hostname input should probably strip/trim whitespace and possibly invalidate input with whitespace in it (which it may already do, didn't check yet)

Recently we had a case where an engineer copy/pasted a hostname string from some other source, pasted it in the host create window and there was a trailing whitespace (I believe a tab in this case).

This may be overly explicit but I'll paste some log snippets anyway:

Processing HostsController#create (for 10.0.9.9 at 2012-06-27 19:24:11) [POST]
  Parameters: {"commit"=>"Submit", "action"=>"create", "name"=>"Un-provisioned-777777 "}}
Add DNS PTR record for Un-provisioned-777777 .prod.example.net
Add DNS A record for Un-provisioned-777777 .prod.example.net/10.61.9.52
Create DHCP reservation for Un-provisioned-777777 .prod.example.net-00:11:22:33:44:55/10.61.9.52
Add the TFTP configuration for Un-provisioned-777777 .prod.example.net
Fetching required TFTP boot files for Un-provisioned-777777 .prod.example.net
Redirected to https://foreman.prod.example.net/hosts/Un-provisioned-777777%20.prod.example.net

Processing UnattendedController#provision (for 10.61.9.52 at 2012-06-27 19:29:55) [GET]
Found Un-provisioned-777777 .prod.example.net
Remove puppet certificate for Un-provisioned-777777 .prod.example.net
Failed to remove Un-provisioned-777777 .prod.example.net's puppet certificate: bad URI(is not URI?): http://admin-lv-1.prod.example.net:8443/puppet/ca/Un-provisioned-777777 .prod.example.net
Filter chain halted as [:handle_ca] rendered_or_redirected.
Completed in 8ms (View: 0, DB: 2) | 200 OK [http://foreman.prod.example.net/unattended/provision]

Processing HostsController#update (for 10.0.9.9 at 2012-06-27 21:13:50) [PUT]
  Parameters: {"commit"=>"Submit", "action"=>"update", "_method"=>"put", "authenticity_token"=>"R5YHORYKEC10DkTXd7tcK+G0ZvDiqbTUqCRo6MBX2wU=", "id"=>"Un-provisioned-777777 .prod.example.net", "controller"=>"hosts", "host"=>{"comment"=>"", "architecture_id"=>"1", "subnet_id"=>"12", "managed"=>"1", "puppetproxy_id"=>"2", "name"=>"Un-provisioned-777777", "sp_mac"=>"", "puppetmaster_name"=>"admin-lv-1.prod.example.net", "sp_name"=>"", "mac"=>"00:21:9b:a7:7e:a1", "domain_id"=>"2", "enabled"=>"1", "root_pass"=>"[FILTERED]", "medium_id"=>"6", "hostgroup_id"=>"26", "is_owned_by"=>"2-Users", "ptable_id"=>"14", "sp_subnet_id"=>"", "ip"=>"10.61.9.52", "environment_id"=>"23", "model_id"=>"", "disk"=>"", "sp_ip"=>"", "puppetclass_ids"=>[""], "operatingsystem_id"=>"19"}}
Delete the DNS PTR record for Un-provisioned-777777 .prod.example.net/10.61.9.52
Delete the DNS A record for Un-provisioned-777777 .prod.example.net/10.61.9.52
Remove DNS record for Un-provisioned-777777 .prod.example.net task failed with the following error: bad URI(is not URI?): http://admin-lv-1.prod.example.net:8443/dns/Un-provisioned-777777 .prod.example.net
Rolling back due to a problem: Remove DNS record for Un-provisioned-777777 .prod.example.net    1       failed  Un-provisioned-777777 .prod.example.netdel_dns_a_record
Add DNS PTR record for Un-provisioned-777777 .prod.example.net/10.61.9.52
Failed to save: Remove DNS record for Un-provisioned-777777 .prod.example.net task failed with the following error: bad URI(is not URI?): http://admin-lv-1.prod.example.net:8443/dns/Un-provisioned-777777 .prod.example.net
Rendering template within layouts/application
Rendering hosts/edit
Completed in 1342ms (View: 1058, DB: 16) | 200 OK [https://foreman.prod.example.net/hosts/Un-provisioned-777777%20.prod.example.net]

Processing HostsController#toggle_manage (for 10.0.9.9 at 2012-06-27 21:14:02) [PUT]
  Parameters: {"action"=>"toggle_manage", "_method"=>"put", "authenticity_token"=>"R5YHORYKEC10DkTXd7tcK+G0ZvDiqbTUqCRo6MBX2wU=", "id"=>"Un-provisioned-777777.prod.example.net", "controller"=>"hosts"}
Rendering template within layouts/application
Rendering common/404 (404)
Filter chain halted as [:find_by_name] rendered_or_redirected.
Completed in 28ms (View: 23, DB: 2) | 404 Not Found [https://foreman.prod.example.net/hosts/Un-provisioned-777777.prod.example.net/toggle_manage]

Eventually had to edit the dhcp leases file by hand.