Fix reinstallation of pkgs in repolock mode.

At the time we've been searching for the pkg in a repo, no repos
were registered resulting in EINVAL. While here, if there's no
declared repos return ENOENT instead.

tests/xbps/libxbps/shell/update_repolock.sh

@@ -46,6 +46,36 @@ update_repolock_body() {
 	atf_check_equal "$out" "$(readlink -f repo2)"
 }
 
+atf_test_case reinstall_repolock
+
+reinstall_repolock_head() {
+	atf_set "descr" "Tests for pkg reinstall: pkg is in repository locked mode"
+}
+
+reinstall_repolock_body() {
+	mkdir -p repo pkg_A
+	cd repo
+	xbps-create -A noarch -n A-1.0_1 -s "A pkg" ../pkg_A
+	atf_check_equal $? 0
+	xbps-rindex -d -a $PWD/*.xbps
+	atf_check_equal $? 0
+	cd ..
+	# install A-1.0_1 from repository "repo"
+	xbps-install -r root --repository=repo -yvd A-1.0_1
+	atf_check_equal $? 0
+	# A-1.0_1 is now locked
+	xbps-pkgdb -r root -m repolock A
+	atf_check_equal $? 0
+	out=$(xbps-query -r root -p repository A)
+	atf_check_equal "$out" "$(readlink -f repo)"
+	# reinstall A-1.0_1 while repolocked
+	xbps-install -r root --repository=repo -yvfd A-1.0_1
+	atf_check_equal $? 0
+	out=$(xbps-query -r root -p pkgver A)
+	atf_check_equal $out A-1.0_1
+}
+
 atf_init_test_cases() {
 	atf_add_test_case update_repolock
+	atf_add_test_case reinstall_repolock
 }