Class: RemoteCommandHandler
- Inherits:
-
Object
- Object
- RemoteCommandHandler
- Defined in:
- lib/help/remote_command_handler.rb
Overview
Provides methods to be executed via ssh to remote instances.
Direct Known Subclasses
Instance Attribute Summary collapse
-
#logger ⇒ Object
Returns the value of attribute logger.
-
#ssh_session ⇒ Object
Returns the value of attribute ssh_session.
-
#use_sudo ⇒ Object
Returns the value of attribute use_sudo.
Instance Method Summary collapse
-
#connect(ip, user, key_data, timeout = 30) ⇒ Object
Connect to the machine as root using keydata from a keyfile.
-
#connect_with_keyfile(ip, user_name, keyfile, timeout = 30) ⇒ Object
Connect to the machine as root using a keyfile.
- #create_filesystem(fs_type, volume) ⇒ Object
-
#disconnect ⇒ Object
Disconnect the current handler.
-
#drive_mounted?(path) ⇒ Boolean
Checks if the drive on path is mounted.
-
#drive_mounted_as?(device, path) ⇒ Boolean
Checks if the drive on path is mounted with the specific device.
- #echo(data, file) ⇒ Object
-
#file_exists?(path) ⇒ Boolean
Check if the path/file specified exists.
-
#get_output(exec_string, push_data = nil, stdout = [], stderr = []) ⇒ Object
Executes the specified #exec_string on a remote session specified as #ssh_session.
-
#initialize ⇒ RemoteCommandHandler
constructor
A new instance of RemoteCommandHandler.
-
#install(software_package) ⇒ Object
Installs the software package specified.
-
#local_rcopy(source_path, dest_path, exclude_path = nil) ⇒ Object
Copy directory using basic cp exclude_path: a space separated list of directory.
-
#local_rsync(source_path, dest_path, exclude_path = nil) ⇒ Object
Copy directory using options -avHx.
- #mkdir(path) ⇒ Object
- #mount(device, path) ⇒ Object
-
#remote_execute(exec_string, push_data = nil, raise_exception = false) ⇒ Object
Executes the specified #exec_string on a remote session specified.
-
#remote_rsync(keyfile, source_path, dest_ip, dest_path) ⇒ Object
Copy directory via an ssh-tunnel.
-
#retrieve_os ⇒ Object
Returns the result of uname -a (Linux).
-
#scp(keyfile, source_path, dest_ip, dest_path) ⇒ Object
Copy directory via an ssh-tunnel.
-
#stdout_contains?(exec_string, search_string = "", push_data = nil) ⇒ Boolean
Executes the specified #exec_string on a remote session specified as #ssh_session and logs the command-output into the specified #logger.
-
#tools_installed?(software_package) ⇒ Boolean
Checks if the software package specified is installed.
-
#umount(path) ⇒ Object
Unmount the specified path.
- #upload(ip, user, key_data, local_file, destination_file, timeout = 60) ⇒ Object
-
#zip(source_path, destination_file) ⇒ Object
Zip the complete contents of the source path into the destination file.
Constructor Details
#initialize ⇒ RemoteCommandHandler
Returns a new instance of RemoteCommandHandler.
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# File 'lib/help/remote_command_handler.rb', line 9 def initialize() @logger = Logger.new(STDOUT) @use_sudo = false end |
Instance Attribute Details
#logger ⇒ Object
Returns the value of attribute logger.
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# File 'lib/help/remote_command_handler.rb', line 8 def logger @logger end |
#ssh_session ⇒ Object
Returns the value of attribute ssh_session.
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# File 'lib/help/remote_command_handler.rb', line 8 def ssh_session @ssh_session end |
#use_sudo ⇒ Object
Returns the value of attribute use_sudo.
