[PATCH v5 1/5] t5323: test cases for git-pack-redundant

[Jiang Xin <worldhello.net@gmail.com>]

From: Jiang Xin <zhiyou.jx@alibaba-inc.com>

Add test cases for git pack-redundant to validate new algorithm for git
pack-redundant.

Signed-off-by: Jiang Xin <zhiyou.jx@alibaba-inc.com>
Reviewed-by: SZEDER Gábor <szeder.dev@gmail.com>
---
 t/t5323-pack-redundant.sh | 157 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 157 insertions(+)
 create mode 100755 t/t5323-pack-redundant.sh

diff --git a/t/t5323-pack-redundant.sh b/t/t5323-pack-redundant.sh
new file mode 100755
index 0000000000..7410426dee
--- /dev/null
+++ b/t/t5323-pack-redundant.sh
@@ -0,0 +1,157 @@
+#!/bin/sh
+#
+# Copyright (c) 2018 Jiang Xin
+#
+
+test_description='git pack-redundant test'
+
+. ./test-lib.sh
+
+create_commits()
+{
+	parent=
+	for name in A B C D E F G H I J K L M N O P Q R
+	do
+		test_tick &&
+		T=$(git write-tree) &&
+		if test -z "$parent"
+		then
+			oid=$(echo $name | git commit-tree $T)
+		else
+			oid=$(echo $name | git commit-tree -p $parent $T)
+		fi &&
+		eval $name=$oid &&
+		parent=$oid ||
+		return 1
+	done
+	git update-ref refs/heads/master $M
+}
+
+create_pack_1()
+{
+	P1=$(cd .git/objects/pack; printf "$T\n$A\n$B\n$C\n$D\n$E\n$F\n$R\n" | git pack-objects pack 2>/dev/null) &&
+	eval P$P1=P1:$P1
+}
+
+create_pack_2()
+{
+	P2=$(cd .git/objects/pack; printf "$B\n$C\n$D\n$E\n$G\n$H\n$I\n" | git pack-objects pack 2>/dev/null) &&
+	eval P$P2=P2:$P2
+}
+
+create_pack_3()
+{
+	P3=$(cd .git/objects/pack; printf "$F\n$I\n$J\n$K\n$L\n$M\n" | git pack-objects pack 2>/dev/null) &&
+	eval P$P3=P3:$P3
+}
+
+create_pack_4()
+{
+	P4=$(cd .git/objects/pack; printf "$J\n$K\n$L\n$M\n$P\n" | git pack-objects pack 2>/dev/null) &&
+	eval P$P4=P4:$P4
+}
+
+create_pack_5()
+{
+	P5=$(cd .git/objects/pack; printf "$G\n$H\n$N\n$O\n" | git pack-objects pack 2>/dev/null) &&
+	eval P$P5=P5:$P5
+}
+
+create_pack_6()
+{
+	P6=$(cd .git/objects/pack; printf "$N\n$O\n$Q\n" | git pack-objects pack 2>/dev/null) &&
+	eval P$P6=P6:$P6
+}
+
+create_pack_7()
+{
+	P7=$(cd .git/objects/pack; printf "$P\n$Q\n" | git pack-objects pack 2>/dev/null) &&
+	eval P$P7=P7:$P7
+}
+
+create_pack_8()
+{
+	P8=$(cd .git/objects/pack; printf "$A\n" | git pack-objects pack 2>/dev/null) &&
+	eval P$P8=P8:$P8
+}
+
+test_expect_success 'setup' '
+	create_commits
+'
+
+test_expect_success 'no redundant packs' '
+	create_pack_1 && create_pack_2 && create_pack_3 &&
+	git pack-redundant --all >out &&
+	test_must_be_empty out
+'
+
+test_expect_success 'create pack 4, 5' '
+	create_pack_4 && create_pack_5
+'
+
+cat >expected <<EOF
+P2:$P2
+EOF
+
+test_expect_success 'one of pack-2/pack-3 is redundant' '
+	git pack-redundant --all >out &&
+	sed -E -e "s#.*/pack-(.*)\.(idx|pack)#\1#" out | \
+		sort -u | \
+		while read p; do eval echo "\${P$p}"; done | \
+		sort >actual && \
+	test_cmp expected actual
+'
+
+test_expect_success 'create pack 6, 7' '
+	create_pack_6 && create_pack_7
+'
+
+cat >expected <<EOF
+P2:$P2
+P4:$P4
+P6:$P6
+EOF
+
+test_expect_success 'pack 2, 4, and 6 are redundant' '
+	git pack-redundant --all >out &&
+	sed -E -e "s#.*/pack-(.*)\.(idx|pack)#\1#" out | \
+		sort -u | \
+		while read p; do eval echo "\${P$p}"; done | \
+		sort >actual && \
+	test_cmp expected actual
+'
+
+test_expect_success 'create pack 8' '
+	create_pack_8
+'
+
+cat >expected <<EOF
+P2:$P2
+P4:$P4
+P6:$P6
+P8:$P8
+EOF
+
+test_expect_success 'pack-8, subset of pack-1, is also redundant' '
+	git pack-redundant --all >out &&
+	sed -E -e "s#.*/pack-(.*)\.(idx|pack)#\1#" out | \
+		sort -u | \
+		while read p; do eval echo "\${P$p}"; done | \
+		sort >actual && \
+	test_cmp expected actual
+'
+
+test_expect_success 'clear loose objects' '
+	git prune-packed &&
+	find .git/objects -type f | sed -e "/objects\/pack\//d" >out &&
+	test_must_be_empty out
+'
+
+test_expect_success 'remove redundant packs' '
+	git pack-redundant --all | xargs rm &&
+	git fsck &&
+	git pack-redundant --all >out &&
+	test_must_be_empty out
+'
+
+test_done
-- 
2.20.1.101.gc01fadde4e