[PATCH 01/24] t/lib-pack: support SHA-256

["brian m. carlson" <sandals@crustytoothpaste.net>]

Update the support routines for generating packs to support both SHA-1
and SHA-256.  Compute the trailing pack checksum and its length
correctly depending on the algorithm, and look up the object names based
on the algorithm as well.  Ensure we initialize the algorithm facts so
that our callers need not do so.

Signed-off-by: brian m. carlson <sandals@crustytoothpaste.net>
---
 t/lib-pack.sh | 35 ++++++++++++++++++++++++++++++-----
 1 file changed, 30 insertions(+), 5 deletions(-)

diff --git a/t/lib-pack.sh b/t/lib-pack.sh
index c4d907a450..f3463170b3 100644
--- a/t/lib-pack.sh
+++ b/t/lib-pack.sh
@@ -35,9 +35,11 @@ pack_header () {
 # have hardcoded some well-known objects. See the case statements below for the
 # complete list.
 pack_obj () {
+	test_oid_init
+
 	case "$1" in
 	# empty blob
-	e69de29bb2d1d6434b8b29ae775ad8c2e48c5391)
+	$EMPTY_BLOB)
 		case "$2" in
 		'')
 			printf '\060\170\234\003\0\0\0\0\1'
@@ -47,7 +49,7 @@ pack_obj () {
 		;;
 
 	# blob containing "\7\76"
-	e68fe8129b546b101aee9510c5328e7f21ca1d18)
+	$(test_oid packlib_7_76))
 		case "$2" in
 		'')
 			printf '\062\170\234\143\267\3\0\0\116\0\106'
@@ -59,11 +61,18 @@ pack_obj () {
 			printf '\234\143\142\142\142\267\003\0\0\151\0\114'
 			return
 			;;
+		37c8e2c15bb22b912e59b43fd51a4f7e9465ed0b5084c5a1411d991cbe630683)
+			printf '\165\67\310\342\301\133\262\53\221\56\131' &&
+			printf '\264\77\325\32\117\176\224\145\355\13\120' &&
+			printf '\204\305\241\101\35\231\34\276\143\6\203\170' &&
+			printf '\234\143\142\142\142\267\003\0\0\151\0\114'
+			return
+			;;
 		esac
 		;;
 
 	# blob containing "\7\0"
-	01d7713666f4de822776c7622c10f1b07de280dc)
+	$(test_oid packlib_7_0))
 		case "$2" in
 		'')
 			printf '\062\170\234\143\147\0\0\0\20\0\10'
@@ -75,6 +84,13 @@ pack_obj () {
 			printf '\143\142\142\142\147\0\0\0\53\0\16'
 			return
 			;;
+		5d8e6fc40f2dab00e6983a48523fe57e621f46434cb58dbd4422fba03380d886)
+			printf '\165\135\216\157\304\17\55\253\0\346\230\72' &&
+			printf '\110\122\77\345\176\142\37\106\103\114\265' &&
+			printf '\215\275\104\42\373\240\63\200\330\206\170\234' &&
+			printf '\143\142\142\142\147\0\0\0\53\0\16'
+			return
+			;;
 		esac
 		;;
 	esac
@@ -86,7 +102,7 @@ pack_obj () {
 	then
 		echo "$1" | git pack-objects --stdout >pack_obj.tmp &&
 		size=$(wc -c <pack_obj.tmp) &&
-		dd if=pack_obj.tmp bs=1 count=$((size - 20 - 12)) skip=12 &&
+		dd if=pack_obj.tmp bs=1 count=$((size - $(test_oid rawsz) - 12)) skip=12 &&
 		rm -f pack_obj.tmp
 		return
 	fi
@@ -97,7 +113,8 @@ pack_obj () {
 
 # Compute and append pack trailer to "$1"
 pack_trailer () {
-	test-tool sha1 -b <"$1" >trailer.tmp &&
+	test_oid_init &&
+	test-tool $(test_oid algo) -b <"$1" >trailer.tmp &&
 	cat trailer.tmp >>"$1" &&
 	rm -f trailer.tmp
 }
@@ -108,3 +125,11 @@ pack_trailer () {
 clear_packs () {
 	rm -f .git/objects/pack/*
 }
+
+test_oid_cache <<-EOF
+packlib_7_0 sha1:01d7713666f4de822776c7622c10f1b07de280dc
+packlib_7_0 sha256:37c8e2c15bb22b912e59b43fd51a4f7e9465ed0b5084c5a1411d991cbe630683
+
+packlib_7_76 sha1:e68fe8129b546b101aee9510c5328e7f21ca1d18
+packlib_7_76 sha256:5d8e6fc40f2dab00e6983a48523fe57e621f46434cb58dbd4422fba03380d886
+EOF