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# File 'lib/help/remote_command_handler.rb', line 8 def use_sudo @use_sudo end |
Instance Method Details
#connect(ip, user, key_data, timeout = 30) ⇒ Object
Connect to the machine as root using keydata from a keyfile. Params:
-
ip: ip address of the machine to connect to
-
user: user name
-
key_data: key_data to be used for authentication
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# File 'lib/help/remote_command_handler.rb', line 29 def connect(ip, user, key_data, timeout = 30) @use_sudo = false @ssh_session = Net::SSH.start(ip, user, {:key_data => [key_data], :timeout => timeout}) @use_sudo = true unless user.strip == 'root' end |
#connect_with_keyfile(ip, user_name, keyfile, timeout = 30) ⇒ Object
Connect to the machine as root using a keyfile. Params:
-
ip: ip address of the machine to connect to
-
keyfile: path of the keyfile to be used for authentication
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# File 'lib/help/remote_command_handler.rb', line 18 def connect_with_keyfile(ip, user_name, keyfile, timeout = 30) @use_sudo = false @ssh_session = Net::SSH.start(ip, user_name, {:keys => [keyfile], :timeout => timeout}) @use_sudo = true unless user_name.strip == 'root' end |
#create_filesystem(fs_type, volume) ⇒ Object
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# File 'lib/help/remote_command_handler.rb', line 71 def create_filesystem(fs_type, volume) e = "mkfs -t #{fs_type} #{volume}" remote_execute(e, "y") #TODO: quiet mode? end |
#disconnect ⇒ Object
Disconnect the current handler
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# File 'lib/help/remote_command_handler.rb', line 36 def disconnect @ssh_session.close end |
#drive_mounted?(path) ⇒ Boolean
Checks if the drive on path is mounted
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# File 'lib/help/remote_command_handler.rb', line 87 def drive_mounted?(path) #check if drive mounted drive_found = stdout_contains?("mount", "on #{path} type") if drive_found return file_exists?(path) else @logger.debug "not mounted (since #{path} non-existing)" false end end |
#drive_mounted_as?(device, path) ⇒ Boolean
Checks if the drive on path is mounted with the specific device
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# File 'lib/help/remote_command_handler.rb', line 99 def drive_mounted_as?(device, path) #check if drive mounted stdout_contains?("mount", "#{device} on #{path} type") end |
#echo(data, file) ⇒ Object
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# File 'lib/help/remote_command_handler.rb', line 164 def echo(data, file) exec = "echo #{data} > #{file}" @logger.debug "going to execute #{exec}" remote_execute(exec, nil, true) if !file_exists?(file) raise Exception.new("file #{file} could not be created") end end |
#file_exists?(path) ⇒ Boolean
Check if the path/file specified exists
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# File 'lib/help/remote_command_handler.rb', line 41 def file_exists?(path) remote_execute("ls #{path}") end |
#get_output(exec_string, push_data = nil, stdout = [], stderr = []) ⇒ Object
Executes the specified #exec_string on a remote session specified as #ssh_session. When #push_data is specified, the data will be used as input for the command and thus allows to respond in advance to commands that ask the user something. It returns stdout. When #stdout or #stderr is specified as arrays, the respective output is also written into those arrays.
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# File 'lib/help/remote_command_handler.rb', line 212 def get_output(exec_string, push_data = nil, stdout = [], stderr = []) exec_string = "echo #{push_data} >tmp.txt; #{exec_string} <tmp.txt; rm -f tmp.txt" unless push_data == nil stdout = [] stderr = [] remote_exec_helper(exec_string, stdout, stderr) stdout.join() end |
#install(software_package) ⇒ Object
Installs the software package specified.
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# File 'lib/help/remote_command_handler.rb', line 51 def install(software_package) e = "yum -yq install #{software_package}" yum = remote_execute(e) if !yum @logger.info("yum installation failed; try apt-get") e = "apt-get -yq install #{software_package}" apt = remote_execute(e) @logger.info("apt=get installation? #{apt}") end end |
#local_rcopy(source_path, dest_path, exclude_path = nil) ⇒ Object
Copy directory using basic cp exclude_path: a space separated list of directory
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# File 'lib/help/remote_command_handler.rb', line 113 def local_rcopy(source_path, dest_path, exclude_path = nil) e = "" if exclude_path.nil? || exclude_path.empty? e = "cp -Rpv #{source_path} #{dest_path}" else # only one level of exclusion exclusion_regexp = exclude_path.gsub(' ', '|') e = "for dir in $(ls -d #{source_path}* | grep -E -v '#{exclusion_regexp}'); do cp -Rpv $dir #{dest_path}; done;" end @logger.debug "going to execute #{e}" remote_exec_helper(e, nil, nil, false) end |
#local_rsync(source_path, dest_path, exclude_path = nil) ⇒ Object
Copy directory using options -avHx
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# File 'lib/help/remote_command_handler.rb', line 127 def local_rsync(source_path, dest_path, exclude_path = nil) exclude = "" if exclude_path != nil exclude = "--exclude #{exclude_path}" end e = "rsync -avHx #{exclude} #{source_path} #{dest_path}" @logger.debug "going to execute #{e}" remote_exec_helper(e, nil, nil, false) #TODO: handle output in stderr? end |
#mkdir(path) ⇒ Object
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# File 'lib/help/remote_command_handler.rb', line 76 def mkdir(path) e = "mkdir #{path}" remote_execute(e, nil, true) end |
#mount(device, path) ⇒ Object
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# File 'lib/help/remote_command_handler.rb', line 81 def mount(device, path) e = "mount #{device} #{path}" remote_execute(e, nil, true) end |
#remote_execute(exec_string, push_data = nil, raise_exception = false) ⇒ Object
Executes the specified #exec_string on a remote session specified. When #push_data is specified, the data will be used as input for the command and thus allow to respond in advance to commands that ask the user something. The method will return true if nothing was written into stderr, otherwise false. When #raise_exception is set, an exception will be raised instead of returning false.
