uvol: unbreak if LVM is installed but unused

Fix and simplify console output, make sure uvol doesn't break in case
of LVM being installed but not used.

Signed-off-by: Daniel Golle <daniel@makrotopia.org>
(cherry picked from commit 3959a9b22c)

utils/uvol/files/lvm.uc

@@ -54,7 +54,7 @@ function pvs() {
 		return null;
 
 	let tmp = lvm("pvs", "-o", "vg_name", "-S", sprintf("\"pv_name=~^/dev/%s.*\$\"", rootdev));
-	if (tmp.report.pv)
+	if (tmp.report.pv[0])
 		return tmp.report.pv[0].vg_name;
 	else
 		return null;
@@ -115,8 +115,8 @@ function getdev(lv) {
 function lvm_init(ctx) {
 	cursor = ctx.cursor;
 	fs = ctx.fs;
-//	if (!fs.access(lvm_exec, "x"))
-//		return false;
+	if (type(fs.access) == "function" && !fs.access(lvm_exec, "x"))
+		return false;
 
 	vg_name = pvs();
 	if (!vg_name)

utils/uvol/files/uvol

@@ -23,7 +23,7 @@ commands:
   status volname		return status of volume
     return code: 0 - volume is ready for use
                  1 - volume is not ready for use
-                 2 - volume doesn'y exist
+                 2 - volume doesn't exist
   write volname size		write to volume from stdin, size in bytes
 ";
 
@@ -101,21 +101,19 @@ let legacy_output = function(var) {
 			out += "\n";
 		}
 	} else if (type(var) == "object") {
-		out += join(" ", values(line));
+		out += join(" ", values(var));
+		out += "\n";
+	} else if (type(var) == "string") {
+		out += var;
 		out += "\n";
 	}
 	return out;
 };
 
-if (type(backend[cmd]) == "string") {
-	printf("%s\n", backend[cmd]);
-} else if (type(backend[cmd]) == "function") {
+if (type(backend[cmd]) == "function") {
 	let ret = backend[cmd](...ARGV);
-	if (type(ret) == "int")
+	if (type(ret) == "int") {
 		exit(ret);
-
-	if (type(ret) == "string") {
-		printf("%s\n", ret);
 	} else {
 		if (json_output)
 			printf("%.J\n", ret);

utils/uvol/files/uvol.init

@@ -19,4 +19,3 @@ boot() {
 service_triggers() {
 	procd_add_raw_trigger "mount.ready" 200 /etc/init.d/uvol start
 }
-