check_file_age: support for --ignore-missing

Patch to provide for a -i | --ignore-missing option. This allows files that
don't exist to be monitored for without causing an error. The use case is:

* one process periodically pushes files to an "input" queue for a second
  process
* the second process, when running cleanly will "consume" (process and remove)
  these files

So the conditions to meet are:
1. If the file doesn't exist, that's fine (OK)
2. If the file exists, but is less than X seconds, that's fine (OK)
3. If the file exists, but greater than X seconds, no good (CRITICAL)

Since now check_file_age doesn't permit this behavior, as a non-existent file
is considered CRITICAL.

Test case was contributed by our lovely Holger.

Closes #1181, Closes #989, Closes #862, Closes #1187, Closes #845
Closes Debian Bug #496307

1 files changed, 6 insertions, 1 deletions

diff --git a/plugins-scripts/t/check_file_age.t b/plugins-scripts/t/check_file_age.t
index 384c276..a515649 100644
--- a/plugins-scripts/t/check_file_age.t
+++ b/plugins-scripts/t/check_file_age.t
@@ -5,7 +5,7 @@
 #
 
 use strict;
-use Test::More tests => 15;
+use Test::More tests => 16;
 use NPTest;
 
 my $successOutput = '/^FILE_AGE OK: /';
@@ -58,6 +58,11 @@ $result = NPTest->testCmd(
 cmp_ok( $result->return_code, '==', 0, "Checking file size" );
 
 $result = NPTest->testCmd(
+        "./check_file_age -f /non/existent --ignore-missing"
+        );
+cmp_ok( $result->return_code, '==', 0, "Honours --ignore-missing" );
+
+$result = NPTest->testCmd(
         "./check_file_age -f $temp_file -c 1000 -W 101"
         );
 cmp_ok( $result->return_code, '==', 1, "One byte too short" );