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          op: assign_op.Equal
          rhs: 
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              (command_sub
                left_token: <Id.Left_DollarParen '$('>
                command_list: 
                  (command.CommandList
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              )
            }
          spids: [10]
        )
      ]
    )
    (command.If
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        (if_arm
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            (command.Sentence
              child: 
                (command.DBracket
                  expr: 
                    (bool_expr.Binary
                      op_id: Id.BoolBinary_GlobDEqual
                      left: {($ Id.VSub_DollarName '$BOOTSTRAP_METHOD')}
                      right: {(DQ <vagrant>)}
                    )
                )
              terminator: <Id.Op_Semi _>
            )
          ]
          action: [
            (command.ShFunction
              name: do_on_node
              body: 
                (command.BraceGroup
                  children: [
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                      pairs: [
                        (assign_pair
                          lhs: (sh_lhs_expr.Name name:NODE)
                          op: assign_op.Equal
                          rhs: {($ Id.VSub_Number '$1')}
                          spids: [46]
                        )
                      ]
                    )
                    (C {<shift>})
                    (command.ShAssignment
                      pairs: [
                        (assign_pair
                          lhs: (sh_lhs_expr.Name name:COMMAND)
                          op: assign_op.Equal
                          rhs: {(DQ (${ Id.VSub_Star '*'))}
                          spids: [53]
                        )
                      ]
                    )
                    (C {<echo>} {(DQ <'EXECUTING on '> ($ Id.VSub_DollarName '$NODE'))})
                    (C {<vagrant>} {<ssh>} {($ Id.VSub_DollarName '$NODE')} {<-c>} 
                      {(DQ ($ Id.VSub_DollarName '$COMMAND'))}
                    )
                  ]
                )
            )
          ]
          spids: [20 35]
        )
      ]
      else_action: [(C {<Id.Lit_Other ':'>})]
    )
    (command.ShFunction
      name: check_for_envvars
      body: 
        (command.BraceGroup
          children: [
            (command.ShAssignment
              pairs: [
                (assign_pair
                  lhs: (sh_lhs_expr.Name name:FAILED_ENVVAR_CHECK)
                  op: assign_op.Equal
                  rhs: {<0>}
                  spids: [103]
                )
              ]
            )
            (command.ShAssignment
              pairs: [
                (assign_pair
                  lhs: (sh_lhs_expr.Name name:REQUIRED_VARS)
                  op: assign_op.Equal
                  rhs: {(DQ (${ Id.VSub_At '@'))}
                  spids: [107]
                )
              ]
            )
            (command.ForEach
              iter_name: ENVVAR
              iter_words: [
                {
                  (braced_var_sub
                    token: <Id.VSub_Name REQUIRED_VARS>
                    bracket_op: (bracket_op.WholeArray op_id:Id.Lit_At)
                  )
                }
              ]
              do_arg_iter: F
              body: 
                (command.DoGroup
                  children: [
                    (command.If
                      arms: [
                        (if_arm
                          cond: [
                            (command.Sentence
                              child: 
                                (command.DBracket
                                  expr: 
                                    (bool_expr.Unary
                                      op_id: Id.BoolUnary_z
                                      child: 
                                        {
                                          (braced_var_sub
                                            token: <Id.VSub_Name ENVVAR>
                                            prefix_op: (Id.VSub_Bang)
                                          )
                                        }
                                    )
                                )
                              terminator: <Id.Op_Semi _>
                            )
                          ]
                          action: [
                            (command.Simple
                              words: [
                                {<echo>}
                                {
                                  (DQ <'Environment variable '> ($ Id.VSub_DollarName '$ENVVAR') 
                                    <' must be set!'>
                                  )
                                }
                              ]
                              redirects: [
                                (redir.Redir
                                  op: <Id.Redir_GreatAnd '>&'>
                                  fd: -1
                                  arg_word: {<2>}
                                )
                              ]
                            )
                            (command.ShAssignment
                              pairs: [
                                (assign_pair
                                  lhs: (sh_lhs_expr.Name name:FAILED_ENVVAR_CHECK)
                                  op: assign_op.Equal
                                  rhs: {<1>}
                                  spids: [161]
                                )
                              ]
                            )
                          ]
                          spids: [132 146]
                        )
                      ]
                    )
                  ]
                )
            )
            (command.If
              arms: [
                (if_arm
                  cond: [
                    (command.Sentence
                      child: 
                        (command.DBracket
                          expr: 
                            (bool_expr.Binary
                              op_id: Id.BoolBinary_GlobNEqual
                              left: {($ Id.VSub_DollarName '$FAILED_ENVVAR_CHECK')}
                              right: {<0>}
                            )
                        )
                      terminator: <Id.Op_Semi _>
                    )
                  ]
                  action: [
                    (command.Sentence
                      child: (command.ControlFlow token:<Id.ControlFlow_Exit exit> arg_word:{<1>})
                      terminator: <Id.Op_Semi _>
                    )
                  ]
                  spids: [171 184]
                )
              ]
            )
          ]
        )
    )
    (command.ShFunction
      name: load_configs
      body: 
        (command.BraceGroup
          children: [
            (command.If
              arms: [
                (if_arm
                  cond: [
                    (command.Sentence
                      child: 
                        (command.DBracket
                          expr: 
                            (bool_expr.Unary
                              op_id: Id.BoolUnary_f
                              child: 
                                {
                                  (DQ ($ Id.VSub_DollarName '$REPO_ROOT') 
                                    </bootstrap/config/bootstrap_config.sh>
                                  )
                                }
                            )
                        )
                      terminator: <Id.Op_Semi _>
                    )
                  ]
                  action: [
                    (command.If
                      arms: [
                        (if_arm
                          cond: [
                            (command.Sentence
                              child: 
                                (command.DBracket
                                  expr: 
                                    (bool_expr.LogicalNot
                                      child: 
                                        (bool_expr.Unary
                                          op_id: Id.BoolUnary_f
                                          child: 
                                            {
                                              (DQ ($ Id.VSub_DollarName '$REPO_ROOT') 
                                                </bootstrap/config/bootstrap_config.sh.overrides>
                                              )
                                            }
                                        )
                                    )
                                )
                              terminator: <Id.Op_Semi _>
                            )
                          ]
                          action: [
                            (C {<echo>} 
                              {
                                (DQ 
                                  <
'Performing one-time move of bootstrap_config.sh to bootstrap_config.sh.overrides...'
