Fix #31 and add new test case to reproduce it.

tests/xbps/libxbps/common/Kyuafile

@@ -11,6 +11,7 @@ atf_test_program{name="find_pkg_obsoletes_test"}
 atf_test_program{name="issue6_test"}
 atf_test_program{name="issue18_test"}
 atf_test_program{name="issue20_test"}
+atf_test_program{name="issue31_test"}
 atf_test_program{name="conf_files_test"}
 atf_test_program{name="remove_test"}
 atf_test_program{name="replace_test"}

tests/xbps/libxbps/shell/Makefile

@@ -3,6 +3,7 @@ TOPDIR = ../../../..
 
 TESTSHELL = conf_files_test issue6_test issue18_test issue20_test remove_test
 TESTSHELL+= replace_test installmode_test obsoletefiles_test
+TESTSHELL+= issue31_test
 
 include ../Makefile.inc
 include $(TOPDIR)/mk/test.mk

tests/xbps/libxbps/shell/issue31_test.sh

@@ -0,0 +1,42 @@
+#! /usr/bin/env atf-sh
+
+# xbps issue #31.
+# How to reproduce it:
+# 	Generate pkg A-0.1_1:
+#		/dir/dir/foo
+#	Install pkg A.
+#	Generate pkg A-0.2_1:
+#		/dir/foo
+#	Update pkg A to 0.2_1
+
+atf_test_case issue31
+
+issue31_head() {
+	atf_set "descr" "xbps issue #31 (https://github.com/xtraeme/xbps/issues/31)"
+}
+
+issue31_body() {
+	mkdir -p pkg_A/usr/share/licenses/chromium/license.html
+	echo random > pkg_A/usr/share/licenses/chromium/license.html/eula.html
+	xbps-create -A noarch -n A-0.1_1 -s "pkg A" pkg_A
+	atf_check_equal $? 0
+	xbps-rindex -a *.xbps
+	atf_check_equal $? 0
+
+	xbps-install -r root -C null.conf --repository=$PWD -y A
+	atf_check_equal $? 0
+
+	mkdir -p pkg_B/usr/share/licenses/chromium
+	echo "morerandom" > pkg_B/usr/share/licenses/chromium/license.html
+	xbps-create -A noarch -n A-0.2_1 -s "pkg A" pkg_B
+	atf_check_equal $? 0
+	xbps-rindex -a A-0.2_1.noarch.xbps
+	atf_check_equal $? 0
+
+	xbps-install -r root -C null.conf --repository=$PWD -yuvd A
+	atf_check_equal $? 0
+}
+
+atf_init_test_cases() {
+	atf_add_test_case issue31
+}