Allow to get ouput for multiple nodes at once

Signed-off-by: Kirill Shirinkin <fodojyko@gmail.com>

README.md

@@ -106,7 +106,11 @@ The `job output` command is used to view the output of Push jobs. (Push 2.0 and
 #### Syntax
 
 ```shell
-knife job output JOBID
+knife job output JOBID NODENAME1 NODENAME2
+```
+
+```shell
+knife job output JOBID -s SEARCH_QUERY
 ```
 
 #### Examples
@@ -115,12 +119,20 @@ knife job output JOBID
 knife job output 26e98ba162fa7ba6fb2793125553c7ae test --channel stdout
 ```
 
+```shell
+knife job output 26e98ba162fa7ba6fb2793125553c7ae -s "policy_group:staging" --channel stdout
+```
+
 #### Options
 
 --channel [stderr|stdout]
 
 The output channel to capture.
 
+--search QUERY
+
+Solr query for list of nodes that can have job output.
+
 ### job status
 
 The `job status` command is used to view the status of Push jobs.

lib/chef/knife/job_output.rb

@@ -15,26 +15,46 @@
 # under the License.
 #
 
+require "chef/knife/job_helpers"
+
 class Chef
   class Knife
     class JobOutput < Chef::Knife
+
+      include JobHelpers
+
       banner "knife job output <job id> <node> [<node> ...]"
 
       option :channel,
              :long => "--channel stdout|stderr",
              :default => "stdout",
              :description => "Which output channel to fetch (default stdout)."
 
+      option :search,
+            :short => "-s QUERY",
+            :long => "--search QUERY",
+            :required => false,
+            :description => "Solr query for list of nodes that can have job output."
+
       def run
         job_id = name_args[0]
         channel = get_channel(config[:channel])
-        node = name_args[1]
 
-        uri = "pushy/jobs/#{job_id}/output/#{node}/#{channel}"
+        node_names = process_search(config[:search], name_args[1, @name_args.length - 1])
+
+        node_names.each do |node|
+          uri = "pushy/jobs/#{job_id}/output/#{node}/#{channel}"
+          begin
+            job = rest.get_rest(uri, { "Accept" => "application/octet-stream" })
+            output(node: node, output: job)
+          rescue => e
+            if e.response.code == "404"
+              ui.warn("Could not find output for node #{node}, server returned 404")
+            end
+          end
 
-        job = rest.get_rest(uri, { "Accept" => "application/octet-stream" })
+        end
 
-        output(job)
       end
 
       def get_channel(channel)