Handle last possible PID failures

Opening the PID file can still fail separately, though this is unlikely

lib/AbstractException.php

@@ -104,8 +104,10 @@ abstract class AbstractException extends \Exception {
         "Rule/Exception.invalidPattern"               => 10701,
         "CLI/Exception.pidNotFile"                    => 10801,
         "CLI/Exception.pidDirNotFound"                => 10802,
-        "CLI/Exception.pidUnwritable"                 => 10803,
-        "CLI/Exception.pidUncreatable"                => 10804,
+        "CLI/Exception.pidUnusable"                   => 10803,
+        "CLI/Exception.pidUnreadable"                 => 10804,
+        "CLI/Exception.pidUnwritable"                 => 10805,
+        "CLI/Exception.pidUncreatable"                => 10806,
     ];
 
     protected $symbol;

lib/CLI.php

@@ -339,13 +339,17 @@ USAGE_TEXT;
         } elseif ($base = @realpath($dir)) {
             $out = "$base/$file";
             if (file_exists($out)) {
-                if (!is_writable($out)) {
-                    throw new \Exception("PID file is not writable");
+                if (!is_readable($out) && !is_writable($out)) {
+                    throw new CLI\Exception("pidUnusable", ['pidfile' => $out]);
+                } elseif (!is_readable($out)) {
+                    throw new CLI\Exception("pidunreadable", ['pidfile' => $out]);
+                } elseif (!is_writable($out)) {
+                    throw new CLI\Exception("pidUnwritable", ['pidfile' => $out]);
                 } elseif (!is_file($out)) {
                     throw new CLI\Exception("pidNotFile", ['pidfile' => $out]);
                 }
             } elseif (!is_writable($base)) {
-                throw new \Exception("Cannot create PID file");
+                throw new CLI\Exception("pidUncreatable", ['pidfile' => $out]);
             }
         } else {
             throw new \Exception("pidDirNotFound", ['piddir' => $dir]);

locale/en.php

@@ -210,6 +210,9 @@ return [
     'Exception.JKingWeb/Arsse/Rule/Exception.invalidPattern'               => 'Specified rule pattern is invalid',
     'Exception.JKingWeb/Arsse/CLI/Exception.pidNotFile'                    => 'Specified PID file location "{pidfile}" must be a regular file',
     'Exception.JKingWeb/Arsse/CLI/Exception.pidDirNotFound'                => 'Parent directory "{piddir}" of PID file does not exist',
+    'Exception.JKingWeb/Arsse/CLI/Exception.pidUnreadable'                 => 'Insufficient permissions to open PID file "{pidfile}" for reading',
     'Exception.JKingWeb/Arsse/CLI/Exception.pidUnwritable'                 => 'Insufficient permissions to open PID file "{pidfile}" for writing',
-    'Exception.JKingWeb/Arsse/CLI/Exception.pidNotFile'                    => 'Specified PID file location "{pidfile}" must be a regular file',
+    'Exception.JKingWeb/Arsse/CLI/Exception.pidUnusable'                   => 'Insufficient permissions to open PID file "{pidfile}" for reading or writing',
+    'Exception.JKingWeb/Arsse/CLI/Exception.pidUncreatable'                => 'Insufficient permissions to create PID file "{pidfile}"',
+    'Exception.JKingWeb/Arsse/CLI/Exception.pidNotFile'                    => 'PID file "{pidfile}" must be a regular file',
 ];