Class: OsCtld::Container::Hooks::Base

Inherits:
Object
  • Object
show all
Includes:
OsCtl::Lib::Utils::Log
Defined in:
lib/osctld/container/hooks/base.rb

Class Attribute Summary collapse

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(ct, opts) ⇒ Base

Returns a new instance of Base.



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# File 'lib/osctld/container/hooks/base.rb', line 46

def initialize(ct, opts)
  @ct = ct
  @opts = opts
end

Class Attribute Details

.hook_name ⇒ Object (readonly)

Returns the value of attribute hook_name.



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# File 'lib/osctld/container/hooks/base.rb', line 6

def hook_name
  @hook_name
end

Instance Attribute Details

#ct ⇒ Container (readonly)

Returns:



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# File 'lib/osctld/container/hooks/base.rb', line 44

def ct
  @ct
end

#opts ⇒ Hash (readonly, protected)

Returns:

  • (Hash) 


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# File 'lib/osctld/container/hooks/base.rb', line 99

def opts
  @opts
end

Class Method Details

.blocking(v) ⇒ Object

Mark the hook as blocking or async, defaults to async

Parameters:

  • v (Boolean) —

    `true` for blocking, `false` for async



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# File 'lib/osctld/container/hooks/base.rb', line 17

def blocking(v)
  @blocking = v
end

.blocking? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/osctld/container/hooks/base.rb', line 21

def blocking?
  @blocking || false
end

.exist?(ct) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/osctld/container/hooks/base.rb', line 32

def exist?(ct)
  File.executable?(hook_path(ct))
end

.hook(name) ⇒ Object

Register hook unde a name

Parameters:

  • name (Symbol) 


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# File 'lib/osctld/container/hooks/base.rb', line 10

def hook(name)
  @hook_name = name
  Container::Hook.register(name, self)
end

.hook_path(ct) ⇒ Object 



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# File 'lib/osctld/container/hooks/base.rb', line 36

def hook_path(ct)
  File.join(ct.user_hook_script_dir, hook_name.to_s.gsub(/_/, '-'))
end

.run(ct, opts) ⇒ Object

Run hook



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# File 'lib/osctld/container/hooks/base.rb', line 26

def run(ct, opts)
  return unless exist?(ct)
  hook = new(ct, opts)
  hook.exec
end

Instance Method Details

#blocking? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/osctld/container/hooks/base.rb', line 89

def blocking?
  self.class.blocking?
end

#environment ⇒ Hash<String, String> (protected)

Override this method to define environment variables that the script hook will have set.

Returns:

  • (Hash<String, String>) 


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# File 'lib/osctld/container/hooks/base.rb', line 104

def environment
  {
    'OSCTL_HOOK_NAME' => self.class.hook_name.to_s,
    'OSCTL_POOL_NAME' => ct.pool.name,
    'OSCTL_CT_ID' => ct.id,
    'OSCTL_CT_USER' => ct.user.name,
    'OSCTL_CT_GROUP' => ct.group.name,
    'OSCTL_CT_DATASET' => ct.dataset.to_s,
    'OSCTL_CT_ROOTFS' => ct.rootfs,
    'OSCTL_CT_LXC_PATH' => ct.lxc_home,
    'OSCTL_CT_LXC_DIR' => ct.lxc_dir,
    'OSCTL_CT_CGROUP_PATH' => ct.cgroup_path,
    'OSCTL_CT_DISTRIBUTION' => ct.distribution,
    'OSCTL_CT_VERSION' => ct.version,
    'OSCTL_CT_HOSTNAME' => ct.hostname.to_s,
    'OSCTL_CT_LOG_FILE' => ct.log_path,
  }
end

#exec ⇒ Object

Execute the user script hook.

For blocking hooks, this method waits for the script hook to exit. If it exits with non-zero exit status, exception HookFailed is raised. Async hooks return immediately and their exit status has no meaning.



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# File 'lib/osctld/container/hooks/base.rb', line 56

def exec
  log(
    :info,
    ct,
    "Executing hook #{self.class.hook_name} at #{hook_path}"
  )

  env = environment

  pid = Process.fork do
    ENV.delete_if { |k,_| k != 'PATH' }
    env.each { |k, v| ENV[k] = v }

    Process.exec(*executable)
  end

  if blocking?
    Process.wait(pid)
    return true if $?.exitstatus == 0

    log(
      :warn,
      ct,
      "Hook #{self.class.hook_name} at #{hook_path} exited with #{$?.exitstatus}"
    )

    raise HookFailed.new(self, $?.exitstatus)

  else
    Container::Hook.watch(self, pid)
  end
end

#executable ⇒ Array<String> (protected)

Override this method to define the program and its arguments that will be execed to invoke the user script hook.

Returns:

  • (Array<String>) 


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# File 'lib/osctld/container/hooks/base.rb', line 126

def executable
  [hook_path]
end

#hook_path ⇒ Object 



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# File 'lib/osctld/container/hooks/base.rb', line 93

def hook_path
  self.class.hook_path(ct)
end