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# File 'lib/help/remote_command_handler.rb', line 180 def remote_execute(exec_string, push_data = nil, raise_exception = false) #XXX: command line: echo -e 'y' | mkfs -t ext3 /dev/sdf exec_string = "echo #{push_data} >tmp.txt; #{exec_string} <tmp.txt; rm -f tmp.txt" unless push_data == nil stdout = [] stderr = [] result = remote_exec_helper(exec_string, stdout, stderr) em = "RemoteCommandHandler: #{exec_string} lead to stderr message: #{stderr.join().strip}" @logger.info(em) unless stderr.size == 0 raise Exception.new(em) unless result == true || raise_exception == false result end |
#remote_rsync(keyfile, source_path, dest_ip, dest_path) ⇒ Object
Copy directory via an ssh-tunnel.
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# File 'lib/help/remote_command_handler.rb', line 138 def remote_rsync(keyfile, source_path, dest_ip, dest_path) e = "rsync -rlpgoDzq -e "+'"'+"ssh -o stricthostkeychecking=no -i #{keyfile}"+'"'+" #{source_path} root@#{dest_ip}:#{dest_path}" @logger.debug "going to execute #{e}" remote_exec_helper(e, nil, nil, false) #TODO: handle output in stderr? end |
#retrieve_os ⇒ Object
Returns the result of uname -a (Linux)
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# File 'lib/help/remote_command_handler.rb', line 46 def retrieve_os() get_output("uname -r").strip end |
#scp(keyfile, source_path, dest_ip, dest_path) ⇒ Object
Copy directory via an ssh-tunnel.
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# File 'lib/help/remote_command_handler.rb', line 145 def scp(keyfile, source_path, dest_ip, dest_path) e = "scp -Cpqr -o stricthostkeychecking=no -i #{keyfile} #{source_path} root@#{dest_ip}:#{dest_path}" @logger.debug "going to execute #{e}" remote_exec_helper(e, nil, nil, false) #TODO: handle output in stderr? end |
#stdout_contains?(exec_string, search_string = "", push_data = nil) ⇒ Boolean
Executes the specified #exec_string on a remote session specified as #ssh_session and logs the command-output into the specified #logger. When #push_data is specified, the data will be used as input for the command and thus allows to respond in advance to commands that ask the user something. If the output in stdout contains the specified #search_string, the method returns true otherwise false. Output to stderr will be logged.
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# File 'lib/help/remote_command_handler.rb', line 198 def stdout_contains?(exec_string, search_string = "", push_data = nil) exec_string = "echo #{push_data} >tmp.txt; #{exec_string} <tmp.txt; rm -f tmp.txt" unless push_data == nil stdout = [] stderr = [] remote_exec_helper(exec_string, stdout, stderr) @logger.info("RemoteCommandHandler: #{exec_string} lead to stderr message: #{stderr.join().strip}") unless stderr.size == 0 stdout.join().include?(search_string) end |
#tools_installed?(software_package) ⇒ Boolean
Checks if the software package specified is installed.
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# File 'lib/help/remote_command_handler.rb', line 63 def tools_installed?(software_package) exec_string = "which #{software_package}" stdout = [] stderr = [] result = remote_exec_helper(exec_string, stdout, stderr) return result == true && stdout.size > 0 end |
#umount(path) ⇒ Object
Unmount the specified path.
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# File 'lib/help/remote_command_handler.rb', line 105 def umount(path) exec_string = "umount #{path}" remote_execute(exec_string) !drive_mounted?(path) end |
#upload(ip, user, key_data, local_file, destination_file, timeout = 60) ⇒ Object
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# File 'lib/help/remote_command_handler.rb', line 220 def upload(ip, user, key_data, local_file, destination_file, timeout = 60) Timeout::timeout(timeout) { Net::SCP.start(ip, user, {:key_data => [key_data], :timeout => timeout}) do |scp| scp.upload!(local_file, destination_file) end } end |
#zip(source_path, destination_file) ⇒ Object
Zip the complete contents of the source path into the destination file. Returns the an array with stderr output messages.
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# File 'lib/help/remote_command_handler.rb', line 153 def zip(source_path, destination_file) begin exec = "cd #{source_path}; zip -ryq #{destination_file} *" stderr = [] get_output(exec, nil, nil, stderr) return stderr rescue Exception => e raise Exception.new("zip failed due to #{e.}") end end |