_count "after $number pull" $count
+	pack_count=$(grep Packing log.txt|tr -dc "0-9")
+	test -z "$pack_count" && pack_count=0
+	if [ -z "$no_strict_count_check" ]; then
+		test_expect_success "minimal count" "test $count = $pack_count"
+	else
+		test $count != $pack_count && \
+			echo "WARNING: $pack_count objects transmitted, only $count of which were needed"
+	fi
+	cd ..
+}
+
+# Here begins the actual testing
+
+# A1 - ... - A20 - A21
+#    \
+#      B1  -   B2 - .. - B70
+
+# client pulls A20, B1. Then tracks only B. Then pulls A.
+
+(
+	mkdir client &&
+	cd client &&
+	git-init-db 2>> log2.txt
+)
+
+add A1
+
+prev=1; cur=2; while [ $cur -le 10 ]; do
+	add A$cur $(eval echo \$A$prev)
+	prev=$cur
+	cur=$(($cur+1))
+done
+
+add B1 $A1
+
+echo $ATIP > .git/refs/heads/A
+echo $BTIP > .git/refs/heads/B
+git-symbolic-ref HEAD refs/heads/B
+
+pull_to_client 1st "B A" $((11*3))
+
+(cd client; test_repack client)
+
+add A11 $A10
+
+prev=1; cur=2; while [ $cur -le 65 ]; do
+	add B$cur $(eval echo \$B$prev)
+	prev=$cur
+	cur=$(($cur+1))
+done
+
+pull_to_client 2nd "B" $((64*3))
+
+(cd client; test_repack client)
+
+pull_to_client 3rd "A" $((1*3)) # old fails
+
+test_done