                                  >
                                )
                              }
                            )
                            (C {<mv>} 
                              {($ Id.VSub_DollarName '$REPO_ROOT') 
                                </bootstrap/config/bootstrap_config.sh>
                              } {($ Id.VSub_DollarName '$REPO_ROOT') </bootstrap/config/bootstrap_config.sh.overrides>}
                            )
                          ]
                          spids: [231 247]
                        )
                      ]
                      else_action: [
                        (command.Simple
                          words: [
                            {<echo>}
                            {
                              (DQ 
                                <
'ERROR: both bootstrap_config.sh and bootstrap_config.sh.overrides exist!'
                                >
                              )
                            }
                          ]
                          redirects: [(redir.Redir op:<Id.Redir_GreatAnd '>&'> fd:-1 arg_word:{<2>})]
                        )
                        (command.Simple
                          words: [
                            {<echo>}
                            {
                              (DQ 
                                <
'Please move all overrides to bootstrap_config.sh.overrides and remove bootstrap_config.sh!'
                                >
                              )
                            }
                          ]
                          redirects: [(redir.Redir op:<Id.Redir_GreatAnd '>&'> fd:-1 arg_word:{<2>})]
                        )
                        (command.ControlFlow
                          token: <Id.ControlFlow_Exit exit>
                          arg_word: {<1>}
                        )
                      ]
                    )
                  ]
                  spids: [214 228]
                )
              ]
            )
            (command.ShAssignment
              pairs: [
                (assign_pair
                  lhs: (sh_lhs_expr.Name name:BOOTSTRAP_CONFIG_DEFAULTS)
                  op: assign_op.Equal
                  rhs: 
                    {
                      (DQ ($ Id.VSub_DollarName '$REPO_ROOT') 
                        </bootstrap/config/bootstrap_config.sh.defaults>
                      )
                    }
                  spids: [301]
                )
              ]
            )
            (command.ShAssignment
              pairs: [
                (assign_pair
                  lhs: (sh_lhs_expr.Name name:BOOTSTRAP_CONFIG_OVERRIDES)
                  op: assign_op.Equal
                  rhs: 
                    {
                      (DQ ($ Id.VSub_DollarName '$REPO_ROOT') 
                        </bootstrap/config/bootstrap_config.sh.overrides>
                      )
                    }
                  spids: [308]
                )
              ]
            )
            (command.If
              arms: [
                (if_arm
                  cond: [
                    (command.Sentence
                      child: 
                        (command.DBracket
                          expr: 
                            (bool_expr.LogicalNot
                              child: 
                                (bool_expr.Unary
                                  op_id: Id.BoolUnary_f
                                  child: {($ Id.VSub_DollarName '$BOOTSTRAP_CONFIG_DEFAULTS')}
                                )
                            )
                        )
                      terminator: <Id.Op_Semi _>
                    )
                  ]
                  action: [
                    (command.Simple
                      words: [
                        {<echo>}
                        {
                          (DQ 
                            <
'Bootstrap configuration defaults are missing! Your repository is corrupt; please restore '
                            > ($ Id.VSub_DollarName '$REPO_ROOT') </bootstrap/config/bootstrap_config.sh.defaults.>
                          )
                        }
                      ]
                      redirects: [(redir.Redir op:<Id.Redir_GreatAnd '>&'> fd:-1 arg_word:{<2>})]
                    )
                    (command.ControlFlow
                      token: <Id.ControlFlow_Exit exit>
                      arg_word: {<1>}
                    )
                  ]
                  spids: [315 328]
                )
              ]
            )
            (C {<source>} {($ Id.VSub_DollarName '$BOOTSTRAP_CONFIG_DEFAULTS')})
            (command.If
              arms: [
                (if_arm
                  cond: [
                    (command.Sentence
                      child: 
                        (command.DBracket
                          expr: 
                            (bool_expr.Unary
                              op_id: Id.BoolUnary_f
                              child: {($ Id.VSub_DollarName '$BOOTSTRAP_CONFIG_OVERRIDES')}
                            )
                        )
                      terminator: <Id.Op_Semi _>
                    )
                  ]
                  action: [
                    (command.Sentence
                      child: (C {<source>} {($ Id.VSub_DollarName '$BOOTSTRAP_CONFIG_OVERRIDES')})
                      terminator: <Id.Op_Semi _>
                    )
                  ]
                  spids: [356 367]
                )
              ]
            )
          ]
        )
    )
  ]
)